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- /**
- * nmrpflash - Netgear Unbrick Utility
- * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
- *
- * nmrpflash 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, either version 3 of the License, or
- * (at your option) any later version.
- *
- * nmrpflash is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with nmrpflash. If not, see <http://www.gnu.org/licenses/>.
- *
- */
- #include <sys/types.h>
- #include <stdbool.h>
- #include <stdarg.h>
- #include <string.h>
- #include <stdlib.h>
- #include <stdio.h>
- #include <fcntl.h>
- #include "nmrpd.h"
- #if defined(NMRPFLASH_WINDOWS)
- #define NMRPFLASH_NETALIAS_PREFIX "net"
- #define WPCAP
- #include <pcap.h>
- #else
- #include <sys/ioctl.h>
- #include <ifaddrs.h>
- #include <unistd.h>
- #include <net/if.h>
- #include <pcap.h>
- #if defined(NMRPFLASH_LINUX)
- #define NMRPFLASH_AF_PACKET AF_PACKET
- #include <linux/if_packet.h>
- #include <netlink/route/addr.h>
- #include <netlink/route/neighbour.h>
- #else
- #define NMRPFLASH_AF_PACKET AF_LINK
- #include <net/if_types.h>
- #include <net/if_media.h>
- #endif
- #endif
- struct ethsock
- {
- const char *intf;
- pcap_t *pcap;
- #ifndef NMRPFLASH_WINDOWS
- int fd;
- #ifdef NMRPFLASH_LINUX
- bool stp;
- #endif
- #else
- HANDLE handle;
- DWORD index;
- #endif
- unsigned timeout;
- uint8_t hwaddr[6];
- };
- struct ethsock_arp_undo
- {
- uint32_t ipaddr;
- uint8_t hwaddr[6];
- };
- struct ethsock_ip_undo
- {
- #ifndef NMRPFLASH_WINDOWS
- uint32_t ip[2];
- #else
- ULONG context;
- #endif
- };
- const char *mac_to_str(uint8_t *mac)
- {
- static char buf[18];
- snprintf(buf, sizeof(buf), "%02x:%02x:%02x:%02x:%02x:%02x",
- mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
- return buf;
- }
- static int x_pcap_findalldevs(pcap_if_t **devs)
- {
- char errbuf[PCAP_ERRBUF_SIZE];
- if (pcap_findalldevs(devs, errbuf) != 0) {
- fprintf(stderr, "%s.\n", errbuf);
- return -1;
- }
- return 0;
- }
- static int systemf(const char *fmt, ...)
- {
- char cmd[1024];
- int ret;
- va_list va;
- va_start(va, fmt);
- ret = vsnprintf(cmd, sizeof(cmd) - 1, fmt, va);
- if (ret >= sizeof(cmd) - 1) {
- return -1;
- }
- ret = system(cmd);
- va_end(va);
- return ret;
- }
- #ifndef NMRPFLASH_WINDOWS
- static inline bool sockaddr_get_hwaddr(struct sockaddr *sa, uint8_t *hwaddr)
- {
- void *src;
- if (sa->sa_family != NMRPFLASH_AF_PACKET) {
- return false;
- }
- #ifndef NMRPFLASH_LINUX
- if (((struct sockaddr_dl*)sa)->sdl_type != IFT_ETHER) {
- return false;
- }
- src = LLADDR((struct sockaddr_dl*)sa);
- #else
- src = ((struct sockaddr_ll*)sa)->sll_addr;
- #endif
- memcpy(hwaddr, src, 6);
- return true;
- }
- #ifdef NMRPFLASH_LINUX
- static int bridge_stp_state(const char *intf)
- {
- char name[256];
- snprintf(name, sizeof(name), "/sys/class/net/%s/bridge/stp_state", intf);
- return open(name, O_RDWR, 0644);
- }
- static bool bridge_stp_enabled(const char *intf)
- {
- char c;
- int fd = bridge_stp_state(intf);
- if (fd == -1) {
- return false;
- }
- if (read(fd, &c, 1) != 1) {
- c = '0';
- }
- close(fd);
- return c == '1';
- }
- static bool bridge_stp(const char *intf, bool enabled)
- {
- bool ret;
- const char *s = enabled ? "1\n" : "0\n";
- int fd = bridge_stp_state(intf);
- if (fd == -1) {
- return false;
- }
- ret = (write(fd, s, 2) == 2);
- close(fd);
- return ret;
- }
- static bool xrtnl_addr_set(struct rtnl_addr *ra, uint32_t addr, int (*cb)(struct rtnl_addr*, struct nl_addr*))
- {
- int err;
- struct nl_addr *na = nl_addr_build(AF_INET, &addr, 4);
- if (!na) {
- xperror("nl_addr_build");
- return false;
- }
- if ((err = cb(ra, na)) != 0 && verbosity) {
- nl_perror(err, __func__);
- }
- nl_addr_put(na);
- return true;
- }
- static struct nl_sock *xnl_socket_route()
- {
- int err;
- struct nl_sock *sk = nl_socket_alloc();
- if (sk) {
- if (!(err = nl_connect(sk, NETLINK_ROUTE))) {
- return sk;
- }
- nl_socket_free(sk);
- nl_perror(err, "nl_connect");
- } else {
- xperror("nl_socket_alloc");
- }
- return NULL;
- }
- static bool intf_add_del_ip(const char *intf, uint32_t ipaddr, uint32_t ipmask, bool add)
- {
- struct rtnl_addr *ra = NULL;
- struct nl_sock *sk = NULL;
- int err = 1;
- if (!(sk = xnl_socket_route())) {
- return false;
- }
- if (!(ra = rtnl_addr_alloc())) {
- xperror("rtnl_addr_alloc");
- goto out;
- }
- rtnl_addr_set_ifindex(ra, if_nametoindex(intf));
- rtnl_addr_set_prefixlen(ra, bitcount(ipmask));
- if (!xrtnl_addr_set(ra, (ipaddr & ipmask) | ~ipmask, &rtnl_addr_set_broadcast)
- || !xrtnl_addr_set(ra, ipaddr, &rtnl_addr_set_local)) {
- goto out;
- }
- if ((err = add ? rtnl_addr_add(sk, ra, 0) : rtnl_addr_delete(sk, ra, 0)) < 0) {
- if (add && err == -NLE_EXIST) {
- err = 0;
- } else if (add || verbosity > 1) {
- nl_perror(err, add ? "rtnl_addr_add" : "rtnl_addr_delete");
- }
- }
- out:
- rtnl_addr_put(ra);
- nl_socket_free(sk);
- return !err;
- }
- static bool intf_add_del_arp(const char *intf, uint32_t ipaddr, uint8_t *hwaddr, bool add)
- {
- struct nl_sock *sk;
- struct rtnl_neigh *neigh;
- struct nl_addr *mac, *ip;
- int err = 1;
- sk = NULL;
- neigh = NULL;
- mac = ip = NULL;
- if (!(sk = xnl_socket_route())) {
- goto out;
- }
- if (!(neigh = rtnl_neigh_alloc())) {
- xperror("rtnl_neigh_alloc");
- goto out;
- }
- if (!(mac = nl_addr_build(AF_PACKET, hwaddr, 6))) {
- xperror("nl_addr_build");
- goto out;
- }
- if (!(ip = nl_addr_build(AF_INET, &ipaddr, 4))) {
- xperror("nl_addr_build");
- goto out;
- }
- rtnl_neigh_set_ifindex(neigh, if_nametoindex(intf));
- rtnl_neigh_set_dst(neigh, ip);
- err = rtnl_neigh_delete(sk, neigh, 0);
- if (add) {
- rtnl_neigh_set_lladdr(neigh, mac);
- rtnl_neigh_set_state(neigh, NUD_PERMANENT);
- err = rtnl_neigh_add(sk, neigh, NLM_F_CREATE);
- }
- if (err && (add || verbosity > 1)) {
- nl_perror(err, add ? "rtnl_neigh_add" : "rtnl_neigh_delete");
- }
- out:
- nl_addr_put(ip);
- nl_addr_put(mac);
- rtnl_neigh_put(neigh);
- nl_socket_free(sk);
- return !err;
- }
- #endif
- static bool intf_get_info(const char *intf, uint8_t *hwaddr, bool *bridge)
- {
- struct ifaddrs *ifas, *ifa;
- bool found;
- if (getifaddrs(&ifas) != 0) {
- xperror("getifaddrs");
- return false;
- }
- found = false;
- if (bridge) {
- *bridge = false;
- }
- for (ifa = ifas; ifa; ifa = ifa->ifa_next) {
- if (!strcmp(ifa->ifa_name, intf)) {
- if (sockaddr_get_hwaddr(ifa->ifa_addr, hwaddr)) {
- #ifdef NMRPFLASH_BSD
- if (bridge) {
- *bridge = ((struct if_data*) ifa->ifa_data)->ifi_type == IFT_BRIDGE;
- }
- #endif
- found = true;
- break;
- }
- }
- }
- freeifaddrs(ifas);
- return found;
- }
- #else
- void win_perror2(const char *msg, DWORD err)
- {
- char *buf = NULL;
- FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
- FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
- NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
- (LPTSTR)&buf, 0, NULL);
- if (buf) {
- /* FormatMessageA terminates buf with CRLF! */
- fprintf(stderr, "%s: %s", msg, buf);
- LocalFree(buf);
- } else {
- fprintf(stderr, "%s: error %d\n", msg, (int)err);
- }
- }
- static bool intf_get_info(const char *intf, uint8_t *hwaddr, DWORD *index)
- {
- PIP_ADAPTER_INFO adapters, adapter;
- DWORD ret;
- ULONG i, bufLen = 0;
- bool found = false;
- if ((ret = GetAdaptersInfo(NULL, &bufLen)) != ERROR_BUFFER_OVERFLOW) {
- win_perror2("GetAdaptersInfo", ret);
- return false;
- }
- adapters = malloc(bufLen);
- if (!adapters) {
- xperror("malloc");
- return false;
- }
- if ((ret = GetAdaptersInfo(adapters, &bufLen) == NO_ERROR)) {
- for (adapter = adapters; adapter; adapter = adapter->Next) {
- if (adapter->Type != MIB_IF_TYPE_ETHERNET && adapter->Type != IF_TYPE_IEEE80211) {
- continue;
- }
- /* Interface names from WinPcap are "\Device\NPF_{GUID}", while
- * AdapterName from GetAdaptersInfo is just "{GUID}".*/
- if (strstr(intf, adapter->AdapterName)) {
- if (adapter->AddressLength == 6) {
- memcpy(hwaddr, adapter->Address, 6);
- if (index) {
- *index = adapter->Index;
- }
- found = true;
- break;
- }
- }
- }
- } else {
- win_perror2("GetAdaptersInfo", ret);
- }
- free(adapters);
- return found;
- }
- static const char *intf_alias_to_wpcap(const char *intf)
- {
- static char buf[128];
- pcap_if_t *devs, *dev;
- unsigned i = 0, dev_num = 0;
- if (intf[0] == '\\') {
- return intf;
- } else if (sscanf(intf, NMRPFLASH_NETALIAS_PREFIX "%u", &dev_num) != 1) {
- fprintf(stderr, "Invalid interface alias.\n");
- return NULL;
- }
- if (x_pcap_findalldevs(&devs) != 0) {
- return NULL;
- }
- for (dev = devs; dev; dev = dev->next, ++i) {
- if (i == dev_num) {
- if (verbosity) {
- printf("%s%u: %s\n", NMRPFLASH_NETALIAS_PREFIX, i, dev->name);
- }
- strncpy(buf, dev->name, sizeof(buf) - 1);
- buf[sizeof(buf) - 1] = '\0';
- break;
- }
- }
- pcap_freealldevs(devs);
- if (!dev) {
- fprintf(stderr, "Interface alias not found.\n");
- return NULL;
- }
- return buf;
- }
- static const char *intf_get_pretty_name(const char *intf)
- {
- static char buf[512];
- char *guid;
- HKEY hkey;
- LONG err;
- DWORD len;
- guid = strstr(intf, "NPF_{");
- if (!guid) {
- return NULL;
- }
- guid += 4;
- snprintf(buf, sizeof(buf),
- "System\\CurrentControlSet\\Control\\Network\\"
- "{4D36E972-E325-11CE-BFC1-08002BE10318}\\"
- "%s\\Connection", guid);
- err = RegOpenKeyExA(HKEY_LOCAL_MACHINE, buf, 0, KEY_READ, &hkey);
- if (err != ERROR_SUCCESS) {
- if (verbosity > 1) {
- win_perror2("RegOpenKeyExA", err);
- }
- return NULL;
- }
- len = sizeof(buf);
- err = RegQueryValueExA(hkey, "Name", NULL, NULL, (LPBYTE)buf, &len);
- if (err == ERROR_SUCCESS) {
- intf = buf;
- } else {
- if (verbosity > 1) {
- win_perror2("RegQueryValueExA", err);
- }
- intf = NULL;
- }
- RegCloseKey(hkey);
- return intf;
- }
- #endif
- inline uint8_t *ethsock_get_hwaddr(struct ethsock *sock)
- {
- return sock->hwaddr;
- }
- struct ethsock *ethsock_create(const char *intf, uint16_t protocol)
- {
- char buf[PCAP_ERRBUF_SIZE];
- struct bpf_program fp;
- struct ethsock *sock;
- bool is_bridge;
- int err;
- #ifdef NMRPFLASH_WINDOWS
- intf = intf_alias_to_wpcap(intf);
- if (!intf) {
- return NULL;
- }
- #endif
- sock = malloc(sizeof(struct ethsock));
- if (!sock) {
- xperror("malloc");
- return NULL;
- }
- buf[0] = '\0';
- sock->intf = intf;
- sock->pcap = pcap_open_live(sock->intf, BUFSIZ, 1, 1, buf);
- if (!sock->pcap) {
- fprintf(stderr, "%s.\n", buf);
- goto cleanup;
- }
- if (*buf) {
- fprintf(stderr, "Warning: %s.\n", buf);
- }
- if (pcap_datalink(sock->pcap) != DLT_EN10MB) {
- fprintf(stderr, "%s is not an ethernet interface.\n",
- intf);
- goto cleanup;
- }
- #ifndef NMRPFLASH_WINDOWS
- err = !intf_get_info(intf, sock->hwaddr, &is_bridge);
- #else
- err = !intf_get_info(intf, sock->hwaddr, &sock->index);
- #endif
- if (err) {
- fprintf(stderr, "Failed to get interface info.\n");
- goto cleanup;
- }
- #ifndef NMRPFLASH_WINDOWS
- sock->fd = pcap_get_selectable_fd(sock->pcap);
- if (sock->fd == -1) {
- pcap_perror(sock->pcap, "pcap_get_selectable_fd");
- goto cleanup;
- }
- #else
- sock->handle = pcap_getevent(sock->pcap);
- if (!sock->handle) {
- pcap_perror(sock->pcap, "pcap_getevent");
- goto cleanup;
- }
- err = pcap_setmintocopy(sock->pcap, 1);
- if (err) {
- pcap_perror(sock->pcap, "pcap_setmintocopy");
- goto cleanup;
- }
- #endif
- snprintf(buf, sizeof(buf), "ether proto 0x%04x and not ether src %s",
- protocol, mac_to_str(sock->hwaddr));
- err = pcap_compile(sock->pcap, &fp, buf, 0, 0);
- if (err) {
- pcap_perror(sock->pcap, "pcap_compile");
- goto cleanup;
- }
- err = pcap_setfilter(sock->pcap, &fp);
- pcap_freecode(&fp);
- if (err) {
- pcap_perror(sock->pcap, "pcap_setfilter");
- goto cleanup;
- }
- #ifdef NMRPFLASH_LINUX
- // nmrpflash does not work on bridge interfaces with STP enabled
- if ((sock->stp = bridge_stp_enabled(intf))) {
- if (!bridge_stp(intf, false)) {
- fprintf(stderr, "Warning: failed to disable STP on %s.\n", intf);
- }
- }
- #else
- if (is_bridge) {
- fprintf(stderr, "Warning: bridge interfaces are not fully "
- "supported on this platform.\n");
- }
- #endif
- return sock;
- cleanup:
- ethsock_close(sock);
- return NULL;
- }
- int select_fd(int fd, unsigned timeout)
- {
- struct timeval tv;
- int status;
- fd_set fds;
- FD_ZERO(&fds);
- FD_SET(fd, &fds);
- tv.tv_sec = timeout / 1000;
- tv.tv_usec = 1000 * (timeout % 1000);
- status = select(fd + 1, &fds, NULL, NULL, &tv);
- if (status < 0) {
- sock_perror("select");
- }
- return status;
- }
- ssize_t ethsock_recv(struct ethsock *sock, void *buf, size_t len)
- {
- struct pcap_pkthdr* hdr;
- const u_char *capbuf;
- int status;
- #ifdef NMRPFLASH_WINDOWS
- DWORD ret;
- if (sock->timeout) {
- ret = WaitForSingleObject(sock->handle, sock->timeout);
- if (ret == WAIT_TIMEOUT) {
- return 0;
- } else if (ret != WAIT_OBJECT_0) {
- win_perror2("WaitForSingleObject", ret);
- return -1;
- }
- }
- #else
- if (sock->timeout) {
- status = select_fd(sock->fd, sock->timeout);
- if (status < 0) {
- return -1;
- } else if (status == 0) {
- return 0;
- }
- }
- #endif
- status = pcap_next_ex(sock->pcap, &hdr, &capbuf);
- switch (status) {
- case 1:
- memcpy(buf, capbuf, MIN(len, hdr->caplen));
- return hdr->caplen;
- case 0:
- return 0;
- case -1:
- pcap_perror(sock->pcap, "pcap_next_ex");
- return -1;
- default:
- fprintf(stderr, "pcap_next_ex: returned %d.\n", status);
- return -1;
- }
- }
- int ethsock_send(struct ethsock *sock, void *buf, size_t len)
- {
- #ifdef NMRPFLASH_WINDOWS
- if (pcap_sendpacket(sock->pcap, buf, len) == 0) {
- return 0;
- } else {
- pcap_perror(sock->pcap, "pcap_sendpacket");
- return -1;
- }
- #else
- if (pcap_inject(sock->pcap, buf, len) == len) {
- return 0;
- } else {
- pcap_perror(sock->pcap, "pcap_inject");
- return -1;
- }
- #endif
- }
- int ethsock_close(struct ethsock *sock)
- {
- if (!sock) {
- return 0;
- }
- #ifdef NMRPFLASH_LINUX
- if (sock->stp) {
- bridge_stp(sock->intf, true);
- }
- #endif
- if (sock->pcap) {
- pcap_close(sock->pcap);
- }
- free(sock);
- return 0;
- }
- inline int ethsock_set_timeout(struct ethsock *sock, unsigned msec)
- {
- sock->timeout = msec;
- return 0;
- }
- static int ethsock_arp(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
- {
- #if defined(NMRPFLASH_UNIX) && !defined(NMRPFLASH_LINUX)
- struct in_addr addr = { .s_addr = ipaddr };
- #elif defined(NMRPFLASH_WINDOWS)
- DWORD err;
- MIB_IPNETROW arp = {
- .dwIndex = sock->index,
- .dwPhysAddrLen = 6,
- .dwAddr = ipaddr,
- .dwType = MIB_IPNET_TYPE_STATIC
- };
- memcpy(arp.bPhysAddr, hwaddr, 6);
- #endif
- if (undo) {
- #if defined(NMRPFLASH_LINUX)
- if (!intf_add_del_arp(sock->intf, ipaddr, hwaddr, true)) {
- return -1;
- }
- #elif defined(NMRPFLASH_WINDOWS)
- err = CreateIpNetEntry(&arp);
- if (err != NO_ERROR) {
- win_perror2("CreateIpNetEntry", err);
- return -1;
- }
- #else
- if (systemf("arp -s %s %s", inet_ntoa(addr), mac_to_str(hwaddr)) != 0) {
- return -1;
- }
- #endif
- *undo = malloc(sizeof(struct ethsock_arp_undo));
- if (!*undo) {
- xperror("malloc");
- return -1;
- }
- (*undo)->ipaddr = ipaddr;
- memcpy((*undo)->hwaddr, hwaddr, 6);
- } else {
- #if defined(NMRPFLASH_LINUX)
- if (!intf_add_del_arp(sock->intf, ipaddr, hwaddr, false)) {
- return -1;
- }
- #elif defined(NMRPFLASH_WINDOWS)
- return DeleteIpNetEntry(&arp) ? 0 : -1;
- #else
- return systemf("arp -d %s", inet_ntoa(addr));
- #endif
- }
- return 0;
- }
- int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
- {
- ethsock_arp(sock, hwaddr, ipaddr, NULL);
- return undo ? ethsock_arp(sock, hwaddr, ipaddr, undo) : -1;
- }
- int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
- {
- if (!*undo) {
- return 0;
- }
- int ret = ethsock_arp(sock, (*undo)->hwaddr, (*undo)->ipaddr, NULL);
- free(*undo);
- *undo = NULL;
- return ret;
- }
- static bool get_hwaddr_from_pcap(const pcap_if_t *dev, uint8_t *hwaddr)
- {
- #ifndef NMRPFLASH_WINDOWS
- pcap_addr_t *addr;
- int i;
- for (addr = dev->addresses; addr; addr = addr->next) {
- if (verbosity > 1) {
- printf("%s: sa_family=%d, sa_data={ ", dev->name,
- addr->addr->sa_family);
- for (i = 0; i != sizeof(addr->addr->sa_data); ++i) {
- printf("%02x ", addr->addr->sa_data[i] & 0xff);
- }
- printf("}\n");
- }
- if (sockaddr_get_hwaddr(addr->addr, hwaddr)) {
- return true;
- }
- }
- #endif
- return intf_get_info(dev->name, hwaddr, NULL);
- }
- int ethsock_list_all(void)
- {
- pcap_if_t *devs, *dev;
- pcap_addr_t *addr;
- uint8_t hwaddr[6];
- unsigned dev_num = 0, dev_ok = 0;
- #ifdef NMRPFLASH_WINDOWS
- const char *pretty;
- #endif
- if (x_pcap_findalldevs(&devs) != 0) {
- return -1;
- }
- memset(hwaddr, 0, 6);
- for (dev = devs; dev; dev = dev->next, ++dev_num) {
- if (dev->flags & PCAP_IF_LOOPBACK) {
- if (verbosity) {
- printf("%-15s (loopback device)\n", dev->name);
- }
- continue;
- }
- if (!get_hwaddr_from_pcap(dev, hwaddr)) {
- if (verbosity) {
- printf("%-15s (not an ethernet device)\n",
- dev->name);
- }
- continue;
- }
- #ifndef NMRPFLASH_WINDOWS
- printf("%-15s", dev->name);
- #else
- /* Call this here so *_perror() calls don't happen within a line */
- pretty = intf_get_pretty_name(dev->name);
- if (!verbosity) {
- printf("%s%-2u", NMRPFLASH_NETALIAS_PREFIX, dev_num);
- } else {
- printf("%s", dev->name);
- }
- #endif
- for (addr = dev->addresses; addr; addr = addr->next) {
- if (addr->addr->sa_family == AF_INET) {
- printf(" %-15s",
- inet_ntoa(((struct sockaddr_in*)addr->addr)->sin_addr));
- break;
- }
- }
- if (!addr) {
- printf(" %-15s", "0.0.0.0");
- }
- printf(" %s", mac_to_str(hwaddr));
- #ifdef NMRPFLASH_WINDOWS
- if (pretty) {
- printf(" (%s)", pretty);
- } else if (dev->description) {
- printf(" (%s)", dev->description);
- }
- #endif
- printf("\n");
- ++dev_ok;
- }
- if (!dev_ok) {
- printf("No suitable network interfaces found.\n");
- }
- return 0;
- }
- int ethsock_for_each_ip(struct ethsock *sock, ethsock_ip_callback_t callback,
- void *arg)
- {
- struct ethsock_ip_callback_args args;
- pcap_if_t *devs, *dev;
- pcap_addr_t *addr;
- int status = 0;
- if (x_pcap_findalldevs(&devs) != 0) {
- return -1;
- }
- args.arg = arg;
- for (dev = devs; dev; dev = dev->next) {
- if (strcmp(sock->intf, dev->name)) {
- continue;
- }
- for (addr = dev->addresses; addr; addr = addr->next) {
- if (addr->addr->sa_family == AF_INET) {
- args.ipaddr = &((struct sockaddr_in*)addr->addr)->sin_addr;
- args.ipmask = &((struct sockaddr_in*)addr->netmask)->sin_addr;
- status = callback(&args);
- if (status <= 0) {
- break;
- }
- }
- }
- break;
- }
- pcap_freealldevs(devs);
- return status <= 0 ? status : 0;
- }
- static inline void set_addr(void *p, uint32_t addr)
- {
- struct sockaddr_in* sin = p;
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = addr;
- #ifdef NMRPFLASH_BSD
- ((struct sockaddr*)p)->sa_len = sizeof(struct sockaddr_in);
- #endif
- }
- #if !defined(NMRPFLASH_WINDOWS) && !defined(NMRPFLASH_LINUX)
- static bool intf_up(int fd, const char *intf, bool up)
- {
- struct ifreq ifr;
- strncpy(ifr.ifr_name, intf, IFNAMSIZ);
- if (ioctl(fd, SIOCGIFFLAGS, &ifr) != 0) {
- if (up) {
- xperror("ioctl(SIOCGIFFLAGS)");
- }
- return false;
- }
- if (!up) {
- ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
- } else {
- ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
- }
- if (ioctl(fd, SIOCSIFFLAGS, &ifr) != 0) {
- if (up) {
- xperror("ioctl(SIOCSIFFLAGS)");
- }
- return false;
- }
- return true;
- }
- #endif
- static int ethsock_ip_add_del(struct ethsock *sock, uint32_t ipaddr, uint32_t ipmask, struct ethsock_ip_undo **undo, bool add)
- {
- int ret, fd;
- if (add && undo) {
- if (!(*undo = malloc(sizeof(struct ethsock_ip_undo)))) {
- xperror("malloc");
- return -1;
- }
- memset(*undo, 0, sizeof(**undo));
- }
- ret = -1;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- if (fd < 0) {
- sock_perror("socket");
- goto out;
- }
- #ifndef NMRPFLASH_WINDOWS
- #ifdef NMRPFLASH_LINUX
- if (add) {
- (*undo)->ip[0] = ipaddr;
- (*undo)->ip[1] = ipmask;
- }
- if (!intf_add_del_ip(sock->intf, (*undo)->ip[0], (*undo)->ip[1], add)) {
- goto out;
- }
- #else // NMRPFLASH_OSX (or any other BSD)
- struct ifaliasreq ifra;
- memset(&ifra, 0, sizeof(ifra));
- strncpy(ifra.ifra_name, sock->intf, IFNAMSIZ);
- set_addr(&ifra.ifra_addr, ipaddr);
- set_addr(&ifra.ifra_mask, ipmask);
- //set_addr(&ifra.ifra_broadaddr, (ipaddr & ipmask) | ~ipmask);
- if (ioctl(fd, add ? SIOCAIFADDR : SIOCDIFADDR, &ifra) != 0) {
- if (add) {
- xperror("ioctl(SIOCAIFADDR");
- }
- goto out;
- }
- if (add) {
- (*undo)->ip[0] = ipaddr;
- (*undo)->ip[1] = ipmask;
- intf_up(fd, ifra.ifra_name, true);
- }
- #endif
- #else // NMRPFLASH_WINDOWS
- struct sockaddr_in sin;
- ULONG instance;
- (*undo)->context = 0;
- DWORD err = AddIPAddress(ipaddr, ipmask, sock->index, &(*undo)->context, &instance);
- if (err != NO_ERROR && err != ERROR_DUP_DOMAINNAME && err != ERROR_OBJECT_ALREADY_EXISTS) {
- win_perror2("AddIPAddress", err);
- goto out;
- }
- set_addr(&sin, ipaddr);
- time_t beg = time_monotonic();
- /* Wait until the new IP has actually been added */
- while (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
- if ((time_monotonic() - beg) >= 5) {
- fprintf(stderr, "Failed to bind after 5 seconds: ");
- sock_perror("bind");
- DeleteIPAddress((*undo)->context);
- goto out;
- }
- }
- #endif
- ret = 0;
- out:
- #ifndef NMRPFLASH_WINDOWS
- close(fd);
- #else
- closesocket(fd);
- #endif
- if (ret != 0 && undo) {
- free(*undo);
- *undo = NULL;
- }
- return ret;
- }
- int ethsock_ip_add(struct ethsock *sock, uint32_t ipaddr, uint32_t ipmask, struct ethsock_ip_undo **undo)
- {
- return ethsock_ip_add_del(sock, ipaddr, ipmask, undo, true);
- }
- int ethsock_ip_del(struct ethsock *sock, struct ethsock_ip_undo **undo)
- {
- if (!*undo) {
- return 0;
- }
- int ret;
- #ifndef NMRPFLASH_WINDOWS
- if ((*undo)->ip[0] != INADDR_NONE) {
- ret = ethsock_ip_add_del(sock, (*undo)->ip[0], (*undo)->ip[1], undo, false);
- } else {
- ret = 0;
- }
- #else
- ret = DeleteIPAddress((*undo)->context) ? 0 : -1;
- #endif
- free(*undo);
- *undo = NULL;
- return ret;
- }
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