2761348f78
the SSL case, it is no different from the old _fetch_write(), but in the non-SSL case it uses writev(2) to send the entire vector as a single packet (provided it can fit in one packet). Implement _fetch_write() and _fetch_putln() in terms of _fetch_writev(). This should improve performance in the non-SSL case (by reducing protocol overhead) and solve the problem where too-smart-for-their-own-good firewalls reject FTP packets that do not end in CRLF. PR: bin/44123 Submitted by: fenner
609 lines
12 KiB
C
609 lines
12 KiB
C
/*-
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* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
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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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* in this position and unchanged.
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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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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#include <netinet/in.h>
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#include <errno.h>
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#include <netdb.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "fetch.h"
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#include "common.h"
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/*** Local data **************************************************************/
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/*
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* Error messages for resolver errors
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*/
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static struct fetcherr _netdb_errlist[] = {
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{ EAI_NODATA, FETCH_RESOLV, "Host not found" },
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{ EAI_AGAIN, FETCH_TEMP, "Transient resolver failure" },
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{ EAI_FAIL, FETCH_RESOLV, "Non-recoverable resolver failure" },
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{ EAI_NONAME, FETCH_RESOLV, "No address record" },
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{ -1, FETCH_UNKNOWN, "Unknown resolver error" }
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};
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/* End-of-Line */
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static const char ENDL[2] = "\r\n";
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/*** Error-reporting functions ***********************************************/
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/*
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* Map error code to string
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*/
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static struct fetcherr *
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_fetch_finderr(struct fetcherr *p, int e)
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{
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while (p->num != -1 && p->num != e)
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p++;
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return (p);
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}
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/*
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* Set error code
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*/
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void
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_fetch_seterr(struct fetcherr *p, int e)
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{
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p = _fetch_finderr(p, e);
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fetchLastErrCode = p->cat;
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snprintf(fetchLastErrString, MAXERRSTRING, "%s", p->string);
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}
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/*
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* Set error code according to errno
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*/
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void
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_fetch_syserr(void)
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{
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switch (errno) {
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case 0:
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fetchLastErrCode = FETCH_OK;
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break;
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case EPERM:
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case EACCES:
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case EROFS:
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case EAUTH:
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case ENEEDAUTH:
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fetchLastErrCode = FETCH_AUTH;
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break;
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case ENOENT:
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case EISDIR: /* XXX */
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fetchLastErrCode = FETCH_UNAVAIL;
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break;
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case ENOMEM:
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fetchLastErrCode = FETCH_MEMORY;
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break;
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case EBUSY:
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case EAGAIN:
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fetchLastErrCode = FETCH_TEMP;
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break;
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case EEXIST:
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fetchLastErrCode = FETCH_EXISTS;
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break;
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case ENOSPC:
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fetchLastErrCode = FETCH_FULL;
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break;
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case EADDRINUSE:
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case EADDRNOTAVAIL:
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case ENETDOWN:
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case ENETUNREACH:
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case ENETRESET:
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case EHOSTUNREACH:
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fetchLastErrCode = FETCH_NETWORK;
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break;
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case ECONNABORTED:
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case ECONNRESET:
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fetchLastErrCode = FETCH_ABORT;
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break;
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case ETIMEDOUT:
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fetchLastErrCode = FETCH_TIMEOUT;
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break;
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case ECONNREFUSED:
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case EHOSTDOWN:
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fetchLastErrCode = FETCH_DOWN;
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break;
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default:
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fetchLastErrCode = FETCH_UNKNOWN;
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}
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snprintf(fetchLastErrString, MAXERRSTRING, "%s", strerror(errno));
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}
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/*
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* Emit status message
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*/
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void
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_fetch_info(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fputc('\n', stderr);
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}
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/*** Network-related utility functions ***************************************/
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/*
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* Return the default port for a scheme
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*/
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int
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_fetch_default_port(const char *scheme)
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{
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struct servent *se;
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if ((se = getservbyname(scheme, "tcp")) != NULL)
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return (ntohs(se->s_port));
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if (strcasecmp(scheme, SCHEME_FTP) == 0)
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return (FTP_DEFAULT_PORT);
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if (strcasecmp(scheme, SCHEME_HTTP) == 0)
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return (HTTP_DEFAULT_PORT);
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return (0);
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}
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/*
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* Return the default proxy port for a scheme
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*/
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int
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_fetch_default_proxy_port(const char *scheme)
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{
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if (strcasecmp(scheme, SCHEME_FTP) == 0)
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return (FTP_DEFAULT_PROXY_PORT);
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if (strcasecmp(scheme, SCHEME_HTTP) == 0)
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return (HTTP_DEFAULT_PROXY_PORT);
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return (0);
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}
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/*
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* Create a connection for an existing descriptor.
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*/
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conn_t *
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_fetch_reopen(int sd)
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{
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conn_t *conn;
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/* allocate and fill connection structure */
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if ((conn = calloc(1, sizeof *conn)) == NULL)
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return (NULL);
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conn->sd = sd;
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++conn->ref;
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return (conn);
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}
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/*
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* Bump a connection's reference count.
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*/
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conn_t *
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_fetch_ref(conn_t *conn)
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{
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++conn->ref;
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return (conn);
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}
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/*
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* Establish a TCP connection to the specified port on the specified host.
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*/
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conn_t *
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_fetch_connect(const char *host, int port, int af, int verbose)
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{
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conn_t *conn;
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char pbuf[10];
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struct addrinfo hints, *res, *res0;
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int sd, err;
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DEBUG(fprintf(stderr, "---> %s:%d\n", host, port));
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if (verbose)
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_fetch_info("looking up %s", host);
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/* look up host name and set up socket address structure */
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snprintf(pbuf, sizeof(pbuf), "%d", port);
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memset(&hints, 0, sizeof(hints));
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hints.ai_family = af;
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_protocol = 0;
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if ((err = getaddrinfo(host, pbuf, &hints, &res0)) != 0) {
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_netdb_seterr(err);
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return (NULL);
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}
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if (verbose)
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_fetch_info("connecting to %s:%d", host, port);
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/* try to connect */
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for (sd = -1, res = res0; res; res = res->ai_next) {
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if ((sd = socket(res->ai_family, res->ai_socktype,
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res->ai_protocol)) == -1)
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continue;
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if (connect(sd, res->ai_addr, res->ai_addrlen) != -1)
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break;
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close(sd);
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sd = -1;
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}
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freeaddrinfo(res0);
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if (sd == -1) {
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_fetch_syserr();
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return (NULL);
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}
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if ((conn = _fetch_reopen(sd)) == NULL) {
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_fetch_syserr();
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close(sd);
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}
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return (conn);
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}
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/*
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* Enable SSL on a connection.
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*/
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int
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_fetch_ssl(conn_t *conn, int verbose)
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{
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#ifdef WITH_SSL
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/* Init the SSL library and context */
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if (!SSL_library_init()){
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fprintf(stderr, "SSL library init failed\n");
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return (-1);
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}
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SSL_load_error_strings();
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conn->ssl_meth = SSLv23_client_method();
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conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
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conn->ssl = SSL_new(conn->ssl_ctx);
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if (conn->ssl == NULL){
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fprintf(stderr, "SSL context creation failed\n");
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return (-1);
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}
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SSL_set_fd(conn->ssl, conn->sd);
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if (SSL_connect(conn->ssl) == -1){
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ERR_print_errors_fp(stderr);
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return (-1);
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}
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if (verbose) {
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X509_NAME *name;
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char *str;
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fprintf(stderr, "SSL connection established using %s\n",
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SSL_get_cipher(conn->ssl));
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conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
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name = X509_get_subject_name(conn->ssl_cert);
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str = X509_NAME_oneline(name, 0, 0);
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printf("Certificate subject: %s\n", str);
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free(str);
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name = X509_get_issuer_name(conn->ssl_cert);
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str = X509_NAME_oneline(name, 0, 0);
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printf("Certificate issuer: %s\n", str);
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free(str);
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}
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return (0);
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#else
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(void)conn;
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(void)verbose;
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fprintf(stderr, "SSL support disabled\n");
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return (-1);
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#endif
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}
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/*
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* Read a character from a connection w/ timeout
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*/
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ssize_t
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_fetch_read(conn_t *conn, char *buf, size_t len)
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{
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struct timeval now, timeout, wait;
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fd_set readfds;
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ssize_t rlen, total;
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int r;
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if (fetchTimeout) {
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FD_ZERO(&readfds);
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gettimeofday(&timeout, NULL);
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timeout.tv_sec += fetchTimeout;
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}
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total = 0;
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while (len > 0) {
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while (fetchTimeout && !FD_ISSET(conn->sd, &readfds)) {
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FD_SET(conn->sd, &readfds);
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gettimeofday(&now, NULL);
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wait.tv_sec = timeout.tv_sec - now.tv_sec;
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wait.tv_usec = timeout.tv_usec - now.tv_usec;
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if (wait.tv_usec < 0) {
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wait.tv_usec += 1000000;
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wait.tv_sec--;
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}
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if (wait.tv_sec < 0) {
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errno = ETIMEDOUT;
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_fetch_syserr();
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return (-1);
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}
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errno = 0;
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r = select(conn->sd + 1, &readfds, NULL, NULL, &wait);
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if (r == -1) {
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if (errno == EINTR && fetchRestartCalls)
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continue;
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_fetch_syserr();
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return (-1);
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}
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}
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#ifdef WITH_SSL
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if (conn->ssl != NULL)
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rlen = SSL_read(conn->ssl, buf, len);
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else
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#endif
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rlen = read(conn->sd, buf, len);
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if (rlen == 0) {
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/* we consider a short read a failure */
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errno = EPIPE;
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_fetch_syserr();
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return (-1);
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}
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if (rlen < 0) {
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if (errno == EINTR && fetchRestartCalls)
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continue;
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return (-1);
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}
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len -= rlen;
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buf += rlen;
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total += rlen;
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}
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return (total);
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}
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/*
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* Read a line of text from a connection w/ timeout
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*/
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#define MIN_BUF_SIZE 1024
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int
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_fetch_getln(conn_t *conn)
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{
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char *tmp;
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size_t tmpsize;
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char c;
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if (conn->buf == NULL) {
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if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
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errno = ENOMEM;
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return (-1);
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}
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conn->bufsize = MIN_BUF_SIZE;
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}
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conn->buf[0] = '\0';
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conn->buflen = 0;
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do {
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if (_fetch_read(conn, &c, 1) == -1)
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return (-1);
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conn->buf[conn->buflen++] = c;
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if (conn->buflen == conn->bufsize) {
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tmp = conn->buf;
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tmpsize = conn->bufsize * 2 + 1;
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if ((tmp = realloc(tmp, tmpsize)) == NULL) {
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errno = ENOMEM;
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return (-1);
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}
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conn->buf = tmp;
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conn->bufsize = tmpsize;
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}
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} while (c != '\n');
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conn->buf[conn->buflen] = '\0';
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DEBUG(fprintf(stderr, "<<< %s", conn->buf));
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return (0);
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}
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/*
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* Write to a connection w/ timeout
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*/
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ssize_t
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_fetch_write(conn_t *conn, const char *buf, size_t len)
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{
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struct iovec iov;
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iov.iov_base = (char *)buf;
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iov.iov_len = len;
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return _fetch_writev(conn, &iov, 1);
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}
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/*
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* Write a vector to a connection w/ timeout
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* Note: can modify the iovec.
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*/
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ssize_t
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_fetch_writev(conn_t *conn, struct iovec *iov, int iovcnt)
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{
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struct timeval now, timeout, wait;
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fd_set writefds;
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ssize_t wlen, total;
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int r;
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if (fetchTimeout) {
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FD_ZERO(&writefds);
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gettimeofday(&timeout, NULL);
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timeout.tv_sec += fetchTimeout;
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}
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total = 0;
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while (iovcnt > 0) {
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while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) {
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FD_SET(conn->sd, &writefds);
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gettimeofday(&now, NULL);
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wait.tv_sec = timeout.tv_sec - now.tv_sec;
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wait.tv_usec = timeout.tv_usec - now.tv_usec;
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if (wait.tv_usec < 0) {
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wait.tv_usec += 1000000;
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wait.tv_sec--;
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}
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if (wait.tv_sec < 0) {
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errno = ETIMEDOUT;
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_fetch_syserr();
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return (-1);
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}
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errno = 0;
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r = select(conn->sd + 1, NULL, &writefds, NULL, &wait);
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if (r == -1) {
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if (errno == EINTR && fetchRestartCalls)
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continue;
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return (-1);
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}
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}
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errno = 0;
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#ifdef WITH_SSL
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if (conn->ssl != NULL)
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wlen = SSL_write(conn->ssl,
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iov->iov_base, iov->iov_len);
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else
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#endif
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wlen = writev(conn->sd, iov, iovcnt);
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if (wlen == 0) {
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/* we consider a short write a failure */
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errno = EPIPE;
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_fetch_syserr();
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return (-1);
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}
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if (wlen < 0) {
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if (errno == EINTR && fetchRestartCalls)
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continue;
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return (-1);
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}
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total += wlen;
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while (iovcnt > 0 && wlen > iov->iov_len) {
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wlen -= iov->iov_len;
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iov++;
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iovcnt--;
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}
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if (iovcnt > 0) {
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iov->iov_len -= wlen;
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iov->iov_base += wlen;
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wlen = 0;
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}
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}
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return (total);
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}
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/*
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* Write a line of text to a connection w/ timeout
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*/
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int
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_fetch_putln(conn_t *conn, const char *str, size_t len)
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{
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struct iovec iov[2];
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DEBUG(fprintf(stderr, ">>> %s\n", str));
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iov[0].iov_base = (char *)str;
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iov[0].iov_len = len;
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iov[1].iov_base = (char *)ENDL;
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iov[1].iov_len = sizeof ENDL;
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if (_fetch_writev(conn, iov, 2) == -1)
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return (-1);
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|
return (0);
|
|
}
|
|
|
|
|
|
/*
|
|
* Close connection
|
|
*/
|
|
int
|
|
_fetch_close(conn_t *conn)
|
|
{
|
|
int ret;
|
|
|
|
if (--conn->ref > 0)
|
|
return (0);
|
|
ret = close(conn->sd);
|
|
free(conn);
|
|
return (ret);
|
|
}
|
|
|
|
|
|
/*** Directory-related utility functions *************************************/
|
|
|
|
int
|
|
_fetch_add_entry(struct url_ent **p, int *size, int *len,
|
|
const char *name, struct url_stat *us)
|
|
{
|
|
struct url_ent *tmp;
|
|
|
|
if (*p == NULL) {
|
|
*size = 0;
|
|
*len = 0;
|
|
}
|
|
|
|
if (*len >= *size - 1) {
|
|
tmp = realloc(*p, (*size * 2 + 1) * sizeof **p);
|
|
if (tmp == NULL) {
|
|
errno = ENOMEM;
|
|
_fetch_syserr();
|
|
return (-1);
|
|
}
|
|
*size = (*size * 2 + 1);
|
|
*p = tmp;
|
|
}
|
|
|
|
tmp = *p + *len;
|
|
snprintf(tmp->name, PATH_MAX, "%s", name);
|
|
bcopy(us, &tmp->stat, sizeof *us);
|
|
|
|
(*len)++;
|
|
(++tmp)->name[0] = 0;
|
|
|
|
return (0);
|
|
}
|