266 lines
7.2 KiB
C
266 lines
7.2 KiB
C
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/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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#include "curl_setup.h"
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#ifndef CURL_DISABLE_PROXY
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#include "inet_pton.h"
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#include "strcase.h"
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#include "noproxy.h"
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#ifdef HAVE_NETINET_IN_H
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#include <netinet/in.h>
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#endif
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#ifdef HAVE_ARPA_INET_H
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#include <arpa/inet.h>
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#endif
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/*
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* Curl_cidr4_match() returns TRUE if the given IPv4 address is within the
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* specified CIDR address range.
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*/
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UNITTEST bool Curl_cidr4_match(const char *ipv4, /* 1.2.3.4 address */
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const char *network, /* 1.2.3.4 address */
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unsigned int bits)
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{
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unsigned int address = 0;
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unsigned int check = 0;
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if(bits > 32)
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/* strange input */
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return FALSE;
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if(1 != Curl_inet_pton(AF_INET, ipv4, &address))
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return FALSE;
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if(1 != Curl_inet_pton(AF_INET, network, &check))
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return FALSE;
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if(bits && (bits != 32)) {
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unsigned int mask = 0xffffffff << (32 - bits);
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unsigned int haddr = htonl(address);
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unsigned int hcheck = htonl(check);
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#if 0
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fprintf(stderr, "Host %s (%x) network %s (%x) bits %u mask %x => %x\n",
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ipv4, haddr, network, hcheck, bits, mask,
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(haddr ^ hcheck) & mask);
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#endif
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if((haddr ^ hcheck) & mask)
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return FALSE;
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return TRUE;
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}
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return (address == check);
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}
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UNITTEST bool Curl_cidr6_match(const char *ipv6,
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const char *network,
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unsigned int bits)
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{
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#ifdef ENABLE_IPV6
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int bytes;
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int rest;
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unsigned char address[16];
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unsigned char check[16];
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if(!bits)
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bits = 128;
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bytes = bits/8;
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rest = bits & 0x07;
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if(1 != Curl_inet_pton(AF_INET6, ipv6, address))
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return FALSE;
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if(1 != Curl_inet_pton(AF_INET6, network, check))
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return FALSE;
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if((bytes > 16) || ((bytes == 16) && rest))
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return FALSE;
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if(bytes && memcmp(address, check, bytes))
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return FALSE;
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if(rest && !((address[bytes] ^ check[bytes]) & (0xff << (8 - rest))))
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return FALSE;
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return TRUE;
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#else
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(void)ipv6;
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(void)network;
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(void)bits;
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return FALSE;
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#endif
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}
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enum nametype {
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TYPE_HOST,
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TYPE_IPV4,
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TYPE_IPV6
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};
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/****************************************************************
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* Checks if the host is in the noproxy list. returns TRUE if it matches and
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* therefore the proxy should NOT be used.
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****************************************************************/
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bool Curl_check_noproxy(const char *name, const char *no_proxy,
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bool *spacesep)
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{
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char hostip[128];
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*spacesep = FALSE;
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/*
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* If we don't have a hostname at all, like for example with a FILE
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* transfer, we have nothing to interrogate the noproxy list with.
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*/
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if(!name || name[0] == '\0')
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return FALSE;
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/* no_proxy=domain1.dom,host.domain2.dom
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* (a comma-separated list of hosts which should
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* not be proxied, or an asterisk to override
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* all proxy variables)
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*/
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if(no_proxy && no_proxy[0]) {
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const char *p = no_proxy;
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size_t namelen;
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enum nametype type = TYPE_HOST;
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if(!strcmp("*", no_proxy))
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return TRUE;
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/* NO_PROXY was specified and it wasn't just an asterisk */
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if(name[0] == '[') {
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char *endptr;
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/* IPv6 numerical address */
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endptr = strchr(name, ']');
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if(!endptr)
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return FALSE;
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name++;
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namelen = endptr - name;
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if(namelen >= sizeof(hostip))
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return FALSE;
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memcpy(hostip, name, namelen);
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hostip[namelen] = 0;
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name = hostip;
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type = TYPE_IPV6;
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}
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else {
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unsigned int address;
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namelen = strlen(name);
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if(1 == Curl_inet_pton(AF_INET, name, &address))
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type = TYPE_IPV4;
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else {
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/* ignore trailing dots in the host name */
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if(name[namelen - 1] == '.')
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namelen--;
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}
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}
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while(*p) {
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const char *token;
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size_t tokenlen = 0;
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bool match = FALSE;
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/* pass blanks */
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while(*p && ISBLANK(*p))
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p++;
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token = p;
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/* pass over the pattern */
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while(*p && !ISBLANK(*p) && (*p != ',')) {
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p++;
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tokenlen++;
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}
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if(tokenlen) {
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switch(type) {
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case TYPE_HOST:
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/* ignore trailing dots in the token to check */
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if(token[tokenlen - 1] == '.')
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tokenlen--;
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if(tokenlen && (*token == '.')) {
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/* ignore leading token dot as well */
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token++;
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tokenlen--;
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}
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/* A: example.com matches 'example.com'
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B: www.example.com matches 'example.com'
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C: nonexample.com DOES NOT match 'example.com'
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*/
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if(tokenlen == namelen)
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/* case A, exact match */
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match = strncasecompare(token, name, namelen);
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else if(tokenlen < namelen) {
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/* case B, tailmatch domain */
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match = (name[namelen - tokenlen - 1] == '.') &&
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strncasecompare(token, name + (namelen - tokenlen),
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tokenlen);
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}
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/* case C passes through, not a match */
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break;
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case TYPE_IPV4:
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case TYPE_IPV6: {
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const char *check = token;
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char *slash;
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unsigned int bits = 0;
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char checkip[128];
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if(tokenlen >= sizeof(checkip))
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/* this cannot match */
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break;
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/* copy the check name to a temp buffer */
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memcpy(checkip, check, tokenlen);
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checkip[tokenlen] = 0;
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check = checkip;
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slash = strchr(check, '/');
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/* if the slash is part of this token, use it */
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if(slash) {
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bits = atoi(slash + 1);
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*slash = 0; /* null terminate there */
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}
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if(type == TYPE_IPV6)
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match = Curl_cidr6_match(name, check, bits);
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else
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match = Curl_cidr4_match(name, check, bits);
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break;
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}
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}
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if(match)
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return TRUE;
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} /* if(tokenlen) */
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/* pass blanks after pattern */
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while(ISBLANK(*p))
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p++;
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/* if not a comma! */
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if(*p && (*p != ',')) {
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*spacesep = TRUE;
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continue;
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}
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/* pass any number of commas */
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while(*p == ',')
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p++;
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} /* while(*p) */
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} /* NO_PROXY was specified and it wasn't just an asterisk */
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return FALSE;
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}
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#endif /* CURL_DISABLE_PROXY */
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