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getifaddrs: use if_nameindex to enumerate interfaces

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This commit is contained in:
rofl0r
2013-04-05 22:47:30 +02:00
parent 69a1983872
commit 4af3ea789a
1 changed files with 9 additions and 23 deletions
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32
src/network/getifaddrs.c
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@ -106,31 +106,18 @@ static void dealwithipv6(stor **list, stor** head)
int getifaddrs(struct ifaddrs **ifap) int getifaddrs(struct ifaddrs **ifap)
{ {
FILE* f = fopen("/proc/net/dev", "r");
if(!f) return -1;
/* the alternative to parsing /proc.. seems to be iterating
through the interfaces using an index number in ifreq.ifr_ifindex
until we get some error code back. the kernel will fill ifr_name field
for valid ifindices (SIOCGIFINDEX) */
stor *list = 0, *head = 0; stor *list = 0, *head = 0;
struct if_nameindex* ii = if_nameindex();
char* line; char linebuf[512]; if(!ii) return -1;
while((line = fgets(linebuf, sizeof linebuf, f))) { size_t i;
while(isspace(*line) && *line) line++; for(i = 0; ii[i].if_index || ii[i].if_name; i++) {
char* start = line; stor* curr = list_add(&list, &head, ii[i].if_name);
while(*line && isalnum(*line)) line++; if(!curr) {
if(line > start && *line == ':') { if_freenameindex(ii);
// found interface goto err2;
*line = 0;
stor* curr = list_add(&list, &head, start);
if(!curr) {
fclose(f);
goto err2;
}
} }
} }
fclose(f); if_freenameindex(ii);
int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP); int sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if(sock == -1) goto err2; if(sock == -1) goto err2;
@ -139,7 +126,6 @@ int getifaddrs(struct ifaddrs **ifap)
if(-1 == ioctl(sock, SIOCGIFCONF, &conf)) goto err; if(-1 == ioctl(sock, SIOCGIFCONF, &conf)) goto err;
size_t reqitems = conf.ifc_len / sizeof(struct ifreq); size_t reqitems = conf.ifc_len / sizeof(struct ifreq);
for(head = list; head; head = (stor*)head->next) { for(head = list; head; head = (stor*)head->next) {
size_t i;
for(i = 0; i < reqitems; i++) { for(i = 0; i < reqitems; i++) {
// get SIOCGIFADDR of active interfaces. // get SIOCGIFADDR of active interfaces.
if(!strcmp(reqs[i].ifr_name, head->name)) { if(!strcmp(reqs[i].ifr_name, head->name)) {