| 1 | /***************************************************************************
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| 2 | * _ _ ____ _
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| 3 | * Project ___| | | | _ \| |
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| 4 | * / __| | | | |_) | |
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| 5 | * | (__| |_| | _ <| |___
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| 6 | * \___|\___/|_| \_\_____|
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| 7 | *
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| 8 | * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
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| 9 | *
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| 10 | * This software is licensed as described in the file COPYING, which
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| 11 | * you should have received as part of this distribution. The terms
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| 12 | * are also available at https://curl.se/docs/copyright.html.
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| 13 | *
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| 14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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| 15 | * copies of the Software, and permit persons to whom the Software is
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| 16 | * furnished to do so, under the terms of the COPYING file.
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| 17 | *
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| 18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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| 19 | * KIND, either express or implied.
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| 20 | *
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| 21 | ***************************************************************************/
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| 22 |
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| 23 | #include "curl_setup.h"
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| 24 |
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| 25 | #ifdef HAVE_NETINET_IN_H
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| 26 | # include <netinet/in.h>
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| 27 | #endif
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| 28 | #ifdef HAVE_ARPA_INET_H
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| 29 | # include <arpa/inet.h>
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| 30 | #endif
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| 31 | #ifdef HAVE_NET_IF_H
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| 32 | # include <net/if.h>
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| 33 | #endif
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| 34 | #ifdef HAVE_SYS_IOCTL_H
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| 35 | # include <sys/ioctl.h>
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| 36 | #endif
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| 37 | #ifdef HAVE_NETDB_H
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| 38 | # include <netdb.h>
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| 39 | #endif
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| 40 | #ifdef HAVE_SYS_SOCKIO_H
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| 41 | # include <sys/sockio.h>
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| 42 | #endif
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| 43 | #ifdef HAVE_IFADDRS_H
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| 44 | # include <ifaddrs.h>
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| 45 | #endif
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| 46 | #ifdef HAVE_STROPTS_H
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| 47 | # include <stropts.h>
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| 48 | #endif
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| 49 | #ifdef __VMS
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| 50 | # include <inet.h>
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| 51 | #endif
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| 52 |
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| 53 | #include "inet_ntop.h"
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| 54 | #include "strcase.h"
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| 55 | #include "if2ip.h"
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| 56 | /* The last 3 #include files should be in this order */
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| 57 | #include "curl_printf.h"
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| 58 | #include "curl_memory.h"
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| 59 | #include "memdebug.h"
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| 60 |
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| 61 | /* ------------------------------------------------------------------ */
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| 62 |
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| 63 | #ifdef ENABLE_IPV6
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| 64 | /* Return the scope of the given address. */
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| 65 | unsigned int Curl_ipv6_scope(const struct sockaddr *sa)
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| 66 | {
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| 67 | if(sa->sa_family == AF_INET6) {
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| 68 | const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa;
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| 69 | const unsigned char *b = sa6->sin6_addr.s6_addr;
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| 70 | unsigned short w = (unsigned short) ((b[0] << 8) | b[1]);
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| 71 |
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| 72 | if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */
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| 73 | return IPV6_SCOPE_UNIQUELOCAL;
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| 74 | switch(w & 0xFFC0) {
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| 75 | case 0xFE80:
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| 76 | return IPV6_SCOPE_LINKLOCAL;
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| 77 | case 0xFEC0:
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| 78 | return IPV6_SCOPE_SITELOCAL;
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| 79 | case 0x0000:
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| 80 | w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] |
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| 81 | b[10] | b[11] | b[12] | b[13] | b[14];
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| 82 | if(w || b[15] != 0x01)
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| 83 | break;
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| 84 | return IPV6_SCOPE_NODELOCAL;
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| 85 | default:
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| 86 | break;
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| 87 | }
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| 88 | }
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| 89 | return IPV6_SCOPE_GLOBAL;
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| 90 | }
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| 91 | #endif
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| 92 |
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| 93 | #if defined(HAVE_GETIFADDRS)
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| 94 |
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| 95 | if2ip_result_t Curl_if2ip(int af,
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| 96 | #ifdef ENABLE_IPV6
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| 97 | unsigned int remote_scope,
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| 98 | unsigned int local_scope_id,
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| 99 | #endif
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| 100 | const char *interf,
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| 101 | char *buf, int buf_size)
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| 102 | {
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| 103 | struct ifaddrs *iface, *head;
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| 104 | if2ip_result_t res = IF2IP_NOT_FOUND;
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| 105 |
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| 106 | #if defined(ENABLE_IPV6) && \
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| 107 | !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID)
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| 108 | (void) local_scope_id;
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| 109 | #endif
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| 110 |
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| 111 | if(getifaddrs(&head) >= 0) {
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| 112 | for(iface = head; iface != NULL; iface = iface->ifa_next) {
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| 113 | if(iface->ifa_addr) {
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| 114 | if(iface->ifa_addr->sa_family == af) {
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| 115 | if(strcasecompare(iface->ifa_name, interf)) {
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| 116 | void *addr;
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| 117 | const char *ip;
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| 118 | char scope[12] = "";
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| 119 | char ipstr[64];
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| 120 | #ifdef ENABLE_IPV6
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| 121 | if(af == AF_INET6) {
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| 122 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
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| 123 | unsigned int scopeid = 0;
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| 124 | #endif
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| 125 | unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr);
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| 126 |
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| 127 | if(ifscope != remote_scope) {
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| 128 | /* We are interested only in interface addresses whose scope
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| 129 | matches the remote address we want to connect to: global
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| 130 | for global, link-local for link-local, etc... */
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| 131 | if(res == IF2IP_NOT_FOUND)
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| 132 | res = IF2IP_AF_NOT_SUPPORTED;
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| 133 | continue;
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| 134 | }
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| 135 |
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| 136 | addr =
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| 137 | &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr;
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| 138 | #ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID
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| 139 | /* Include the scope of this interface as part of the address */
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| 140 | scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr)
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| 141 | ->sin6_scope_id;
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| 142 |
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| 143 | /* If given, scope id should match. */
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| 144 | if(local_scope_id && scopeid != local_scope_id) {
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| 145 | if(res == IF2IP_NOT_FOUND)
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| 146 | res = IF2IP_AF_NOT_SUPPORTED;
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| 147 |
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| 148 | continue;
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| 149 | }
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| 150 |
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| 151 | if(scopeid)
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| 152 | msnprintf(scope, sizeof(scope), "%%%u", scopeid);
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| 153 | #endif
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| 154 | }
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| 155 | else
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| 156 | #endif
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| 157 | addr =
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| 158 | &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr;
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| 159 | res = IF2IP_FOUND;
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| 160 | ip = Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr));
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| 161 | msnprintf(buf, buf_size, "%s%s", ip, scope);
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| 162 | break;
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| 163 | }
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| 164 | }
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| 165 | else if((res == IF2IP_NOT_FOUND) &&
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| 166 | strcasecompare(iface->ifa_name, interf)) {
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| 167 | res = IF2IP_AF_NOT_SUPPORTED;
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| 168 | }
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| 169 | }
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| 170 | }
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| 171 |
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| 172 | freeifaddrs(head);
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| 173 | }
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| 174 |
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| 175 | return res;
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| 176 | }
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| 177 |
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| 178 | #elif defined(HAVE_IOCTL_SIOCGIFADDR)
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| 179 |
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| 180 | if2ip_result_t Curl_if2ip(int af,
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| 181 | #ifdef ENABLE_IPV6
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| 182 | unsigned int remote_scope,
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| 183 | unsigned int local_scope_id,
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| 184 | #endif
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| 185 | const char *interf,
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| 186 | char *buf, int buf_size)
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| 187 | {
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| 188 | struct ifreq req;
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| 189 | struct in_addr in;
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| 190 | struct sockaddr_in *s;
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| 191 | curl_socket_t dummy;
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| 192 | size_t len;
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| 193 | const char *r;
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| 194 |
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| 195 | #ifdef ENABLE_IPV6
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| 196 | (void)remote_scope;
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| 197 | (void)local_scope_id;
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| 198 | #endif
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| 199 |
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| 200 | if(!interf || (af != AF_INET))
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| 201 | return IF2IP_NOT_FOUND;
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| 202 |
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| 203 | len = strlen(interf);
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| 204 | if(len >= sizeof(req.ifr_name))
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| 205 | return IF2IP_NOT_FOUND;
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| 206 |
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| 207 | dummy = socket(AF_INET, SOCK_STREAM, 0);
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| 208 | if(CURL_SOCKET_BAD == dummy)
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| 209 | return IF2IP_NOT_FOUND;
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| 210 |
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| 211 | memset(&req, 0, sizeof(req));
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| 212 | memcpy(req.ifr_name, interf, len + 1);
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| 213 | req.ifr_addr.sa_family = AF_INET;
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| 214 |
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| 215 | if(ioctl(dummy, SIOCGIFADDR, &req) < 0) {
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| 216 | sclose(dummy);
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| 217 | /* With SIOCGIFADDR, we cannot tell the difference between an interface
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| 218 | that does not exist and an interface that has no address of the
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| 219 | correct family. Assume the interface does not exist */
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| 220 | return IF2IP_NOT_FOUND;
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| 221 | }
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| 222 |
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| 223 | s = (struct sockaddr_in *)(void *)&req.ifr_addr;
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| 224 | memcpy(&in, &s->sin_addr, sizeof(in));
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| 225 | r = Curl_inet_ntop(s->sin_family, &in, buf, buf_size);
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| 226 |
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| 227 | sclose(dummy);
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| 228 | if(!r)
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| 229 | return IF2IP_NOT_FOUND;
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| 230 | return IF2IP_FOUND;
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| 231 | }
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| 232 |
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| 233 | #else
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| 234 |
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| 235 | if2ip_result_t Curl_if2ip(int af,
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| 236 | #ifdef ENABLE_IPV6
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| 237 | unsigned int remote_scope,
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| 238 | unsigned int local_scope_id,
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| 239 | #endif
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| 240 | const char *interf,
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| 241 | char *buf, int buf_size)
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| 242 | {
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| 243 | (void) af;
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| 244 | #ifdef ENABLE_IPV6
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| 245 | (void) remote_scope;
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| 246 | (void) local_scope_id;
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| 247 | #endif
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| 248 | (void) interf;
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| 249 | (void) buf;
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| 250 | (void) buf_size;
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| 251 | return IF2IP_NOT_FOUND;
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| 252 | }
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| 253 |
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| 254 | #endif
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