77216c368f
Various tools are Linuxish and should thus only attempted to build on Linux only. Some features are also Linux-only. Also, libresolv is used on all GNU platforms, notably GNU/Hurd and GNU/kfreeBSD. Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
331 lines
9.8 KiB
C
331 lines
9.8 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 GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config NAMEIF
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//config: bool "nameif (6.6 kb)"
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//config: default y
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//config: select PLATFORM_LINUX
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//config: select FEATURE_SYSLOG
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//config: help
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//config: nameif is used to rename network interface by its MAC address.
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//config: Renamed interfaces MUST be in the down state.
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//config: It is possible to use a file (default: /etc/mactab)
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//config: with list of new interface names and MACs.
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//config: Maximum interface name length: IFNAMSIZ = 16
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//config: File fields are separated by space or tab.
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//config: File format:
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//config: # Comment
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//config: new_interface_name XX:XX:XX:XX:XX:XX
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//config:
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//config:config FEATURE_NAMEIF_EXTENDED
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//config: bool "Extended nameif"
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//config: default y
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//config: depends on NAMEIF
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//config: help
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//config: This extends the nameif syntax to support the bus_info, driver,
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//config: phyaddr selectors. The syntax is compatible to the normal nameif.
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//config: File format:
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//config: new_interface_name driver=asix bus=usb-0000:00:08.2-3
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//config: new_interface_name bus=usb-0000:00:08.2-3 00:80:C8:38:91:B5
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//config: new_interface_name phy_address=2 00:80:C8:38:91:B5
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//config: new_interface_name mac=00:80:C8:38:91:B5
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//config: new_interface_name 00:80:C8:38:91:B5
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//applet:IF_NAMEIF(APPLET_NOEXEC(nameif, nameif, BB_DIR_SBIN, BB_SUID_DROP, nameif))
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//kbuild:lib-$(CONFIG_NAMEIF) += nameif.o
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//usage:#define nameif_trivial_usage
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//usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
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//usage: "[-s] [-c FILE] [IFNAME HWADDR]..."
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//usage: )
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//usage: IF_FEATURE_NAMEIF_EXTENDED(
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//usage: "[-s] [-c FILE] [IFNAME SELECTOR]..."
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//usage: )
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//usage:#define nameif_full_usage "\n\n"
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//usage: "Rename network interface while it in the down state."
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//usage: IF_NOT_FEATURE_NAMEIF_EXTENDED(
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//usage: "\nThe device with address HWADDR is renamed to IFNAME."
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//usage: )
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//usage: IF_FEATURE_NAMEIF_EXTENDED(
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//usage: "\nThe device matched by SELECTOR is renamed to IFNAME."
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//usage: "\nSELECTOR can be a combination of:"
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//usage: "\n driver=STRING"
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//usage: "\n bus=STRING"
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//usage: "\n phy_address=NUM"
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//usage: "\n [mac=]XX:XX:XX:XX:XX:XX"
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//usage: )
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//usage: "\n"
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//usage: "\n -c FILE Configuration file (default: /etc/mactab)"
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//usage: "\n -s Log to syslog"
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//usage:
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//usage:#define nameif_example_usage
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//usage: "$ nameif -s dmz0 00:A0:C9:8C:F6:3F\n"
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//usage: " or\n"
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//usage: "$ nameif -c /etc/my_mactab_file\n"
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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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int32_t phy_address;
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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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struct ethtool_cmd {
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uint32_t cmd;
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uint32_t supported; /* Features this interface supports */
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uint32_t advertising; /* Features this interface advertises */
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uint16_t speed; /* The forced speed, 10Mb, 100Mb, gigabit */
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uint8_t duplex; /* Duplex, half or full */
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uint8_t port; /* Which connector port */
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uint8_t phy_address;
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uint8_t transceiver; /* Which transceiver to use */
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uint8_t autoneg; /* Enable or disable autonegotiation */
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uint32_t maxtxpkt; /* Tx pkts before generating tx int */
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uint32_t maxrxpkt; /* Rx pkts before generating rx int */
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uint16_t speed_hi;
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uint16_t reserved2;
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uint32_t reserved[3];
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};
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#define ETHTOOL_GSET 0x00000001 /* Get settings. */
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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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ch->phy_address = -1;
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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 (is_prefixed_with(selector, "bus=")) {
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ch->bus_info = xstrdup(selector + 4);
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found_selector++;
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} else if (is_prefixed_with(selector, "driver=")) {
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ch->driver = xstrdup(selector + 7);
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found_selector++;
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} else if (is_prefixed_with(selector, "phyaddr=")) {
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ch->phy_address = xatoi_positive(selector + 8);
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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 + (is_prefixed_with(selector, "mac=") ? 4 : 0), lmac);
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if (ch->mac == NULL)
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bb_error_msg_and_die("can't 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 UNUSED_PARAM, 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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/* Why not just "="? I assume logging to stderr
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* can't hurt. 2>/dev/null if you don't like it: */
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logmode |= LOGMODE_SYSLOG;
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}
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argv += optind;
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if (argv[0]) {
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do {
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if (!argv[1])
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bb_show_usage();
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prepend_new_eth_table(&clist, argv[0], argv[1]);
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argv += 2;
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} while (*argv);
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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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struct ethtool_cmd eth_settings;
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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_IFNAMSIZ(ifr.ifr_name, token[0]);
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#if ENABLE_FEATURE_NAMEIF_EXTENDED
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/* Check for phy address */
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memset(ð_settings, 0, sizeof(eth_settings));
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eth_settings.cmd = ETHTOOL_GSET;
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ifr.ifr_data = (caddr_t) ð_settings;
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ioctl(ctl_sk, SIOCETHTOOL, &ifr);
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/* Check for driver etc. */
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memset(&drvinfo, 0, sizeof(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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if (ch->phy_address != -1 && ch->phy_address != eth_settings.phy_address)
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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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goto found;
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}
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/* Nothing found for current interface */
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continue;
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found:
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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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"can't 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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} /* while */
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if (ENABLE_FEATURE_CLEAN_UP) {
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ethtable_t *next;
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for (ch = clist; ch; ch = next) {
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next = ch->next;
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delete_eth_table(ch);
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}
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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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