depending on namespace pollution in <sys/stat.h>. struct bintime is only needed to satisfy leakage of kernel interfaces to userland and namespace bugs in those interfaces...
651 lines
16 KiB
C
651 lines
16 KiB
C
/*-
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* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/param.h>
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#include <sys/queue.h>
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#include <sys/endian.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/time.h>
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#include <sys/disk.h>
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#include <sys/bio.h>
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#include <netinet/in.h>
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#include <netinet/tcp.h>
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#include <arpa/inet.h>
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#include <signal.h>
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#include <err.h>
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#include <errno.h>
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#include <string.h>
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#include <libgen.h>
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#include <syslog.h>
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#include <stdarg.h>
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#include <geom/gate/g_gate.h>
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#include "ggate.h"
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#define G_GATED_EXPORT_FILE "/etc/gg.exports"
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#define G_GATED_DEBUG(...) \
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if (g_gate_verbose) { \
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printf(__VA_ARGS__); \
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printf("\n"); \
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}
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static const char *exports = G_GATED_EXPORT_FILE;
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static int got_sighup = 0;
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static int nagle = 1;
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static unsigned rcvbuf = G_GATE_RCVBUF;
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static unsigned sndbuf = G_GATE_SNDBUF;
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struct export {
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char *e_path; /* path to device/file */
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in_addr_t e_ip; /* remote IP address */
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in_addr_t e_mask; /* IP mask */
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unsigned e_flags; /* flags (RO/RW) */
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SLIST_ENTRY(export) e_next;
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};
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static SLIST_HEAD(, export) exports_list =
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SLIST_HEAD_INITIALIZER(&exports_list);
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static void
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usage(void)
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{
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fprintf(stderr, "usage: %s [-nv] [-a address] [-p port] [-R rcvbuf] "
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"[-S sndbuf] [exports file]\n", getprogname());
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exit(EXIT_FAILURE);
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}
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static char *
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ip2str(in_addr_t ip)
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{
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static char sip[16];
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snprintf(sip, sizeof(sip), "%u.%u.%u.%u",
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((ip >> 24) & 0xff),
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((ip >> 16) & 0xff),
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((ip >> 8) & 0xff),
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(ip & 0xff));
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return (sip);
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}
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static in_addr_t
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countmask(unsigned m)
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{
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in_addr_t mask;
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if (m == 0) {
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mask = 0x0;
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} else {
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mask = 1 << (32 - m);
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mask--;
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mask = ~mask;
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}
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return (mask);
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}
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static void
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line_parse(char *line, unsigned lineno)
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{
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struct export *ex;
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char *word, *path, *sflags;
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unsigned flags, i, vmask;
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in_addr_t ip, mask;
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ip = mask = flags = vmask = 0;
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path = NULL;
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sflags = NULL;
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for (i = 0, word = strtok(line, " \t"); word != NULL;
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i++, word = strtok(NULL, " \t")) {
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switch (i) {
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case 0: /* IP address or host name */
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ip = g_gate_str2ip(strsep(&word, "/"));
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if (ip == INADDR_NONE) {
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g_gate_xlog("Invalid IP/host name at line %u.",
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lineno);
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}
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ip = ntohl(ip);
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if (word == NULL)
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vmask = 32;
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else {
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errno = 0;
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vmask = strtoul(word, NULL, 10);
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if (vmask == 0 && errno != 0) {
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g_gate_xlog("Invalid IP mask value at "
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"line %u.", lineno);
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}
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if ((unsigned)vmask > 32) {
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g_gate_xlog("Invalid IP mask value at line %u.",
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lineno);
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}
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}
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mask = countmask(vmask);
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break;
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case 1: /* flags */
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if (strcasecmp("rd", word) == 0 ||
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strcasecmp("ro", word) == 0) {
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flags = O_RDONLY;
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} else if (strcasecmp("wo", word) == 0) {
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flags = O_WRONLY;
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} else if (strcasecmp("rw", word) == 0) {
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flags = O_RDWR;
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} else {
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g_gate_xlog("Invalid value in flags field at "
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"line %u.", lineno);
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}
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sflags = word;
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break;
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case 2: /* path */
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if (strlen(word) >= MAXPATHLEN) {
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g_gate_xlog("Path too long at line %u. ",
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lineno);
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}
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path = word;
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break;
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default:
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g_gate_xlog("Too many arguments at line %u. ", lineno);
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}
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}
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if (i != 3)
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g_gate_xlog("Too few arguments at line %u.", lineno);
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ex = malloc(sizeof(*ex));
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if (ex == NULL)
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g_gate_xlog("No enough memory.");
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ex->e_path = strdup(path);
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if (ex->e_path == NULL)
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g_gate_xlog("No enough memory.");
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/* Made 'and' here. */
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ex->e_ip = (ip & mask);
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ex->e_mask = mask;
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ex->e_flags = flags;
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SLIST_INSERT_HEAD(&exports_list, ex, e_next);
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g_gate_log(LOG_DEBUG, "Added %s/%u %s %s to exports list.",
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ip2str(ex->e_ip), vmask, path, sflags);
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}
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static void
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exports_clear(void)
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{
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struct export *ex;
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while (!SLIST_EMPTY(&exports_list)) {
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ex = SLIST_FIRST(&exports_list);
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SLIST_REMOVE_HEAD(&exports_list, e_next);
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free(ex);
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}
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}
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#define EXPORTS_LINE_SIZE 2048
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static void
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exports_get(void)
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{
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char buf[EXPORTS_LINE_SIZE], *line;
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unsigned lineno = 0, objs = 0, len;
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FILE *fd;
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exports_clear();
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fd = fopen(exports, "r");
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if (fd == NULL) {
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g_gate_xlog("Cannot open exports file (%s): %s.", exports,
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strerror(errno));
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}
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g_gate_log(LOG_INFO, "Reading exports file (%s).", exports);
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for (;;) {
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if (fgets(buf, sizeof(buf), fd) == NULL) {
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if (feof(fd))
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break;
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g_gate_xlog("Error while reading exports file: %s.",
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strerror(errno));
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}
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/* Increase line count. */
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lineno++;
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/* Skip spaces and tabs. */
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for (line = buf; *line == ' ' || *line == '\t'; ++line)
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;
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/* Empty line, comment or empty line at the end of file. */
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if (*line == '\n' || *line == '#' || *line == '\0')
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continue;
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len = strlen(line);
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if (line[len - 1] == '\n') {
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/* Remove new line char. */
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line[len - 1] = '\0';
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} else {
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if (!feof(fd))
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g_gate_xlog("Line %u too long.", lineno);
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}
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line_parse(line, lineno);
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objs++;
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}
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fclose(fd);
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if (objs == 0)
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g_gate_xlog("There are no objects to export.");
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g_gate_log(LOG_INFO, "Exporting %u object(s).", objs);
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}
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static struct export *
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exports_find(struct sockaddr *s, const char *path)
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{
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struct export *ex;
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in_addr_t ip;
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ip = htonl(((struct sockaddr_in *)(void *)s)->sin_addr.s_addr);
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SLIST_FOREACH(ex, &exports_list, e_next) {
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if ((ip & ex->e_mask) != ex->e_ip)
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continue;
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if (path != NULL && strcmp(path, ex->e_path) != 0)
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continue;
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g_gate_log(LOG_INFO, "Connection from: %s.", ip2str(ip));
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return (ex);
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}
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g_gate_log(LOG_INFO, "Unauthorized connection from: %s.", ip2str(ip));
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return (NULL);
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}
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static void
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sendfail(int sfd, int error, const char *fmt, ...)
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{
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struct g_gate_sinit sinit;
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va_list ap;
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int data;
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sinit.gs_error = error;
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g_gate_swap2n_sinit(&sinit);
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data = send(sfd, &sinit, sizeof(sinit), 0);
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g_gate_swap2h_sinit(&sinit);
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if (data == -1) {
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g_gate_xlog("Error while sending initial packet: %s.",
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strerror(errno));
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}
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if (fmt != NULL) {
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va_start(ap, fmt);
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g_gate_xvlog(fmt, ap);
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/* NOTREACHED */
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va_end(ap);
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}
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exit(EXIT_FAILURE);
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}
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static void
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serve(int sfd, struct sockaddr *s)
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{
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struct g_gate_cinit cinit;
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struct g_gate_sinit sinit;
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struct g_gate_hdr hdr;
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struct export *ex;
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char ipmask[32]; /* 32 == strlen("xxx.xxx.xxx.xxx/xxx.xxx.xxx.xxx")+1 */
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size_t bufsize;
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int32_t error;
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int fd, flags;
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ssize_t data;
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char *buf;
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g_gate_log(LOG_DEBUG, "Receiving initial packet.");
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data = recv(sfd, &cinit, sizeof(cinit), MSG_WAITALL);
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g_gate_swap2h_cinit(&cinit);
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if (data == -1) {
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g_gate_xlog("Error while receiving initial packet: %s.",
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strerror(errno));
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}
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ex = exports_find(s, cinit.gc_path);
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if (ex == NULL) {
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sendfail(sfd, EINVAL, "Requested path isn't exported: %s.",
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strerror(errno));
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}
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error = 0;
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strlcpy(ipmask, ip2str(ex->e_ip), sizeof(ipmask));
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strlcat(ipmask, "/", sizeof(ipmask));
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strlcat(ipmask, ip2str(ex->e_mask), sizeof(ipmask));
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if ((cinit.gc_flags & G_GATE_FLAG_READONLY) != 0) {
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if (ex->e_flags == O_WRONLY) {
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g_gate_log(LOG_ERR, "Read-only access requested, but "
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"%s (%s) is exported write-only.", ex->e_path,
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ipmask);
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error = EPERM;
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} else {
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sinit.gs_flags = G_GATE_FLAG_READONLY;
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}
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} else if ((cinit.gc_flags & G_GATE_FLAG_WRITEONLY) != 0) {
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if (ex->e_flags == O_RDONLY) {
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g_gate_log(LOG_ERR, "Write-only access requested, but "
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"%s (%s) is exported read-only.", ex->e_path,
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ipmask);
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error = EPERM;
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} else {
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sinit.gs_flags = G_GATE_FLAG_WRITEONLY;
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}
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} else {
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if (ex->e_flags == O_RDONLY) {
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g_gate_log(LOG_ERR, "Read-write access requested, but "
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"%s (%s) is exported read-only.", ex->e_path,
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ipmask);
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error = EPERM;
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} else if (ex->e_flags == O_WRONLY) {
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g_gate_log(LOG_ERR, "Read-write access requested, but "
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"%s (%s) is exported write-only.", ex->e_path,
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ipmask);
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error = EPERM;
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} else {
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sinit.gs_flags = 0;
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}
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}
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if (error != 0)
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sendfail(sfd, error, NULL);
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flags = g_gate_openflags(sinit.gs_flags);;
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fd = open(ex->e_path, flags);
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if (fd < 0) {
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sendfail(sfd, errno, "Error while opening %s: %s.", ex->e_path,
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strerror(errno));
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}
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g_gate_log(LOG_DEBUG, "Sending initial packet.");
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/*
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* This field isn't used by ggc(8) for now.
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* It should be used in future when user don't give device size.
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*/
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sinit.gs_mediasize = g_gate_mediasize(fd);
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sinit.gs_sectorsize = g_gate_sectorsize(fd);
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sinit.gs_error = 0;
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g_gate_swap2n_sinit(&sinit);
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data = send(sfd, &sinit, sizeof(sinit), 0);
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g_gate_swap2h_sinit(&sinit);
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if (data == -1) {
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sendfail(sfd, errno, "Error while sending initial packet: %s.",
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strerror(errno));
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}
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bufsize = G_GATE_BUFSIZE_START;
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buf = malloc(bufsize);
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if (buf == NULL)
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g_gate_xlog("No enough memory.");
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g_gate_log(LOG_DEBUG, "New process: %u.", getpid());
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for (;;) {
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/*
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* Receive request.
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*/
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data = recv(sfd, &hdr, sizeof(hdr), MSG_WAITALL);
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if (data == 0) {
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g_gate_log(LOG_DEBUG, "Process %u exiting.", getpid());
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exit(EXIT_SUCCESS);
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} else if (data == -1) {
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g_gate_xlog("Error while receiving hdr packet: %s.",
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strerror(errno));
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} else if (data != sizeof(hdr)) {
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g_gate_xlog("Malformed hdr packet received.");
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}
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g_gate_log(LOG_DEBUG, "Received hdr packet.");
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g_gate_swap2h_hdr(&hdr);
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/*
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* Increase buffer if there is need to.
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*/
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if (hdr.gh_length > bufsize) {
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bufsize = hdr.gh_length;
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g_gate_log(LOG_DEBUG, "Increasing buffer to %u.",
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bufsize);
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buf = realloc(buf, bufsize);
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if (buf == NULL)
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g_gate_xlog("No enough memory.");
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}
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if (hdr.gh_cmd == BIO_READ) {
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if (pread(fd, buf, hdr.gh_length,
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hdr.gh_offset) == -1) {
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error = errno;
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g_gate_log(LOG_ERR, "Error while reading data "
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"(offset=%ju, size=%zu): %s.",
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(uintmax_t)hdr.gh_offset,
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(size_t)hdr.gh_length, strerror(error));
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} else {
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error = 0;
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}
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hdr.gh_error = error;
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g_gate_swap2n_hdr(&hdr);
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if (send(sfd, &hdr, sizeof(hdr), 0) == -1) {
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g_gate_xlog("Error while sending status: %s.",
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strerror(errno));
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}
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g_gate_swap2h_hdr(&hdr);
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/* Send data only if there was no error while pread(). */
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if (error == 0) {
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data = send(sfd, buf, hdr.gh_length, 0);
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if (data == -1) {
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g_gate_xlog("Error while sending data: "
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"%s.", strerror(errno));
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}
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g_gate_log(LOG_DEBUG, "Sent %d bytes "
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"(offset=%ju, size=%zu).", data,
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(uintmax_t)hdr.gh_offset,
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(size_t)hdr.gh_length);
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}
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} else /* if (hdr.gh_cmd == BIO_WRITE) */ {
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g_gate_log(LOG_DEBUG, "Waiting for %u bytes of data...",
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hdr.gh_length);
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data = recv(sfd, buf, hdr.gh_length, MSG_WAITALL);
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if (data == -1) {
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g_gate_xlog("Error while receiving data: %s.",
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strerror(errno));
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}
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if (pwrite(fd, buf, hdr.gh_length, hdr.gh_offset) == -1) {
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error = errno;
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g_gate_log(LOG_ERR, "Error while writing data "
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"(offset=%llu, size=%u): %s.",
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hdr.gh_offset, hdr.gh_length,
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strerror(error));
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} else {
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error = 0;
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}
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hdr.gh_error = error;
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g_gate_swap2n_hdr(&hdr);
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if (send(sfd, &hdr, sizeof(hdr), 0) == -1) {
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g_gate_xlog("Error while sending status: %s.",
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strerror(errno));
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}
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g_gate_swap2h_hdr(&hdr);
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g_gate_log(LOG_DEBUG, "Received %d bytes (offset=%llu, "
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"size=%u).", data, hdr.gh_offset, hdr.gh_length);
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}
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g_gate_log(LOG_DEBUG, "Tick.");
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}
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}
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static void
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huphandler(int sig __unused)
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{
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|
|
|
got_sighup = 1;
|
|
}
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct sockaddr_in serv;
|
|
struct sockaddr from;
|
|
in_addr_t bindaddr;
|
|
socklen_t fromlen;
|
|
struct timeval tv;
|
|
int on, sfd, tmpsfd;
|
|
pid_t childpid;
|
|
unsigned bsize, port;
|
|
|
|
bindaddr = htonl(INADDR_ANY);
|
|
port = G_GATE_PORT;
|
|
for (;;) {
|
|
int ch;
|
|
|
|
ch = getopt(argc, argv, "a:hnp:R:S:v");
|
|
if (ch == -1)
|
|
break;
|
|
switch (ch) {
|
|
case 'a':
|
|
bindaddr = g_gate_str2ip(optarg);
|
|
if (bindaddr == INADDR_NONE) {
|
|
errx(EXIT_FAILURE,
|
|
"Invalid IP/host name to bind to.");
|
|
}
|
|
break;
|
|
case 'n':
|
|
nagle = 0;
|
|
break;
|
|
case 'p':
|
|
errno = 0;
|
|
port = strtoul(optarg, NULL, 10);
|
|
if (port == 0 && errno != 0)
|
|
errx(EXIT_FAILURE, "Invalid port.");
|
|
break;
|
|
case 'R':
|
|
errno = 0;
|
|
rcvbuf = strtoul(optarg, NULL, 10);
|
|
if (rcvbuf == 0 && errno != 0)
|
|
errx(EXIT_FAILURE, "Invalid rcvbuf.");
|
|
break;
|
|
case 'S':
|
|
errno = 0;
|
|
sndbuf = strtoul(optarg, NULL, 10);
|
|
if (sndbuf == 0 && errno != 0)
|
|
errx(EXIT_FAILURE, "Invalid sndbuf.");
|
|
break;
|
|
case 'v':
|
|
g_gate_verbose++;
|
|
break;
|
|
case 'h':
|
|
default:
|
|
usage();
|
|
}
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argv[0] != NULL)
|
|
exports = argv[0];
|
|
exports_get();
|
|
|
|
if (!g_gate_verbose) {
|
|
/* Run in daemon mode. */
|
|
if (daemon(0, 0) < 0)
|
|
g_gate_xlog("Can't daemonize: %s", strerror(errno));
|
|
}
|
|
|
|
signal(SIGCHLD, SIG_IGN);
|
|
|
|
sfd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (sfd < 0)
|
|
g_gate_xlog("Can't open stream socket: %s.", strerror(errno));
|
|
bzero(&serv, sizeof(serv));
|
|
serv.sin_family = AF_INET;
|
|
serv.sin_addr.s_addr = bindaddr;
|
|
serv.sin_port = htons(port);
|
|
on = 1;
|
|
if (nagle) {
|
|
if (setsockopt(sfd, IPPROTO_TCP, TCP_NODELAY, &on,
|
|
sizeof(on)) < 0) {
|
|
g_gate_xlog("setsockopt() error: %s.", strerror(errno));
|
|
}
|
|
}
|
|
if (setsockopt(sfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on)) < 0)
|
|
g_gate_xlog("setsockopt(): %s.", strerror(errno));
|
|
bsize = rcvbuf;
|
|
if (setsockopt(sfd, SOL_SOCKET, SO_RCVBUF, &bsize, sizeof(bsize)) < 0)
|
|
g_gate_xlog("setsockopt(): %s.", strerror(errno));
|
|
bsize = sndbuf;
|
|
if (setsockopt(sfd, SOL_SOCKET, SO_SNDBUF, &bsize, sizeof(bsize)) < 0)
|
|
g_gate_xlog("setsockopt(): %s.", strerror(errno));
|
|
tv.tv_sec = 10;
|
|
tv.tv_usec = 0;
|
|
if (setsockopt(sfd, SOL_SOCKET, SO_SNDTIMEO, &tv, sizeof(tv)) ||
|
|
setsockopt(sfd, SOL_SOCKET, SO_RCVTIMEO, &tv, sizeof(tv)) < 0) {
|
|
g_gate_xlog("setsockopt() error: %s.", strerror(errno));
|
|
}
|
|
if (bind(sfd, (struct sockaddr *)&serv, sizeof(serv)) < 0)
|
|
g_gate_xlog("bind(): %s.", strerror(errno));
|
|
if (listen(sfd, 5) < 0)
|
|
g_gate_xlog("listen(): %s.", strerror(errno));
|
|
|
|
g_gate_log(LOG_INFO, "Listen on port: %d.", port);
|
|
|
|
signal(SIGHUP, huphandler);
|
|
|
|
for (;;) {
|
|
fromlen = sizeof(from);
|
|
tmpsfd = accept(sfd, &from, &fromlen);
|
|
if (tmpsfd < 0)
|
|
g_gate_xlog("accept(): %s.", strerror(errno));
|
|
|
|
if (got_sighup) {
|
|
got_sighup = 0;
|
|
exports_get();
|
|
}
|
|
|
|
if (exports_find(&from, NULL) == NULL) {
|
|
close(tmpsfd);
|
|
continue;
|
|
}
|
|
|
|
childpid = fork();
|
|
if (childpid < 0) {
|
|
g_gate_xlog("Cannot create child process: %s.",
|
|
strerror(errno));
|
|
} else if (childpid == 0) {
|
|
close(sfd);
|
|
serve(tmpsfd, &from);
|
|
/* NOTREACHED */
|
|
}
|
|
close(tmpsfd);
|
|
}
|
|
close(sfd);
|
|
exit(EXIT_SUCCESS);
|
|
}
|