392 lines
8.7 KiB
C
392 lines
8.7 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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* $FreeBSD$
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*/
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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 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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int e;
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e = errno;
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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(e));
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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(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(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(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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* Establish a TCP connection to the specified port on the specified host.
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*/
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int
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_fetch_connect(char *host, int port, int af, int verbose)
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{
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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, "\033[1m---> %s:%d\033[m\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 -1;
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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 -1;
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}
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return sd;
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}
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/*
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* Read a line of text from a socket 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(int fd, char **buf, size_t *size, 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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int r;
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char c;
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if (*buf == NULL) {
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if ((*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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*size = MIN_BUF_SIZE;
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}
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**buf = '\0';
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*len = 0;
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if (fetchTimeout) {
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gettimeofday(&timeout, NULL);
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timeout.tv_sec += fetchTimeout;
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FD_ZERO(&readfds);
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}
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do {
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if (fetchTimeout) {
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FD_SET(fd, &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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return -1;
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}
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r = select(fd+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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/* EBADF or EINVAL: shouldn't happen */
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return -1;
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}
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if (!FD_ISSET(fd, &readfds))
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continue;
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}
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r = read(fd, &c, 1);
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if (r == 0)
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break;
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if (r == -1) {
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if (errno == EINTR && fetchRestartCalls)
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continue;
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/* any other error is bad news */
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return -1;
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}
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(*buf)[*len] = c;
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*len += 1;
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if (*len == *size) {
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char *tmp;
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if ((tmp = realloc(*buf, *size * 2 + 1)) == NULL) {
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errno = ENOMEM;
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return -1;
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}
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*buf = tmp;
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*size = *size * 2 + 1;
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}
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} while (c != '\n');
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DEBUG(fprintf(stderr, "\033[1m<<< %.*s\033[m", (int)*len, *buf));
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return 0;
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}
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/*
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* Write a line of text to a socket w/ timeout
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* XXX currently does not enforce timeout
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*/
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int
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_fetch_putln(int fd, char *str, size_t len)
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{
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struct iovec iov[2];
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ssize_t wlen;
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/* XXX should enforce timeout */
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iov[0].iov_base = str;
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iov[0].iov_len = len;
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iov[1].iov_base = ENDL;
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iov[1].iov_len = sizeof ENDL;
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wlen = writev(fd, iov, 2);
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DEBUG(fprintf(stderr, "\033[1m>>> %s\n\033[m", str));
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return (wlen != len);
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}
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/*** Directory-related utility functions *************************************/
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int
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_fetch_add_entry(struct url_ent **p, int *size, int *len,
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char *name, struct url_stat *stat)
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{
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struct url_ent *tmp;
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if (*p == NULL) {
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#define INITIAL_SIZE 8
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if ((*p = malloc(INITIAL_SIZE * sizeof **p)) == NULL) {
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errno = ENOMEM;
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_fetch_syserr();
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return -1;
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}
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*size = INITIAL_SIZE;
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*len = 0;
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#undef INITIAL_SIZE
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}
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if (*len >= *size - 1) {
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tmp = realloc(*p, *size * 2 * sizeof **p);
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if (tmp == NULL) {
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errno = ENOMEM;
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_fetch_syserr();
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return -1;
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}
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*size *= 2;
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*p = tmp;
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}
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tmp = *p + *len;
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snprintf(tmp->name, MAXPATHLEN, "%s", name);
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bcopy(stat, &tmp->stat, sizeof *stat);
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(*len)++;
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(++tmp)->name[0] = 0;
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return 0;
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}
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