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Switched to if_nameindex for interface selection.

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This commit is contained in:
pdw
2002-11-01 12:11:25 +00:00
parent 0bd117e39d
commit 09e55647de
1 changed files with 13 additions and 21 deletions
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30
options.c
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@@ -45,32 +45,24 @@ static int is_bad_interface_name(char *i) {
/* This finds the first interface which is up and is not the loopback /* This finds the first interface which is up and is not the loopback
* interface or one of the interface types listed in bad_interface_names. */ * interface or one of the interface types listed in bad_interface_names. */
static char *get_first_interface(void) { static char *get_first_interface(void) {
int s, size = 1; struct if_nameindex * nameindex;
struct ifreq *ifr;
struct ifconf ifc = {0};
char *i = NULL; char *i = NULL;
int j = 0;
/* Use if_nameindex(3) instead? */ /* Use if_nameindex(3) instead? */
if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
return NULL; nameindex = if_nameindex();
ifc.ifc_len = sizeof *ifr; if(nameindex == NULL) {
do {
++size;
ifc.ifc_req = xrealloc(ifc.ifc_req, size * sizeof *ifc.ifc_req);
ifc.ifc_len = size * sizeof *ifc.ifc_req;
if (ioctl(s, SIOCGIFCONF, &ifc) == -1) {
perror("SIOCGIFCONF");
return NULL; return NULL;
} }
} while (size * sizeof *ifc.ifc_req <= ifc.ifc_len);
/* Ugly. */ while(nameindex[j].if_index != 0) {
for (ifr = ifc.ifc_req; (char*)ifr < (char*)ifc.ifc_req + ifc.ifc_len; ++ifr) { if (strcmp(nameindex[j].if_name, "lo") != 0 && !is_bad_interface_name(nameindex[j].if_name)) {
if (strcmp(ifr->ifr_name, "lo") != 0 && !is_bad_interface_name(ifr->ifr_name) i = xstrdup(nameindex[j].if_name);
&& ioctl(s, SIOCGIFFLAGS, ifr) == 0 && ifr->ifr_flags & IFF_UP) {
i = xstrdup(ifr->ifr_name);
break; break;
} }
j++;
} }
xfree(ifc.ifc_req); if_freenameindex(nameindex);
return i; return i;
} }