diff options
Diffstat (limited to 'lib/if2ip.c')
-rw-r--r-- | lib/if2ip.c | 207 |
1 files changed, 159 insertions, 48 deletions
diff --git a/lib/if2ip.c b/lib/if2ip.c index 19504d1f..6e6f9692 100644 --- a/lib/if2ip.c +++ b/lib/if2ip.c @@ -5,7 +5,7 @@ * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * - * Copyright (C) 1998 - 2009, Daniel Stenberg, <daniel@haxx.se>, et al. + * Copyright (C) 1998 - 2015, 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 @@ -20,14 +20,8 @@ * ***************************************************************************/ -#include "setup.h" +#include "curl_setup.h" -#ifdef HAVE_UNISTD_H -# include <unistd.h> -#endif -#ifdef HAVE_SYS_SOCKET_H -# include <sys/socket.h> -#endif #ifdef HAVE_NETINET_IN_H # include <netinet/in.h> #endif @@ -59,9 +53,7 @@ #include "inet_ntop.h" #include "strequal.h" #include "if2ip.h" - -#define _MPRINTF_REPLACE /* use our functions only */ -#include <curl/mprintf.h> +#include "curl_printf.h" #include "curl_memory.h" /* The last #include file should be: */ @@ -69,92 +61,211 @@ /* ------------------------------------------------------------------ */ +/* 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 *) sa; + const unsigned char * b = sa6->sin6_addr.s6_addr; + unsigned short w = (unsigned short) ((b[0] << 8) | b[1]); + + 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) -char *Curl_if2ip(int af, const char *interface, char *buf, int buf_size) +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(curl_strequal(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; - char *ip=NULL; - - if (getifaddrs(&head) >= 0) { - for (iface=head; iface != NULL; iface=iface->ifa_next) { - if ((iface->ifa_addr != NULL) && - (iface->ifa_addr->sa_family == af) && - curl_strequal(iface->ifa_name, interface)) { - void *addr; - char scope[12]=""; + if2ip_result_t res = IF2IP_NOT_FOUND; + +#ifndef ENABLE_IPV6 + (void) remote_scope; + +#ifndef HAVE_SOCKADDR_IN6_SIN6_SCOPE_ID + (void) remote_scope_id; +#endif + +#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(curl_strequal(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; - addr = &((struct sockaddr_in6 *)iface->ifa_addr)->sin6_addr; + 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 *)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 *)iface->ifa_addr)->sin6_scope_id; + /* Include the scope of this interface as part of the address */ + scopeid = + ((struct sockaddr_in6 *)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 + if(scopeid) + snprintf(scope, sizeof(scope), "%%%u", scopeid); + } + else #endif - addr = &((struct sockaddr_in *)iface->ifa_addr)->sin_addr; - ip = (char *) Curl_inet_ntop(af, addr, buf, buf_size); - strlcat(buf, scope, buf_size); - break; + addr = &((struct sockaddr_in *)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) && + curl_strequal(iface->ifa_name, interf)) { + res = IF2IP_AF_NOT_SUPPORTED; + } } } + freeifaddrs(head); } - return ip; + + return res; } #elif defined(HAVE_IOCTL_SIOCGIFADDR) -char *Curl_if2ip(int af, const char *interface, char *buf, int buf_size) +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; - char *ip; - if(!interface || (af != AF_INET)) - return NULL; + (void)remote_scope; + (void)remote_scope_id; + + if(!interf || (af != AF_INET)) + return IF2IP_NOT_FOUND; - len = strlen(interface); + len = strlen(interf); if(len >= sizeof(req.ifr_name)) - return NULL; + return IF2IP_NOT_FOUND; dummy = socket(AF_INET, SOCK_STREAM, 0); if(CURL_SOCKET_BAD == dummy) - return NULL; + return IF2IP_NOT_FOUND; memset(&req, 0, sizeof(req)); - memcpy(req.ifr_name, interface, len+1); + memcpy(req.ifr_name, interf, len+1); req.ifr_addr.sa_family = AF_INET; if(ioctl(dummy, SIOCGIFADDR, &req) < 0) { sclose(dummy); - return NULL; + /* 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 *)&req.ifr_addr; memcpy(&in, &s->sin_addr, sizeof(in)); - ip = (char *) Curl_inet_ntop(s->sin_family, &in, buf, buf_size); + Curl_inet_ntop(s->sin_family, &in, buf, buf_size); sclose(dummy); - return ip; + return IF2IP_FOUND; } #else -char *Curl_if2ip(int af, const char *interf, char *buf, int buf_size) +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 NULL; + return IF2IP_NOT_FOUND; } #endif |