ifenslave.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:18k
- /* Mode: C;
- * ifenslave.c: Configure network interfaces for parallel routing.
- *
- * This program controls the Linux implementation of running multiple
- * network interfaces in parallel.
- *
- * Usage: ifenslave [-v] master-interface < slave-interface [metric <N>] > ...
- *
- * Author: Donald Becker <becker@cesdis.gsfc.nasa.gov>
- * Copyright 1994-1996 Donald Becker
- *
- * This program is free software; you can redistribute it
- * and/or modify it under the terms of the GNU General Public
- * License as published by the Free Software Foundation.
- *
- * The author may be reached as becker@CESDIS.gsfc.nasa.gov, or C/O
- * Center of Excellence in Space Data and Information Sciences
- * Code 930.5, Goddard Space Flight Center, Greenbelt MD 20771
- *
- * Changes :
- * - 2000/10/02 Willy Tarreau <willy at meta-x.org> :
- * - few fixes. Master's MAC address is now correctly taken from
- * the first device when not previously set ;
- * - detach support : call BOND_RELEASE to detach an enslaved interface.
- * - give a mini-howto from command-line help : # ifenslave -h
- *
- * - 2001/02/16 Chad N. Tindel <ctindel at ieee dot org> :
- * - Master is now brought down before setting the MAC address. In
- * the 2.4 kernel you can't change the MAC address while the device is
- * up because you get EBUSY.
- *
- * - 2001/09/13 Takao Indoh <indou dot takao at jp dot fujitsu dot com>
- * - Added the ability to change the active interface on a mode 1 bond
- * at runtime.
- *
- * - 2001/10/23 Chad N. Tindel <ctindel at ieee dot org> :
- * - No longer set the MAC address of the master. The bond device will
- * take care of this itself
- * - Try the SIOC*** versions of the bonding ioctls before using the
- * old versions
- */
- static char *version =
- "ifenslave.c:v0.07 9/9/97 Donald Becker (becker@cesdis.gsfc.nasa.gov).n"
- "detach support added on 2000/10/02 by Willy Tarreau (willy at meta-x.org).n"
- "2.4 kernel support added on 2001/02/16 by Chad N. Tindel (ctindel at ieee dot org.n";
- static const char *usage_msg =
- "Usage: ifenslave [-adfrvVh] <master-interface> < <slave-if> [metric <N>] > ...n"
- " ifenslave -c master-interface slave-ifn";
- static const char *howto_msg =
- "Usage: ifenslave [-adfrvVh] <master-interface> < <slave-if> [metric <N>] > ...n"
- " ifenslave -c master-interface slave-ifn"
- "n"
- " To create a bond device, simply follow these three steps :n"
- " - ensure that the required drivers are properly loaded :n"
- " # modprobe bonding ; modprobe <3c59x|eepro100|pcnet32|tulip|...>n"
- " - assign an IP address to the bond device :n"
- " # ifconfig bond0 <addr> netmask <mask> broadcast <bcast>n"
- " - attach all the interfaces you need to the bond device :n"
- " # ifenslave bond0 eth0 eth1 eth2n"
- " If bond0 didn't have a MAC address, it will take eth0's. Then, alln"
- " interfaces attached AFTER this assignment will get the same MAC addr.n"
- "n"
- " To detach a dead interface without setting the bond device down :n"
- " # ifenslave -d bond0 eth1n"
- "n"
- " To set the bond device down and automatically release all the slaves :n"
- " # ifconfig bond0 downn"
- "n"
- " To change active slave :n"
- " # ifenslave -c bond0 eth0n"
- "n";
- #include <unistd.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <ctype.h>
- #include <string.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <getopt.h>
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <sys/ioctl.h>
- #include <linux/if.h>
- #include <linux/if_arp.h>
- #include <linux/if_ether.h>
- #include <linux/if_bonding.h>
- #include <linux/sockios.h>
- struct option longopts[] = {
- /* { name has_arg *flag val } */
- {"all-interfaces", 0, 0, 'a'}, /* Show all interfaces. */
- {"force", 0, 0, 'f'}, /* Force the operation. */
- {"help", 0, 0, '?'}, /* Give help */
- {"howto", 0, 0, 'h'}, /* Give some more help */
- {"receive-slave", 0, 0, 'r'}, /* Make a receive-only slave. */
- {"verbose", 0, 0, 'v'}, /* Report each action taken. */
- {"version", 0, 0, 'V'}, /* Emit version information. */
- {"detach", 0, 0, 'd'}, /* Detach a slave interface. */
- {"change-active", 0, 0, 'c'}, /* Change the active slave. */
- { 0, 0, 0, 0 }
- };
- /* Command-line flags. */
- unsigned int
- opt_a = 0, /* Show-all-interfaces flag. */
- opt_f = 0, /* Force the operation. */
- opt_r = 0, /* Set up a Rx-only slave. */
- opt_d = 0, /* detach a slave interface. */
- opt_c = 0, /* change-active-slave flag. */
- verbose = 0, /* Verbose flag. */
- opt_version = 0,
- opt_howto = 0;
- int skfd = -1; /* AF_INET socket for ioctl() calls. */
- static void if_print(char *ifname);
- int
- main(int argc, char **argv)
- {
- struct ifreq ifr2, if_hwaddr, if_ipaddr, if_metric, if_mtu, if_dstaddr;
- struct ifreq if_netmask, if_brdaddr, if_flags;
- int goterr = 0;
- int c, errflag = 0;
- sa_family_t master_family;
- char **spp, *master_ifname, *slave_ifname;
- int hwaddr_notset;
- while ((c = getopt_long(argc, argv, "acdfrvV?h", longopts, 0)) != EOF)
- switch (c) {
- case 'a': opt_a++; break;
- case 'f': opt_f++; break;
- case 'r': opt_r++; break;
- case 'd': opt_d++; break;
- case 'c': opt_c++; break;
- case 'v': verbose++; break;
- case 'V': opt_version++; break;
- case 'h': opt_howto++; break;
- case '?': errflag++;
- }
- /* option check */
- if (opt_c)
- if(opt_a || opt_f || opt_r || opt_d || verbose || opt_version ||
- opt_howto || errflag ) {
- fprintf(stderr, usage_msg);
- return 2;
- }
- if (errflag) {
- fprintf(stderr, usage_msg);
- return 2;
- }
- if (opt_howto) {
- fprintf(stderr, howto_msg);
- return 0;
- }
- if (verbose || opt_version) {
- printf(version);
- if (opt_version)
- exit(0);
- }
- /* Open a basic socket. */
- if ((skfd = socket(AF_INET, SOCK_DGRAM,0)) < 0) {
- perror("socket");
- exit(-1);
- }
- if (verbose)
- fprintf(stderr, "DEBUG: argc=%d, optind=%d and argv[optind] is %s.n",
- argc, optind, argv[optind]);
- /* No remaining args means show all interfaces. */
- if (optind == argc) {
- if_print((char *)NULL);
- (void) close(skfd);
- exit(0);
- }
- /* Copy the interface name. */
- spp = argv + optind;
- master_ifname = *spp++;
- slave_ifname = *spp++;
- /* Check command line. */
- if (opt_c) {
- char **tempp = spp;
- if ((master_ifname == NULL)||(slave_ifname == NULL)||(*tempp++ != NULL)) {
- fprintf(stderr, usage_msg);
- return 2;
- }
- }
- /* A single args means show the configuration for this interface. */
- if (slave_ifname == NULL) {
- if_print(master_ifname);
- (void) close(skfd);
- exit(0);
- }
- /* Get the vitals from the master interface. */
- {
- struct ifreq *ifra[7] = { &if_ipaddr, &if_mtu, &if_dstaddr,
- &if_brdaddr, &if_netmask, &if_flags,
- &if_hwaddr };
- const char *req_name[7] = {
- "IP address", "MTU", "destination address",
- "broadcast address", "netmask", "status flags",
- "hardware address" };
- const int ioctl_req_type[7] = {
- SIOCGIFADDR, SIOCGIFMTU, SIOCGIFDSTADDR,
- SIOCGIFBRDADDR, SIOCGIFNETMASK, SIOCGIFFLAGS,
- SIOCGIFHWADDR };
- int i;
- for (i = 0; i < 7; i++) {
- strncpy(ifra[i]->ifr_name, master_ifname, IFNAMSIZ);
- if (ioctl(skfd, ioctl_req_type[i], ifra[i]) < 0) {
- fprintf(stderr,
- "Something broke getting the master's %s: %s.n",
- req_name[i], strerror(errno));
- }
- }
- hwaddr_notset = 1; /* assume master's address not set yet */
- for (i = 0; hwaddr_notset && (i < 6); i++) {
- hwaddr_notset &= ((unsigned char *)if_hwaddr.ifr_hwaddr.sa_data)[i] == 0;
- }
- /* The family '1' is ARPHRD_ETHER for ethernet. */
- if (if_hwaddr.ifr_hwaddr.sa_family != 1 && !opt_f) {
- fprintf(stderr, "The specified master interface '%s' is not"
- " ethernet-like.n This program is designed to work"
- " with ethernet-like network interfaces.n"
- " Use the '-f' option to force the operation.n",
- master_ifname);
- exit (1);
- }
- master_family = if_hwaddr.ifr_hwaddr.sa_family;
- if (verbose) {
- unsigned char *hwaddr = (unsigned char *)if_hwaddr.ifr_hwaddr.sa_data;
- printf("The current hardware address (SIOCGIFHWADDR) of %s is type %d "
- "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.n", master_ifname,
- if_hwaddr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
- hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
- }
- }
- /* do this when enslaving interfaces */
- do {
- if (opt_d) { /* detach a slave interface from the master */
- strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
- strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
- if ((ioctl(skfd, SIOCBONDRELEASE, &if_flags) < 0) &&
- (ioctl(skfd, BOND_RELEASE_OLD, &if_flags) < 0)) {
- fprintf(stderr, "SIOCBONDRELEASE: cannot detach %s from %s. errno=%s.n",
- slave_ifname, master_ifname, strerror(errno));
- }
- else { /* we'll set the interface down to avoid any conflicts due to
- same IP/MAC */
- strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
- if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
- int saved_errno = errno;
- fprintf(stderr, "SIOCGIFFLAGS on %s failed: %sn", slave_ifname,
- strerror(saved_errno));
- }
- else {
- ifr2.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
- if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
- int saved_errno = errno;
- fprintf(stderr, "Shutting down interface %s failed: %sn",
- slave_ifname, strerror(saved_errno));
- }
- }
- }
- }
- else { /* attach a slave interface to the master */
- /* two possibilities :
- - if hwaddr_notset, do nothing. The bond will assign the
- hwaddr from it's first slave.
- - if !hwaddr_notset, assign the master's hwaddr to each slave
- */
-
- if (hwaddr_notset) { /* we do nothing */
- }
- else { /* we'll assign master's hwaddr to this slave */
- strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ);
- if (ioctl(skfd, SIOCGIFFLAGS, &ifr2) < 0) {
- int saved_errno = errno;
- fprintf(stderr, "SIOCGIFFLAGS on %s failed: %sn", slave_ifname,
- strerror(saved_errno));
- return 1;
- }
-
- if (ifr2.ifr_flags & IFF_UP) {
- ifr2.ifr_flags &= ~IFF_UP;
- if (ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
- int saved_errno = errno;
- fprintf(stderr, "Shutting down interface %s failed: %sn",
- slave_ifname, strerror(saved_errno));
- }
- }
-
- strncpy(if_hwaddr.ifr_name, slave_ifname, IFNAMSIZ);
- if (ioctl(skfd, SIOCSIFHWADDR, &if_hwaddr) < 0) {
- int saved_errno = errno;
- fprintf(stderr, "SIOCSIFHWADDR on %s failed: %sn", if_hwaddr.ifr_name,
- strerror(saved_errno));
- if (saved_errno == EBUSY)
- fprintf(stderr, " The slave device %s is busy: it must be"
- " idle before running this command.n", slave_ifname);
- else if (saved_errno == EOPNOTSUPP)
- fprintf(stderr, " The slave device you specified does not support"
- " setting the MAC address.n Your kernel likely does not"
- " support slave devices.n");
- else if (saved_errno == EINVAL)
- fprintf(stderr, " The slave device's address type does not match"
- " the master's address type.n");
- } else {
- if (verbose) {
- unsigned char *hwaddr = if_hwaddr.ifr_hwaddr.sa_data;
- printf("Slave's (%s) hardware address set to "
- "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.n", slave_ifname,
- hwaddr[0], hwaddr[1], hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
- }
- }
- }
-
- if (*spp && !strcmp(*spp, "metric")) {
- if (*++spp == NULL) {
- fprintf(stderr, usage_msg);
- exit(2);
- }
- if_metric.ifr_metric = atoi(*spp);
- strncpy(if_metric.ifr_name, slave_ifname, IFNAMSIZ);
- if (ioctl(skfd, SIOCSIFMETRIC, &if_metric) < 0) {
- fprintf(stderr, "SIOCSIFMETRIC on %s: %sn", slave_ifname,
- strerror(errno));
- goterr = 1;
- }
- spp++;
- }
-
- if (strncpy(if_ipaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
- || ioctl(skfd, SIOCSIFADDR, &if_ipaddr) < 0) {
- fprintf(stderr,
- "Something broke setting the slave's address: %s.n",
- strerror(errno));
- } else {
- if (verbose) {
- unsigned char *ipaddr = if_ipaddr.ifr_addr.sa_data;
- printf("Set the slave's (%s) IP address to %d.%d.%d.%d.n",
- slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
- }
- }
-
- if (strncpy(if_mtu.ifr_name, slave_ifname, IFNAMSIZ) <= 0
- || ioctl(skfd, SIOCSIFMTU, &if_mtu) < 0) {
- fprintf(stderr, "Something broke setting the slave MTU: %s.n",
- strerror(errno));
- } else {
- if (verbose)
- printf("Set the slave's (%s) MTU to %d.n", slave_ifname, if_mtu.ifr_mtu);
- }
-
- if (strncpy(if_dstaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
- || ioctl(skfd, SIOCSIFDSTADDR, &if_dstaddr) < 0) {
- fprintf(stderr, "Error setting the slave (%s) with SIOCSIFDSTADDR: %s.n",
- slave_ifname, strerror(errno));
- } else {
- if (verbose) {
- unsigned char *ipaddr = if_dstaddr.ifr_dstaddr.sa_data;
- printf("Set the slave's (%s) destination address to %d.%d.%d.%d.n",
- slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
- }
- }
-
- if (strncpy(if_brdaddr.ifr_name, slave_ifname, IFNAMSIZ) <= 0
- || ioctl(skfd, SIOCSIFBRDADDR, &if_brdaddr) < 0) {
- fprintf(stderr,
- "Something broke setting the slave (%s) broadcast address: %s.n",
- slave_ifname, strerror(errno));
- } else {
- if (verbose) {
- unsigned char *ipaddr = if_brdaddr.ifr_broadaddr.sa_data;
- printf("Set the slave's (%s) broadcast address to %d.%d.%d.%d.n",
- slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
- }
- }
-
- if (strncpy(if_netmask.ifr_name, slave_ifname, IFNAMSIZ) <= 0
- || ioctl(skfd, SIOCSIFNETMASK, &if_netmask) < 0) {
- fprintf(stderr,
- "Something broke setting the slave (%s) netmask: %s.n",
- slave_ifname, strerror(errno));
- } else {
- if (verbose) {
- unsigned char *ipaddr = if_netmask.ifr_netmask.sa_data;
- printf("Set the slave's (%s) netmask to %d.%d.%d.%d.n",
- slave_ifname, ipaddr[0], ipaddr[1], ipaddr[2], ipaddr[3]);
- }
- }
-
- ifr2.ifr_flags |= IFF_UP; /* the interface will need to be up to be bonded */
- if ((ifr2.ifr_flags &= ~(IFF_SLAVE | IFF_MASTER)) == 0
- || strncpy(ifr2.ifr_name, slave_ifname, IFNAMSIZ) <= 0
- || ioctl(skfd, SIOCSIFFLAGS, &ifr2) < 0) {
- fprintf(stderr,
- "Something broke setting the slave (%s) flags: %s.n",
- slave_ifname, strerror(errno));
- } else {
- if (verbose)
- printf("Set the slave's (%s) flags %4.4x.n", slave_ifname, if_flags.ifr_flags);
- }
-
- /* Do the real thing */
- if ( ! opt_r) {
- strncpy(if_flags.ifr_name, master_ifname, IFNAMSIZ);
- strncpy(if_flags.ifr_slave, slave_ifname, IFNAMSIZ);
- if (!opt_c) {
- if ((ioctl(skfd, SIOCBONDENSLAVE, &if_flags) < 0) &&
- (ioctl(skfd, BOND_ENSLAVE_OLD, &if_flags) < 0)) {
- fprintf(stderr, "SIOCBONDENSLAVE: %s.n", strerror(errno));
- }
- }
- else {
- if ((ioctl(skfd, SIOCBONDCHANGEACTIVE, &if_flags) < 0) &&
- (ioctl(skfd, BOND_CHANGE_ACTIVE_OLD, &if_flags) < 0)) {
- fprintf(stderr, "SIOCBONDCHANGEACTIVE: %s.n", strerror(errno));
- }
- }
- }
- }
- } while ( (slave_ifname = *spp++) != NULL);
- /* Close the socket. */
- (void) close(skfd);
- return(goterr);
- }
- static short mif_flags;
- /* Get the inteface configuration from the kernel. */
- static int if_getconfig(char *ifname)
- {
- struct ifreq ifr;
- int metric, mtu; /* Parameters of the master interface. */
- struct sockaddr dstaddr, broadaddr, netmask;
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFFLAGS, &ifr) < 0)
- return -1;
- mif_flags = ifr.ifr_flags;
- printf("The result of SIOCGIFFLAGS on %s is %x.n",
- ifname, ifr.ifr_flags);
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFADDR, &ifr) < 0)
- return -1;
- printf("The result of SIOCGIFADDR is %2.2x.%2.2x.%2.2x.%2.2x.n",
- ifr.ifr_addr.sa_data[0], ifr.ifr_addr.sa_data[1],
- ifr.ifr_addr.sa_data[2], ifr.ifr_addr.sa_data[3]);
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFHWADDR, &ifr) < 0)
- return -1;
- {
- /* Gotta convert from 'char' to unsigned for printf(). */
- unsigned char *hwaddr = (unsigned char *)ifr.ifr_hwaddr.sa_data;
- printf("The result of SIOCGIFHWADDR is type %d "
- "%2.2x:%2.2x:%2.2x:%2.2x:%2.2x:%2.2x.n",
- ifr.ifr_hwaddr.sa_family, hwaddr[0], hwaddr[1],
- hwaddr[2], hwaddr[3], hwaddr[4], hwaddr[5]);
- }
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFMETRIC, &ifr) < 0) {
- metric = 0;
- } else
- metric = ifr.ifr_metric;
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFMTU, &ifr) < 0)
- mtu = 0;
- else
- mtu = ifr.ifr_mtu;
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFDSTADDR, &ifr) < 0) {
- memset(&dstaddr, 0, sizeof(struct sockaddr));
- } else
- dstaddr = ifr.ifr_dstaddr;
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFBRDADDR, &ifr) < 0) {
- memset(&broadaddr, 0, sizeof(struct sockaddr));
- } else
- broadaddr = ifr.ifr_broadaddr;
- strcpy(ifr.ifr_name, ifname);
- if (ioctl(skfd, SIOCGIFNETMASK, &ifr) < 0) {
- memset(&netmask, 0, sizeof(struct sockaddr));
- } else
- netmask = ifr.ifr_netmask;
- return(0);
- }
- static void if_print(char *ifname)
- {
- char buff[1024];
- struct ifconf ifc;
- struct ifreq *ifr;
- int i;
- if (ifname == (char *)NULL) {
- ifc.ifc_len = sizeof(buff);
- ifc.ifc_buf = buff;
- if (ioctl(skfd, SIOCGIFCONF, &ifc) < 0) {
- fprintf(stderr, "SIOCGIFCONF: %sn", strerror(errno));
- return;
- }
- ifr = ifc.ifc_req;
- for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; ifr++) {
- if (if_getconfig(ifr->ifr_name) < 0) {
- fprintf(stderr, "%s: unknown interface.n",
- ifr->ifr_name);
- continue;
- }
- if (((mif_flags & IFF_UP) == 0) && !opt_a) continue;
- /*ife_print(&ife);*/
- }
- } else {
- if (if_getconfig(ifname) < 0)
- fprintf(stderr, "%s: unknown interface.n", ifname);
- }
- }
- /*
- * Local variables:
- * version-control: t
- * kept-new-versions: 5
- * c-indent-level: 4
- * c-basic-offset: 4
- * tab-width: 4
- * compile-command: "gcc -Wall -Wstrict-prototypes -O -I/usr/src/linux/include ifenslave.c -o ifenslave"
- * End:
- */