1237 lines
28 KiB
C
1237 lines
28 KiB
C
/* $NetBSD: common.c,v 1.31 2016/10/20 21:25:57 joerg Exp $ */
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/*-
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* Copyright (c) 1998-2004 Dag-Erling Coïdan Smørgrav
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* Copyright (c) 2008, 2010 Joerg Sonnenberger <joerg@NetBSD.org>
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* Copyright (c) 2020 Noel Kuntze <noel.kuntze@thermi.consulting>
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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: common.c,v 1.53 2007/12/19 00:26:36 des Exp $
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*/
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#include <poll.h>
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#include <sys/types.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 <arpa/inet.h>
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#include <ctype.h>
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#include <errno.h>
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#include <inttypes.h>
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#include <netdb.h>
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#include <pwd.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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/*** 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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#ifdef EAUTH
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case EAUTH:
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#endif
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#ifdef ENEEDAUTH
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case ENEEDAUTH:
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#endif
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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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uintmax_t
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fetch_parseuint(const char *str, const char **endptr, int radix, uintmax_t max)
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{
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uintmax_t val = 0, maxx = max / radix, d;
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const char *p;
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for (p = str; isxdigit((unsigned char)*p); p++) {
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unsigned char ch = (unsigned char)*p;
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if (isdigit(ch))
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d = ch - '0';
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else d = tolower(ch) - 'a' + 10;
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if (d > radix || val > maxx) goto err;
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val *= radix;
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if (val > max-d) goto err;
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val += d;
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}
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if (p == str || val > max) goto err;
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*endptr = p;
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return val;
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err:
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*endptr = "\xff";
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return 0;
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}
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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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if (strcasecmp(scheme, SCHEME_HTTPS) == 0)
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return (HTTPS_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->ftp_home = NULL;
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conn->cache_url = NULL;
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conn->next_buf = NULL;
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conn->next_len = 0;
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conn->sd = sd;
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conn->buf_events = POLLIN;
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return (conn);
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}
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/*
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* Bind a socket to a specific local address
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*/
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int
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fetch_bind(int sd, int af, const char *addr)
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{
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struct addrinfo hints, *res, *res0;
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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 (getaddrinfo(addr, NULL, &hints, &res0))
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return (-1);
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for (res = res0; res; res = res->ai_next) {
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if (bind(sd, res->ai_addr, res->ai_addrlen) == 0)
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return (0);
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}
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return (-1);
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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(struct url *cache_url, struct url *url, 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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const char *bindaddr;
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struct addrinfo hints, *res, *res0;
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int sd, error;
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if (verbose)
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fetch_info("looking up %s", url->host);
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/* look up host name and set up socket address structure */
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snprintf(pbuf, sizeof(pbuf), "%d", url->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 ((error = getaddrinfo(url->host, pbuf, &hints, &res0)) != 0) {
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netdb_seterr(error);
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return (NULL);
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}
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bindaddr = getenv("FETCH_BIND_ADDRESS");
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if (verbose)
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fetch_info("connecting to %s:%d", url->host, url->port);
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/* try to connect */
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for (sd = -1, res = res0; res; sd = -1, 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 (bindaddr != NULL && *bindaddr != '\0' &&
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fetch_bind(sd, res->ai_family, bindaddr) != 0) {
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fetch_info("failed to bind to '%s'", bindaddr);
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close(sd);
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continue;
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}
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if (connect(sd, res->ai_addr, res->ai_addrlen) == 0)
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break;
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close(sd);
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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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return (NULL);
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}
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conn->cache_url = fetchCopyURL(cache_url);
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conn->cache_af = af;
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return (conn);
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}
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static conn_t *connection_cache;
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static int cache_global_limit = 0;
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static int cache_per_host_limit = 0;
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/*
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* Initialise cache with the given limits.
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*/
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void
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fetchConnectionCacheInit(int global_limit, int per_host_limit)
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{
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if (global_limit < 0)
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cache_global_limit = INT_MAX;
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else if (per_host_limit > global_limit)
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cache_global_limit = per_host_limit;
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else
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cache_global_limit = global_limit;
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if (per_host_limit < 0)
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cache_per_host_limit = INT_MAX;
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else
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cache_per_host_limit = per_host_limit;
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}
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/*
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* Flush cache and free all associated resources.
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*/
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void
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fetchConnectionCacheClose(void)
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{
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conn_t *conn;
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while ((conn = connection_cache) != NULL) {
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connection_cache = conn->next_cached;
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(*conn->cache_close)(conn);
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}
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}
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/*
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* Check connection cache for an existing entry matching
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* protocol/host/port/user/password/family.
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*/
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conn_t *
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fetch_cache_get(const struct url *url, int af)
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{
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conn_t *conn, *last_conn = NULL;
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for (conn = connection_cache; conn; conn = conn->next_cached) {
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if (conn->cache_url->port == url->port &&
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strcmp(conn->cache_url->scheme, url->scheme) == 0 &&
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strcmp(conn->cache_url->host, url->host) == 0 &&
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strcmp(conn->cache_url->user, url->user) == 0 &&
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strcmp(conn->cache_url->pwd, url->pwd) == 0 &&
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(conn->cache_af == AF_UNSPEC || af == AF_UNSPEC ||
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conn->cache_af == af)) {
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if (last_conn != NULL)
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last_conn->next_cached = conn->next_cached;
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else
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connection_cache = conn->next_cached;
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return conn;
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}
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}
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return NULL;
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}
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/*
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* Put the connection back into the cache for reuse.
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* If the connection is freed due to LRU or if the cache
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* is explicitly closed, the given callback is called.
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*/
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void
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fetch_cache_put(conn_t *conn, int (*closecb)(conn_t *))
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{
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conn_t *iter, *last, *next_cached;
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int global_count, host_count;
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if (conn->cache_url == NULL || cache_global_limit == 0) {
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(*closecb)(conn);
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return;
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}
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global_count = host_count = 0;
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last = NULL;
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for (iter = connection_cache; iter; last = iter, iter = next_cached) {
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next_cached = iter->next_cached;
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++global_count;
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if (strcmp(conn->cache_url->host, iter->cache_url->host) == 0)
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++host_count;
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if (global_count < cache_global_limit &&
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host_count < cache_per_host_limit)
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continue;
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--global_count;
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if (last != NULL)
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last->next_cached = iter->next_cached;
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else
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connection_cache = iter->next_cached;
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(*iter->cache_close)(iter);
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}
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conn->cache_close = closecb;
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conn->next_cached = connection_cache;
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connection_cache = conn;
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}
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/*
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* Configure peer verification based on environment:
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* 1. If compile time #define CA_CERT_FILE is set, and it exists, use it.
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* 2. Use system default CA store settings.
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*/
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static int fetch_ssl_setup_peer_verification(SSL_CTX *ctx, int verbose)
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{
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const char *ca_file = NULL;
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#ifdef CA_CERT_FILE
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if (access(CA_CERT_FILE, R_OK) == 0) {
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ca_file = CA_CERT_FILE;
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#ifdef CA_CRL_FILE
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if (access(CA_CRL_FILE, R_OK) == 0) {
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X509_STORE *crl_store = SSL_CTX_get_cert_store(ctx);
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X509_LOOKUP *crl_lookup = X509_STORE_add_lookup(crl_store, X509_LOOKUP_file());
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if (!crl_lookup || !X509_load_crl_file(crl_lookup, CA_CRL_FILE, X509_FILETYPE_PEM)) {
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fprintf(stderr, "Could not load CRL file %s\n", CA_CRL_FILE);
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return 0;
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}
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X509_STORE_set_flags(crl_store, X509_V_FLAG_CRL_CHECK | X509_V_FLAG_CRL_CHECK_ALL);
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}
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#endif
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}
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#endif
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if (ca_file)
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SSL_CTX_load_verify_locations(ctx, ca_file, NULL);
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else
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SSL_CTX_set_default_verify_paths(ctx);
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SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, 0);
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return 1;
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}
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|
|
/*
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* Configure client certificate based on environment:
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* 1. Use SSL_CLIENT_{CERT,KEY}_FILE environment variables if set
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* 2. Use compile time set CLIENT_{CERT,KEY}_FILE #define's if set
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* 3. No client certificate used
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*
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* If the key file is not specified, it is assumed that the certificate
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* file is a .pem file containing both the cert and the key.
|
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*/
|
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static int fetch_ssl_setup_client_certificate(SSL_CTX *ctx, int verbose)
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{
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const char *cert_file = NULL, *key_file = NULL;
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|
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cert_file = getenv("SSL_CLIENT_CERT_FILE");
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if (cert_file) key_file = getenv("SSL_CLIENT_KEY_FILE");
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|
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#ifdef CLIENT_CERT_FILE
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if (!cert_file && access(CLIENT_CERT_FILE, R_OK) == 0) {
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cert_file = CLIENT_CERT_FILE;
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#ifdef CLIENT_KEY_FILE
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if (access(CLIENT_KEY_FILE, R_OK) == 0)
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key_file = CLIENT_KEY_FILE;
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#endif
|
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}
|
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#endif
|
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if (!cert_file) return 1;
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if (!key_file) key_file = cert_file;
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|
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if (verbose) {
|
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fetch_info("Using client cert file: %s", cert_file);
|
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fetch_info("Using client key file: %s", key_file);
|
|
}
|
|
|
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if (SSL_CTX_use_certificate_chain_file(ctx, cert_file) != 1) {
|
|
fprintf(stderr, "Could not load client certificate %s\n",
|
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cert_file);
|
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return 0;
|
|
}
|
|
|
|
if (SSL_CTX_use_PrivateKey_file(ctx, key_file, SSL_FILETYPE_PEM) != 1) {
|
|
fprintf(stderr, "Could not load client key %s\n", key_file);
|
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return 0;
|
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}
|
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|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Enable SSL on a connection.
|
|
*/
|
|
int
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fetch_ssl(conn_t *conn, const struct url *URL, int verbose)
|
|
{
|
|
#if OPENSSL_VERSION_NUMBER < 0x10100000L
|
|
conn->ssl_meth = SSLv23_client_method();
|
|
#else
|
|
conn->ssl_meth = TLS_client_method();
|
|
#endif
|
|
conn->ssl_ctx = SSL_CTX_new(conn->ssl_meth);
|
|
SSL_CTX_set_mode(conn->ssl_ctx, SSL_MODE_AUTO_RETRY);
|
|
|
|
if (!fetch_ssl_setup_peer_verification(conn->ssl_ctx, verbose))
|
|
return (-1);
|
|
if (!fetch_ssl_setup_client_certificate(conn->ssl_ctx, verbose))
|
|
return (-1);
|
|
|
|
conn->ssl = SSL_new(conn->ssl_ctx);
|
|
if (conn->ssl == NULL){
|
|
fprintf(stderr, "SSL context creation failed\n");
|
|
return (-1);
|
|
}
|
|
conn->buf_events = 0;
|
|
SSL_set_fd(conn->ssl, conn->sd);
|
|
if (!SSL_set_tlsext_host_name(conn->ssl, (char *)(uintptr_t)URL->host)) {
|
|
fprintf(stderr,
|
|
"TLS server name indication extension failed for host %s\n",
|
|
URL->host);
|
|
return (-1);
|
|
}
|
|
|
|
if (SSL_connect(conn->ssl) == -1){
|
|
ERR_print_errors_fp(stderr);
|
|
return (-1);
|
|
}
|
|
|
|
conn->ssl_cert = SSL_get_peer_certificate(conn->ssl);
|
|
if (!conn->ssl_cert) {
|
|
fprintf(stderr, "No server SSL certificate\n");
|
|
return -1;
|
|
}
|
|
|
|
if (getenv("SSL_NO_VERIFY_HOSTNAME") == NULL) {
|
|
if (verbose)
|
|
fetch_info("Verify hostname");
|
|
if (X509_check_host(conn->ssl_cert, URL->host, strlen(URL->host),
|
|
X509_CHECK_FLAG_NO_PARTIAL_WILDCARDS,
|
|
NULL) != 1) {
|
|
fprintf(stderr, "SSL certificate subject doesn't match host %s\n",
|
|
URL->host);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (verbose) {
|
|
X509_NAME *name;
|
|
char *str;
|
|
|
|
fetch_info("SSL connection established using %s\n", SSL_get_cipher(conn->ssl));
|
|
name = X509_get_subject_name(conn->ssl_cert);
|
|
str = X509_NAME_oneline(name, 0, 0);
|
|
fetch_info("Certificate subject: %s", str);
|
|
free(str);
|
|
name = X509_get_issuer_name(conn->ssl_cert);
|
|
str = X509_NAME_oneline(name, 0, 0);
|
|
fetch_info("Certificate issuer: %s", str);
|
|
free(str);
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
compute_timeout(const struct timeval *tv)
|
|
{
|
|
struct timeval cur;
|
|
int timeout;
|
|
|
|
gettimeofday(&cur, NULL);
|
|
timeout = (tv->tv_sec - cur.tv_sec) * 1000 + (tv->tv_usec - cur.tv_usec) / 1000;
|
|
return timeout;
|
|
}
|
|
|
|
/*
|
|
* Read a character from a connection w/ timeout
|
|
*/
|
|
ssize_t
|
|
fetch_read(conn_t *conn, char *buf, size_t len)
|
|
{
|
|
struct timeval timeout_end;
|
|
struct pollfd pfd;
|
|
int timeout_cur;
|
|
ssize_t rlen;
|
|
int r;
|
|
|
|
if (len == 0)
|
|
return 0;
|
|
|
|
if (conn->next_len != 0) {
|
|
if (conn->next_len < len)
|
|
len = conn->next_len;
|
|
memmove(buf, conn->next_buf, len);
|
|
conn->next_len -= len;
|
|
conn->next_buf += len;
|
|
return len;
|
|
}
|
|
|
|
if (fetchTimeout) {
|
|
gettimeofday(&timeout_end, NULL);
|
|
timeout_end.tv_sec += fetchTimeout;
|
|
}
|
|
|
|
pfd.fd = conn->sd;
|
|
for (;;) {
|
|
pfd.events = conn->buf_events;
|
|
if (fetchTimeout && pfd.events) {
|
|
do {
|
|
timeout_cur = compute_timeout(&timeout_end);
|
|
if (timeout_cur < 0) {
|
|
errno = ETIMEDOUT;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
errno = 0;
|
|
r = poll(&pfd, 1, timeout_cur);
|
|
if (r == -1) {
|
|
if (errno == EINTR && fetchRestartCalls)
|
|
continue;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
} while (pfd.revents == 0);
|
|
}
|
|
|
|
if (conn->ssl != NULL) {
|
|
rlen = SSL_read(conn->ssl, buf, len);
|
|
if (rlen == -1) {
|
|
switch (SSL_get_error(conn->ssl, rlen)) {
|
|
case SSL_ERROR_WANT_READ:
|
|
conn->buf_events = POLLIN;
|
|
break;
|
|
case SSL_ERROR_WANT_WRITE:
|
|
conn->buf_events = POLLOUT;
|
|
break;
|
|
default:
|
|
errno = EIO;
|
|
fetch_syserr();
|
|
return -1;
|
|
}
|
|
} else {
|
|
/* Assume buffering on the SSL layer. */
|
|
conn->buf_events = 0;
|
|
}
|
|
} else {
|
|
rlen = read(conn->sd, buf, len);
|
|
}
|
|
if (rlen >= 0)
|
|
break;
|
|
|
|
if (errno != EINTR || !fetchRestartCalls)
|
|
return (-1);
|
|
}
|
|
return (rlen);
|
|
}
|
|
|
|
|
|
/*
|
|
* Read a line of text from a connection w/ timeout
|
|
*/
|
|
#define MIN_BUF_SIZE 1024
|
|
|
|
int
|
|
fetch_getln(conn_t *conn)
|
|
{
|
|
char *tmp, *next;
|
|
size_t tmpsize;
|
|
ssize_t len;
|
|
|
|
if (conn->buf == NULL) {
|
|
if ((conn->buf = malloc(MIN_BUF_SIZE)) == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
conn->bufsize = MIN_BUF_SIZE;
|
|
}
|
|
|
|
conn->buflen = 0;
|
|
next = NULL;
|
|
|
|
do {
|
|
/*
|
|
* conn->bufsize != conn->buflen at this point,
|
|
* so the buffer can be NUL-terminated below for
|
|
* the case of len == 0.
|
|
*/
|
|
len = fetch_read(conn, conn->buf + conn->buflen,
|
|
conn->bufsize - conn->buflen);
|
|
if (len == -1)
|
|
return (-1);
|
|
if (len == 0)
|
|
break;
|
|
next = memchr(conn->buf + conn->buflen, '\n', len);
|
|
conn->buflen += len;
|
|
if (conn->buflen == conn->bufsize && next == NULL) {
|
|
tmp = conn->buf;
|
|
tmpsize = conn->bufsize * 2;
|
|
if (tmpsize < conn->bufsize) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
if ((tmp = realloc(tmp, tmpsize)) == NULL) {
|
|
errno = ENOMEM;
|
|
return (-1);
|
|
}
|
|
conn->buf = tmp;
|
|
conn->bufsize = tmpsize;
|
|
}
|
|
} while (next == NULL);
|
|
|
|
if (next != NULL) {
|
|
*next = '\0';
|
|
conn->next_buf = next + 1;
|
|
conn->next_len = conn->buflen - (conn->next_buf - conn->buf);
|
|
conn->buflen = next - conn->buf;
|
|
} else {
|
|
conn->buf[conn->buflen] = '\0';
|
|
conn->next_len = 0;
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Write a vector to a connection w/ timeout
|
|
* Note: can modify the iovec.
|
|
*/
|
|
ssize_t
|
|
fetch_write(conn_t *conn, const void *buf, size_t len)
|
|
{
|
|
struct timeval now, timeout, waittv;
|
|
fd_set writefds;
|
|
ssize_t wlen, total;
|
|
int r;
|
|
|
|
if (fetchTimeout) {
|
|
FD_ZERO(&writefds);
|
|
gettimeofday(&timeout, NULL);
|
|
timeout.tv_sec += fetchTimeout;
|
|
}
|
|
|
|
total = 0;
|
|
while (len) {
|
|
while (fetchTimeout && !FD_ISSET(conn->sd, &writefds)) {
|
|
FD_SET(conn->sd, &writefds);
|
|
gettimeofday(&now, NULL);
|
|
waittv.tv_sec = timeout.tv_sec - now.tv_sec;
|
|
waittv.tv_usec = timeout.tv_usec - now.tv_usec;
|
|
if (waittv.tv_usec < 0) {
|
|
waittv.tv_usec += 1000000;
|
|
waittv.tv_sec--;
|
|
}
|
|
if (waittv.tv_sec < 0) {
|
|
errno = ETIMEDOUT;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
errno = 0;
|
|
r = select(conn->sd + 1, NULL, &writefds, NULL, &waittv);
|
|
if (r == -1) {
|
|
if (errno == EINTR && fetchRestartCalls)
|
|
continue;
|
|
return (-1);
|
|
}
|
|
}
|
|
errno = 0;
|
|
if (conn->ssl != NULL)
|
|
wlen = SSL_write(conn->ssl, buf, len);
|
|
else
|
|
wlen = send(conn->sd, buf, len, MSG_NOSIGNAL);
|
|
if (wlen == 0) {
|
|
/* we consider a short write a failure */
|
|
errno = EPIPE;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
if (wlen < 0) {
|
|
if (errno == EINTR && fetchRestartCalls)
|
|
continue;
|
|
return (-1);
|
|
}
|
|
total += wlen;
|
|
buf = (const char *)buf + wlen;
|
|
len -= wlen;
|
|
}
|
|
return (total);
|
|
}
|
|
|
|
|
|
/*
|
|
* Close connection
|
|
*/
|
|
int
|
|
fetch_close(conn_t *conn)
|
|
{
|
|
int ret;
|
|
|
|
if (conn->ssl) {
|
|
SSL_shutdown(conn->ssl);
|
|
SSL_set_connect_state(conn->ssl);
|
|
SSL_free(conn->ssl);
|
|
}
|
|
if (conn->ssl_ctx) {
|
|
SSL_CTX_free(conn->ssl_ctx);
|
|
}
|
|
if (conn->ssl_cert) {
|
|
X509_free(conn->ssl_cert);
|
|
}
|
|
|
|
ret = close(conn->sd);
|
|
if (conn->cache_url)
|
|
fetchFreeURL(conn->cache_url);
|
|
free(conn->ftp_home);
|
|
free(conn->buf);
|
|
free(conn);
|
|
return (ret);
|
|
}
|
|
|
|
|
|
/*** Directory-related utility functions *************************************/
|
|
|
|
int
|
|
fetch_add_entry(struct url_list *ue, struct url *base, const char *name,
|
|
int pre_quoted)
|
|
{
|
|
struct url *tmp;
|
|
char *tmp_name;
|
|
size_t base_doc_len, name_len, i;
|
|
unsigned char c;
|
|
|
|
if (strchr(name, '/') != NULL ||
|
|
strcmp(name, "..") == 0 ||
|
|
strcmp(name, ".") == 0)
|
|
return 0;
|
|
|
|
if (strcmp(base->doc, "/") == 0)
|
|
base_doc_len = 0;
|
|
else
|
|
base_doc_len = strlen(base->doc);
|
|
|
|
name_len = 1;
|
|
for (i = 0; name[i] != '\0'; ++i) {
|
|
if ((!pre_quoted && name[i] == '%') ||
|
|
!fetch_urlpath_safe(name[i]))
|
|
name_len += 3;
|
|
else
|
|
++name_len;
|
|
}
|
|
|
|
tmp_name = malloc( base_doc_len + name_len + 1);
|
|
if (tmp_name == NULL) {
|
|
errno = ENOMEM;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
|
|
if (ue->length + 1 >= ue->alloc_size) {
|
|
tmp = realloc(ue->urls, (ue->alloc_size * 2 + 1) * sizeof(*tmp));
|
|
if (tmp == NULL) {
|
|
free(tmp_name);
|
|
errno = ENOMEM;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
ue->alloc_size = ue->alloc_size * 2 + 1;
|
|
ue->urls = tmp;
|
|
}
|
|
|
|
tmp = ue->urls + ue->length;
|
|
strcpy(tmp->scheme, base->scheme);
|
|
strcpy(tmp->user, base->user);
|
|
strcpy(tmp->pwd, base->pwd);
|
|
strcpy(tmp->host, base->host);
|
|
tmp->port = base->port;
|
|
tmp->doc = tmp_name;
|
|
memcpy(tmp->doc, base->doc, base_doc_len);
|
|
tmp->doc[base_doc_len] = '/';
|
|
|
|
for (i = base_doc_len + 1; *name != '\0'; ++name) {
|
|
if ((!pre_quoted && *name == '%') ||
|
|
!fetch_urlpath_safe(*name)) {
|
|
tmp->doc[i++] = '%';
|
|
c = (unsigned char)*name / 16;
|
|
if (c < 10)
|
|
tmp->doc[i++] = '0' + c;
|
|
else
|
|
tmp->doc[i++] = 'a' - 10 + c;
|
|
c = (unsigned char)*name % 16;
|
|
if (c < 10)
|
|
tmp->doc[i++] = '0' + c;
|
|
else
|
|
tmp->doc[i++] = 'a' - 10 + c;
|
|
} else {
|
|
tmp->doc[i++] = *name;
|
|
}
|
|
}
|
|
tmp->doc[i] = '\0';
|
|
|
|
tmp->offset = 0;
|
|
tmp->length = 0;
|
|
tmp->last_modified = -1;
|
|
|
|
++ue->length;
|
|
|
|
return (0);
|
|
}
|
|
|
|
void
|
|
fetchInitURLList(struct url_list *ue)
|
|
{
|
|
ue->length = ue->alloc_size = 0;
|
|
ue->urls = NULL;
|
|
}
|
|
|
|
int
|
|
fetchAppendURLList(struct url_list *dst, const struct url_list *src)
|
|
{
|
|
size_t i, j, len;
|
|
|
|
len = dst->length + src->length;
|
|
if (len > dst->alloc_size) {
|
|
struct url *tmp;
|
|
|
|
tmp = realloc(dst->urls, len * sizeof(*tmp));
|
|
if (tmp == NULL) {
|
|
errno = ENOMEM;
|
|
fetch_syserr();
|
|
return (-1);
|
|
}
|
|
dst->alloc_size = len;
|
|
dst->urls = tmp;
|
|
}
|
|
|
|
for (i = 0, j = dst->length; i < src->length; ++i, ++j) {
|
|
dst->urls[j] = src->urls[i];
|
|
dst->urls[j].doc = strdup(src->urls[i].doc);
|
|
if (dst->urls[j].doc == NULL) {
|
|
while (i-- > 0)
|
|
free(dst->urls[j].doc);
|
|
fetch_syserr();
|
|
return -1;
|
|
}
|
|
}
|
|
dst->length = len;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fetchFreeURLList(struct url_list *ue)
|
|
{
|
|
size_t i;
|
|
|
|
for (i = 0; i < ue->length; ++i)
|
|
free(ue->urls[i].doc);
|
|
free(ue->urls);
|
|
ue->length = ue->alloc_size = 0;
|
|
}
|
|
|
|
|
|
/*** Authentication-related utility functions ********************************/
|
|
|
|
static const char *
|
|
fetch_read_word(FILE *f)
|
|
{
|
|
static char word[1024];
|
|
|
|
if (fscanf(f, " %1023s ", word) != 1)
|
|
return (NULL);
|
|
return (word);
|
|
}
|
|
|
|
/*
|
|
* Get authentication data for a URL from .netrc
|
|
*/
|
|
int
|
|
fetch_netrc_auth(struct url *url)
|
|
{
|
|
char fn[PATH_MAX];
|
|
const char *word;
|
|
char *p;
|
|
FILE *f;
|
|
|
|
if ((p = getenv("NETRC")) != NULL) {
|
|
if (snprintf(fn, sizeof(fn), "%s", p) >= (int)sizeof(fn)) {
|
|
fetch_info("$NETRC specifies a file name "
|
|
"longer than PATH_MAX");
|
|
return (-1);
|
|
}
|
|
} else {
|
|
if ((p = getenv("HOME")) != NULL) {
|
|
struct passwd *pwd;
|
|
|
|
if ((pwd = getpwuid(getuid())) == NULL ||
|
|
(p = pwd->pw_dir) == NULL)
|
|
return (-1);
|
|
}
|
|
if (snprintf(fn, sizeof(fn), "%s/.netrc", p) >= (int)sizeof(fn))
|
|
return (-1);
|
|
}
|
|
|
|
if ((f = fopen(fn, "r")) == NULL)
|
|
return (-1);
|
|
while ((word = fetch_read_word(f)) != NULL) {
|
|
if (strcmp(word, "default") == 0)
|
|
break;
|
|
if (strcmp(word, "machine") == 0 &&
|
|
(word = fetch_read_word(f)) != NULL &&
|
|
strcasecmp(word, url->host) == 0) {
|
|
break;
|
|
}
|
|
}
|
|
if (word == NULL)
|
|
goto ferr;
|
|
while ((word = fetch_read_word(f)) != NULL) {
|
|
if (strcmp(word, "login") == 0) {
|
|
if ((word = fetch_read_word(f)) == NULL)
|
|
goto ferr;
|
|
if (snprintf(url->user, sizeof(url->user),
|
|
"%s", word) > (int)sizeof(url->user)) {
|
|
fetch_info("login name in .netrc is too long");
|
|
url->user[0] = '\0';
|
|
}
|
|
} else if (strcmp(word, "password") == 0) {
|
|
if ((word = fetch_read_word(f)) == NULL)
|
|
goto ferr;
|
|
if (snprintf(url->pwd, sizeof(url->pwd),
|
|
"%s", word) > (int)sizeof(url->pwd)) {
|
|
fetch_info("password in .netrc is too long");
|
|
url->pwd[0] = '\0';
|
|
}
|
|
} else if (strcmp(word, "account") == 0) {
|
|
if ((word = fetch_read_word(f)) == NULL)
|
|
goto ferr;
|
|
/* XXX not supported! */
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
fclose(f);
|
|
return (0);
|
|
ferr:
|
|
fclose(f);
|
|
return (-1);
|
|
}
|
|
|
|
#define MAX_ADDRESS_BYTES sizeof(struct in6_addr)
|
|
#define MAX_ADDRESS_STRING (4*8+1)
|
|
#define MAX_CIDR_STRING (MAX_ADDRESS_STRING+4)
|
|
|
|
static size_t host_to_address(uint8_t *buf, size_t buf_len, const char *host, size_t len)
|
|
{
|
|
char tmp[MAX_ADDRESS_STRING];
|
|
|
|
if (len >= sizeof tmp) return 0;
|
|
if (buf_len < sizeof(struct in6_addr)) return 0;
|
|
|
|
/* Make zero terminated copy of the hostname */
|
|
memcpy(tmp, host, len);
|
|
tmp[len] = 0;
|
|
|
|
if (inet_pton(AF_INET, tmp, (struct in_addr *) buf))
|
|
return sizeof(struct in_addr);
|
|
if (inet_pton(AF_INET6, tmp, (struct in6_addr *) buf))
|
|
return sizeof(struct in6_addr);
|
|
return 0;
|
|
}
|
|
|
|
static int bitcmp(const uint8_t *a, const uint8_t *b, int len)
|
|
{
|
|
int bytes, bits, mask, r;
|
|
|
|
bytes = len / 8;
|
|
bits = len % 8;
|
|
if (bytes != 0) {
|
|
r = memcmp(a, b, bytes);
|
|
if (r != 0) return r;
|
|
}
|
|
if (bits != 0) {
|
|
mask = (0xff << (8 - bits)) & 0xff;
|
|
return ((int) (a[bytes] & mask)) - ((int) (b[bytes] & mask));
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int cidr_match(const uint8_t *addr, size_t addr_len, const char *cidr, size_t cidr_len)
|
|
{
|
|
const char *slash;
|
|
uint8_t cidr_addr[MAX_ADDRESS_BYTES];
|
|
size_t cidr_addrlen;
|
|
long bits;
|
|
|
|
if (!addr_len || cidr_len > MAX_CIDR_STRING) return 0;
|
|
slash = memchr(cidr, '/', cidr_len);
|
|
if (!slash) return 0;
|
|
bits = strtol(slash + 1, NULL, 10);
|
|
if (!bits || bits > 128) return 0;
|
|
|
|
cidr_addrlen = host_to_address(cidr_addr, sizeof cidr_addr, cidr, slash - cidr);
|
|
if (cidr_addrlen != addr_len || bits > addr_len*8) return 0;
|
|
return bitcmp(cidr_addr, addr, bits) == 0;
|
|
}
|
|
|
|
/*
|
|
* The no_proxy environment variable specifies a set of domains for
|
|
* which the proxy should not be consulted; the contents is a comma-,
|
|
* or space-separated list of domain names. A single asterisk will
|
|
* override all proxy variables and no transactions will be proxied
|
|
* (for compatability with lynx and curl, see the discussion at
|
|
* <http://curl.haxx.se/mail/archive_pre_oct_99/0009.html>).
|
|
*/
|
|
int
|
|
fetch_no_proxy_match(const char *host)
|
|
{
|
|
const char *no_proxy, *p, *q;
|
|
uint8_t addr[MAX_ADDRESS_BYTES];
|
|
size_t h_len, d_len, addr_len;
|
|
|
|
if ((no_proxy = getenv("NO_PROXY")) == NULL &&
|
|
(no_proxy = getenv("no_proxy")) == NULL)
|
|
return (0);
|
|
|
|
/* asterisk matches any hostname */
|
|
if (strcmp(no_proxy, "*") == 0)
|
|
return (1);
|
|
|
|
h_len = strlen(host);
|
|
addr_len = host_to_address(addr, sizeof addr, host, h_len);
|
|
p = no_proxy;
|
|
do {
|
|
/* position p at the beginning of a domain suffix */
|
|
while (*p == ',' || isspace((unsigned char)*p))
|
|
p++;
|
|
|
|
/* position q at the first separator character */
|
|
for (q = p; *q; ++q)
|
|
if (*q == ',' || isspace((unsigned char)*q))
|
|
break;
|
|
|
|
d_len = q - p;
|
|
if (d_len > 0 && h_len >= d_len &&
|
|
strncasecmp(host + h_len - d_len,
|
|
p, d_len) == 0) {
|
|
/* domain name matches */
|
|
return (1);
|
|
}
|
|
|
|
if (cidr_match(addr, addr_len, p, d_len)) {
|
|
return (1);
|
|
}
|
|
|
|
p = q + 1;
|
|
} while (*q);
|
|
|
|
return (0);
|
|
}
|
|
|
|
struct fetchIO {
|
|
void *io_cookie;
|
|
ssize_t (*io_read)(void *, void *, size_t);
|
|
ssize_t (*io_write)(void *, const void *, size_t);
|
|
void (*io_close)(void *);
|
|
};
|
|
|
|
void
|
|
fetchIO_close(fetchIO *f)
|
|
{
|
|
if (f->io_close != NULL)
|
|
(*f->io_close)(f->io_cookie);
|
|
|
|
free(f);
|
|
}
|
|
|
|
fetchIO *
|
|
fetchIO_unopen(void *io_cookie, ssize_t (*io_read)(void *, void *, size_t),
|
|
ssize_t (*io_write)(void *, const void *, size_t),
|
|
void (*io_close)(void *))
|
|
{
|
|
fetchIO *f;
|
|
|
|
f = malloc(sizeof(*f));
|
|
if (f == NULL)
|
|
return f;
|
|
|
|
f->io_cookie = io_cookie;
|
|
f->io_read = io_read;
|
|
f->io_write = io_write;
|
|
f->io_close = io_close;
|
|
|
|
return f;
|
|
}
|
|
|
|
ssize_t
|
|
fetchIO_read(fetchIO *f, void *buf, size_t len)
|
|
{
|
|
if (f->io_read == NULL)
|
|
return EBADF;
|
|
return (*f->io_read)(f->io_cookie, buf, len);
|
|
}
|
|
|
|
ssize_t
|
|
fetchIO_write(fetchIO *f, const void *buf, size_t len)
|
|
{
|
|
if (f->io_read == NULL)
|
|
return EBADF;
|
|
return (*f->io_write)(f->io_cookie, buf, len);
|
|
}
|