Get interface names using ioctl rather than /proc, from Nick Fedchik
This commit is contained in:
Glenn L McGrath
parent
cf1fee06a5
commit
688cf014af
@ -22,21 +22,20 @@
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*
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*/
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#include <sys/syslog.h>
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#include <sys/socket.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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#include <getopt.h>
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#include <stdlib.h>
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#include <string.h>
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#include <net/if.h>
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#include <netinet/ether.h>
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#include <linux/sockios.h>
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#include "busybox.h"
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/* set interface name, from <linux/sockios.h> */
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#define SIOCSIFNAME 0x8923
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/* Octets in one ethernet addr, from <linux/if_ether.h> */
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#define ETH_ALEN 6
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@ -46,12 +45,12 @@
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typedef struct mactable_s {
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struct mactable_s *next;
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struct mactable_s **pprev;
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struct mactable_s *prev;
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char *ifname;
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struct ether_addr *mac;
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} mactable_t;
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static void serror_msg_and_die(const char use_syslog, const char *s, ...)
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static void serror(const char use_syslog, const char *s, ...)
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{
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va_list ap;
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@ -67,20 +66,35 @@ static void serror_msg_and_die(const char use_syslog, const char *s, ...)
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}
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va_end(ap);
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exit(EXIT_FAILURE);
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}
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/* Check ascii str_macaddr, convert and copy to *mac */
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struct ether_addr *cc_macaddr(char *str_macaddr, unsigned char use_syslog)
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{
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struct ether_addr *lmac, *mac;
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lmac = ether_aton(str_macaddr);
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if (lmac == NULL)
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serror(use_syslog, "cannot parse MAC %s", str_macaddr);
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mac = xcalloc(1, ETH_ALEN);
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memcpy(mac, lmac, ETH_ALEN);
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return mac;
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}
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int nameif_main(int argc, char **argv)
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{
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mactable_t *clist = NULL;
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FILE *ifh;
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char *fname = "/etc/mactab";
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char *line;
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unsigned short linenum = 0;
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unsigned char use_syslog = 0;
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int ctl_sk = -1;
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int opt;
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int if_index = 1;
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mactable_t *ch = NULL;
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static struct option opts[] = {
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{"syslog", 0, NULL, 's'},
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@ -101,40 +115,33 @@ int nameif_main(int argc, char **argv)
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}
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}
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if ((argc - optind) & 1) {
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if ((argc - optind) & 1)
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show_usage();
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}
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if (optind < argc) {
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while (optind < argc) {
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struct ether_addr *mac;
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mactable_t *ch;
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if (strlen(argv[optind]) > IF_NAMESIZE) {
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serror_msg_and_die(use_syslog, "interface name `%s' too long", argv[optind]);
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}
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if (strlen(argv[optind]) > IF_NAMESIZE)
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serror(use_syslog, "interface name `%s' too long",
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argv[optind]);
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optind++;
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mac = ether_aton(argv[optind]);
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if (mac == NULL) {
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serror_msg_and_die(use_syslog, "cannot parse MAC %s", argv[optind]);
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}
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ch = xcalloc(1, sizeof(mactable_t));
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ch->next = NULL;
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ch->prev = NULL;
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ch->ifname = strdup(argv[optind - 1]);
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ch->mac = xcalloc(1, ETH_ALEN);
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memcpy(ch->mac, mac, ETH_ALEN);
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ch->mac = cc_macaddr(argv[optind], use_syslog);
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optind++;
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if (clist)
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clist->pprev = &ch->next;
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clist->prev = ch->next;
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ch->next = clist;
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ch->pprev = &clist;
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ch->prev = clist;
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clist = ch;
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}
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} else {
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ifh = xfopen(fname, "r");
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while ((line = get_line_from_file(ifh)) != NULL) {
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struct ether_addr *mac;
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mactable_t *ch;
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char *line_ptr;
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unsigned short name_length;
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@ -142,74 +149,71 @@ int nameif_main(int argc, char **argv)
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if ((line_ptr[0] == '#') || (line_ptr[0] == '\n'))
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continue;
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name_length = strcspn(line_ptr, " \t");
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if (name_length > IF_NAMESIZE) {
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serror_msg_and_die(use_syslog, "interface name `%s' too long", argv[optind]);
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}
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if (name_length > IF_NAMESIZE)
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serror(use_syslog, "interface name `%s' too long",
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argv[optind]);
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ch = xcalloc(1, sizeof(mactable_t));
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ch->next = NULL;
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ch->prev = NULL;
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ch->ifname = strndup(line_ptr, name_length);
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line_ptr += name_length;
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line_ptr += strspn(line_ptr, " \t");
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name_length = strspn(line_ptr, "0123456789ABCDEFabcdef:");
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line_ptr[name_length] = '\0';
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mac = ether_aton(line_ptr);
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if (mac == NULL) {
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serror_msg_and_die(use_syslog, "cannot parse MAC %s", argv[optind]);
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}
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ch->mac = xcalloc(1, ETH_ALEN);
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memcpy(ch->mac, mac, ETH_ALEN);
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ch->mac = cc_macaddr(line_ptr, use_syslog);
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if (clist)
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clist->pprev = &ch->next;
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clist->prev = ch;
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ch->next = clist;
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ch->pprev = &clist;
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clist = ch;
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free(line);
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}
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fclose(ifh);
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}
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ifh = xfopen("/proc/net/dev", "r");
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while ((line = get_line_from_file(ifh)) != NULL) {
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char *line_ptr;
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unsigned short iface_name_length;
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struct ifreq ifr;
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mactable_t *ch = NULL;
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if ((ctl_sk = socket(PF_INET, SOCK_DGRAM, 0)) == -1)
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serror(use_syslog, "socket: %s", strerror(errno));
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linenum++;
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if (linenum < 3)
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while (clist) {
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struct ifreq ifr;
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bzero(&ifr, sizeof(struct ifreq));
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if_index++;
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ifr.ifr_ifindex = if_index;
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/* Get ifname by index or die */
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if (ioctl(ctl_sk, SIOCGIFNAME, &ifr))
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break;
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/* Has this device hwaddr? */
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if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr))
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continue;
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line_ptr = line + strspn(line, " \t");
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if (line_ptr[0] == '\n')
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continue;
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iface_name_length = strcspn(line_ptr, ":");
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if (ctl_sk < 0)
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ctl_sk = socket(PF_INET, SOCK_DGRAM, 0);
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, line_ptr, iface_name_length);
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if (ioctl(ctl_sk, SIOCGIFHWADDR, &ifr) < 0) {
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// serror_msg(use_syslog, "cannot read hardware address of %s: %s", ifr.ifr_name, strerror(errno));
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continue;
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}
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/* Search for mac like in ifr.ifr_hwaddr.sa_data */
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for (ch = clist; ch; ch = ch->next)
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if (!memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN))
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break;
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if (ch == NULL) {
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/* Nothing found for current ifr.ifr_hwaddr.sa_data */
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if (ch == NULL)
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continue;
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}
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strcpy(ifr.ifr_newname, ch->ifname);
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if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0)
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serror(use_syslog, "cannot change ifname %s to %s: %s",
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ifr.ifr_name, ch->ifname, strerror(errno));
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if (ioctl(ctl_sk, SIOCSIFNAME, &ifr) < 0) {;
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serror_msg_and_die(use_syslog, "cannot change name of %s to %s: %s", ifr.ifr_name, ch->ifname, strerror(errno));
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/* Remove list entry of renamed interface */
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if (ch->prev != NULL) {
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(ch->prev)->next = ch->next;
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} else {
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clist = ch->next;
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}
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*ch->pprev = ch->next;
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if (ch->next != NULL)
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(ch->next)->prev = ch->prev;
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free(ch);
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free(line);
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}
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fclose(ifh);
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while (clist) {
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mactable_t *ch;
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ch = clist;
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clist = clist->next;
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free(ch);
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