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Obtain IP address in a portable way, patch by Baptiste Daroussin

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This commit is contained in:
Michael Stapelberg 2009-07-22 18:27:55 +02:00
parent bb50e22fd3
commit 4a6deddf7b
1 changed files with 28 additions and 12 deletions
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40
src/get_ip_addr.c
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@ -1,12 +1,12 @@
// vim:ts=8:expandtab
#include <net/if.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <ifaddrs.h>
#include "i3status.h"
@ -17,24 +17,40 @@
*/
const char *get_ip_addr(const char *interface) {
static char part[512];
struct ifreq ifr;
socklen_t len = sizeof(struct sockaddr_in);
memset(part, 0, sizeof(part));
/* First check if the interface is running */
(void)strcpy(ifr.ifr_name, interface);
if (ioctl(general_socket, SIOCGIFFLAGS, &ifr) < 0 ||
!(ifr.ifr_flags & IFF_RUNNING))
return NULL;
struct ifaddrs *ifaddr, *addrp;
/* Interface is up, get the IP address */
(void)strcpy(ifr.ifr_name, interface);
ifr.ifr_addr.sa_family = AF_INET;
if (ioctl(general_socket, SIOCGIFADDR, &ifr) < 0)
getifaddrs(&ifaddr);
if (ifaddr == NULL) {
(void)snprintf(part, sizeof(part), "E: down");
return part;
}
addrp = ifaddr;
/* Skip until we are at the AF_INET address of eth_interface */
for (addrp = ifaddr;
(addrp != NULL &&
(strcmp(addrp->ifa_name, eth_interface) != 0 ||
addrp->ifa_addr == NULL ||
addrp->ifa_addr->sa_family != AF_INET));
addrp = addrp->ifa_next) {
/* Check if the interface is down */
if (strcmp(addrp->ifa_name, eth_interface) == 0 &&
(addrp->ifa_flags & IFF_RUNNING) == 0)
return NULL;
}
if (addrp == NULL)
return "no IP";
int ret;
if ((ret = getnameinfo(&ifr.ifr_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
if ((ret = getnameinfo(addrp->ifa_addr, len, part, sizeof(part), NULL, 0, NI_NUMERICHOST)) != 0) {
fprintf(stderr, "getnameinfo(): %s\n", gai_strerror(ret));
return "no IP";
}