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Diffstat (limited to 'Utilities/cmcurl/lib/if2ip.c')
| -rw-r--r-- | Utilities/cmcurl/lib/if2ip.c | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/if2ip.c b/Utilities/cmcurl/lib/if2ip.c new file mode 100644 index 0000000..ce38ea1 --- /dev/null +++ b/Utilities/cmcurl/lib/if2ip.c @@ -0,0 +1,274 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2017, Daniel Stenberg, <daniel@haxx.se>, et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at https://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ***************************************************************************/ + +#include "curl_setup.h" + +#ifdef HAVE_NETINET_IN_H +# include <netinet/in.h> +#endif +#ifdef HAVE_ARPA_INET_H +# include <arpa/inet.h> +#endif +#ifdef HAVE_NET_IF_H +# include <net/if.h> +#endif +#ifdef HAVE_SYS_IOCTL_H +# include <sys/ioctl.h> +#endif +#ifdef HAVE_NETDB_H +# include <netdb.h> +#endif +#ifdef HAVE_SYS_SOCKIO_H +# include <sys/sockio.h> +#endif +#ifdef HAVE_IFADDRS_H +# include <ifaddrs.h> +#endif +#ifdef HAVE_STROPTS_H +# include <stropts.h> +#endif +#ifdef __VMS +# include <inet.h> +#endif + +#include "inet_ntop.h" +#include "strcase.h" +#include "if2ip.h" +/* The last 3 #include files should be in this order */ +#include "curl_printf.h" +#include "curl_memory.h" +#include "memdebug.h" + +/* ------------------------------------------------------------------ */ + +/* Return the scope of the given address. */ +unsigned int Curl_ipv6_scope(const struct sockaddr *sa) +{ +#ifndef ENABLE_IPV6 + (void) sa; +#else + if(sa->sa_family == AF_INET6) { + const struct sockaddr_in6 * sa6 = (const struct sockaddr_in6 *)(void *) sa; + const unsigned char *b = sa6->sin6_addr.s6_addr; + unsigned short w = (unsigned short) ((b[0] << 8) | b[1]); + + if((b[0] & 0xFE) == 0xFC) /* Handle ULAs */ + return IPV6_SCOPE_UNIQUELOCAL; + switch(w & 0xFFC0) { + case 0xFE80: + return IPV6_SCOPE_LINKLOCAL; + case 0xFEC0: + return IPV6_SCOPE_SITELOCAL; + case 0x0000: + w = b[1] | b[2] | b[3] | b[4] | b[5] | b[6] | b[7] | b[8] | b[9] | + b[10] | b[11] | b[12] | b[13] | b[14]; + if(w || b[15] != 0x01) + break; + return IPV6_SCOPE_NODELOCAL; + default: + break; + } + } +#endif + + return IPV6_SCOPE_GLOBAL; +} + + +#if defined(HAVE_GETIFADDRS) + +bool Curl_if_is_interface_name(const char *interf) +{ + bool result = FALSE; + + struct ifaddrs *iface, *head; + + if(getifaddrs(&head) >= 0) { + for(iface = head; iface != NULL; iface = iface->ifa_next) { + if(strcasecompare(iface->ifa_name, interf)) { + result = TRUE; + break; + } + } + freeifaddrs(head); + } + return result; +} + +if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, + unsigned int remote_scope_id, const char *interf, + char *buf, int buf_size) +{ + struct ifaddrs *iface, *head; + if2ip_result_t res = IF2IP_NOT_FOUND; + +#ifndef ENABLE_IPV6 + (void) remote_scope; +#endif + +#if !defined(HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID) || \ + !defined(ENABLE_IPV6) + (void) remote_scope_id; +#endif + + if(getifaddrs(&head) >= 0) { + for(iface = head; iface != NULL; iface = iface->ifa_next) { + if(iface->ifa_addr != NULL) { + if(iface->ifa_addr->sa_family == af) { + if(strcasecompare(iface->ifa_name, interf)) { + void *addr; + char *ip; + char scope[12] = ""; + char ipstr[64]; +#ifdef ENABLE_IPV6 + if(af == AF_INET6) { + unsigned int scopeid = 0; + unsigned int ifscope = Curl_ipv6_scope(iface->ifa_addr); + + if(ifscope != remote_scope) { + /* We are interested only in interface addresses whose + scope matches the remote address we want to + connect to: global for global, link-local for + link-local, etc... */ + if(res == IF2IP_NOT_FOUND) res = IF2IP_AF_NOT_SUPPORTED; + continue; + } + + addr = + &((struct sockaddr_in6 *)(void *)iface->ifa_addr)->sin6_addr; +#ifdef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID + /* Include the scope of this interface as part of the address */ + scopeid = ((struct sockaddr_in6 *)(void *)iface->ifa_addr) + ->sin6_scope_id; + + /* If given, scope id should match. */ + if(remote_scope_id && scopeid != remote_scope_id) { + if(res == IF2IP_NOT_FOUND) + res = IF2IP_AF_NOT_SUPPORTED; + + continue; + } +#endif + if(scopeid) + snprintf(scope, sizeof(scope), "%%%u", scopeid); + } + else +#endif + addr = + &((struct sockaddr_in *)(void *)iface->ifa_addr)->sin_addr; + res = IF2IP_FOUND; + ip = (char *) Curl_inet_ntop(af, addr, ipstr, sizeof(ipstr)); + snprintf(buf, buf_size, "%s%s", ip, scope); + break; + } + } + else if((res == IF2IP_NOT_FOUND) && + strcasecompare(iface->ifa_name, interf)) { + res = IF2IP_AF_NOT_SUPPORTED; + } + } + } + + freeifaddrs(head); + } + + return res; +} + +#elif defined(HAVE_IOCTL_SIOCGIFADDR) + +bool Curl_if_is_interface_name(const char *interf) +{ + /* This is here just to support the old interfaces */ + char buf[256]; + + return (Curl_if2ip(AF_INET, 0 /* unused */, 0, interf, buf, sizeof(buf)) == + IF2IP_NOT_FOUND) ? FALSE : TRUE; +} + +if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, + unsigned int remote_scope_id, const char *interf, + char *buf, int buf_size) +{ + struct ifreq req; + struct in_addr in; + struct sockaddr_in *s; + curl_socket_t dummy; + size_t len; + + (void)remote_scope; + (void)remote_scope_id; + + if(!interf || (af != AF_INET)) + return IF2IP_NOT_FOUND; + + len = strlen(interf); + if(len >= sizeof(req.ifr_name)) + return IF2IP_NOT_FOUND; + + dummy = socket(AF_INET, SOCK_STREAM, 0); + if(CURL_SOCKET_BAD == dummy) + return IF2IP_NOT_FOUND; + + memset(&req, 0, sizeof(req)); + memcpy(req.ifr_name, interf, len + 1); + req.ifr_addr.sa_family = AF_INET; + + if(ioctl(dummy, SIOCGIFADDR, &req) < 0) { + sclose(dummy); + /* With SIOCGIFADDR, we cannot tell the difference between an interface + that does not exist and an interface that has no address of the + correct family. Assume the interface does not exist */ + return IF2IP_NOT_FOUND; + } + + s = (struct sockaddr_in *)(void *)&req.ifr_addr; + memcpy(&in, &s->sin_addr, sizeof(in)); + Curl_inet_ntop(s->sin_family, &in, buf, buf_size); + + sclose(dummy); + return IF2IP_FOUND; +} + +#else + +bool Curl_if_is_interface_name(const char *interf) +{ + (void) interf; + + return FALSE; +} + +if2ip_result_t Curl_if2ip(int af, unsigned int remote_scope, + unsigned int remote_scope_id, const char *interf, + char *buf, int buf_size) +{ + (void) af; + (void) remote_scope; + (void) remote_scope_id; + (void) interf; + (void) buf; + (void) buf_size; + return IF2IP_NOT_FOUND; +} + +#endif |