/**************************************************************************** * libs/libc/net/lib_getifaddrs.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include "libc.h" /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #undef broadaddr #define broadaddr dstaddr /**************************************************************************** * Private Type Definitions ****************************************************************************/ struct myifaddrs { struct ifaddrs addrs; char name[IF_NAMESIZE]; struct sockaddr_storage addr; struct sockaddr_storage netmask; struct sockaddr_storage dstaddr; struct sockaddr hwaddr; }; /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: getifaddrs * * Description: * The getifaddrs() function returns a linked list of ifaddrs structures, * each containing information about one of the network interfaces on the * local system. The ifaddrs structure contains at least the following * entries: * struct ifaddrs *ifa_next; * char *ifa_name; * unsigned int ifa_flags; * struct sockaddr *ifa_addr; * struct sockaddr *ifa_netmask; * struct sockaddr *ifa_dstaddr; * void *ifa_data; * The ifa_next field contains a pointer to the next structure on * the list, or NULL if this is the last item of the list. * * The ifa_name points to the null-terminated interface name. * * The ifa_flags field contains the interface flags, as returned by * the SIOCGIFFLAGS ioctl(2) operation (see netdevice(7) for a list * of these flags). * * The ifa_addr field points to a structure containing the interface * address. (The sa_family subfield should be consulted to * determine the format of the address structure.) This field may * contain a null pointer. * * The ifa_netmask field points to a structure containing the * netmask associated with ifa_addr, if applicable for the address * family. This field may contain a null pointer. * * Depending on whether the bit IFF_BROADCAST or IFF_POINTOPOINT is * set in ifa_flags (only one can be set at a time), either * ifa_broadaddr will contain the broadcast address associated with * ifa_addr (if applicable for the address family) or ifa_dstaddr * will contain the destination address of the point-to-point * interface. * * The ifa_data field points to a buffer containing address-family- * specific data; this field may be NULL if there is no such data * for this interface. * * Input Parameters: * None * * Returned Value: * On success, getifaddrs() returns pointer to the linked list; on error, * NULL is returned, and errno is set to indicate the error. * ****************************************************************************/ int getifaddrs(FAR struct ifaddrs **addrs) { FAR struct myifaddrs *myaddrs = NULL; int sockfd; int i; if (addrs == NULL) { set_errno(EINVAL); return ERROR; } sockfd = socket(NET_SOCK_FAMILY, NET_SOCK_TYPE, NET_SOCK_PROTOCOL); if (sockfd < 0) { return sockfd; } for (i = 1, *addrs = NULL; i <= MAX_IFINDEX; i++) { unsigned int flags; struct lifreq req; memset(&req, 0, sizeof(req)); req.lifr_ifindex = i; if (ioctl(sockfd, SIOCGIFNAME, (unsigned long)&req) < 0) { continue; /* Empty slot, try next one */ } if (ioctl(sockfd, SIOCGIFFLAGS, (unsigned long)&req) < 0) { goto err; } flags = req.lifr_flags; if (myaddrs != NULL) { myaddrs->addrs.ifa_next = lib_zalloc(sizeof(*myaddrs)); myaddrs = (FAR struct myifaddrs *)myaddrs->addrs.ifa_next; } else { *addrs = lib_zalloc(sizeof(*myaddrs)); myaddrs = (FAR struct myifaddrs *)*addrs; } if (myaddrs == NULL) { goto err; } myaddrs->addrs.ifa_name = myaddrs->name; strncpy(myaddrs->name, req.lifr_name, IF_NAMESIZE); myaddrs->addrs.ifa_flags = flags; #ifdef CONFIG_NET_IPv4 if (ioctl(sockfd, SIOCGIFADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_addr = (FAR struct sockaddr *)&myaddrs->addr; memcpy(&myaddrs->addr, &req.lifr_addr, sizeof(req.lifr_addr)); if (ioctl(sockfd, SIOCGIFNETMASK, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_netmask = (FAR struct sockaddr *)&myaddrs->netmask; memcpy(&myaddrs->netmask, &req.lifr_netmask, sizeof(req.lifr_netmask)); } if (ioctl(sockfd, SIOCGIFDSTADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_dstaddr = (FAR struct sockaddr *)&myaddrs->dstaddr; memcpy(&myaddrs->dstaddr, &req.lifr_dstaddr, sizeof(req.lifr_dstaddr)); } else if (ioctl(sockfd, SIOCGIFBRDADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_broadaddr = (FAR struct sockaddr *)&myaddrs->broadaddr; memcpy(&myaddrs->broadaddr, &req.lifr_broadaddr, sizeof(req.lifr_broadaddr)); } if (ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_data = &myaddrs->hwaddr; memcpy(&myaddrs->hwaddr, &req.lifr_hwaddr, sizeof(req.lifr_hwaddr)); } } #endif #ifdef CONFIG_NET_IPv6 if (ioctl(sockfd, SIOCGLIFADDR, (unsigned long)&req) >= 0) { /* Has IPv4 entry ? */ if (myaddrs->addrs.ifa_addr) { /* Yes, allocate the new entry for IPv6 */ myaddrs->addrs.ifa_next = lib_zalloc(sizeof(*myaddrs)); myaddrs = (FAR struct myifaddrs *)myaddrs->addrs.ifa_next; if (myaddrs == NULL) { goto err; } myaddrs->addrs.ifa_name = myaddrs->name; strncpy(myaddrs->name, req.lifr_name, IF_NAMESIZE); myaddrs->addrs.ifa_flags = flags; } myaddrs->addrs.ifa_addr = (FAR struct sockaddr *)&myaddrs->addr; memcpy(&myaddrs->addr, &req.lifr_addr, sizeof(req.lifr_addr)); if (ioctl(sockfd, SIOCGLIFNETMASK, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_netmask = (FAR struct sockaddr *)&myaddrs->netmask; memcpy(&myaddrs->netmask, &req.lifr_netmask, sizeof(req.lifr_netmask)); } if (ioctl(sockfd, SIOCGLIFDSTADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_dstaddr = (FAR struct sockaddr *)&myaddrs->dstaddr; memcpy(&myaddrs->dstaddr, &req.lifr_dstaddr, sizeof(req.lifr_dstaddr)); } else if (ioctl(sockfd, SIOCGLIFBRDADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_broadaddr = (FAR struct sockaddr *)&myaddrs->broadaddr; memcpy(&myaddrs->broadaddr, &req.lifr_broadaddr, sizeof(req.lifr_broadaddr)); } if (ioctl(sockfd, SIOCGIFHWADDR, (unsigned long)&req) >= 0) { myaddrs->addrs.ifa_data = &myaddrs->hwaddr; memcpy(&myaddrs->hwaddr, &req.lifr_hwaddr, sizeof(req.lifr_hwaddr)); } } #endif } close(sockfd); return OK; err: if (*addrs != NULL) { freeifaddrs(*addrs); *addrs = NULL; } close(sockfd); return ERROR; }