/* ifconfig.c - Configure network interface. * * Copyright 2012 Ranjan Kumar * Copyright 2012 Kyungwan Han * Reviewed by Kyungsu Kim * * Not in SUSv4. USE_IFCONFIG(NEWTOY(ifconfig, "?a", TOYFLAG_BIN)) config IFCONFIG bool "ifconfig" default n help usage: ifconfig [-a] interface [address] Configure network interface. [add ADDRESS[/PREFIXLEN]] [del ADDRESS[/PREFIXLEN]] [[-]broadcast [ADDRESS]] [[-]pointopoint [ADDRESS]] [netmask ADDRESS] [dstaddr ADDRESS] [outfill NN] [keepalive NN] [hw ether|infiniband ADDRESS] [metric NN] [mtu NN] [[-]trailers] [[-]arp] [[-]allmulti] [multicast] [[-]promisc] [txqueuelen NN] [[-]dynamic] [mem_start NN] [io_addr NN] [irq NN] [up|down] ... */ #define FOR_ifconfig #include "toys.h" #include "toynet.h" #include #include #include GLOBALS( void *if_list; ) typedef struct sockaddr_with_len { union { struct sockaddr sock; struct sockaddr_in sock_in; struct sockaddr_in6 sock_in6; }sock_u; socklen_t socklen; } sockaddr_with_len; // man netdevice struct if_list { struct if_list *next; int hw_type, mtu, metric, txqueuelen, non_virtual_iface; short flags, hasaddr; struct sockaddr addr, dstaddr, broadaddr, netmask, hwaddr; struct ifmap map; char name[IFNAMSIZ]; unsigned long long val[16]; }; #define HW_NAME_LEN 20 #define HW_TITLE_LEN 30 typedef struct _hw_info { char hw_name[HW_NAME_LEN]; char hw_title[HW_TITLE_LEN]; int hw_addrlen; } HW_INFO; #define NO_RANGE -1 #define IO_MAP_INDEX 0x100 //from kernel header ipv6.h #define IPV6_ADDR_ANY 0x0000U #define IPV6_ADDR_LOOPBACK 0x0010U #define IPV6_ADDR_LINKLOCAL 0x0020U #define IPV6_ADDR_SITELOCAL 0x0040U #define IPV6_ADDR_COMPATv4 0x0080U //for the param settings. //for ipv6 add/del struct ifreq_inet6 { struct in6_addr ifrinte6_addr; uint32_t ifrinet6_prefixlen; int ifrinet6_ifindex; }; #ifndef SIOCSKEEPALIVE # define SIOCSKEEPALIVE (SIOCDEVPRIVATE) /* Set keepalive timeout in sec */ # define SIOCGKEEPALIVE (SIOCDEVPRIVATE+1) /* Get keepalive timeout */ #endif #ifndef SIOCSOUTFILL # define SIOCSOUTFILL (SIOCDEVPRIVATE+2) /* Set outfill timeout */ # define SIOCGOUTFILL (SIOCDEVPRIVATE+3) /* Get outfill timeout */ #endif #ifndef INFINIBAND_ALEN # define INFINIBAND_ALEN 20 #endif void xioctl(int fd, int request, void *data) { if (ioctl(fd, request, data) < 0) perror_exit("ioctl %d", request); } /* * verify the host is local unix path. * if so, set the swl input param accordingly. */ static int is_host_unix(char *host, sockaddr_with_len **swl) { if (strncmp(host, "local:", 6) == 0) { struct sockaddr_un *sockun; *swl = xzalloc(sizeof(struct sockaddr_with_len)); (*swl)->socklen = sizeof(struct sockaddr_un); (*swl)->sock_u.sock.sa_family = AF_UNIX; sockun = (struct sockaddr_un *)&(*swl)->sock_u.sock; xstrncpy(sockun->sun_path, host + 6, sizeof(sockun->sun_path)); return 1; } return 0; } /* * used to converts string into int and validate the input str for invalid int value or out-of-range. */ unsigned get_strtou(char *str, char **endp, int base) { unsigned long uli; char *endptr; if(!isalnum(str[0])) { errno = ERANGE; return UINT_MAX; } errno = 0; uli = strtoul(str, &endptr, base); if(uli > UINT_MAX) { errno = ERANGE; return UINT_MAX; } if(endp) *endp = endptr; if(endptr[0]) { if(isalnum(endptr[0]) || errno) { //"123abc" or out-of-range errno = ERANGE; return UINT_MAX; } errno = EINVAL; } return uli; } /* * validate the input param (host) for valid ipv6 ip and extract port number (if there). */ static void get_host_and_port(char **host, int *port) { char *ch_ptr; char *org_host = *host; if (*host[0] == '[') { (*host)++; ch_ptr = strchr(*host, ']'); if (!ch_ptr || (ch_ptr[1] != ':' && ch_ptr[1] != '\0')) error_exit("bad address '%s'", org_host); } else { ch_ptr = strrchr(*host, ':'); //There is more than one ':' like "::1" if(ch_ptr && strchr(*host, ':') != ch_ptr) ch_ptr = NULL; } if (ch_ptr) { //pointer to ":" or "]:" int size = ch_ptr - (*host) + 1; xstrncpy(*host, *host, size); if (*ch_ptr != ':') { ch_ptr++; //skip ']' //[nn] without port if (!*ch_ptr) return; } ch_ptr++; //skip ':' to get the port number. *port = get_strtou(ch_ptr, NULL, 10); if (errno || (unsigned)*port > 65535) error_exit("bad port '%s'", org_host); } } /* * used to extract the address info from the given host ip * and update the swl param accordingly. */ static int get_socket_stream(char *host, sa_family_t af, sockaddr_with_len **swl) { struct addrinfo hints, *result, *rp; int status; memset(&hints, 0 , sizeof(struct addrinfo)); hints.ai_family = af; hints.ai_socktype = SOCK_STREAM; status = getaddrinfo(host, NULL, &hints, &result); if (status) error_exit("bad address '%s' : %s", host, gai_strerror(status)); for (rp = result; rp; rp = rp->ai_next) { if (rp->ai_family == AF_INET || rp->ai_family == AF_INET6) { *swl = xmalloc(sizeof(struct sockaddr_with_len)); (*swl)->socklen = rp->ai_addrlen; memcpy(&((*swl)->sock_u.sock), rp->ai_addr, rp->ai_addrlen); break; } } freeaddrinfo(result); return rp ? 0 : -1; } /* * use to get the socket address with the given host ip. */ sockaddr_with_len *get_sockaddr(char *host, int port, sa_family_t af) { sockaddr_with_len *swl = NULL; in_port_t port_num = htons(port); if(is_host_unix(host, &swl) && swl) return swl; //[IPV6_ip]:port_num if(host[0] == '[' || strrchr(host, ':')) get_host_and_port((char **)&host, &port); if (get_socket_stream(host, af, &swl)) return NULL; if(swl->sock_u.sock.sa_family == AF_INET) swl->sock_u.sock_in.sin_port = port_num; else if(swl->sock_u.sock.sa_family == AF_INET6) swl->sock_u.sock_in6.sin6_port = port_num; return swl; } /* * get the numeric hostname and service name, for a given socket address. */ char *address_to_name(struct sockaddr *sock) { //man page of getnameinfo. char hbuf[NI_MAXHOST] = {0,}, sbuf[NI_MAXSERV] = {0,}; int status = 0; if(sock->sa_family == AF_INET) { socklen_t len = sizeof(struct sockaddr_in); if((status = getnameinfo(sock, len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV)) == 0) return xmsprintf("%s:%s", hbuf, sbuf); else { fprintf(stderr, "getnameinfo: %s\n", gai_strerror(status)); return NULL; } } else if(sock->sa_family == AF_INET6) { socklen_t len = sizeof(struct sockaddr_in6); if((status = getnameinfo(sock, len, hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), NI_NUMERICHOST | NI_NUMERICSERV)) == 0) { //verification for resolved hostname. if(strchr(hbuf, ':')) return xmsprintf("[%s]:%s", hbuf, sbuf); else return xmsprintf("%s:%s", hbuf, sbuf); } else { fprintf(stderr, "getnameinfo: %s\n", gai_strerror(status)); return NULL; } } else if(sock->sa_family == AF_UNIX) { struct sockaddr_un *sockun = (void*)sock; return xmsprintf("local:%.*s", (int) sizeof(sockun->sun_path), sockun->sun_path); } else return NULL; } static void set_flags(int sockfd, struct ifreq *ifre, int set_flag, int reset_flag) { xioctl(sockfd, SIOCGIFFLAGS, ifre); ifre->ifr_flags = (ifre->ifr_flags & (~reset_flag)) | set_flag; xioctl(sockfd, SIOCSIFFLAGS, ifre); } static void set_mtu(int sockfd, struct ifreq *ifre, char *mtu) { ifre->ifr_mtu = strtoul(mtu, NULL, 0); xioctl(sockfd, SIOCSIFMTU, ifre); } static void set_metric(int sockfd, struct ifreq *ifre, char *metric) { ifre->ifr_metric = strtoul(metric, NULL, 0); xioctl(sockfd, SIOCSIFMETRIC, ifre); } static void set_qlen(int sockfd, struct ifreq *ifre, char *qlen) { ifre->ifr_qlen = strtoul(qlen, NULL, 0); xioctl(sockfd, SIOCSIFTXQLEN, ifre); } static void set_ipv6_addr(int sockfd, struct ifreq *ifre, char *ipv6_addr, int request, char *req_name) { char *prefix; int plen = 0; sockaddr_with_len *swl = NULL; prefix = strchr(ipv6_addr, '/'); if(prefix) { plen = get_int_value(prefix + 1, 0, 128); *prefix = '\0'; } swl = get_sockaddr(ipv6_addr, 0, AF_INET6); if(!swl) error_exit("error in resolving host name"); int sockfd6; struct ifreq_inet6 ifre6; memcpy((char *) &ifre6.ifrinte6_addr, (char *) &(swl->sock_u.sock_in6.sin6_addr), sizeof(struct in6_addr)); //Create a channel to the NET kernel. if( (sockfd6 = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) perror_exit("AF_INET6 SOCK_DGRAM", 0); xioctl(sockfd6, SIOGIFINDEX, ifre); ifre6.ifrinet6_ifindex = ifre->ifr_ifindex; ifre6.ifrinet6_prefixlen = plen; xioctl(sockfd6, request, &ifre6); if(swl != NULL) { free(swl); swl = NULL; } } static void set_address(int sockfd, char *host_name, struct ifreq *ifre, int request, char *req_name) { struct sockaddr_in sock_in; sockaddr_with_len *swl = NULL; sock_in.sin_family = AF_INET; sock_in.sin_port = 0; //Default 0.0.0.0 if(strcmp(host_name, "default") == 0) sock_in.sin_addr.s_addr = INADDR_ANY; else { swl = get_sockaddr(host_name, 0, AF_INET); if(!swl) error_exit("error in resolving host name"); sock_in.sin_addr = swl->sock_u.sock_in.sin_addr; } memcpy((char *)&ifre->ifr_addr, (char *) &sock_in, sizeof(struct sockaddr)); xioctl(sockfd, request, ifre); if(swl != NULL) { free(swl); swl = NULL; } } static int hex_to_binary(char *hw_addr, struct sockaddr *sock, int count) { int i = 0, j = 0; unsigned char nib_val, ch; char *ptr = (char *) sock->sa_data; if (count == ETH_ALEN) sock->sa_family = ARPHRD_ETHER; else if (count == INFINIBAND_ALEN) sock->sa_family = ARPHRD_INFINIBAND; else return -1; //e.g. hw_addr "62:2D:A6:9E:2D:BE" for (; *hw_addr && (i < count); i++) { if (*hw_addr == ':') hw_addr++; j = nib_val = 0; for (;j < 2; j++) { ch = *hw_addr; //0-9 = 10 chars. if (((unsigned char)(ch - '0')) < 10) ch = (ch - '0'); //a-f = 6 chars. else if (((unsigned char)((ch) - 'a')) < 6) ch = (ch - ('a'-10)); //A-F = 6 chars. else if (((unsigned char)((ch) - 'A')) < 6) ch = (ch - ('A'-10)); else if (j && (ch == ':' || ch == 0)) break; else return -1; hw_addr++; nib_val <<= 4; nib_val += ch; } *ptr++ = nib_val; } if (*hw_addr) return -1; return 0; } static void set_hw_address(int sockfd, char ***argv, struct ifreq *ifre, int request, char *req_name) { int hw_class = 0; char *hw_addr; struct sockaddr sock; char *ptr; char *hw_class_strings[] = { "ether", "infiniband", NULL }; if(strcmp(hw_class_strings[0], **argv) == 0) hw_class = 1; else if(strcmp(hw_class_strings[1], **argv) == 0) hw_class = 2; if(!hw_class || !(*argv += 1)) { errno = EINVAL; toys.exithelp++; error_exit("bad hardware class"); } memset(&sock, 0, sizeof(struct sockaddr)); hw_addr = **argv; if(hex_to_binary(hw_addr, &sock, hw_class == 1 ? ETH_ALEN : INFINIBAND_ALEN)) error_exit("bad hw-addr %s", hw_addr); ptr = (char *)&sock; memcpy( ((char *) ifre) + offsetof(struct ifreq, ifr_hwaddr), ptr, sizeof(struct sockaddr)); xioctl(sockfd, request, ifre); } static void set_memstart(int sockfd, struct ifreq *ifre, char *start_addr, int request, char *req_name) { unsigned long mem_start = strtoul(start_addr, NULL, 0); xioctl(sockfd, SIOCGIFMAP, ifre); ifre->ifr_map.mem_start = mem_start; xioctl(sockfd, request, ifre); } static void set_ioaddr(int sockfd, struct ifreq *ifre, char *baddr, int request, char *req_name) { unsigned short int base_addr = strtoul(baddr, NULL, 0); xioctl(sockfd, SIOCGIFMAP, ifre); ifre->ifr_map.base_addr = base_addr; xioctl(sockfd, request, ifre); } static void set_irq(int sockfd, struct ifreq *ifre, char *irq_val, int request, char *req_name) { unsigned short int irq = strtoul(irq_val, NULL, 0); char *ptr; struct ifmap *map; xioctl(sockfd, SIOCGIFMAP, ifre); ptr = ((char *) ifre) + offsetof(struct ifreq, ifr_map); map = (struct ifmap *)ptr; map->irq = irq; xioctl(sockfd, request, ifre); } static void add_iface_to_list(struct if_list *newnode) { struct if_list *head_ref = TT.if_list; if(!head_ref || strcmp(newnode->name, head_ref->name) < 0) { newnode->next = head_ref; head_ref = newnode; } else { struct if_list *current = head_ref; while(current->next && strcmp(current->next->name, newnode->name) < 0) current = current->next; newnode->next = current->next; current->next = newnode; } TT.if_list = (void *)head_ref; } static int get_device_info(struct if_list *il) { struct ifreq ifre; char *name = il->name; int sokfd; if ((sokfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return sokfd; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFFLAGS, &ifre) < 0) { close(sokfd); return NO_RANGE; } il->flags = ifre.ifr_flags; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFHWADDR, &ifre) >= 0) memcpy(il->hwaddr.sa_data, ifre.ifr_hwaddr.sa_data, sizeof(il->hwaddr.sa_data)); il->hw_type = ifre.ifr_hwaddr.sa_family; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFMETRIC, &ifre) >= 0) il->metric = ifre.ifr_metric; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFMTU, &ifre) >= 0) il->mtu = ifre.ifr_mtu; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFMAP, &ifre) == 0) il->map = ifre.ifr_map; strncpy(ifre.ifr_name, name, IFNAMSIZ); il->txqueuelen = NO_RANGE; if(ioctl(sokfd, SIOCGIFTXQLEN, &ifre) >= 0) il->txqueuelen = ifre.ifr_qlen; strncpy(ifre.ifr_name, name, IFNAMSIZ); ifre.ifr_addr.sa_family = AF_INET; if(!ioctl(sokfd, SIOCGIFADDR, &ifre)) { il->hasaddr = 1; il->addr = ifre.ifr_addr; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFDSTADDR, &ifre) >= 0) il->dstaddr = ifre.ifr_dstaddr; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFBRDADDR, &ifre) >= 0) il->broadaddr = ifre.ifr_broadaddr; strncpy(ifre.ifr_name, name, IFNAMSIZ); if(ioctl(sokfd, SIOCGIFNETMASK, &ifre) >= 0) il->netmask = ifre.ifr_netmask; } close(sokfd); return 0; } static void get_hw_info(int hw_type, HW_INFO *hw_info) { memset(hw_info, 0, sizeof(HW_INFO)); switch(hw_type) { case ARPHRD_LOOPBACK: //Loopback device. strncpy(hw_info->hw_name, "loop", HW_NAME_LEN); strncpy(hw_info->hw_title, "Local Loopback", HW_TITLE_LEN); hw_info->hw_addrlen = 0; break; case ARPHRD_ETHER: //Ethernet strncpy(hw_info->hw_name, "ether", HW_NAME_LEN); strncpy(hw_info->hw_title, "Ethernet", HW_TITLE_LEN); hw_info->hw_addrlen = ETH_ALEN; break; case ARPHRD_PPP: //ARPHRD_PPP strncpy(hw_info->hw_name, "ppp", HW_NAME_LEN); strncpy(hw_info->hw_title, "Point-to-Point Protocol", HW_TITLE_LEN); hw_info->hw_addrlen = 0; break; case ARPHRD_INFINIBAND: //InfiniBand strncpy(hw_info->hw_name, "infiniband", HW_NAME_LEN); strncpy(hw_info->hw_title, "InfiniBand", HW_TITLE_LEN); hw_info->hw_addrlen = 20; break; case ARPHRD_SIT: //sit0 device - IPv6-in-IPv4 strncpy(hw_info->hw_name, "sit", HW_NAME_LEN); strncpy(hw_info->hw_title, "IPv6-in-IPv4", HW_TITLE_LEN); hw_info->hw_addrlen = 0; break; case -1: strncpy(hw_info->hw_name, "unspec", HW_NAME_LEN); strncpy(hw_info->hw_title, "UNSPEC", HW_TITLE_LEN); hw_info->hw_addrlen = 0; break; default: break; } } static void print_hw_addr(int hw_type, HW_INFO hw_info, struct if_list *il) { char *address = il->hwaddr.sa_data; if(!address || !hw_info.hw_addrlen) return; xprintf("HWaddr "); if(hw_type == ARPHRD_ETHER) { int i; for (i=0; i<6; i++) xprintf(":%02X"+!i, address[i]); } } static char *get_ip_addr(struct sockaddr *skaddr) { struct sockaddr_in *sin = (struct sockaddr_in *)skaddr; if(skaddr->sa_family == 0xFFFF || !skaddr->sa_family) return "[NOT SET]"; if(sin->sin_family != AF_INET) { errno = EAFNOSUPPORT; return NULL; } return inet_ntoa(sin->sin_addr); } static void print_ip_addr(struct if_list *il) { char *af_name; int af = il->addr.sa_family; if (af == AF_INET) af_name = "inet"; else if (af == AF_INET6) af_name = "inet6"; else if (af == AF_UNSPEC) af_name = "unspec"; xprintf("%10s%s addr:%s ", " ", af_name, get_ip_addr(&il->addr)); if(il->flags & IFF_POINTOPOINT) xprintf(" P-t-P:%s ", get_ip_addr(&il->dstaddr)); if(il->flags & IFF_BROADCAST) xprintf(" Bcast:%s ", get_ip_addr(&il->broadaddr)); xprintf(" Mask:%s\n", get_ip_addr(&il->netmask)); } static void print_ip6_addr(struct if_list *il) { char iface_name[IFNAMSIZ] = {0,}; int plen, scope; FILE *fp; if(!(fp = fopen("/proc/net/if_net6", "r"))) return; while(fgets(toybuf, sizeof(toybuf), fp)) { int nitems = 0; char ipv6_addr[40] = {0,}; nitems = sscanf(toybuf, "%32s %*08x %02x %02x %*02x %15s\n", ipv6_addr+7, &plen, &scope, iface_name); if(nitems != 4) { if((nitems < 0) && feof(fp)) break; perror_exit("sscanf"); } if(strcmp(il->name, iface_name) == 0) { int i = 0; struct sockaddr_in6 sock_in6; int len = sizeof(ipv6_addr) / (sizeof ipv6_addr[0]); char *ptr = ipv6_addr+7; while((i < len-2) && (*ptr)) { ipv6_addr[i++] = *ptr++; //put ':' after 4th bit if(!((i+1) % 5)) ipv6_addr[i++] = ':'; } ipv6_addr[i+1] = '\0'; if(inet_pton(AF_INET6, ipv6_addr, (struct sockaddr *) &sock_in6.sin6_addr) > 0) { sock_in6.sin6_family = AF_INET6; if(inet_ntop(AF_INET6, &sock_in6.sin6_addr, toybuf, BUFSIZ)) { xprintf("%10sinet6 addr: %s/%d Scope:", " ", toybuf, plen); if(scope == IPV6_ADDR_ANY) xprintf(" Global"); else if(scope == IPV6_ADDR_LOOPBACK) xprintf(" Host"); else if(scope == IPV6_ADDR_LINKLOCAL) xprintf(" Link"); else if(scope == IPV6_ADDR_SITELOCAL) xprintf(" Site"); else if(scope == IPV6_ADDR_COMPATv4) xprintf(" Compat"); else xprintf("Unknown"); xputc('\n'); } } } } fclose(fp); } static void display_ifconfig(struct if_list *il) { HW_INFO hw_info; get_hw_info(il->hw_type, &hw_info); xprintf("%-9s Link encap:%s ", il->name, hw_info.hw_title); print_hw_addr(il->hw_type, hw_info, il); xputc('\n'); //print addr, p-p addr, broadcast addr and mask addr. if(il->hasaddr) print_ip_addr(il); //for ipv6 to do. print_ip6_addr(il); xprintf("%10s", " "); //print flags if (il->flags) { unsigned short mask = 1; char **s, *str[] = { "UP", "BROADCAST", "DEBUG", "LOOPBACK", "POINTOPOINT", "NOTRAILERS", "RUNNING", "NOARP", "PROMISC", "ALLMULTI", "MASTER", "SLAVE", "MULTICAST", "PORTSEL", "AUTOMEDIA", "DYNAMIC", NULL }; for(s = str; *s; s++) { if(il->flags & mask) xprintf("%s ", *s); mask = mask << 1; } } else xprintf("[NO FLAGS] "); if(!il->metric) il->metric = 1; xprintf(" MTU:%d Metric:%d", il->mtu, il->metric); if(il->non_virtual_iface) { char *label[] = {"RX bytes", "RX packets", "errors", "dropped", "overruns", "frame", 0, 0, "TX bytes", "TX packets", "errors", "dropped", "overruns", "collisions", "carrier", 0, "txqueuelen"}; signed char order[] = {-1, 1, 2, 3, 4, 5, -1, 9, 10, 11, 12, 14, -1, 13, 16, -1, 0, 8}; int i; for (i = 0; i < sizeof(order); i++) { int j = order[i]; if (j < 0) xprintf("\n%10c", ' '); else xprintf("%s:%llu ", label[j], j==16 ? (unsigned long long)il->txqueuelen : il->val[j]); } } xputc('\n'); if(il->map.irq || il->map.mem_start || il->map.dma || il->map.base_addr) { xprintf("%10c", ' '); if(il->map.irq) xprintf("Interrupt:%d ", il->map.irq); if(il->map.base_addr >= IO_MAP_INDEX) xprintf("Base address:0x%lx ", il->map.base_addr); if(il->map.mem_start) xprintf("Memory:%lx-%lx ", il->map.mem_start, il->map.mem_end); if(il->map.dma) xprintf("DMA chan:%x ", il->map.dma); xputc('\n'); } xputc('\n'); } static void readconf(void) { int num_of_req = 30; struct ifconf ifcon; struct ifreq *ifre; int num, sokfd; ifcon.ifc_buf = NULL; sokfd = socket(AF_INET, SOCK_DGRAM, 0); if(sokfd < 0) perror_exit("socket"); for (;;) { ifcon.ifc_len = sizeof(struct ifreq) * num_of_req; //Size of buffer. ifcon.ifc_buf = xrealloc(ifcon.ifc_buf, ifcon.ifc_len); xioctl(sokfd, SIOCGIFCONF, &ifcon); //in case of overflow, increase number of requests and retry. if (ifcon.ifc_len == (int)(sizeof(struct ifreq) * num_of_req)) { num_of_req += 10; continue; } break; } ifre = ifcon.ifc_req; for(num = 0; num < ifcon.ifc_len && ifre; num += sizeof(struct ifreq), ifre++) { //Escape duplicate values from the list. struct if_list *il; for(il = TT.if_list; il; il = il->next) if(!strcmp(ifre->ifr_name, il->name)) break; if(!il) { il = xzalloc(sizeof(struct if_list)); xstrncpy(il->name, ifre->ifr_name, IFNAMSIZ); add_iface_to_list(il); errno = 0; if(get_device_info(il) < 0) perror_exit("%s", il->name); } } close(sokfd); free(ifcon.ifc_buf); } static void show_iface(char *iface_name) { struct if_list *il; int i, j; FILE *fp; fp = xfopen("/proc/net/dev", "r"); for (i=0; fgets(toybuf, sizeof(toybuf), fp); i++) { char *name, *buf; if (i<2) continue; il = xzalloc(sizeof(struct if_list)); for (buf = toybuf; isspace(*buf); buf++); name = strsep(&buf, ":"); if(!buf) error_exit("bad name %s", name); xstrncpy(il->name, name, IFNAMSIZ); errno = 0; for (j=0; j<16 && !errno; j++) il->val[j] = strtoll(buf, &buf, 0); if (errno) perror_exit("bad %s at %s", name, buf); add_iface_to_list(il); il->non_virtual_iface = 1; errno = 0; if(get_device_info(il) < 0) perror_exit("%s", il->name); } fclose(fp); if(iface_name) { for(il = TT.if_list; il; il = il->next) { if(!strcmp(il->name, iface_name)) { display_ifconfig(il); break; } } //if the given interface is not in the list. if(!il) { il = xzalloc(sizeof(struct if_list)); xstrncpy(il->name, iface_name, IFNAMSIZ); errno = 0; if(get_device_info(il) < 0) perror_exit("%s", iface_name); else display_ifconfig(il); free(il); } } else { readconf(); for(il = TT.if_list; il; il = il->next) if((il->flags & IFF_UP) || (toys.optflags & FLAG_a)) display_ifconfig(il); } } void ifconfig_main(void) { char **argv = toys.optargs; if(*argv && (strcmp(*argv, "--help") == 0)) show_help(); //"ifconfig" / "ifconfig eth0" if(!argv[0] || !argv[1]) { //one or no argument show_iface(*argv); //free allocated memory. llist_traverse(TT.if_list, free); return; } //set ifconfig params. { struct ifreq ifre; int sockfd = 0; //get interface name memset(&ifre, 0, sizeof(struct ifreq)); strncpy(ifre.ifr_name, *argv, IFNAMSIZ); ifre.ifr_name[IFNAMSIZ-1] = 0; if((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) perror_exit("socket"); while(*++argv != NULL) { /* flags settings */ if (!strcmp(*argv, "up")) set_flags(sockfd, &ifre, IFF_UP | IFF_RUNNING, 0); else if (!strcmp(*argv, "down")) set_flags(sockfd, &ifre, 0, IFF_UP); else if (!strcmp(*argv, "arp")) set_flags(sockfd, &ifre, 0, IFF_NOARP); else if (!strcmp(*argv, "-arp")) set_flags(sockfd, &ifre, IFF_NOARP, 0); else if (!strcmp(*argv, "trailers")) set_flags(sockfd, &ifre, 0, IFF_NOTRAILERS); else if (!strcmp(*argv, "-trailers")) set_flags(sockfd, &ifre, IFF_NOTRAILERS, 0); else if (!strcmp(*argv, "promisc")) set_flags(sockfd, &ifre, IFF_PROMISC, 0); else if (!strcmp(*argv, "-promisc")) set_flags(sockfd, &ifre, 0, IFF_PROMISC); else if (!strcmp(*argv, "allmulti")) set_flags(sockfd, &ifre, IFF_ALLMULTI, 0); else if (!strcmp(*argv, "-allmulti")) set_flags(sockfd, &ifre, 0, IFF_ALLMULTI); else if (!strcmp(*argv, "multicast")) set_flags(sockfd, &ifre, IFF_MULTICAST, 0); else if (!strcmp(*argv, "-multicast")) set_flags(sockfd, &ifre, 0, IFF_MULTICAST); else if (!strcmp(*argv, "dynamic")) set_flags(sockfd, &ifre, IFF_DYNAMIC, 0); else if (!strcmp(*argv, "-dynamic")) set_flags(sockfd, &ifre, 0, IFF_DYNAMIC); else if (!strcmp(*argv, "-pointopoint")) set_flags(sockfd, &ifre, 0, IFF_POINTOPOINT); /*value setup */ else if (!strcmp(*argv, "pointopoint")) { if (!*++argv) show_help(); set_address(sockfd, *argv, &ifre, SIOCSIFDSTADDR, "SIOCSIFDSTADDR"); set_flags(sockfd, &ifre, IFF_POINTOPOINT, 0); } else if (!strcmp(*argv, "netmask")) { if (!*++argv) show_help(); set_address(sockfd, *argv, &ifre, SIOCSIFNETMASK, "SIOCSIFNETMASK"); } else if (!strcmp(*argv, "-broadcast")) { set_flags(sockfd, &ifre, 0, IFF_BROADCAST); } else if (!strcmp(*argv, "broadcast")) { if (!*++argv) show_help(); set_address(sockfd, *argv, &ifre, SIOCSIFBRDADDR, "SIOCSIFBRDADDR"); set_flags(sockfd, &ifre, IFF_BROADCAST, 0); } else if (!strcmp(*argv, "dstaddr")) { if (!*++argv) show_help(); set_address(sockfd, *argv, &ifre, SIOCSIFDSTADDR, "SIOCSIFDSTADDR"); } else if (!strcmp(*argv, "hw")) { if (!*++argv) show_help(); set_hw_address(sockfd, &argv, &ifre, SIOCSIFHWADDR, "SIOCSIFHWADDR"); } else if (!strcmp(*argv, "mtu")) { if (!*++argv) show_help(); set_mtu(sockfd, &ifre, *argv); } else if (!strcmp(*argv, "metric")) { if (!*++argv) show_help(); set_metric(sockfd, &ifre, *argv); } else if (!strcmp(*argv, "txqueuelen")) { if (!*++argv) show_help(); set_qlen(sockfd, &ifre, *argv); } else if (!strcmp(*argv, "keepalive")) { if (!*++argv) show_help(); ifre.ifr_data = (void *)strtoul(*argv, 0, 0); xioctl(sockfd, SIOCSKEEPALIVE, &ifre); } else if (!strcmp(*argv, "outfill")) { if (!*++argv) show_help(); ifre.ifr_data = (void *)strtoul(*argv, 0, 0); xioctl(sockfd, SIOCSOUTFILL, &ifre); } else if (!strcmp(*argv, "add")) { if (!*++argv) show_help(); set_ipv6_addr(sockfd, &ifre, *argv, SIOCSIFADDR, "SIOCSIFADDR"); } else if (!strcmp(*argv, "del")) { if (!*++argv) show_help(); set_ipv6_addr(sockfd, &ifre, *argv, SIOCDIFADDR, "SIOCDIFADDR"); } else if (!strcmp(*argv, "mem_start")) { if (!*++argv) show_help(); set_memstart(sockfd, &ifre, *argv, SIOCSIFMAP, "SIOCSIFMAP"); } else if (!strcmp(*argv, "io_addr")) { if (!*++argv) show_help(); set_ioaddr(sockfd, &ifre, *argv, SIOCSIFMAP, "SIOCSIFMAP"); } else if (!strcmp(*argv, "irq")) { if (!*++argv) show_help(); set_irq(sockfd, &ifre, *argv, SIOCSIFMAP, "SIOCSIFMAP"); } else { if (isdigit(**argv) || !strcmp(*argv, "default")) { char *iface_name = ifre.ifr_name; short int is_colon = 0; set_address(sockfd, *argv, &ifre, SIOCSIFADDR, "SIOCSIFADDR"); while (*iface_name) { if (*iface_name == ':') { is_colon = 1; break; } iface_name++; } //if the interface name is not an alias; set the flag and continue. if(!is_colon) set_flags(sockfd, &ifre, IFF_UP | IFF_RUNNING, 0); } else if (!strcmp(*argv, "inet") || !strcmp(*argv, "inet6")) continue; else { errno = EINVAL; toys.exithelp++; error_exit("bad argument"); } } } if(sockfd > 0) close(sockfd); } }