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https://github.com/sheumann/hush.git
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233 lines
6.0 KiB
C
233 lines
6.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* nameif.c - Naming Interfaces based on MAC address for busybox.
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*
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* Written 2000 by Andi Kleen.
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* Busybox port 2002 by Nick Fedchik <nick@fedchik.org.ua>
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* Glenn McGrath
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* Extended matching support 2008 by Nico Erfurth <masta@perlgolf.de>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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#include "libbb.h"
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#include <syslog.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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#ifndef IFNAMSIZ
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#define IFNAMSIZ 16
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#endif
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/* Taken from linux/sockios.h */
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#define SIOCSIFNAME 0x8923 /* set interface name */
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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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#ifndef ifr_newname
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#define ifr_newname ifr_ifru.ifru_slave
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#endif
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typedef struct ethtable_s {
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struct ethtable_s *next;
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struct ethtable_s *prev;
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char *ifname;
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struct ether_addr *mac;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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char *bus_info;
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char *driver;
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#endif
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} ethtable_t;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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/* Cut'n'paste from ethtool.h */
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#define ETHTOOL_BUSINFO_LEN 32
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/* these strings are set to whatever the driver author decides... */
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struct ethtool_drvinfo {
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uint32_t cmd;
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char driver[32]; /* driver short name, "tulip", "eepro100" */
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char version[32]; /* driver version string */
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char fw_version[32]; /* firmware version string, if applicable */
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char bus_info[ETHTOOL_BUSINFO_LEN]; /* Bus info for this IF. */
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/* For PCI devices, use pci_dev->slot_name. */
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char reserved1[32];
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char reserved2[16];
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uint32_t n_stats; /* number of u64's from ETHTOOL_GSTATS */
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uint32_t testinfo_len;
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uint32_t eedump_len; /* Size of data from ETHTOOL_GEEPROM (bytes) */
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uint32_t regdump_len; /* Size of data from ETHTOOL_GREGS (bytes) */
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};
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#define ETHTOOL_GDRVINFO 0x00000003 /* Get driver info. */
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#endif
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static void nameif_parse_selector(ethtable_t *ch, char *selector)
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{
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struct ether_addr *lmac;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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int found_selector = 0;
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while (*selector) {
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char *next;
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#endif
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selector = skip_whitespace(selector);
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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if (*selector == '\0')
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break;
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/* Search for the end .... */
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next = skip_non_whitespace(selector);
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if (*next)
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*next++ = '\0';
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/* Check for selectors, mac= is assumed */
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if (strncmp(selector, "bus=", 4) == 0) {
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ch->bus_info = xstrdup(selector + 4);
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found_selector++;
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} else if (strncmp(selector, "driver=", 7) == 0) {
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ch->driver = xstrdup(selector + 7);
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found_selector++;
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} else {
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#endif
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lmac = xmalloc(ETH_ALEN);
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ch->mac = ether_aton_r(selector + (strncmp(selector, "mac=", 4) ? 0 : 4), lmac);
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if (ch->mac == NULL)
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bb_error_msg_and_die("cannot parse %s", selector);
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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found_selector++;
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};
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selector = next;
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}
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if (found_selector == 0)
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bb_error_msg_and_die("no selectors found for %s", ch->ifname);
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#endif
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}
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static void prepend_new_eth_table(ethtable_t **clist, char *ifname, char *selector)
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{
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ethtable_t *ch;
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if (strlen(ifname) >= IFNAMSIZ)
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bb_error_msg_and_die("interface name '%s' too long", ifname);
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ch = xzalloc(sizeof(*ch));
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ch->ifname = xstrdup(ifname);
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nameif_parse_selector(ch, selector);
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ch->next = *clist;
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if (*clist)
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(*clist)->prev = ch;
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*clist = ch;
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}
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#if ENABLE_FEATURE_CLEAN_UP
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static void delete_eth_table(ethtable_t *ch)
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{
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free(ch->ifname);
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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free(ch->bus_info);
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free(ch->driver);
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#endif
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free(ch->mac);
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free(ch);
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};
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#else
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void delete_eth_table(ethtable_t *ch);
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#endif
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int nameif_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nameif_main(int argc, char **argv)
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{
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ethtable_t *clist = NULL;
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const char *fname = "/etc/mactab";
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int ctl_sk;
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ethtable_t *ch;
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parser_t *parser;
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char *token[2];
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if (1 & getopt32(argv, "sc:", &fname)) {
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openlog(applet_name, 0, LOG_LOCAL0);
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logmode = LOGMODE_SYSLOG;
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}
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argc -= optind;
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argv += optind;
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if (argc & 1)
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bb_show_usage();
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if (argc) {
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while (*argv) {
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char *ifname = xstrdup(*argv++);
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prepend_new_eth_table(&clist, ifname, *argv++);
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}
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} else {
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parser = config_open(fname);
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while (config_read(parser, token, 2, 2, "# \t", PARSE_NORMAL))
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prepend_new_eth_table(&clist, token[0], token[1]);
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config_close(parser);
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}
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ctl_sk = xsocket(PF_INET, SOCK_DGRAM, 0);
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parser = config_open2("/proc/net/dev", xfopen_for_read);
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while (clist && config_read(parser, token, 2, 2, "\0: \t", PARSE_NORMAL)) {
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struct ifreq ifr;
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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struct ethtool_drvinfo drvinfo;
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#endif
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if (parser->lineno < 2)
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continue; /* Skip the first two lines */
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/* Find the current interface name and copy it to ifr.ifr_name */
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memset(&ifr, 0, sizeof(struct ifreq));
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strncpy(ifr.ifr_name, token[0], sizeof(ifr.ifr_name));
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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/* Check for driver etc. */
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memset(&drvinfo, 0, sizeof(struct ethtool_drvinfo));
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drvinfo.cmd = ETHTOOL_GDRVINFO;
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ifr.ifr_data = (caddr_t) &drvinfo;
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/* Get driver and businfo first, so we have it in drvinfo */
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ioctl(ctl_sk, SIOCETHTOOL, &ifr);
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#endif
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ioctl(ctl_sk, SIOCGIFHWADDR, &ifr);
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/* Search the list for a matching device */
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for (ch = clist; ch; ch = ch->next) {
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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if (ch->bus_info && strcmp(ch->bus_info, drvinfo.bus_info) != 0)
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continue;
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if (ch->driver && strcmp(ch->driver, drvinfo.driver) != 0)
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continue;
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#endif
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if (ch->mac && memcmp(ch->mac, ifr.ifr_hwaddr.sa_data, ETH_ALEN) != 0)
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continue;
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/* if we came here, all selectors have matched */
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break;
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}
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/* Nothing found for current interface */
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if (!ch)
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continue;
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if (strcmp(ifr.ifr_name, ch->ifname) != 0) {
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strcpy(ifr.ifr_newname, ch->ifname);
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ioctl_or_perror_and_die(ctl_sk, SIOCSIFNAME, &ifr,
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"cannot change ifname %s to %s",
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ifr.ifr_name, ch->ifname);
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}
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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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if (ch->next != NULL)
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ch->next->prev = ch->prev;
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if (ENABLE_FEATURE_CLEAN_UP)
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delete_eth_table(ch);
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}
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if (ENABLE_FEATURE_CLEAN_UP) {
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for (ch = clist; ch; ch = ch->next)
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delete_eth_table(ch);
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config_close(parser);
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};
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return 0;
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}
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