/* ifconfig.c - Configure network interface. * * Copyright 2012 Ranjan Kumar * Copyright 2012 Kyungwan Han * Reviewed by Kyungsu Kim * * Not in SUSv4. * * Obsolete fields included for historical purposes: * irq|io_addr|mem_start ADDR - micromanage obsolete hardware * outfill|keepalive INTEGER - SLIP analog dialup line quality monitoring * metric INTEGER - added to Linux 0.9.10 with comment "never used", still true USE_IFCONFIG(NEWTOY(ifconfig, "^?aS", TOYFLAG_SBIN)) config IFCONFIG bool "ifconfig" default y help usage: ifconfig [-aS] [INTERFACE [ACTION...]] Display or configure network interface. With no arguments, display active interfaces. First argument is interface to operate on, one argument by itself displays that interface. -a All interfaces displayed, not just active ones -S Short view, one line per interface Standard ACTIONs to perform on an INTERFACE: ADDR[/MASK] - set IPv4 address (1.2.3.4/5) and activate interface add|del ADDR[/LEN] - add/remove IPv6 address (1111::8888/128) up|down - activate or deactivate interface Advanced ACTIONs (default values usually suffice): default - remove IPv4 address netmask ADDR - set IPv4 netmask via 255.255.255.0 instead of /24 txqueuelen LEN - number of buffered packets before output blocks mtu LEN - size of outgoing packets (Maximum Transmission Unit) broadcast ADDR - Set broadcast address pointopoint ADDR - PPP and PPPOE use this instead of "route add default gw" hw TYPE ADDR - set hardware (mac) address (type = ether|infiniband) Flags you can set on an interface (or -remove by prefixing with -): arp - don't use Address Resolution Protocol to map LAN routes promisc - don't discard packets that aren't to this LAN hardware address multicast - force interface into multicast mode if the driver doesn't allmulti - promisc for multicast packets */ #define FOR_ifconfig #include "toys.h" #include #include GLOBALS( int sockfd; ) // Convert hostname to binary address for AF_INET or AF_INET6 // return /prefix (or range max if none) static int get_addrinfo(char *host, sa_family_t af, void *addr) { struct addrinfo hints, *result, *rp = 0; int status, len; char *from, *slash; memset(&hints, 0 , sizeof(struct addrinfo)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; slash = strchr(host, '/'); if (slash) *slash = 0; status = getaddrinfo(host, NULL, &hints, &result); if (!status) for (rp = result; rp; rp = rp->ai_next) if (rp->ai_family == af) break; if (!rp) error_exit("bad address '%s' : %s", host, gai_strerror(status)); // ai_addr isn't struct in_addr or in6_addr, it's struct sockaddr. Of course. // You'd think ipv4 and ipv6 would have some basic compatibility, but no. from = ((char *)rp->ai_addr) + 4; if (af == AF_INET6) { len = 16; from += 4; // skip "flowinfo" field ipv6 puts before address } else len = 4; memcpy(addr, from, len); freeaddrinfo(result); len = -1; if (slash) len = atolx_range(slash+1, 0, (af == AF_INET) ? 32 : 128); return len; } static void display_ifconfig(char *name, int always, unsigned long long val[]) { struct ifreq ifre; struct sockaddr_in *si = (void *)&ifre.ifr_addr; struct { int type; char *title; } types[] = { {ARPHRD_LOOPBACK, "Local Loopback"}, {ARPHRD_ETHER, "Ethernet"}, {ARPHRD_PPP, "Point-to-Point Protocol"}, {ARPHRD_INFINIBAND, "InfiniBand"}, {ARPHRD_SIT, "IPv6-in-IPv4"}, {-1, "UNSPEC"} }; int i; char *pp; FILE *fp; short flags; xstrncpy(ifre.ifr_name, name, IFNAMSIZ); if (ioctl(TT.sockfd, SIOCGIFFLAGS, &ifre)<0) perror_exit_raw(name); flags = ifre.ifr_flags; if (!always && !(flags & IFF_UP)) return; if (toys.optflags&FLAG_S) { unsigned uu = 0; int len; ioctl(TT.sockfd, SIOCGIFADDR, &ifre); len = printf("%*s %s", -9, name, inet_ntoa(si->sin_addr)); if (!ioctl(TT.sockfd, SIOCGIFNETMASK, &ifre)) uu = htonl(*(unsigned *)&(si->sin_addr)); for (i = 0; uu; i++) uu <<= 1; len += printf("/%d", i); printf("%*c", 26-len, ' '); } // query hardware type and hardware address xioctl(TT.sockfd, SIOCGIFHWADDR, &ifre); if (toys.optflags&FLAG_S) for (i=0; i<6; i++) printf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]); else { for (i=0; i < ARRAY_LEN(types)-1; i++) if (ifre.ifr_hwaddr.sa_family == types[i].type) break; xprintf("%-9s Link encap:%s ", name, types[i].title); if(ifre.ifr_hwaddr.sa_family == ARPHRD_ETHER) { xprintf("HWaddr "); for (i=0; i<6; i++) xprintf(":%02x"+!i, ifre.ifr_hwaddr.sa_data[i]); } sprintf(toybuf, "/sys/class/net/%.15s/device/driver", name); if (readlink0(toybuf, toybuf, sizeof(toybuf))>0) if ((pp = strrchr(toybuf, '/'))) xprintf(" Driver %s", pp+1); xputc('\n'); } // If an address is assigned record that. ifre.ifr_addr.sa_family = AF_INET; memset(&ifre.ifr_addr, 0, sizeof(ifre.ifr_addr)); ioctl(TT.sockfd, SIOCGIFADDR, &ifre); pp = (char *)&ifre.ifr_addr; for (i = 0; isin_family == AF_INET) ? "inet" : (si->sin_family == AF_INET6) ? "inet6" : "unspec"); for (i=0; isin_family = 0; xprintf(" %s:%s ", addr[i].name, (si->sin_family == 0xFFFF || !si->sin_family) ? "[NOT SET]" : inet_ntoa(si->sin_addr)); } } xputc('\n'); } fp = fopen(pp = "/proc/net/if_inet6", "r"); if (fp) { char iface_name[IFNAMSIZ]; int plen, iscope; while (fgets(toybuf, sizeof(toybuf), fp)) { int nitems; char ipv6_addr[40]; nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n", ipv6_addr, &plen, &iscope, iface_name); if (nitems<0 && feof(fp)) break; if (nitems != 4) perror_exit("bad %s", pp); if (!strcmp(name, iface_name)) { struct sockaddr_in6 s6; char *ptr = ipv6_addr+sizeof(ipv6_addr)-1; // convert giant hex string into colon-spearated ipv6 address by // inserting ':' every 4 characters. for (i = 32; i; i--) if ((*(ptr--) = ipv6_addr[i])) if (!(i&3)) *(ptr--) = ':'; // Convert to binary and back to get abbreviated :: version if (inet_pton(AF_INET6, ipv6_addr, (void *)&s6.sin6_addr) > 0) { if (inet_ntop(AF_INET6, &s6.sin6_addr, toybuf, sizeof(toybuf))) { char *scopes[] = {"Global","Host","Link","Site","Compat"}, *scope = "Unknown"; for (i=0; i= 0) val[16] = ifre.ifr_qlen; else val[16] = -1; for (i = 0; i= 0x100) // IO_MAP_INDEX xprintf("Base address:0x%x ", ifre.ifr_map.base_addr); if(ifre.ifr_map.mem_start) xprintf("Memory:%lx-%lx ", ifre.ifr_map.mem_start, ifre.ifr_map.mem_end); if(ifre.ifr_map.dma) xprintf("DMA chan:%x ", ifre.ifr_map.dma); xputc('\n'); } xputc('\n'); } static void show_iface(char *iface_name) { char *name; struct string_list *ifaces = 0, *sl; int i, j; FILE *fp; fp = xfopen("/proc/net/dev", "r"); for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) { char *buf = toybuf; unsigned long long val[17]; if (i<2) continue; while (isspace(*buf)) buf++; name = strsep(&buf, ":"); if(!buf) error_exit("bad name %s", name); errno = 0; for (j=0; j<16 && !errno; j++) val[j] = strtoll(buf, &buf, 0); if (errno) perror_exit("bad %s at %s", name, buf); if (iface_name) { if (!strcmp(iface_name, name)) { display_ifconfig(iface_name, 1, val); return; } } else { sl = xmalloc(sizeof(*sl)+strlen(name)+1); strcpy(sl->str, name); sl->next = ifaces; ifaces = sl; display_ifconfig(sl->str, toys.optflags & FLAG_a, val); } } fclose(fp); if (iface_name) display_ifconfig(iface_name, 1, 0); else { struct ifconf ifcon; struct ifreq *ifre; int num; // Loop until buffer's big enough ifcon.ifc_buf = NULL; for (num = 30;;num += 10) { ifcon.ifc_len = sizeof(struct ifreq)*num; ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len); xioctl(TT.sockfd, SIOCGIFCONF, &ifcon); if (ifcon.ifc_len != sizeof(struct ifreq)*num) break; } ifre = ifcon.ifc_req; for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++) { // Skip duplicates for(sl = ifaces; sl; sl = sl->next) if(!strcmp(sl->str, ifre->ifr_name)) break; if(!sl) display_ifconfig(ifre->ifr_name, toys.optflags & FLAG_a, 0); } free(ifcon.ifc_buf); } llist_traverse(ifaces, free); } // Encode offset and size of field into an int, and make result negative #define IFREQ_OFFSZ(x) -(int)((offsetof(struct ifreq, x)<<16) + sizeof(ifre.x)) void ifconfig_main(void) { char **argv = toys.optargs; struct ifreq ifre; int i; TT.sockfd = xsocket(AF_INET, SOCK_DGRAM, 0); if(toys.optc < 2) { show_iface(*argv); return; } // Open interface memset(&ifre, 0, sizeof(struct ifreq)); xstrncpy(ifre.ifr_name, *argv, IFNAMSIZ); // Perform operations on interface while(*++argv) { // Table of known operations struct argh { char *name; int on, off; // set, clear } try[] = { {0, IFF_UP|IFF_RUNNING, SIOCSIFADDR}, {"up", IFF_UP|IFF_RUNNING, 0}, {"down", 0, IFF_UP}, {"arp", 0, IFF_NOARP}, {"promisc", IFF_PROMISC, 0}, {"allmulti", IFF_ALLMULTI, 0}, {"multicast", IFF_MULTICAST, 0}, {"pointopoint", IFF_POINTOPOINT, SIOCSIFDSTADDR}, {"broadcast", IFF_BROADCAST, SIOCSIFBRDADDR}, {"netmask", 0, SIOCSIFNETMASK}, {"dstaddr", 0, SIOCSIFDSTADDR}, {"mtu", IFREQ_OFFSZ(ifr_mtu), SIOCSIFMTU}, {"keepalive", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE}, // SIOCSKEEPALIVE {"outfill", IFREQ_OFFSZ(ifr_data), SIOCDEVPRIVATE+2}, // SIOCSOUTFILL {"metric", IFREQ_OFFSZ(ifr_metric), SIOCSIFMETRIC}, {"txqueuelen", IFREQ_OFFSZ(ifr_qlen), SIOCSIFTXQLEN}, {"mem_start", IFREQ_OFFSZ(ifr_map.mem_start), SIOCSIFMAP}, {"io_addr", IFREQ_OFFSZ(ifr_map.base_addr), SIOCSIFMAP}, {"irq", IFREQ_OFFSZ(ifr_map.irq), SIOCSIFMAP}, {"inet", 0, 0}, {"inet6", 0, 0} }; char *s = *argv; int rev = (*s == '-'); s += rev; // "set hardware address" is oddball enough to special case if (!strcmp(*argv, "hw")) { char *hw_addr, *ptr, *p; struct sockaddr *sock = &ifre.ifr_hwaddr; int count = 6; ptr = p = (char *)sock->sa_data; memset(sock, 0, sizeof(struct sockaddr)); if (argv[1]) { if (!strcmp("ether", *++argv)) sock->sa_family = ARPHRD_ETHER; else if (!strcmp("infiniband", *argv)) { sock->sa_family = ARPHRD_INFINIBAND; count = 20; p = ptr = toybuf; } } if (!sock->sa_family || !argv[1]) help_exit("bad hw '%s'", *argv); hw_addr = *++argv; // Parse and verify address. while (*hw_addr && (p-ptr) < count) { int val, len = 0; if (*hw_addr == ':') hw_addr++; sscanf(hw_addr, "%2x%n", &val, &len); if (!len || len > 2) break; // 1 nibble can be set e.g. C2:79:38:95:D:A hw_addr += len; *p++ = val; } if ((p-ptr) != count || *hw_addr) error_exit("bad hw-addr '%s'", *argv); // the linux kernel's "struct sockaddr" (include/linux/socket.h in the // kernel source) only has 14 bytes of sa_data, and an infiniband address // is 20. So if we go through the ioctl, the kernel will truncate // infiniband addresses, meaning we have to go through sysfs instead. if (sock->sa_family == ARPHRD_INFINIBAND && !strchr(ifre.ifr_name, '/')) { int fd; sprintf(toybuf, "/sys/class/net/%s/address", ifre.ifr_name); fd = xopen(toybuf, O_RDWR); xwrite(fd, *argv, strlen(*argv)); close(fd); } else xioctl(TT.sockfd, SIOCSIFHWADDR, &ifre); continue; // Add/remove ipv6 address to interface } else if (!strcmp(*argv, "add") || !strcmp(*argv, "del")) { struct ifreq_inet6 { struct in6_addr addr; unsigned prefix; int index; } ifre6; int plen, fd6 = xsocket(AF_INET6, SOCK_DGRAM, 0); if (!argv[1]) help_exit("%s", *argv); plen = get_addrinfo(argv[1], AF_INET6, &ifre6.addr); if (plen < 0) plen = 128; xioctl(fd6, SIOCGIFINDEX, &ifre); ifre6.index = ifre.ifr_ifindex; ifre6.prefix = plen; xioctl(fd6, **(argv++)=='a' ? SIOCSIFADDR : SIOCDIFADDR, &ifre6); close(fd6); continue; // Iterate through table to find/perform operation } else for (i = 0; ion, off = t->off; if (!t->name) { if (isdigit(**argv) || !strcmp(*argv, "default")) argv--; else continue; } else if (strcmp(t->name, s)) continue; // Is this an SIOCSI entry? if ((off|0xff) == 0x89ff) { if (!rev) { if (!*++argv) error_exit("%s needs argument", t->name); // Assign value to ifre field and call ioctl? (via IFREQ_OFFSZ.) if (on < 0) { long l = strtoul(*argv, 0, 0); if (off == SIOCSIFMAP) xioctl(TT.sockfd, SIOCGIFMAP, &ifre); on = -on; poke((on>>16) + (char *)&ifre, l, on&15); xioctl(TT.sockfd, off, &ifre); break; } else { struct sockaddr_in *si = (struct sockaddr_in *)&ifre.ifr_addr; int mask = -1; si->sin_family = AF_INET; if (!strcmp(*argv, "default")) si->sin_addr.s_addr = INADDR_ANY; else mask = get_addrinfo(*argv, AF_INET, &si->sin_addr); xioctl(TT.sockfd, off, &ifre); // Handle /netmask if (mask >= 0) { // sin_addr probably isn't unaligned, but just in case... mask = htonl((~0)<<(32-mask)); memcpy(&si->sin_addr, &mask, 4); xioctl(TT.sockfd, SIOCSIFNETMASK, &ifre); } } } off = 0; } // Set flags if (on || off) { xioctl(TT.sockfd, SIOCGIFFLAGS, &ifre); ifre.ifr_flags &= ~(rev ? on : off); ifre.ifr_flags |= (rev ? off : on); xioctl(TT.sockfd, SIOCSIFFLAGS, &ifre); } break; } if (i == ARRAY_LEN(try)) help_exit("bad argument '%s'", *argv); } close(TT.sockfd); }