This release fixes a number of security bugs and has minor new features and bug fixes. Security fixes, from the release notes (https://www.openssh.com/txt/release-9.3): This release contains fixes for a security problem and a memory safety problem. The memory safety problem is not believed to be exploitable, but we report most network-reachable memory faults as security bugs. * ssh-add(1): when adding smartcard keys to ssh-agent(1) with the per-hop destination constraints (ssh-add -h ...) added in OpenSSH 8.9, a logic error prevented the constraints from being communicated to the agent. This resulted in the keys being added without constraints. The common cases of non-smartcard keys and keys without destination constraints are unaffected. This problem was reported by Luci Stanescu. * ssh(1): Portable OpenSSH provides an implementation of the getrrsetbyname(3) function if the standard library does not provide it, for use by the VerifyHostKeyDNS feature. A specifically crafted DNS response could cause this function to perform an out-of-bounds read of adjacent stack data, but this condition does not appear to be exploitable beyond denial-of- service to the ssh(1) client. The getrrsetbyname(3) replacement is only included if the system's standard library lacks this function and portable OpenSSH was not compiled with the ldns library (--with-ldns). getrrsetbyname(3) is only invoked if using VerifyHostKeyDNS to fetch SSHFP records. This problem was found by the Coverity static analyzer. Sponsored by: The FreeBSD Foundation
2915 lines
62 KiB
C
2915 lines
62 KiB
C
/* $OpenBSD: misc.c,v 1.181 2023/03/03 02:37:58 dtucker Exp $ */
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/*
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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* Copyright (c) 2005-2020 Damien Miller. All rights reserved.
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* Copyright (c) 2004 Henning Brauer <henning@openbsd.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "includes.h"
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/wait.h>
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#include <sys/un.h>
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#include <limits.h>
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#ifdef HAVE_LIBGEN_H
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# include <libgen.h>
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#endif
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#ifdef HAVE_POLL_H
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#include <poll.h>
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#endif
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#ifdef HAVE_PATHS_H
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# include <paths.h>
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#include <pwd.h>
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#include <grp.h>
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#endif
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#ifdef SSH_TUN_OPENBSD
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#include <net/if.h>
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#endif
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#include "xmalloc.h"
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#include "misc.h"
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#include "log.h"
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#include "ssh.h"
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#include "sshbuf.h"
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#include "ssherr.h"
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#include "platform.h"
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/* remove newline at end of string */
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char *
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chop(char *s)
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{
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char *t = s;
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while (*t) {
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if (*t == '\n' || *t == '\r') {
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*t = '\0';
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return s;
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}
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t++;
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}
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return s;
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}
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/* remove whitespace from end of string */
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void
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rtrim(char *s)
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{
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size_t i;
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if ((i = strlen(s)) == 0)
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return;
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for (i--; i > 0; i--) {
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if (isspace((unsigned char)s[i]))
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s[i] = '\0';
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}
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}
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/* set/unset filedescriptor to non-blocking */
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int
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set_nonblock(int fd)
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{
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int val;
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val = fcntl(fd, F_GETFL);
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if (val == -1) {
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error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
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return (-1);
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}
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if (val & O_NONBLOCK) {
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debug3("fd %d is O_NONBLOCK", fd);
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return (0);
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}
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debug2("fd %d setting O_NONBLOCK", fd);
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val |= O_NONBLOCK;
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if (fcntl(fd, F_SETFL, val) == -1) {
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debug("fcntl(%d, F_SETFL, O_NONBLOCK): %s", fd,
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strerror(errno));
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return (-1);
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}
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return (0);
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}
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int
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unset_nonblock(int fd)
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{
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int val;
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val = fcntl(fd, F_GETFL);
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if (val == -1) {
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error("fcntl(%d, F_GETFL): %s", fd, strerror(errno));
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return (-1);
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}
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if (!(val & O_NONBLOCK)) {
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debug3("fd %d is not O_NONBLOCK", fd);
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return (0);
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}
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debug("fd %d clearing O_NONBLOCK", fd);
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val &= ~O_NONBLOCK;
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if (fcntl(fd, F_SETFL, val) == -1) {
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debug("fcntl(%d, F_SETFL, ~O_NONBLOCK): %s",
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fd, strerror(errno));
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return (-1);
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}
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return (0);
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}
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const char *
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ssh_gai_strerror(int gaierr)
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{
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if (gaierr == EAI_SYSTEM && errno != 0)
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return strerror(errno);
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return gai_strerror(gaierr);
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}
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/* disable nagle on socket */
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void
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set_nodelay(int fd)
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{
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int opt;
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socklen_t optlen;
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optlen = sizeof opt;
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if (getsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, &optlen) == -1) {
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debug("getsockopt TCP_NODELAY: %.100s", strerror(errno));
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return;
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}
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if (opt == 1) {
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debug2("fd %d is TCP_NODELAY", fd);
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return;
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}
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opt = 1;
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debug2("fd %d setting TCP_NODELAY", fd);
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if (setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof opt) == -1)
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error("setsockopt TCP_NODELAY: %.100s", strerror(errno));
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}
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/* Allow local port reuse in TIME_WAIT */
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int
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set_reuseaddr(int fd)
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{
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int on = 1;
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if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) == -1) {
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error("setsockopt SO_REUSEADDR fd %d: %s", fd, strerror(errno));
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return -1;
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}
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return 0;
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}
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/* Get/set routing domain */
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char *
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get_rdomain(int fd)
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{
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#if defined(HAVE_SYS_GET_RDOMAIN)
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return sys_get_rdomain(fd);
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#elif defined(__OpenBSD__)
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int rtable;
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char *ret;
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socklen_t len = sizeof(rtable);
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if (getsockopt(fd, SOL_SOCKET, SO_RTABLE, &rtable, &len) == -1) {
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error("Failed to get routing domain for fd %d: %s",
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fd, strerror(errno));
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return NULL;
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}
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xasprintf(&ret, "%d", rtable);
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return ret;
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#else /* defined(__OpenBSD__) */
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return NULL;
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#endif
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}
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int
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set_rdomain(int fd, const char *name)
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{
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#if defined(HAVE_SYS_SET_RDOMAIN)
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return sys_set_rdomain(fd, name);
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#elif defined(__OpenBSD__)
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int rtable;
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const char *errstr;
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if (name == NULL)
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return 0; /* default table */
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rtable = (int)strtonum(name, 0, 255, &errstr);
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if (errstr != NULL) {
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/* Shouldn't happen */
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error("Invalid routing domain \"%s\": %s", name, errstr);
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return -1;
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}
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if (setsockopt(fd, SOL_SOCKET, SO_RTABLE,
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&rtable, sizeof(rtable)) == -1) {
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error("Failed to set routing domain %d on fd %d: %s",
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rtable, fd, strerror(errno));
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return -1;
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}
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return 0;
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#else /* defined(__OpenBSD__) */
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error("Setting routing domain is not supported on this platform");
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return -1;
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#endif
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}
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int
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get_sock_af(int fd)
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{
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struct sockaddr_storage to;
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socklen_t tolen = sizeof(to);
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memset(&to, 0, sizeof(to));
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if (getsockname(fd, (struct sockaddr *)&to, &tolen) == -1)
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return -1;
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#ifdef IPV4_IN_IPV6
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if (to.ss_family == AF_INET6 &&
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IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&to)->sin6_addr))
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return AF_INET;
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#endif
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return to.ss_family;
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}
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void
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set_sock_tos(int fd, int tos)
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{
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#ifndef IP_TOS_IS_BROKEN
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int af;
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switch ((af = get_sock_af(fd))) {
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case -1:
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|
/* assume not a socket */
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break;
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case AF_INET:
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# ifdef IP_TOS
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debug3_f("set socket %d IP_TOS 0x%02x", fd, tos);
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if (setsockopt(fd, IPPROTO_IP, IP_TOS,
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&tos, sizeof(tos)) == -1) {
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error("setsockopt socket %d IP_TOS %d: %s",
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fd, tos, strerror(errno));
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}
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# endif /* IP_TOS */
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break;
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case AF_INET6:
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# ifdef IPV6_TCLASS
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debug3_f("set socket %d IPV6_TCLASS 0x%02x", fd, tos);
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if (setsockopt(fd, IPPROTO_IPV6, IPV6_TCLASS,
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&tos, sizeof(tos)) == -1) {
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error("setsockopt socket %d IPV6_TCLASS %d: %s",
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fd, tos, strerror(errno));
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}
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# endif /* IPV6_TCLASS */
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break;
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default:
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debug2_f("unsupported socket family %d", af);
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break;
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}
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#endif /* IP_TOS_IS_BROKEN */
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}
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|
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/*
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* Wait up to *timeoutp milliseconds for events on fd. Updates
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* *timeoutp with time remaining.
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* Returns 0 if fd ready or -1 on timeout or error (see errno).
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*/
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static int
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waitfd(int fd, int *timeoutp, short events)
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{
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struct pollfd pfd;
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struct timeval t_start;
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int oerrno, r;
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pfd.fd = fd;
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pfd.events = events;
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for (; *timeoutp >= 0;) {
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monotime_tv(&t_start);
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r = poll(&pfd, 1, *timeoutp);
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oerrno = errno;
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ms_subtract_diff(&t_start, timeoutp);
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errno = oerrno;
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if (r > 0)
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return 0;
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else if (r == -1 && errno != EAGAIN && errno != EINTR)
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return -1;
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else if (r == 0)
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break;
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}
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/* timeout */
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errno = ETIMEDOUT;
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return -1;
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}
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|
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/*
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* Wait up to *timeoutp milliseconds for fd to be readable. Updates
|
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* *timeoutp with time remaining.
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|
* Returns 0 if fd ready or -1 on timeout or error (see errno).
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*/
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int
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waitrfd(int fd, int *timeoutp) {
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return waitfd(fd, timeoutp, POLLIN);
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}
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|
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/*
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|
* Attempt a non-blocking connect(2) to the specified address, waiting up to
|
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* *timeoutp milliseconds for the connection to complete. If the timeout is
|
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* <=0, then wait indefinitely.
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*
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* Returns 0 on success or -1 on failure.
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*/
|
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int
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timeout_connect(int sockfd, const struct sockaddr *serv_addr,
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socklen_t addrlen, int *timeoutp)
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{
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int optval = 0;
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socklen_t optlen = sizeof(optval);
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/* No timeout: just do a blocking connect() */
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if (timeoutp == NULL || *timeoutp <= 0)
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return connect(sockfd, serv_addr, addrlen);
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set_nonblock(sockfd);
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for (;;) {
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if (connect(sockfd, serv_addr, addrlen) == 0) {
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/* Succeeded already? */
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unset_nonblock(sockfd);
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return 0;
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} else if (errno == EINTR)
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continue;
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else if (errno != EINPROGRESS)
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return -1;
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break;
|
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}
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if (waitfd(sockfd, timeoutp, POLLIN | POLLOUT) == -1)
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return -1;
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|
|
/* Completed or failed */
|
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if (getsockopt(sockfd, SOL_SOCKET, SO_ERROR, &optval, &optlen) == -1) {
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debug("getsockopt: %s", strerror(errno));
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return -1;
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}
|
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if (optval != 0) {
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errno = optval;
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return -1;
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}
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unset_nonblock(sockfd);
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return 0;
|
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}
|
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|
|
/* Characters considered whitespace in strsep calls. */
|
|
#define WHITESPACE " \t\r\n"
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#define QUOTE "\""
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|
|
/* return next token in configuration line */
|
|
static char *
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strdelim_internal(char **s, int split_equals)
|
|
{
|
|
char *old;
|
|
int wspace = 0;
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|
|
if (*s == NULL)
|
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return NULL;
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|
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old = *s;
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|
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*s = strpbrk(*s,
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split_equals ? WHITESPACE QUOTE "=" : WHITESPACE QUOTE);
|
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if (*s == NULL)
|
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return (old);
|
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|
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if (*s[0] == '\"') {
|
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memmove(*s, *s + 1, strlen(*s)); /* move nul too */
|
|
/* Find matching quote */
|
|
if ((*s = strpbrk(*s, QUOTE)) == NULL) {
|
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return (NULL); /* no matching quote */
|
|
} else {
|
|
*s[0] = '\0';
|
|
*s += strspn(*s + 1, WHITESPACE) + 1;
|
|
return (old);
|
|
}
|
|
}
|
|
|
|
/* Allow only one '=' to be skipped */
|
|
if (split_equals && *s[0] == '=')
|
|
wspace = 1;
|
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*s[0] = '\0';
|
|
|
|
/* Skip any extra whitespace after first token */
|
|
*s += strspn(*s + 1, WHITESPACE) + 1;
|
|
if (split_equals && *s[0] == '=' && !wspace)
|
|
*s += strspn(*s + 1, WHITESPACE) + 1;
|
|
|
|
return (old);
|
|
}
|
|
|
|
/*
|
|
* Return next token in configuration line; splts on whitespace or a
|
|
* single '=' character.
|
|
*/
|
|
char *
|
|
strdelim(char **s)
|
|
{
|
|
return strdelim_internal(s, 1);
|
|
}
|
|
|
|
/*
|
|
* Return next token in configuration line; splts on whitespace only.
|
|
*/
|
|
char *
|
|
strdelimw(char **s)
|
|
{
|
|
return strdelim_internal(s, 0);
|
|
}
|
|
|
|
struct passwd *
|
|
pwcopy(struct passwd *pw)
|
|
{
|
|
struct passwd *copy = xcalloc(1, sizeof(*copy));
|
|
|
|
copy->pw_name = xstrdup(pw->pw_name);
|
|
copy->pw_passwd = xstrdup(pw->pw_passwd == NULL ? "*" : pw->pw_passwd);
|
|
#ifdef HAVE_STRUCT_PASSWD_PW_GECOS
|
|
copy->pw_gecos = xstrdup(pw->pw_gecos);
|
|
#endif
|
|
copy->pw_uid = pw->pw_uid;
|
|
copy->pw_gid = pw->pw_gid;
|
|
#ifdef HAVE_STRUCT_PASSWD_PW_EXPIRE
|
|
copy->pw_expire = pw->pw_expire;
|
|
#endif
|
|
#ifdef HAVE_STRUCT_PASSWD_PW_CHANGE
|
|
copy->pw_change = pw->pw_change;
|
|
#endif
|
|
#ifdef HAVE_STRUCT_PASSWD_PW_CLASS
|
|
copy->pw_class = xstrdup(pw->pw_class);
|
|
#endif
|
|
copy->pw_dir = xstrdup(pw->pw_dir);
|
|
copy->pw_shell = xstrdup(pw->pw_shell);
|
|
return copy;
|
|
}
|
|
|
|
/*
|
|
* Convert ASCII string to TCP/IP port number.
|
|
* Port must be >=0 and <=65535.
|
|
* Return -1 if invalid.
|
|
*/
|
|
int
|
|
a2port(const char *s)
|
|
{
|
|
struct servent *se;
|
|
long long port;
|
|
const char *errstr;
|
|
|
|
port = strtonum(s, 0, 65535, &errstr);
|
|
if (errstr == NULL)
|
|
return (int)port;
|
|
if ((se = getservbyname(s, "tcp")) != NULL)
|
|
return ntohs(se->s_port);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
a2tun(const char *s, int *remote)
|
|
{
|
|
const char *errstr = NULL;
|
|
char *sp, *ep;
|
|
int tun;
|
|
|
|
if (remote != NULL) {
|
|
*remote = SSH_TUNID_ANY;
|
|
sp = xstrdup(s);
|
|
if ((ep = strchr(sp, ':')) == NULL) {
|
|
free(sp);
|
|
return (a2tun(s, NULL));
|
|
}
|
|
ep[0] = '\0'; ep++;
|
|
*remote = a2tun(ep, NULL);
|
|
tun = a2tun(sp, NULL);
|
|
free(sp);
|
|
return (*remote == SSH_TUNID_ERR ? *remote : tun);
|
|
}
|
|
|
|
if (strcasecmp(s, "any") == 0)
|
|
return (SSH_TUNID_ANY);
|
|
|
|
tun = strtonum(s, 0, SSH_TUNID_MAX, &errstr);
|
|
if (errstr != NULL)
|
|
return (SSH_TUNID_ERR);
|
|
|
|
return (tun);
|
|
}
|
|
|
|
#define SECONDS 1
|
|
#define MINUTES (SECONDS * 60)
|
|
#define HOURS (MINUTES * 60)
|
|
#define DAYS (HOURS * 24)
|
|
#define WEEKS (DAYS * 7)
|
|
|
|
/*
|
|
* Convert a time string into seconds; format is
|
|
* a sequence of:
|
|
* time[qualifier]
|
|
*
|
|
* Valid time qualifiers are:
|
|
* <none> seconds
|
|
* s|S seconds
|
|
* m|M minutes
|
|
* h|H hours
|
|
* d|D days
|
|
* w|W weeks
|
|
*
|
|
* Examples:
|
|
* 90m 90 minutes
|
|
* 1h30m 90 minutes
|
|
* 2d 2 days
|
|
* 1w 1 week
|
|
*
|
|
* Return -1 if time string is invalid.
|
|
*/
|
|
int
|
|
convtime(const char *s)
|
|
{
|
|
long total, secs, multiplier;
|
|
const char *p;
|
|
char *endp;
|
|
|
|
errno = 0;
|
|
total = 0;
|
|
p = s;
|
|
|
|
if (p == NULL || *p == '\0')
|
|
return -1;
|
|
|
|
while (*p) {
|
|
secs = strtol(p, &endp, 10);
|
|
if (p == endp ||
|
|
(errno == ERANGE && (secs == INT_MIN || secs == INT_MAX)) ||
|
|
secs < 0)
|
|
return -1;
|
|
|
|
multiplier = 1;
|
|
switch (*endp++) {
|
|
case '\0':
|
|
endp--;
|
|
break;
|
|
case 's':
|
|
case 'S':
|
|
break;
|
|
case 'm':
|
|
case 'M':
|
|
multiplier = MINUTES;
|
|
break;
|
|
case 'h':
|
|
case 'H':
|
|
multiplier = HOURS;
|
|
break;
|
|
case 'd':
|
|
case 'D':
|
|
multiplier = DAYS;
|
|
break;
|
|
case 'w':
|
|
case 'W':
|
|
multiplier = WEEKS;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
if (secs > INT_MAX / multiplier)
|
|
return -1;
|
|
secs *= multiplier;
|
|
if (total > INT_MAX - secs)
|
|
return -1;
|
|
total += secs;
|
|
if (total < 0)
|
|
return -1;
|
|
p = endp;
|
|
}
|
|
|
|
return total;
|
|
}
|
|
|
|
#define TF_BUFS 8
|
|
#define TF_LEN 9
|
|
|
|
const char *
|
|
fmt_timeframe(time_t t)
|
|
{
|
|
char *buf;
|
|
static char tfbuf[TF_BUFS][TF_LEN]; /* ring buffer */
|
|
static int idx = 0;
|
|
unsigned int sec, min, hrs, day;
|
|
unsigned long long week;
|
|
|
|
buf = tfbuf[idx++];
|
|
if (idx == TF_BUFS)
|
|
idx = 0;
|
|
|
|
week = t;
|
|
|
|
sec = week % 60;
|
|
week /= 60;
|
|
min = week % 60;
|
|
week /= 60;
|
|
hrs = week % 24;
|
|
week /= 24;
|
|
day = week % 7;
|
|
week /= 7;
|
|
|
|
if (week > 0)
|
|
snprintf(buf, TF_LEN, "%02lluw%01ud%02uh", week, day, hrs);
|
|
else if (day > 0)
|
|
snprintf(buf, TF_LEN, "%01ud%02uh%02um", day, hrs, min);
|
|
else
|
|
snprintf(buf, TF_LEN, "%02u:%02u:%02u", hrs, min, sec);
|
|
|
|
return (buf);
|
|
}
|
|
|
|
/*
|
|
* Returns a standardized host+port identifier string.
|
|
* Caller must free returned string.
|
|
*/
|
|
char *
|
|
put_host_port(const char *host, u_short port)
|
|
{
|
|
char *hoststr;
|
|
|
|
if (port == 0 || port == SSH_DEFAULT_PORT)
|
|
return(xstrdup(host));
|
|
if (asprintf(&hoststr, "[%s]:%d", host, (int)port) == -1)
|
|
fatal("put_host_port: asprintf: %s", strerror(errno));
|
|
debug3("put_host_port: %s", hoststr);
|
|
return hoststr;
|
|
}
|
|
|
|
/*
|
|
* Search for next delimiter between hostnames/addresses and ports.
|
|
* Argument may be modified (for termination).
|
|
* Returns *cp if parsing succeeds.
|
|
* *cp is set to the start of the next field, if one was found.
|
|
* The delimiter char, if present, is stored in delim.
|
|
* If this is the last field, *cp is set to NULL.
|
|
*/
|
|
char *
|
|
hpdelim2(char **cp, char *delim)
|
|
{
|
|
char *s, *old;
|
|
|
|
if (cp == NULL || *cp == NULL)
|
|
return NULL;
|
|
|
|
old = s = *cp;
|
|
if (*s == '[') {
|
|
if ((s = strchr(s, ']')) == NULL)
|
|
return NULL;
|
|
else
|
|
s++;
|
|
} else if ((s = strpbrk(s, ":/")) == NULL)
|
|
s = *cp + strlen(*cp); /* skip to end (see first case below) */
|
|
|
|
switch (*s) {
|
|
case '\0':
|
|
*cp = NULL; /* no more fields*/
|
|
break;
|
|
|
|
case ':':
|
|
case '/':
|
|
if (delim != NULL)
|
|
*delim = *s;
|
|
*s = '\0'; /* terminate */
|
|
*cp = s + 1;
|
|
break;
|
|
|
|
default:
|
|
return NULL;
|
|
}
|
|
|
|
return old;
|
|
}
|
|
|
|
/* The common case: only accept colon as delimiter. */
|
|
char *
|
|
hpdelim(char **cp)
|
|
{
|
|
char *r, delim = '\0';
|
|
|
|
r = hpdelim2(cp, &delim);
|
|
if (delim == '/')
|
|
return NULL;
|
|
return r;
|
|
}
|
|
|
|
char *
|
|
cleanhostname(char *host)
|
|
{
|
|
if (*host == '[' && host[strlen(host) - 1] == ']') {
|
|
host[strlen(host) - 1] = '\0';
|
|
return (host + 1);
|
|
} else
|
|
return host;
|
|
}
|
|
|
|
char *
|
|
colon(char *cp)
|
|
{
|
|
int flag = 0;
|
|
|
|
if (*cp == ':') /* Leading colon is part of file name. */
|
|
return NULL;
|
|
if (*cp == '[')
|
|
flag = 1;
|
|
|
|
for (; *cp; ++cp) {
|
|
if (*cp == '@' && *(cp+1) == '[')
|
|
flag = 1;
|
|
if (*cp == ']' && *(cp+1) == ':' && flag)
|
|
return (cp+1);
|
|
if (*cp == ':' && !flag)
|
|
return (cp);
|
|
if (*cp == '/')
|
|
return NULL;
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/*
|
|
* Parse a [user@]host:[path] string.
|
|
* Caller must free returned user, host and path.
|
|
* Any of the pointer return arguments may be NULL (useful for syntax checking).
|
|
* If user was not specified then *userp will be set to NULL.
|
|
* If host was not specified then *hostp will be set to NULL.
|
|
* If path was not specified then *pathp will be set to ".".
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
int
|
|
parse_user_host_path(const char *s, char **userp, char **hostp, char **pathp)
|
|
{
|
|
char *user = NULL, *host = NULL, *path = NULL;
|
|
char *sdup, *tmp;
|
|
int ret = -1;
|
|
|
|
if (userp != NULL)
|
|
*userp = NULL;
|
|
if (hostp != NULL)
|
|
*hostp = NULL;
|
|
if (pathp != NULL)
|
|
*pathp = NULL;
|
|
|
|
sdup = xstrdup(s);
|
|
|
|
/* Check for remote syntax: [user@]host:[path] */
|
|
if ((tmp = colon(sdup)) == NULL)
|
|
goto out;
|
|
|
|
/* Extract optional path */
|
|
*tmp++ = '\0';
|
|
if (*tmp == '\0')
|
|
tmp = ".";
|
|
path = xstrdup(tmp);
|
|
|
|
/* Extract optional user and mandatory host */
|
|
tmp = strrchr(sdup, '@');
|
|
if (tmp != NULL) {
|
|
*tmp++ = '\0';
|
|
host = xstrdup(cleanhostname(tmp));
|
|
if (*sdup != '\0')
|
|
user = xstrdup(sdup);
|
|
} else {
|
|
host = xstrdup(cleanhostname(sdup));
|
|
user = NULL;
|
|
}
|
|
|
|
/* Success */
|
|
if (userp != NULL) {
|
|
*userp = user;
|
|
user = NULL;
|
|
}
|
|
if (hostp != NULL) {
|
|
*hostp = host;
|
|
host = NULL;
|
|
}
|
|
if (pathp != NULL) {
|
|
*pathp = path;
|
|
path = NULL;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
free(sdup);
|
|
free(user);
|
|
free(host);
|
|
free(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Parse a [user@]host[:port] string.
|
|
* Caller must free returned user and host.
|
|
* Any of the pointer return arguments may be NULL (useful for syntax checking).
|
|
* If user was not specified then *userp will be set to NULL.
|
|
* If port was not specified then *portp will be -1.
|
|
* Returns 0 on success, -1 on failure.
|
|
*/
|
|
int
|
|
parse_user_host_port(const char *s, char **userp, char **hostp, int *portp)
|
|
{
|
|
char *sdup, *cp, *tmp;
|
|
char *user = NULL, *host = NULL;
|
|
int port = -1, ret = -1;
|
|
|
|
if (userp != NULL)
|
|
*userp = NULL;
|
|
if (hostp != NULL)
|
|
*hostp = NULL;
|
|
if (portp != NULL)
|
|
*portp = -1;
|
|
|
|
if ((sdup = tmp = strdup(s)) == NULL)
|
|
return -1;
|
|
/* Extract optional username */
|
|
if ((cp = strrchr(tmp, '@')) != NULL) {
|
|
*cp = '\0';
|
|
if (*tmp == '\0')
|
|
goto out;
|
|
if ((user = strdup(tmp)) == NULL)
|
|
goto out;
|
|
tmp = cp + 1;
|
|
}
|
|
/* Extract mandatory hostname */
|
|
if ((cp = hpdelim(&tmp)) == NULL || *cp == '\0')
|
|
goto out;
|
|
host = xstrdup(cleanhostname(cp));
|
|
/* Convert and verify optional port */
|
|
if (tmp != NULL && *tmp != '\0') {
|
|
if ((port = a2port(tmp)) <= 0)
|
|
goto out;
|
|
}
|
|
/* Success */
|
|
if (userp != NULL) {
|
|
*userp = user;
|
|
user = NULL;
|
|
}
|
|
if (hostp != NULL) {
|
|
*hostp = host;
|
|
host = NULL;
|
|
}
|
|
if (portp != NULL)
|
|
*portp = port;
|
|
ret = 0;
|
|
out:
|
|
free(sdup);
|
|
free(user);
|
|
free(host);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Converts a two-byte hex string to decimal.
|
|
* Returns the decimal value or -1 for invalid input.
|
|
*/
|
|
static int
|
|
hexchar(const char *s)
|
|
{
|
|
unsigned char result[2];
|
|
int i;
|
|
|
|
for (i = 0; i < 2; i++) {
|
|
if (s[i] >= '0' && s[i] <= '9')
|
|
result[i] = (unsigned char)(s[i] - '0');
|
|
else if (s[i] >= 'a' && s[i] <= 'f')
|
|
result[i] = (unsigned char)(s[i] - 'a') + 10;
|
|
else if (s[i] >= 'A' && s[i] <= 'F')
|
|
result[i] = (unsigned char)(s[i] - 'A') + 10;
|
|
else
|
|
return -1;
|
|
}
|
|
return (result[0] << 4) | result[1];
|
|
}
|
|
|
|
/*
|
|
* Decode an url-encoded string.
|
|
* Returns a newly allocated string on success or NULL on failure.
|
|
*/
|
|
static char *
|
|
urldecode(const char *src)
|
|
{
|
|
char *ret, *dst;
|
|
int ch;
|
|
|
|
ret = xmalloc(strlen(src) + 1);
|
|
for (dst = ret; *src != '\0'; src++) {
|
|
switch (*src) {
|
|
case '+':
|
|
*dst++ = ' ';
|
|
break;
|
|
case '%':
|
|
if (!isxdigit((unsigned char)src[1]) ||
|
|
!isxdigit((unsigned char)src[2]) ||
|
|
(ch = hexchar(src + 1)) == -1) {
|
|
free(ret);
|
|
return NULL;
|
|
}
|
|
*dst++ = ch;
|
|
src += 2;
|
|
break;
|
|
default:
|
|
*dst++ = *src;
|
|
break;
|
|
}
|
|
}
|
|
*dst = '\0';
|
|
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Parse an (scp|ssh|sftp)://[user@]host[:port][/path] URI.
|
|
* See https://tools.ietf.org/html/draft-ietf-secsh-scp-sftp-ssh-uri-04
|
|
* Either user or path may be url-encoded (but not host or port).
|
|
* Caller must free returned user, host and path.
|
|
* Any of the pointer return arguments may be NULL (useful for syntax checking)
|
|
* but the scheme must always be specified.
|
|
* If user was not specified then *userp will be set to NULL.
|
|
* If port was not specified then *portp will be -1.
|
|
* If path was not specified then *pathp will be set to NULL.
|
|
* Returns 0 on success, 1 if non-uri/wrong scheme, -1 on error/invalid uri.
|
|
*/
|
|
int
|
|
parse_uri(const char *scheme, const char *uri, char **userp, char **hostp,
|
|
int *portp, char **pathp)
|
|
{
|
|
char *uridup, *cp, *tmp, ch;
|
|
char *user = NULL, *host = NULL, *path = NULL;
|
|
int port = -1, ret = -1;
|
|
size_t len;
|
|
|
|
len = strlen(scheme);
|
|
if (strncmp(uri, scheme, len) != 0 || strncmp(uri + len, "://", 3) != 0)
|
|
return 1;
|
|
uri += len + 3;
|
|
|
|
if (userp != NULL)
|
|
*userp = NULL;
|
|
if (hostp != NULL)
|
|
*hostp = NULL;
|
|
if (portp != NULL)
|
|
*portp = -1;
|
|
if (pathp != NULL)
|
|
*pathp = NULL;
|
|
|
|
uridup = tmp = xstrdup(uri);
|
|
|
|
/* Extract optional ssh-info (username + connection params) */
|
|
if ((cp = strchr(tmp, '@')) != NULL) {
|
|
char *delim;
|
|
|
|
*cp = '\0';
|
|
/* Extract username and connection params */
|
|
if ((delim = strchr(tmp, ';')) != NULL) {
|
|
/* Just ignore connection params for now */
|
|
*delim = '\0';
|
|
}
|
|
if (*tmp == '\0') {
|
|
/* Empty username */
|
|
goto out;
|
|
}
|
|
if ((user = urldecode(tmp)) == NULL)
|
|
goto out;
|
|
tmp = cp + 1;
|
|
}
|
|
|
|
/* Extract mandatory hostname */
|
|
if ((cp = hpdelim2(&tmp, &ch)) == NULL || *cp == '\0')
|
|
goto out;
|
|
host = xstrdup(cleanhostname(cp));
|
|
if (!valid_domain(host, 0, NULL))
|
|
goto out;
|
|
|
|
if (tmp != NULL && *tmp != '\0') {
|
|
if (ch == ':') {
|
|
/* Convert and verify port. */
|
|
if ((cp = strchr(tmp, '/')) != NULL)
|
|
*cp = '\0';
|
|
if ((port = a2port(tmp)) <= 0)
|
|
goto out;
|
|
tmp = cp ? cp + 1 : NULL;
|
|
}
|
|
if (tmp != NULL && *tmp != '\0') {
|
|
/* Extract optional path */
|
|
if ((path = urldecode(tmp)) == NULL)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
/* Success */
|
|
if (userp != NULL) {
|
|
*userp = user;
|
|
user = NULL;
|
|
}
|
|
if (hostp != NULL) {
|
|
*hostp = host;
|
|
host = NULL;
|
|
}
|
|
if (portp != NULL)
|
|
*portp = port;
|
|
if (pathp != NULL) {
|
|
*pathp = path;
|
|
path = NULL;
|
|
}
|
|
ret = 0;
|
|
out:
|
|
free(uridup);
|
|
free(user);
|
|
free(host);
|
|
free(path);
|
|
return ret;
|
|
}
|
|
|
|
/* function to assist building execv() arguments */
|
|
void
|
|
addargs(arglist *args, char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *cp;
|
|
u_int nalloc;
|
|
int r;
|
|
|
|
va_start(ap, fmt);
|
|
r = vasprintf(&cp, fmt, ap);
|
|
va_end(ap);
|
|
if (r == -1)
|
|
fatal_f("argument too long");
|
|
|
|
nalloc = args->nalloc;
|
|
if (args->list == NULL) {
|
|
nalloc = 32;
|
|
args->num = 0;
|
|
} else if (args->num > (256 * 1024))
|
|
fatal_f("too many arguments");
|
|
else if (args->num >= args->nalloc)
|
|
fatal_f("arglist corrupt");
|
|
else if (args->num+2 >= nalloc)
|
|
nalloc *= 2;
|
|
|
|
args->list = xrecallocarray(args->list, args->nalloc,
|
|
nalloc, sizeof(char *));
|
|
args->nalloc = nalloc;
|
|
args->list[args->num++] = cp;
|
|
args->list[args->num] = NULL;
|
|
}
|
|
|
|
void
|
|
replacearg(arglist *args, u_int which, char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *cp;
|
|
int r;
|
|
|
|
va_start(ap, fmt);
|
|
r = vasprintf(&cp, fmt, ap);
|
|
va_end(ap);
|
|
if (r == -1)
|
|
fatal_f("argument too long");
|
|
if (args->list == NULL || args->num >= args->nalloc)
|
|
fatal_f("arglist corrupt");
|
|
|
|
if (which >= args->num)
|
|
fatal_f("tried to replace invalid arg %d >= %d",
|
|
which, args->num);
|
|
free(args->list[which]);
|
|
args->list[which] = cp;
|
|
}
|
|
|
|
void
|
|
freeargs(arglist *args)
|
|
{
|
|
u_int i;
|
|
|
|
if (args == NULL)
|
|
return;
|
|
if (args->list != NULL && args->num < args->nalloc) {
|
|
for (i = 0; i < args->num; i++)
|
|
free(args->list[i]);
|
|
free(args->list);
|
|
}
|
|
args->nalloc = args->num = 0;
|
|
args->list = NULL;
|
|
}
|
|
|
|
/*
|
|
* Expands tildes in the file name. Returns data allocated by xmalloc.
|
|
* Warning: this calls getpw*.
|
|
*/
|
|
int
|
|
tilde_expand(const char *filename, uid_t uid, char **retp)
|
|
{
|
|
char *ocopy = NULL, *copy, *s = NULL;
|
|
const char *path = NULL, *user = NULL;
|
|
struct passwd *pw;
|
|
size_t len;
|
|
int ret = -1, r, slash;
|
|
|
|
*retp = NULL;
|
|
if (*filename != '~') {
|
|
*retp = xstrdup(filename);
|
|
return 0;
|
|
}
|
|
ocopy = copy = xstrdup(filename + 1);
|
|
|
|
if (*copy == '\0') /* ~ */
|
|
path = NULL;
|
|
else if (*copy == '/') {
|
|
copy += strspn(copy, "/");
|
|
if (*copy == '\0')
|
|
path = NULL; /* ~/ */
|
|
else
|
|
path = copy; /* ~/path */
|
|
} else {
|
|
user = copy;
|
|
if ((path = strchr(copy, '/')) != NULL) {
|
|
copy[path - copy] = '\0';
|
|
path++;
|
|
path += strspn(path, "/");
|
|
if (*path == '\0') /* ~user/ */
|
|
path = NULL;
|
|
/* else ~user/path */
|
|
}
|
|
/* else ~user */
|
|
}
|
|
if (user != NULL) {
|
|
if ((pw = getpwnam(user)) == NULL) {
|
|
error_f("No such user %s", user);
|
|
goto out;
|
|
}
|
|
} else if ((pw = getpwuid(uid)) == NULL) {
|
|
error_f("No such uid %ld", (long)uid);
|
|
goto out;
|
|
}
|
|
|
|
/* Make sure directory has a trailing '/' */
|
|
slash = (len = strlen(pw->pw_dir)) == 0 || pw->pw_dir[len - 1] != '/';
|
|
|
|
if ((r = xasprintf(&s, "%s%s%s", pw->pw_dir,
|
|
slash ? "/" : "", path != NULL ? path : "")) <= 0) {
|
|
error_f("xasprintf failed");
|
|
goto out;
|
|
}
|
|
if (r >= PATH_MAX) {
|
|
error_f("Path too long");
|
|
goto out;
|
|
}
|
|
/* success */
|
|
ret = 0;
|
|
*retp = s;
|
|
s = NULL;
|
|
out:
|
|
free(s);
|
|
free(ocopy);
|
|
return ret;
|
|
}
|
|
|
|
char *
|
|
tilde_expand_filename(const char *filename, uid_t uid)
|
|
{
|
|
char *ret;
|
|
|
|
if (tilde_expand(filename, uid, &ret) != 0)
|
|
cleanup_exit(255);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Expand a string with a set of %[char] escapes and/or ${ENVIRONMENT}
|
|
* substitutions. A number of escapes may be specified as
|
|
* (char *escape_chars, char *replacement) pairs. The list must be terminated
|
|
* by a NULL escape_char. Returns replaced string in memory allocated by
|
|
* xmalloc which the caller must free.
|
|
*/
|
|
static char *
|
|
vdollar_percent_expand(int *parseerror, int dollar, int percent,
|
|
const char *string, va_list ap)
|
|
{
|
|
#define EXPAND_MAX_KEYS 16
|
|
u_int num_keys = 0, i;
|
|
struct {
|
|
const char *key;
|
|
const char *repl;
|
|
} keys[EXPAND_MAX_KEYS];
|
|
struct sshbuf *buf;
|
|
int r, missingvar = 0;
|
|
char *ret = NULL, *var, *varend, *val;
|
|
size_t len;
|
|
|
|
if ((buf = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
if (parseerror == NULL)
|
|
fatal_f("null parseerror arg");
|
|
*parseerror = 1;
|
|
|
|
/* Gather keys if we're doing percent expansion. */
|
|
if (percent) {
|
|
for (num_keys = 0; num_keys < EXPAND_MAX_KEYS; num_keys++) {
|
|
keys[num_keys].key = va_arg(ap, char *);
|
|
if (keys[num_keys].key == NULL)
|
|
break;
|
|
keys[num_keys].repl = va_arg(ap, char *);
|
|
if (keys[num_keys].repl == NULL) {
|
|
fatal_f("NULL replacement for token %s",
|
|
keys[num_keys].key);
|
|
}
|
|
}
|
|
if (num_keys == EXPAND_MAX_KEYS && va_arg(ap, char *) != NULL)
|
|
fatal_f("too many keys");
|
|
if (num_keys == 0)
|
|
fatal_f("percent expansion without token list");
|
|
}
|
|
|
|
/* Expand string */
|
|
for (i = 0; *string != '\0'; string++) {
|
|
/* Optionally process ${ENVIRONMENT} expansions. */
|
|
if (dollar && string[0] == '$' && string[1] == '{') {
|
|
string += 2; /* skip over '${' */
|
|
if ((varend = strchr(string, '}')) == NULL) {
|
|
error_f("environment variable '%s' missing "
|
|
"closing '}'", string);
|
|
goto out;
|
|
}
|
|
len = varend - string;
|
|
if (len == 0) {
|
|
error_f("zero-length environment variable");
|
|
goto out;
|
|
}
|
|
var = xmalloc(len + 1);
|
|
(void)strlcpy(var, string, len + 1);
|
|
if ((val = getenv(var)) == NULL) {
|
|
error_f("env var ${%s} has no value", var);
|
|
missingvar = 1;
|
|
} else {
|
|
debug3_f("expand ${%s} -> '%s'", var, val);
|
|
if ((r = sshbuf_put(buf, val, strlen(val))) !=0)
|
|
fatal_fr(r, "sshbuf_put ${}");
|
|
}
|
|
free(var);
|
|
string += len;
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* Process percent expansions if we have a list of TOKENs.
|
|
* If we're not doing percent expansion everything just gets
|
|
* appended here.
|
|
*/
|
|
if (*string != '%' || !percent) {
|
|
append:
|
|
if ((r = sshbuf_put_u8(buf, *string)) != 0)
|
|
fatal_fr(r, "sshbuf_put_u8 %%");
|
|
continue;
|
|
}
|
|
string++;
|
|
/* %% case */
|
|
if (*string == '%')
|
|
goto append;
|
|
if (*string == '\0') {
|
|
error_f("invalid format");
|
|
goto out;
|
|
}
|
|
for (i = 0; i < num_keys; i++) {
|
|
if (strchr(keys[i].key, *string) != NULL) {
|
|
if ((r = sshbuf_put(buf, keys[i].repl,
|
|
strlen(keys[i].repl))) != 0)
|
|
fatal_fr(r, "sshbuf_put %%-repl");
|
|
break;
|
|
}
|
|
}
|
|
if (i >= num_keys) {
|
|
error_f("unknown key %%%c", *string);
|
|
goto out;
|
|
}
|
|
}
|
|
if (!missingvar && (ret = sshbuf_dup_string(buf)) == NULL)
|
|
fatal_f("sshbuf_dup_string failed");
|
|
*parseerror = 0;
|
|
out:
|
|
sshbuf_free(buf);
|
|
return *parseerror ? NULL : ret;
|
|
#undef EXPAND_MAX_KEYS
|
|
}
|
|
|
|
/*
|
|
* Expand only environment variables.
|
|
* Note that although this function is variadic like the other similar
|
|
* functions, any such arguments will be unused.
|
|
*/
|
|
|
|
char *
|
|
dollar_expand(int *parseerr, const char *string, ...)
|
|
{
|
|
char *ret;
|
|
int err;
|
|
va_list ap;
|
|
|
|
va_start(ap, string);
|
|
ret = vdollar_percent_expand(&err, 1, 0, string, ap);
|
|
va_end(ap);
|
|
if (parseerr != NULL)
|
|
*parseerr = err;
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Returns expanded string or NULL if a specified environment variable is
|
|
* not defined, or calls fatal if the string is invalid.
|
|
*/
|
|
char *
|
|
percent_expand(const char *string, ...)
|
|
{
|
|
char *ret;
|
|
int err;
|
|
va_list ap;
|
|
|
|
va_start(ap, string);
|
|
ret = vdollar_percent_expand(&err, 0, 1, string, ap);
|
|
va_end(ap);
|
|
if (err)
|
|
fatal_f("failed");
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Returns expanded string or NULL if a specified environment variable is
|
|
* not defined, or calls fatal if the string is invalid.
|
|
*/
|
|
char *
|
|
percent_dollar_expand(const char *string, ...)
|
|
{
|
|
char *ret;
|
|
int err;
|
|
va_list ap;
|
|
|
|
va_start(ap, string);
|
|
ret = vdollar_percent_expand(&err, 1, 1, string, ap);
|
|
va_end(ap);
|
|
if (err)
|
|
fatal_f("failed");
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
tun_open(int tun, int mode, char **ifname)
|
|
{
|
|
#if defined(CUSTOM_SYS_TUN_OPEN)
|
|
return (sys_tun_open(tun, mode, ifname));
|
|
#elif defined(SSH_TUN_OPENBSD)
|
|
struct ifreq ifr;
|
|
char name[100];
|
|
int fd = -1, sock;
|
|
const char *tunbase = "tun";
|
|
|
|
if (ifname != NULL)
|
|
*ifname = NULL;
|
|
|
|
if (mode == SSH_TUNMODE_ETHERNET)
|
|
tunbase = "tap";
|
|
|
|
/* Open the tunnel device */
|
|
if (tun <= SSH_TUNID_MAX) {
|
|
snprintf(name, sizeof(name), "/dev/%s%d", tunbase, tun);
|
|
fd = open(name, O_RDWR);
|
|
} else if (tun == SSH_TUNID_ANY) {
|
|
for (tun = 100; tun >= 0; tun--) {
|
|
snprintf(name, sizeof(name), "/dev/%s%d",
|
|
tunbase, tun);
|
|
if ((fd = open(name, O_RDWR)) >= 0)
|
|
break;
|
|
}
|
|
} else {
|
|
debug_f("invalid tunnel %u", tun);
|
|
return -1;
|
|
}
|
|
|
|
if (fd == -1) {
|
|
debug_f("%s open: %s", name, strerror(errno));
|
|
return -1;
|
|
}
|
|
|
|
debug_f("%s mode %d fd %d", name, mode, fd);
|
|
|
|
/* Bring interface up if it is not already */
|
|
snprintf(ifr.ifr_name, sizeof(ifr.ifr_name), "%s%d", tunbase, tun);
|
|
if ((sock = socket(PF_UNIX, SOCK_STREAM, 0)) == -1)
|
|
goto failed;
|
|
|
|
if (ioctl(sock, SIOCGIFFLAGS, &ifr) == -1) {
|
|
debug_f("get interface %s flags: %s", ifr.ifr_name,
|
|
strerror(errno));
|
|
goto failed;
|
|
}
|
|
|
|
if (!(ifr.ifr_flags & IFF_UP)) {
|
|
ifr.ifr_flags |= IFF_UP;
|
|
if (ioctl(sock, SIOCSIFFLAGS, &ifr) == -1) {
|
|
debug_f("activate interface %s: %s", ifr.ifr_name,
|
|
strerror(errno));
|
|
goto failed;
|
|
}
|
|
}
|
|
|
|
if (ifname != NULL)
|
|
*ifname = xstrdup(ifr.ifr_name);
|
|
|
|
close(sock);
|
|
return fd;
|
|
|
|
failed:
|
|
if (fd >= 0)
|
|
close(fd);
|
|
if (sock >= 0)
|
|
close(sock);
|
|
return -1;
|
|
#else
|
|
error("Tunnel interfaces are not supported on this platform");
|
|
return (-1);
|
|
#endif
|
|
}
|
|
|
|
void
|
|
sanitise_stdfd(void)
|
|
{
|
|
int nullfd, dupfd;
|
|
|
|
if ((nullfd = dupfd = open(_PATH_DEVNULL, O_RDWR)) == -1) {
|
|
fprintf(stderr, "Couldn't open /dev/null: %s\n",
|
|
strerror(errno));
|
|
exit(1);
|
|
}
|
|
while (++dupfd <= STDERR_FILENO) {
|
|
/* Only populate closed fds. */
|
|
if (fcntl(dupfd, F_GETFL) == -1 && errno == EBADF) {
|
|
if (dup2(nullfd, dupfd) == -1) {
|
|
fprintf(stderr, "dup2: %s\n", strerror(errno));
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
if (nullfd > STDERR_FILENO)
|
|
close(nullfd);
|
|
}
|
|
|
|
char *
|
|
tohex(const void *vp, size_t l)
|
|
{
|
|
const u_char *p = (const u_char *)vp;
|
|
char b[3], *r;
|
|
size_t i, hl;
|
|
|
|
if (l > 65536)
|
|
return xstrdup("tohex: length > 65536");
|
|
|
|
hl = l * 2 + 1;
|
|
r = xcalloc(1, hl);
|
|
for (i = 0; i < l; i++) {
|
|
snprintf(b, sizeof(b), "%02x", p[i]);
|
|
strlcat(r, b, hl);
|
|
}
|
|
return (r);
|
|
}
|
|
|
|
/*
|
|
* Extend string *sp by the specified format. If *sp is not NULL (or empty),
|
|
* then the separator 'sep' will be prepended before the formatted arguments.
|
|
* Extended strings are heap allocated.
|
|
*/
|
|
void
|
|
xextendf(char **sp, const char *sep, const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
char *tmp1, *tmp2;
|
|
|
|
va_start(ap, fmt);
|
|
xvasprintf(&tmp1, fmt, ap);
|
|
va_end(ap);
|
|
|
|
if (*sp == NULL || **sp == '\0') {
|
|
free(*sp);
|
|
*sp = tmp1;
|
|
return;
|
|
}
|
|
xasprintf(&tmp2, "%s%s%s", *sp, sep == NULL ? "" : sep, tmp1);
|
|
free(tmp1);
|
|
free(*sp);
|
|
*sp = tmp2;
|
|
}
|
|
|
|
|
|
u_int64_t
|
|
get_u64(const void *vp)
|
|
{
|
|
const u_char *p = (const u_char *)vp;
|
|
u_int64_t v;
|
|
|
|
v = (u_int64_t)p[0] << 56;
|
|
v |= (u_int64_t)p[1] << 48;
|
|
v |= (u_int64_t)p[2] << 40;
|
|
v |= (u_int64_t)p[3] << 32;
|
|
v |= (u_int64_t)p[4] << 24;
|
|
v |= (u_int64_t)p[5] << 16;
|
|
v |= (u_int64_t)p[6] << 8;
|
|
v |= (u_int64_t)p[7];
|
|
|
|
return (v);
|
|
}
|
|
|
|
u_int32_t
|
|
get_u32(const void *vp)
|
|
{
|
|
const u_char *p = (const u_char *)vp;
|
|
u_int32_t v;
|
|
|
|
v = (u_int32_t)p[0] << 24;
|
|
v |= (u_int32_t)p[1] << 16;
|
|
v |= (u_int32_t)p[2] << 8;
|
|
v |= (u_int32_t)p[3];
|
|
|
|
return (v);
|
|
}
|
|
|
|
u_int32_t
|
|
get_u32_le(const void *vp)
|
|
{
|
|
const u_char *p = (const u_char *)vp;
|
|
u_int32_t v;
|
|
|
|
v = (u_int32_t)p[0];
|
|
v |= (u_int32_t)p[1] << 8;
|
|
v |= (u_int32_t)p[2] << 16;
|
|
v |= (u_int32_t)p[3] << 24;
|
|
|
|
return (v);
|
|
}
|
|
|
|
u_int16_t
|
|
get_u16(const void *vp)
|
|
{
|
|
const u_char *p = (const u_char *)vp;
|
|
u_int16_t v;
|
|
|
|
v = (u_int16_t)p[0] << 8;
|
|
v |= (u_int16_t)p[1];
|
|
|
|
return (v);
|
|
}
|
|
|
|
void
|
|
put_u64(void *vp, u_int64_t v)
|
|
{
|
|
u_char *p = (u_char *)vp;
|
|
|
|
p[0] = (u_char)(v >> 56) & 0xff;
|
|
p[1] = (u_char)(v >> 48) & 0xff;
|
|
p[2] = (u_char)(v >> 40) & 0xff;
|
|
p[3] = (u_char)(v >> 32) & 0xff;
|
|
p[4] = (u_char)(v >> 24) & 0xff;
|
|
p[5] = (u_char)(v >> 16) & 0xff;
|
|
p[6] = (u_char)(v >> 8) & 0xff;
|
|
p[7] = (u_char)v & 0xff;
|
|
}
|
|
|
|
void
|
|
put_u32(void *vp, u_int32_t v)
|
|
{
|
|
u_char *p = (u_char *)vp;
|
|
|
|
p[0] = (u_char)(v >> 24) & 0xff;
|
|
p[1] = (u_char)(v >> 16) & 0xff;
|
|
p[2] = (u_char)(v >> 8) & 0xff;
|
|
p[3] = (u_char)v & 0xff;
|
|
}
|
|
|
|
void
|
|
put_u32_le(void *vp, u_int32_t v)
|
|
{
|
|
u_char *p = (u_char *)vp;
|
|
|
|
p[0] = (u_char)v & 0xff;
|
|
p[1] = (u_char)(v >> 8) & 0xff;
|
|
p[2] = (u_char)(v >> 16) & 0xff;
|
|
p[3] = (u_char)(v >> 24) & 0xff;
|
|
}
|
|
|
|
void
|
|
put_u16(void *vp, u_int16_t v)
|
|
{
|
|
u_char *p = (u_char *)vp;
|
|
|
|
p[0] = (u_char)(v >> 8) & 0xff;
|
|
p[1] = (u_char)v & 0xff;
|
|
}
|
|
|
|
void
|
|
ms_subtract_diff(struct timeval *start, int *ms)
|
|
{
|
|
struct timeval diff, finish;
|
|
|
|
monotime_tv(&finish);
|
|
timersub(&finish, start, &diff);
|
|
*ms -= (diff.tv_sec * 1000) + (diff.tv_usec / 1000);
|
|
}
|
|
|
|
void
|
|
ms_to_timespec(struct timespec *ts, int ms)
|
|
{
|
|
if (ms < 0)
|
|
ms = 0;
|
|
ts->tv_sec = ms / 1000;
|
|
ts->tv_nsec = (ms % 1000) * 1000 * 1000;
|
|
}
|
|
|
|
void
|
|
monotime_ts(struct timespec *ts)
|
|
{
|
|
struct timeval tv;
|
|
#if defined(HAVE_CLOCK_GETTIME) && (defined(CLOCK_BOOTTIME) || \
|
|
defined(CLOCK_MONOTONIC) || defined(CLOCK_REALTIME))
|
|
static int gettime_failed = 0;
|
|
|
|
if (!gettime_failed) {
|
|
# ifdef CLOCK_BOOTTIME
|
|
if (clock_gettime(CLOCK_BOOTTIME, ts) == 0)
|
|
return;
|
|
# endif /* CLOCK_BOOTTIME */
|
|
# ifdef CLOCK_MONOTONIC
|
|
if (clock_gettime(CLOCK_MONOTONIC, ts) == 0)
|
|
return;
|
|
# endif /* CLOCK_MONOTONIC */
|
|
# ifdef CLOCK_REALTIME
|
|
/* Not monotonic, but we're almost out of options here. */
|
|
if (clock_gettime(CLOCK_REALTIME, ts) == 0)
|
|
return;
|
|
# endif /* CLOCK_REALTIME */
|
|
debug3("clock_gettime: %s", strerror(errno));
|
|
gettime_failed = 1;
|
|
}
|
|
#endif /* HAVE_CLOCK_GETTIME && (BOOTTIME || MONOTONIC || REALTIME) */
|
|
gettimeofday(&tv, NULL);
|
|
ts->tv_sec = tv.tv_sec;
|
|
ts->tv_nsec = (long)tv.tv_usec * 1000;
|
|
}
|
|
|
|
void
|
|
monotime_tv(struct timeval *tv)
|
|
{
|
|
struct timespec ts;
|
|
|
|
monotime_ts(&ts);
|
|
tv->tv_sec = ts.tv_sec;
|
|
tv->tv_usec = ts.tv_nsec / 1000;
|
|
}
|
|
|
|
time_t
|
|
monotime(void)
|
|
{
|
|
struct timespec ts;
|
|
|
|
monotime_ts(&ts);
|
|
return ts.tv_sec;
|
|
}
|
|
|
|
double
|
|
monotime_double(void)
|
|
{
|
|
struct timespec ts;
|
|
|
|
monotime_ts(&ts);
|
|
return ts.tv_sec + ((double)ts.tv_nsec / 1000000000);
|
|
}
|
|
|
|
void
|
|
bandwidth_limit_init(struct bwlimit *bw, u_int64_t kbps, size_t buflen)
|
|
{
|
|
bw->buflen = buflen;
|
|
bw->rate = kbps;
|
|
bw->thresh = buflen;
|
|
bw->lamt = 0;
|
|
timerclear(&bw->bwstart);
|
|
timerclear(&bw->bwend);
|
|
}
|
|
|
|
/* Callback from read/write loop to insert bandwidth-limiting delays */
|
|
void
|
|
bandwidth_limit(struct bwlimit *bw, size_t read_len)
|
|
{
|
|
u_int64_t waitlen;
|
|
struct timespec ts, rm;
|
|
|
|
bw->lamt += read_len;
|
|
if (!timerisset(&bw->bwstart)) {
|
|
monotime_tv(&bw->bwstart);
|
|
return;
|
|
}
|
|
if (bw->lamt < bw->thresh)
|
|
return;
|
|
|
|
monotime_tv(&bw->bwend);
|
|
timersub(&bw->bwend, &bw->bwstart, &bw->bwend);
|
|
if (!timerisset(&bw->bwend))
|
|
return;
|
|
|
|
bw->lamt *= 8;
|
|
waitlen = (double)1000000L * bw->lamt / bw->rate;
|
|
|
|
bw->bwstart.tv_sec = waitlen / 1000000L;
|
|
bw->bwstart.tv_usec = waitlen % 1000000L;
|
|
|
|
if (timercmp(&bw->bwstart, &bw->bwend, >)) {
|
|
timersub(&bw->bwstart, &bw->bwend, &bw->bwend);
|
|
|
|
/* Adjust the wait time */
|
|
if (bw->bwend.tv_sec) {
|
|
bw->thresh /= 2;
|
|
if (bw->thresh < bw->buflen / 4)
|
|
bw->thresh = bw->buflen / 4;
|
|
} else if (bw->bwend.tv_usec < 10000) {
|
|
bw->thresh *= 2;
|
|
if (bw->thresh > bw->buflen * 8)
|
|
bw->thresh = bw->buflen * 8;
|
|
}
|
|
|
|
TIMEVAL_TO_TIMESPEC(&bw->bwend, &ts);
|
|
while (nanosleep(&ts, &rm) == -1) {
|
|
if (errno != EINTR)
|
|
break;
|
|
ts = rm;
|
|
}
|
|
}
|
|
|
|
bw->lamt = 0;
|
|
monotime_tv(&bw->bwstart);
|
|
}
|
|
|
|
/* Make a template filename for mk[sd]temp() */
|
|
void
|
|
mktemp_proto(char *s, size_t len)
|
|
{
|
|
const char *tmpdir;
|
|
int r;
|
|
|
|
if ((tmpdir = getenv("TMPDIR")) != NULL) {
|
|
r = snprintf(s, len, "%s/ssh-XXXXXXXXXXXX", tmpdir);
|
|
if (r > 0 && (size_t)r < len)
|
|
return;
|
|
}
|
|
r = snprintf(s, len, "/tmp/ssh-XXXXXXXXXXXX");
|
|
if (r < 0 || (size_t)r >= len)
|
|
fatal_f("template string too short");
|
|
}
|
|
|
|
static const struct {
|
|
const char *name;
|
|
int value;
|
|
} ipqos[] = {
|
|
{ "none", INT_MAX }, /* can't use 0 here; that's CS0 */
|
|
{ "af11", IPTOS_DSCP_AF11 },
|
|
{ "af12", IPTOS_DSCP_AF12 },
|
|
{ "af13", IPTOS_DSCP_AF13 },
|
|
{ "af21", IPTOS_DSCP_AF21 },
|
|
{ "af22", IPTOS_DSCP_AF22 },
|
|
{ "af23", IPTOS_DSCP_AF23 },
|
|
{ "af31", IPTOS_DSCP_AF31 },
|
|
{ "af32", IPTOS_DSCP_AF32 },
|
|
{ "af33", IPTOS_DSCP_AF33 },
|
|
{ "af41", IPTOS_DSCP_AF41 },
|
|
{ "af42", IPTOS_DSCP_AF42 },
|
|
{ "af43", IPTOS_DSCP_AF43 },
|
|
{ "cs0", IPTOS_DSCP_CS0 },
|
|
{ "cs1", IPTOS_DSCP_CS1 },
|
|
{ "cs2", IPTOS_DSCP_CS2 },
|
|
{ "cs3", IPTOS_DSCP_CS3 },
|
|
{ "cs4", IPTOS_DSCP_CS4 },
|
|
{ "cs5", IPTOS_DSCP_CS5 },
|
|
{ "cs6", IPTOS_DSCP_CS6 },
|
|
{ "cs7", IPTOS_DSCP_CS7 },
|
|
{ "ef", IPTOS_DSCP_EF },
|
|
{ "le", IPTOS_DSCP_LE },
|
|
{ "lowdelay", IPTOS_LOWDELAY },
|
|
{ "throughput", IPTOS_THROUGHPUT },
|
|
{ "reliability", IPTOS_RELIABILITY },
|
|
{ NULL, -1 }
|
|
};
|
|
|
|
int
|
|
parse_ipqos(const char *cp)
|
|
{
|
|
u_int i;
|
|
char *ep;
|
|
long val;
|
|
|
|
if (cp == NULL)
|
|
return -1;
|
|
for (i = 0; ipqos[i].name != NULL; i++) {
|
|
if (strcasecmp(cp, ipqos[i].name) == 0)
|
|
return ipqos[i].value;
|
|
}
|
|
/* Try parsing as an integer */
|
|
val = strtol(cp, &ep, 0);
|
|
if (*cp == '\0' || *ep != '\0' || val < 0 || val > 255)
|
|
return -1;
|
|
return val;
|
|
}
|
|
|
|
const char *
|
|
iptos2str(int iptos)
|
|
{
|
|
int i;
|
|
static char iptos_str[sizeof "0xff"];
|
|
|
|
for (i = 0; ipqos[i].name != NULL; i++) {
|
|
if (ipqos[i].value == iptos)
|
|
return ipqos[i].name;
|
|
}
|
|
snprintf(iptos_str, sizeof iptos_str, "0x%02x", iptos);
|
|
return iptos_str;
|
|
}
|
|
|
|
void
|
|
lowercase(char *s)
|
|
{
|
|
for (; *s; s++)
|
|
*s = tolower((u_char)*s);
|
|
}
|
|
|
|
int
|
|
unix_listener(const char *path, int backlog, int unlink_first)
|
|
{
|
|
struct sockaddr_un sunaddr;
|
|
int saved_errno, sock;
|
|
|
|
memset(&sunaddr, 0, sizeof(sunaddr));
|
|
sunaddr.sun_family = AF_UNIX;
|
|
if (strlcpy(sunaddr.sun_path, path,
|
|
sizeof(sunaddr.sun_path)) >= sizeof(sunaddr.sun_path)) {
|
|
error_f("path \"%s\" too long for Unix domain socket", path);
|
|
errno = ENAMETOOLONG;
|
|
return -1;
|
|
}
|
|
|
|
sock = socket(PF_UNIX, SOCK_STREAM, 0);
|
|
if (sock == -1) {
|
|
saved_errno = errno;
|
|
error_f("socket: %.100s", strerror(errno));
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
if (unlink_first == 1) {
|
|
if (unlink(path) != 0 && errno != ENOENT)
|
|
error("unlink(%s): %.100s", path, strerror(errno));
|
|
}
|
|
if (bind(sock, (struct sockaddr *)&sunaddr, sizeof(sunaddr)) == -1) {
|
|
saved_errno = errno;
|
|
error_f("cannot bind to path %s: %s", path, strerror(errno));
|
|
close(sock);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
if (listen(sock, backlog) == -1) {
|
|
saved_errno = errno;
|
|
error_f("cannot listen on path %s: %s", path, strerror(errno));
|
|
close(sock);
|
|
unlink(path);
|
|
errno = saved_errno;
|
|
return -1;
|
|
}
|
|
return sock;
|
|
}
|
|
|
|
void
|
|
sock_set_v6only(int s)
|
|
{
|
|
#if defined(IPV6_V6ONLY) && !defined(__OpenBSD__)
|
|
int on = 1;
|
|
|
|
debug3("%s: set socket %d IPV6_V6ONLY", __func__, s);
|
|
if (setsockopt(s, IPPROTO_IPV6, IPV6_V6ONLY, &on, sizeof(on)) == -1)
|
|
error("setsockopt IPV6_V6ONLY: %s", strerror(errno));
|
|
#endif
|
|
}
|
|
|
|
/*
|
|
* Compares two strings that maybe be NULL. Returns non-zero if strings
|
|
* are both NULL or are identical, returns zero otherwise.
|
|
*/
|
|
static int
|
|
strcmp_maybe_null(const char *a, const char *b)
|
|
{
|
|
if ((a == NULL && b != NULL) || (a != NULL && b == NULL))
|
|
return 0;
|
|
if (a != NULL && strcmp(a, b) != 0)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Compare two forwards, returning non-zero if they are identical or
|
|
* zero otherwise.
|
|
*/
|
|
int
|
|
forward_equals(const struct Forward *a, const struct Forward *b)
|
|
{
|
|
if (strcmp_maybe_null(a->listen_host, b->listen_host) == 0)
|
|
return 0;
|
|
if (a->listen_port != b->listen_port)
|
|
return 0;
|
|
if (strcmp_maybe_null(a->listen_path, b->listen_path) == 0)
|
|
return 0;
|
|
if (strcmp_maybe_null(a->connect_host, b->connect_host) == 0)
|
|
return 0;
|
|
if (a->connect_port != b->connect_port)
|
|
return 0;
|
|
if (strcmp_maybe_null(a->connect_path, b->connect_path) == 0)
|
|
return 0;
|
|
/* allocated_port and handle are not checked */
|
|
return 1;
|
|
}
|
|
|
|
/* returns 1 if process is already daemonized, 0 otherwise */
|
|
int
|
|
daemonized(void)
|
|
{
|
|
int fd;
|
|
|
|
if ((fd = open(_PATH_TTY, O_RDONLY | O_NOCTTY)) >= 0) {
|
|
close(fd);
|
|
return 0; /* have controlling terminal */
|
|
}
|
|
if (getppid() != 1)
|
|
return 0; /* parent is not init */
|
|
if (getsid(0) != getpid())
|
|
return 0; /* not session leader */
|
|
debug3("already daemonized");
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Splits 's' into an argument vector. Handles quoted string and basic
|
|
* escape characters (\\, \", \'). Caller must free the argument vector
|
|
* and its members.
|
|
*/
|
|
int
|
|
argv_split(const char *s, int *argcp, char ***argvp, int terminate_on_comment)
|
|
{
|
|
int r = SSH_ERR_INTERNAL_ERROR;
|
|
int argc = 0, quote, i, j;
|
|
char *arg, **argv = xcalloc(1, sizeof(*argv));
|
|
|
|
*argvp = NULL;
|
|
*argcp = 0;
|
|
|
|
for (i = 0; s[i] != '\0'; i++) {
|
|
/* Skip leading whitespace */
|
|
if (s[i] == ' ' || s[i] == '\t')
|
|
continue;
|
|
if (terminate_on_comment && s[i] == '#')
|
|
break;
|
|
/* Start of a token */
|
|
quote = 0;
|
|
|
|
argv = xreallocarray(argv, (argc + 2), sizeof(*argv));
|
|
arg = argv[argc++] = xcalloc(1, strlen(s + i) + 1);
|
|
argv[argc] = NULL;
|
|
|
|
/* Copy the token in, removing escapes */
|
|
for (j = 0; s[i] != '\0'; i++) {
|
|
if (s[i] == '\\') {
|
|
if (s[i + 1] == '\'' ||
|
|
s[i + 1] == '\"' ||
|
|
s[i + 1] == '\\' ||
|
|
(quote == 0 && s[i + 1] == ' ')) {
|
|
i++; /* Skip '\' */
|
|
arg[j++] = s[i];
|
|
} else {
|
|
/* Unrecognised escape */
|
|
arg[j++] = s[i];
|
|
}
|
|
} else if (quote == 0 && (s[i] == ' ' || s[i] == '\t'))
|
|
break; /* done */
|
|
else if (quote == 0 && (s[i] == '\"' || s[i] == '\''))
|
|
quote = s[i]; /* quote start */
|
|
else if (quote != 0 && s[i] == quote)
|
|
quote = 0; /* quote end */
|
|
else
|
|
arg[j++] = s[i];
|
|
}
|
|
if (s[i] == '\0') {
|
|
if (quote != 0) {
|
|
/* Ran out of string looking for close quote */
|
|
r = SSH_ERR_INVALID_FORMAT;
|
|
goto out;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
/* Success */
|
|
*argcp = argc;
|
|
*argvp = argv;
|
|
argc = 0;
|
|
argv = NULL;
|
|
r = 0;
|
|
out:
|
|
if (argc != 0 && argv != NULL) {
|
|
for (i = 0; i < argc; i++)
|
|
free(argv[i]);
|
|
free(argv);
|
|
}
|
|
return r;
|
|
}
|
|
|
|
/*
|
|
* Reassemble an argument vector into a string, quoting and escaping as
|
|
* necessary. Caller must free returned string.
|
|
*/
|
|
char *
|
|
argv_assemble(int argc, char **argv)
|
|
{
|
|
int i, j, ws, r;
|
|
char c, *ret;
|
|
struct sshbuf *buf, *arg;
|
|
|
|
if ((buf = sshbuf_new()) == NULL || (arg = sshbuf_new()) == NULL)
|
|
fatal_f("sshbuf_new failed");
|
|
|
|
for (i = 0; i < argc; i++) {
|
|
ws = 0;
|
|
sshbuf_reset(arg);
|
|
for (j = 0; argv[i][j] != '\0'; j++) {
|
|
r = 0;
|
|
c = argv[i][j];
|
|
switch (c) {
|
|
case ' ':
|
|
case '\t':
|
|
ws = 1;
|
|
r = sshbuf_put_u8(arg, c);
|
|
break;
|
|
case '\\':
|
|
case '\'':
|
|
case '"':
|
|
if ((r = sshbuf_put_u8(arg, '\\')) != 0)
|
|
break;
|
|
/* FALLTHROUGH */
|
|
default:
|
|
r = sshbuf_put_u8(arg, c);
|
|
break;
|
|
}
|
|
if (r != 0)
|
|
fatal_fr(r, "sshbuf_put_u8");
|
|
}
|
|
if ((i != 0 && (r = sshbuf_put_u8(buf, ' ')) != 0) ||
|
|
(ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0) ||
|
|
(r = sshbuf_putb(buf, arg)) != 0 ||
|
|
(ws != 0 && (r = sshbuf_put_u8(buf, '"')) != 0))
|
|
fatal_fr(r, "assemble");
|
|
}
|
|
if ((ret = malloc(sshbuf_len(buf) + 1)) == NULL)
|
|
fatal_f("malloc failed");
|
|
memcpy(ret, sshbuf_ptr(buf), sshbuf_len(buf));
|
|
ret[sshbuf_len(buf)] = '\0';
|
|
sshbuf_free(buf);
|
|
sshbuf_free(arg);
|
|
return ret;
|
|
}
|
|
|
|
char *
|
|
argv_next(int *argcp, char ***argvp)
|
|
{
|
|
char *ret = (*argvp)[0];
|
|
|
|
if (*argcp > 0 && ret != NULL) {
|
|
(*argcp)--;
|
|
(*argvp)++;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
argv_consume(int *argcp)
|
|
{
|
|
*argcp = 0;
|
|
}
|
|
|
|
void
|
|
argv_free(char **av, int ac)
|
|
{
|
|
int i;
|
|
|
|
if (av == NULL)
|
|
return;
|
|
for (i = 0; i < ac; i++)
|
|
free(av[i]);
|
|
free(av);
|
|
}
|
|
|
|
/* Returns 0 if pid exited cleanly, non-zero otherwise */
|
|
int
|
|
exited_cleanly(pid_t pid, const char *tag, const char *cmd, int quiet)
|
|
{
|
|
int status;
|
|
|
|
while (waitpid(pid, &status, 0) == -1) {
|
|
if (errno != EINTR) {
|
|
error("%s waitpid: %s", tag, strerror(errno));
|
|
return -1;
|
|
}
|
|
}
|
|
if (WIFSIGNALED(status)) {
|
|
error("%s %s exited on signal %d", tag, cmd, WTERMSIG(status));
|
|
return -1;
|
|
} else if (WEXITSTATUS(status) != 0) {
|
|
do_log2(quiet ? SYSLOG_LEVEL_DEBUG1 : SYSLOG_LEVEL_INFO,
|
|
"%s %s failed, status %d", tag, cmd, WEXITSTATUS(status));
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check a given path for security. This is defined as all components
|
|
* of the path to the file must be owned by either the owner of
|
|
* of the file or root and no directories must be group or world writable.
|
|
*
|
|
* XXX Should any specific check be done for sym links ?
|
|
*
|
|
* Takes a file name, its stat information (preferably from fstat() to
|
|
* avoid races), the uid of the expected owner, their home directory and an
|
|
* error buffer plus max size as arguments.
|
|
*
|
|
* Returns 0 on success and -1 on failure
|
|
*/
|
|
int
|
|
safe_path(const char *name, struct stat *stp, const char *pw_dir,
|
|
uid_t uid, char *err, size_t errlen)
|
|
{
|
|
char buf[PATH_MAX], homedir[PATH_MAX];
|
|
char *cp;
|
|
int comparehome = 0;
|
|
struct stat st;
|
|
|
|
if (realpath(name, buf) == NULL) {
|
|
snprintf(err, errlen, "realpath %s failed: %s", name,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
if (pw_dir != NULL && realpath(pw_dir, homedir) != NULL)
|
|
comparehome = 1;
|
|
|
|
if (!S_ISREG(stp->st_mode)) {
|
|
snprintf(err, errlen, "%s is not a regular file", buf);
|
|
return -1;
|
|
}
|
|
if ((!platform_sys_dir_uid(stp->st_uid) && stp->st_uid != uid) ||
|
|
(stp->st_mode & 022) != 0) {
|
|
snprintf(err, errlen, "bad ownership or modes for file %s",
|
|
buf);
|
|
return -1;
|
|
}
|
|
|
|
/* for each component of the canonical path, walking upwards */
|
|
for (;;) {
|
|
if ((cp = dirname(buf)) == NULL) {
|
|
snprintf(err, errlen, "dirname() failed");
|
|
return -1;
|
|
}
|
|
strlcpy(buf, cp, sizeof(buf));
|
|
|
|
if (stat(buf, &st) == -1 ||
|
|
(!platform_sys_dir_uid(st.st_uid) && st.st_uid != uid) ||
|
|
(st.st_mode & 022) != 0) {
|
|
snprintf(err, errlen,
|
|
"bad ownership or modes for directory %s", buf);
|
|
return -1;
|
|
}
|
|
|
|
/* If are past the homedir then we can stop */
|
|
if (comparehome && strcmp(homedir, buf) == 0)
|
|
break;
|
|
|
|
/*
|
|
* dirname should always complete with a "/" path,
|
|
* but we can be paranoid and check for "." too
|
|
*/
|
|
if ((strcmp("/", buf) == 0) || (strcmp(".", buf) == 0))
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Version of safe_path() that accepts an open file descriptor to
|
|
* avoid races.
|
|
*
|
|
* Returns 0 on success and -1 on failure
|
|
*/
|
|
int
|
|
safe_path_fd(int fd, const char *file, struct passwd *pw,
|
|
char *err, size_t errlen)
|
|
{
|
|
struct stat st;
|
|
|
|
/* check the open file to avoid races */
|
|
if (fstat(fd, &st) == -1) {
|
|
snprintf(err, errlen, "cannot stat file %s: %s",
|
|
file, strerror(errno));
|
|
return -1;
|
|
}
|
|
return safe_path(file, &st, pw->pw_dir, pw->pw_uid, err, errlen);
|
|
}
|
|
|
|
/*
|
|
* Sets the value of the given variable in the environment. If the variable
|
|
* already exists, its value is overridden.
|
|
*/
|
|
void
|
|
child_set_env(char ***envp, u_int *envsizep, const char *name,
|
|
const char *value)
|
|
{
|
|
char **env;
|
|
u_int envsize;
|
|
u_int i, namelen;
|
|
|
|
if (strchr(name, '=') != NULL) {
|
|
error("Invalid environment variable \"%.100s\"", name);
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If we're passed an uninitialized list, allocate a single null
|
|
* entry before continuing.
|
|
*/
|
|
if (*envp == NULL && *envsizep == 0) {
|
|
*envp = xmalloc(sizeof(char *));
|
|
*envp[0] = NULL;
|
|
*envsizep = 1;
|
|
}
|
|
|
|
/*
|
|
* Find the slot where the value should be stored. If the variable
|
|
* already exists, we reuse the slot; otherwise we append a new slot
|
|
* at the end of the array, expanding if necessary.
|
|
*/
|
|
env = *envp;
|
|
namelen = strlen(name);
|
|
for (i = 0; env[i]; i++)
|
|
if (strncmp(env[i], name, namelen) == 0 && env[i][namelen] == '=')
|
|
break;
|
|
if (env[i]) {
|
|
/* Reuse the slot. */
|
|
free(env[i]);
|
|
} else {
|
|
/* New variable. Expand if necessary. */
|
|
envsize = *envsizep;
|
|
if (i >= envsize - 1) {
|
|
if (envsize >= 1000)
|
|
fatal("child_set_env: too many env vars");
|
|
envsize += 50;
|
|
env = (*envp) = xreallocarray(env, envsize, sizeof(char *));
|
|
*envsizep = envsize;
|
|
}
|
|
/* Need to set the NULL pointer at end of array beyond the new slot. */
|
|
env[i + 1] = NULL;
|
|
}
|
|
|
|
/* Allocate space and format the variable in the appropriate slot. */
|
|
/* XXX xasprintf */
|
|
env[i] = xmalloc(strlen(name) + 1 + strlen(value) + 1);
|
|
snprintf(env[i], strlen(name) + 1 + strlen(value) + 1, "%s=%s", name, value);
|
|
}
|
|
|
|
/*
|
|
* Check and optionally lowercase a domain name, also removes trailing '.'
|
|
* Returns 1 on success and 0 on failure, storing an error message in errstr.
|
|
*/
|
|
int
|
|
valid_domain(char *name, int makelower, const char **errstr)
|
|
{
|
|
size_t i, l = strlen(name);
|
|
u_char c, last = '\0';
|
|
static char errbuf[256];
|
|
|
|
if (l == 0) {
|
|
strlcpy(errbuf, "empty domain name", sizeof(errbuf));
|
|
goto bad;
|
|
}
|
|
if (!isalpha((u_char)name[0]) && !isdigit((u_char)name[0])) {
|
|
snprintf(errbuf, sizeof(errbuf), "domain name \"%.100s\" "
|
|
"starts with invalid character", name);
|
|
goto bad;
|
|
}
|
|
for (i = 0; i < l; i++) {
|
|
c = tolower((u_char)name[i]);
|
|
if (makelower)
|
|
name[i] = (char)c;
|
|
if (last == '.' && c == '.') {
|
|
snprintf(errbuf, sizeof(errbuf), "domain name "
|
|
"\"%.100s\" contains consecutive separators", name);
|
|
goto bad;
|
|
}
|
|
if (c != '.' && c != '-' && !isalnum(c) &&
|
|
c != '_') /* technically invalid, but common */ {
|
|
snprintf(errbuf, sizeof(errbuf), "domain name "
|
|
"\"%.100s\" contains invalid characters", name);
|
|
goto bad;
|
|
}
|
|
last = c;
|
|
}
|
|
if (name[l - 1] == '.')
|
|
name[l - 1] = '\0';
|
|
if (errstr != NULL)
|
|
*errstr = NULL;
|
|
return 1;
|
|
bad:
|
|
if (errstr != NULL)
|
|
*errstr = errbuf;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Verify that a environment variable name (not including initial '$') is
|
|
* valid; consisting of one or more alphanumeric or underscore characters only.
|
|
* Returns 1 on valid, 0 otherwise.
|
|
*/
|
|
int
|
|
valid_env_name(const char *name)
|
|
{
|
|
const char *cp;
|
|
|
|
if (name[0] == '\0')
|
|
return 0;
|
|
for (cp = name; *cp != '\0'; cp++) {
|
|
if (!isalnum((u_char)*cp) && *cp != '_')
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
const char *
|
|
atoi_err(const char *nptr, int *val)
|
|
{
|
|
const char *errstr = NULL;
|
|
long long num;
|
|
|
|
if (nptr == NULL || *nptr == '\0')
|
|
return "missing";
|
|
num = strtonum(nptr, 0, INT_MAX, &errstr);
|
|
if (errstr == NULL)
|
|
*val = (int)num;
|
|
return errstr;
|
|
}
|
|
|
|
int
|
|
parse_absolute_time(const char *s, uint64_t *tp)
|
|
{
|
|
struct tm tm;
|
|
time_t tt;
|
|
char buf[32], *fmt;
|
|
const char *cp;
|
|
size_t l;
|
|
int is_utc = 0;
|
|
|
|
*tp = 0;
|
|
|
|
l = strlen(s);
|
|
if (l > 1 && strcasecmp(s + l - 1, "Z") == 0) {
|
|
is_utc = 1;
|
|
l--;
|
|
} else if (l > 3 && strcasecmp(s + l - 3, "UTC") == 0) {
|
|
is_utc = 1;
|
|
l -= 3;
|
|
}
|
|
/*
|
|
* POSIX strptime says "The application shall ensure that there
|
|
* is white-space or other non-alphanumeric characters between
|
|
* any two conversion specifications" so arrange things this way.
|
|
*/
|
|
switch (l) {
|
|
case 8: /* YYYYMMDD */
|
|
fmt = "%Y-%m-%d";
|
|
snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2s", s, s + 4, s + 6);
|
|
break;
|
|
case 12: /* YYYYMMDDHHMM */
|
|
fmt = "%Y-%m-%dT%H:%M";
|
|
snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s",
|
|
s, s + 4, s + 6, s + 8, s + 10);
|
|
break;
|
|
case 14: /* YYYYMMDDHHMMSS */
|
|
fmt = "%Y-%m-%dT%H:%M:%S";
|
|
snprintf(buf, sizeof(buf), "%.4s-%.2s-%.2sT%.2s:%.2s:%.2s",
|
|
s, s + 4, s + 6, s + 8, s + 10, s + 12);
|
|
break;
|
|
default:
|
|
return SSH_ERR_INVALID_FORMAT;
|
|
}
|
|
|
|
memset(&tm, 0, sizeof(tm));
|
|
if ((cp = strptime(buf, fmt, &tm)) == NULL || *cp != '\0')
|
|
return SSH_ERR_INVALID_FORMAT;
|
|
if (is_utc) {
|
|
if ((tt = timegm(&tm)) < 0)
|
|
return SSH_ERR_INVALID_FORMAT;
|
|
} else {
|
|
if ((tt = mktime(&tm)) < 0)
|
|
return SSH_ERR_INVALID_FORMAT;
|
|
}
|
|
/* success */
|
|
*tp = (uint64_t)tt;
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
format_absolute_time(uint64_t t, char *buf, size_t len)
|
|
{
|
|
time_t tt = t > SSH_TIME_T_MAX ? SSH_TIME_T_MAX : t;
|
|
struct tm tm;
|
|
|
|
localtime_r(&tt, &tm);
|
|
strftime(buf, len, "%Y-%m-%dT%H:%M:%S", &tm);
|
|
}
|
|
|
|
/* check if path is absolute */
|
|
int
|
|
path_absolute(const char *path)
|
|
{
|
|
return (*path == '/') ? 1 : 0;
|
|
}
|
|
|
|
void
|
|
skip_space(char **cpp)
|
|
{
|
|
char *cp;
|
|
|
|
for (cp = *cpp; *cp == ' ' || *cp == '\t'; cp++)
|
|
;
|
|
*cpp = cp;
|
|
}
|
|
|
|
/* authorized_key-style options parsing helpers */
|
|
|
|
/*
|
|
* Match flag 'opt' in *optsp, and if allow_negate is set then also match
|
|
* 'no-opt'. Returns -1 if option not matched, 1 if option matches or 0
|
|
* if negated option matches.
|
|
* If the option or negated option matches, then *optsp is updated to
|
|
* point to the first character after the option.
|
|
*/
|
|
int
|
|
opt_flag(const char *opt, int allow_negate, const char **optsp)
|
|
{
|
|
size_t opt_len = strlen(opt);
|
|
const char *opts = *optsp;
|
|
int negate = 0;
|
|
|
|
if (allow_negate && strncasecmp(opts, "no-", 3) == 0) {
|
|
opts += 3;
|
|
negate = 1;
|
|
}
|
|
if (strncasecmp(opts, opt, opt_len) == 0) {
|
|
*optsp = opts + opt_len;
|
|
return negate ? 0 : 1;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
char *
|
|
opt_dequote(const char **sp, const char **errstrp)
|
|
{
|
|
const char *s = *sp;
|
|
char *ret;
|
|
size_t i;
|
|
|
|
*errstrp = NULL;
|
|
if (*s != '"') {
|
|
*errstrp = "missing start quote";
|
|
return NULL;
|
|
}
|
|
s++;
|
|
if ((ret = malloc(strlen((s)) + 1)) == NULL) {
|
|
*errstrp = "memory allocation failed";
|
|
return NULL;
|
|
}
|
|
for (i = 0; *s != '\0' && *s != '"';) {
|
|
if (s[0] == '\\' && s[1] == '"')
|
|
s++;
|
|
ret[i++] = *s++;
|
|
}
|
|
if (*s == '\0') {
|
|
*errstrp = "missing end quote";
|
|
free(ret);
|
|
return NULL;
|
|
}
|
|
ret[i] = '\0';
|
|
s++;
|
|
*sp = s;
|
|
return ret;
|
|
}
|
|
|
|
int
|
|
opt_match(const char **opts, const char *term)
|
|
{
|
|
if (strncasecmp((*opts), term, strlen(term)) == 0 &&
|
|
(*opts)[strlen(term)] == '=') {
|
|
*opts += strlen(term) + 1;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
opt_array_append2(const char *file, const int line, const char *directive,
|
|
char ***array, int **iarray, u_int *lp, const char *s, int i)
|
|
{
|
|
|
|
if (*lp >= INT_MAX)
|
|
fatal("%s line %d: Too many %s entries", file, line, directive);
|
|
|
|
if (iarray != NULL) {
|
|
*iarray = xrecallocarray(*iarray, *lp, *lp + 1,
|
|
sizeof(**iarray));
|
|
(*iarray)[*lp] = i;
|
|
}
|
|
|
|
*array = xrecallocarray(*array, *lp, *lp + 1, sizeof(**array));
|
|
(*array)[*lp] = xstrdup(s);
|
|
(*lp)++;
|
|
}
|
|
|
|
void
|
|
opt_array_append(const char *file, const int line, const char *directive,
|
|
char ***array, u_int *lp, const char *s)
|
|
{
|
|
opt_array_append2(file, line, directive, array, NULL, lp, s, 0);
|
|
}
|
|
|
|
sshsig_t
|
|
ssh_signal(int signum, sshsig_t handler)
|
|
{
|
|
struct sigaction sa, osa;
|
|
|
|
/* mask all other signals while in handler */
|
|
memset(&sa, 0, sizeof(sa));
|
|
sa.sa_handler = handler;
|
|
sigfillset(&sa.sa_mask);
|
|
#if defined(SA_RESTART) && !defined(NO_SA_RESTART)
|
|
if (signum != SIGALRM)
|
|
sa.sa_flags = SA_RESTART;
|
|
#endif
|
|
if (sigaction(signum, &sa, &osa) == -1) {
|
|
debug3("sigaction(%s): %s", strsignal(signum), strerror(errno));
|
|
return SIG_ERR;
|
|
}
|
|
return osa.sa_handler;
|
|
}
|
|
|
|
int
|
|
stdfd_devnull(int do_stdin, int do_stdout, int do_stderr)
|
|
{
|
|
int devnull, ret = 0;
|
|
|
|
if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
|
|
error_f("open %s: %s", _PATH_DEVNULL,
|
|
strerror(errno));
|
|
return -1;
|
|
}
|
|
if ((do_stdin && dup2(devnull, STDIN_FILENO) == -1) ||
|
|
(do_stdout && dup2(devnull, STDOUT_FILENO) == -1) ||
|
|
(do_stderr && dup2(devnull, STDERR_FILENO) == -1)) {
|
|
error_f("dup2: %s", strerror(errno));
|
|
ret = -1;
|
|
}
|
|
if (devnull > STDERR_FILENO)
|
|
close(devnull);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Runs command in a subprocess with a minimal environment.
|
|
* Returns pid on success, 0 on failure.
|
|
* The child stdout and stderr maybe captured, left attached or sent to
|
|
* /dev/null depending on the contents of flags.
|
|
* "tag" is prepended to log messages.
|
|
* NB. "command" is only used for logging; the actual command executed is
|
|
* av[0].
|
|
*/
|
|
pid_t
|
|
subprocess(const char *tag, const char *command,
|
|
int ac, char **av, FILE **child, u_int flags,
|
|
struct passwd *pw, privdrop_fn *drop_privs, privrestore_fn *restore_privs)
|
|
{
|
|
FILE *f = NULL;
|
|
struct stat st;
|
|
int fd, devnull, p[2], i;
|
|
pid_t pid;
|
|
char *cp, errmsg[512];
|
|
u_int nenv = 0;
|
|
char **env = NULL;
|
|
|
|
/* If dropping privs, then must specify user and restore function */
|
|
if (drop_privs != NULL && (pw == NULL || restore_privs == NULL)) {
|
|
error("%s: inconsistent arguments", tag); /* XXX fatal? */
|
|
return 0;
|
|
}
|
|
if (pw == NULL && (pw = getpwuid(getuid())) == NULL) {
|
|
error("%s: no user for current uid", tag);
|
|
return 0;
|
|
}
|
|
if (child != NULL)
|
|
*child = NULL;
|
|
|
|
debug3_f("%s command \"%s\" running as %s (flags 0x%x)",
|
|
tag, command, pw->pw_name, flags);
|
|
|
|
/* Check consistency */
|
|
if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
|
|
(flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0) {
|
|
error_f("inconsistent flags");
|
|
return 0;
|
|
}
|
|
if (((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0) != (child == NULL)) {
|
|
error_f("inconsistent flags/output");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* If executing an explicit binary, then verify the it exists
|
|
* and appears safe-ish to execute
|
|
*/
|
|
if (!path_absolute(av[0])) {
|
|
error("%s path is not absolute", tag);
|
|
return 0;
|
|
}
|
|
if (drop_privs != NULL)
|
|
drop_privs(pw);
|
|
if (stat(av[0], &st) == -1) {
|
|
error("Could not stat %s \"%s\": %s", tag,
|
|
av[0], strerror(errno));
|
|
goto restore_return;
|
|
}
|
|
if ((flags & SSH_SUBPROCESS_UNSAFE_PATH) == 0 &&
|
|
safe_path(av[0], &st, NULL, 0, errmsg, sizeof(errmsg)) != 0) {
|
|
error("Unsafe %s \"%s\": %s", tag, av[0], errmsg);
|
|
goto restore_return;
|
|
}
|
|
/* Prepare to keep the child's stdout if requested */
|
|
if (pipe(p) == -1) {
|
|
error("%s: pipe: %s", tag, strerror(errno));
|
|
restore_return:
|
|
if (restore_privs != NULL)
|
|
restore_privs();
|
|
return 0;
|
|
}
|
|
if (restore_privs != NULL)
|
|
restore_privs();
|
|
|
|
switch ((pid = fork())) {
|
|
case -1: /* error */
|
|
error("%s: fork: %s", tag, strerror(errno));
|
|
close(p[0]);
|
|
close(p[1]);
|
|
return 0;
|
|
case 0: /* child */
|
|
/* Prepare a minimal environment for the child. */
|
|
if ((flags & SSH_SUBPROCESS_PRESERVE_ENV) == 0) {
|
|
nenv = 5;
|
|
env = xcalloc(sizeof(*env), nenv);
|
|
child_set_env(&env, &nenv, "PATH", _PATH_STDPATH);
|
|
child_set_env(&env, &nenv, "USER", pw->pw_name);
|
|
child_set_env(&env, &nenv, "LOGNAME", pw->pw_name);
|
|
child_set_env(&env, &nenv, "HOME", pw->pw_dir);
|
|
if ((cp = getenv("LANG")) != NULL)
|
|
child_set_env(&env, &nenv, "LANG", cp);
|
|
}
|
|
|
|
for (i = 1; i < NSIG; i++)
|
|
ssh_signal(i, SIG_DFL);
|
|
|
|
if ((devnull = open(_PATH_DEVNULL, O_RDWR)) == -1) {
|
|
error("%s: open %s: %s", tag, _PATH_DEVNULL,
|
|
strerror(errno));
|
|
_exit(1);
|
|
}
|
|
if (dup2(devnull, STDIN_FILENO) == -1) {
|
|
error("%s: dup2: %s", tag, strerror(errno));
|
|
_exit(1);
|
|
}
|
|
|
|
/* Set up stdout as requested; leave stderr in place for now. */
|
|
fd = -1;
|
|
if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) != 0)
|
|
fd = p[1];
|
|
else if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0)
|
|
fd = devnull;
|
|
if (fd != -1 && dup2(fd, STDOUT_FILENO) == -1) {
|
|
error("%s: dup2: %s", tag, strerror(errno));
|
|
_exit(1);
|
|
}
|
|
closefrom(STDERR_FILENO + 1);
|
|
|
|
if (geteuid() == 0 &&
|
|
initgroups(pw->pw_name, pw->pw_gid) == -1) {
|
|
error("%s: initgroups(%s, %u): %s", tag,
|
|
pw->pw_name, (u_int)pw->pw_gid, strerror(errno));
|
|
_exit(1);
|
|
}
|
|
if (setresgid(pw->pw_gid, pw->pw_gid, pw->pw_gid) == -1) {
|
|
error("%s: setresgid %u: %s", tag, (u_int)pw->pw_gid,
|
|
strerror(errno));
|
|
_exit(1);
|
|
}
|
|
if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1) {
|
|
error("%s: setresuid %u: %s", tag, (u_int)pw->pw_uid,
|
|
strerror(errno));
|
|
_exit(1);
|
|
}
|
|
/* stdin is pointed to /dev/null at this point */
|
|
if ((flags & SSH_SUBPROCESS_STDOUT_DISCARD) != 0 &&
|
|
dup2(STDIN_FILENO, STDERR_FILENO) == -1) {
|
|
error("%s: dup2: %s", tag, strerror(errno));
|
|
_exit(1);
|
|
}
|
|
if (env != NULL)
|
|
execve(av[0], av, env);
|
|
else
|
|
execv(av[0], av);
|
|
error("%s %s \"%s\": %s", tag, env == NULL ? "execv" : "execve",
|
|
command, strerror(errno));
|
|
_exit(127);
|
|
default: /* parent */
|
|
break;
|
|
}
|
|
|
|
close(p[1]);
|
|
if ((flags & SSH_SUBPROCESS_STDOUT_CAPTURE) == 0)
|
|
close(p[0]);
|
|
else if ((f = fdopen(p[0], "r")) == NULL) {
|
|
error("%s: fdopen: %s", tag, strerror(errno));
|
|
close(p[0]);
|
|
/* Don't leave zombie child */
|
|
kill(pid, SIGTERM);
|
|
while (waitpid(pid, NULL, 0) == -1 && errno == EINTR)
|
|
;
|
|
return 0;
|
|
}
|
|
/* Success */
|
|
debug3_f("%s pid %ld", tag, (long)pid);
|
|
if (child != NULL)
|
|
*child = f;
|
|
return pid;
|
|
}
|
|
|
|
const char *
|
|
lookup_env_in_list(const char *env, char * const *envs, size_t nenvs)
|
|
{
|
|
size_t i, envlen;
|
|
|
|
envlen = strlen(env);
|
|
for (i = 0; i < nenvs; i++) {
|
|
if (strncmp(envs[i], env, envlen) == 0 &&
|
|
envs[i][envlen] == '=') {
|
|
return envs[i] + envlen + 1;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
const char *
|
|
lookup_setenv_in_list(const char *env, char * const *envs, size_t nenvs)
|
|
{
|
|
char *name, *cp;
|
|
const char *ret;
|
|
|
|
name = xstrdup(env);
|
|
if ((cp = strchr(name, '=')) == NULL) {
|
|
free(name);
|
|
return NULL; /* not env=val */
|
|
}
|
|
*cp = '\0';
|
|
ret = lookup_env_in_list(name, envs, nenvs);
|
|
free(name);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Helpers for managing poll(2)/ppoll(2) timeouts
|
|
* Will remember the earliest deadline and return it for use in poll/ppoll.
|
|
*/
|
|
|
|
/* Initialise a poll/ppoll timeout with an indefinite deadline */
|
|
void
|
|
ptimeout_init(struct timespec *pt)
|
|
{
|
|
/*
|
|
* Deliberately invalid for ppoll(2).
|
|
* Will be converted to NULL in ptimeout_get_tspec() later.
|
|
*/
|
|
pt->tv_sec = -1;
|
|
pt->tv_nsec = 0;
|
|
}
|
|
|
|
/* Specify a poll/ppoll deadline of at most 'sec' seconds */
|
|
void
|
|
ptimeout_deadline_sec(struct timespec *pt, long sec)
|
|
{
|
|
if (pt->tv_sec == -1 || pt->tv_sec >= sec) {
|
|
pt->tv_sec = sec;
|
|
pt->tv_nsec = 0;
|
|
}
|
|
}
|
|
|
|
/* Specify a poll/ppoll deadline of at most 'p' (timespec) */
|
|
static void
|
|
ptimeout_deadline_tsp(struct timespec *pt, struct timespec *p)
|
|
{
|
|
if (pt->tv_sec == -1 || timespeccmp(pt, p, >=))
|
|
*pt = *p;
|
|
}
|
|
|
|
/* Specify a poll/ppoll deadline of at most 'ms' milliseconds */
|
|
void
|
|
ptimeout_deadline_ms(struct timespec *pt, long ms)
|
|
{
|
|
struct timespec p;
|
|
|
|
p.tv_sec = ms / 1000;
|
|
p.tv_nsec = (ms % 1000) * 1000000;
|
|
ptimeout_deadline_tsp(pt, &p);
|
|
}
|
|
|
|
/* Specify a poll/ppoll deadline at wall clock monotime 'when' */
|
|
void
|
|
ptimeout_deadline_monotime(struct timespec *pt, time_t when)
|
|
{
|
|
struct timespec now, t;
|
|
|
|
t.tv_sec = when;
|
|
t.tv_nsec = 0;
|
|
monotime_ts(&now);
|
|
|
|
if (timespeccmp(&now, &t, >=))
|
|
ptimeout_deadline_sec(pt, 0);
|
|
else {
|
|
timespecsub(&t, &now, &t);
|
|
ptimeout_deadline_tsp(pt, &t);
|
|
}
|
|
}
|
|
|
|
/* Get a poll(2) timeout value in milliseconds */
|
|
int
|
|
ptimeout_get_ms(struct timespec *pt)
|
|
{
|
|
if (pt->tv_sec == -1)
|
|
return -1;
|
|
if (pt->tv_sec >= (INT_MAX - (pt->tv_nsec / 1000000)) / 1000)
|
|
return INT_MAX;
|
|
return (pt->tv_sec * 1000) + (pt->tv_nsec / 1000000);
|
|
}
|
|
|
|
/* Get a ppoll(2) timeout value as a timespec pointer */
|
|
struct timespec *
|
|
ptimeout_get_tsp(struct timespec *pt)
|
|
{
|
|
return pt->tv_sec == -1 ? NULL : pt;
|
|
}
|
|
|
|
/* Returns non-zero if a timeout has been set (i.e. is not indefinite) */
|
|
int
|
|
ptimeout_isset(struct timespec *pt)
|
|
{
|
|
return pt->tv_sec != -1;
|
|
}
|