2 * nmrpflash - Netgear Unbrick Utility
3 * Copyright (C) 2016 Joseph Lehner <joseph.c.lehner@gmail.com>
5 * nmrpflash is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * nmrpflash is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with nmrpflash. If not, see <http://www.gnu.org/licenses/>.
20 #include <sys/types.h>
28 #if defined(NMRPFLASH_WINDOWS)
29 #define NMRPFLASH_NETALIAS_PREFIX "net"
33 #include <sys/ioctl.h>
38 #if defined(NMRPFLASH_LINUX)
39 #define NMRPFLASH_AF_PACKET AF_PACKET
40 #include <linux/if_packet.h>
41 #include <netlink/route/addr.h>
43 #define NMRPFLASH_AF_PACKET AF_LINK
44 #include <net/if_types.h>
45 #include <net/if_media.h>
53 #ifndef NMRPFLASH_WINDOWS
55 #ifdef NMRPFLASH_LINUX
66 struct ethsock_arp_undo
72 struct ethsock_ip_undo
74 #ifndef NMRPFLASH_WINDOWS
81 const char *mac_to_str(uint8_t *mac)
84 snprintf(buf, sizeof(buf), "%02x:%02x:%02x:%02x:%02x:%02x",
85 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
89 static int x_pcap_findalldevs(pcap_if_t **devs)
91 char errbuf[PCAP_ERRBUF_SIZE];
92 if (pcap_findalldevs(devs, errbuf) != 0) {
93 fprintf(stderr, "%s.\n", errbuf);
100 #ifndef NMRPFLASH_WINDOWS
101 static inline bool sockaddr_get_hwaddr(struct sockaddr *sa, uint8_t *hwaddr)
105 if (sa->sa_family != NMRPFLASH_AF_PACKET) {
109 #ifndef NMRPFLASH_LINUX
110 if (((struct sockaddr_dl*)sa)->sdl_type != IFT_ETHER) {
113 src = LLADDR((struct sockaddr_dl*)sa);
115 src = ((struct sockaddr_ll*)sa)->sll_addr;
118 memcpy(hwaddr, src, 6);
122 #ifdef NMRPFLASH_LINUX
123 static int bridge_stp_state(const char *intf)
126 snprintf(name, sizeof(name), "/sys/class/net/%s/bridge/stp_state", intf);
127 return open(name, O_RDWR, 0644);
130 static bool bridge_stp_enabled(const char *intf)
133 int fd = bridge_stp_state(intf);
138 if (read(fd, &c, 1) != 1) {
146 static bool bridge_stp(const char *intf, bool enabled)
149 const char *s = enabled ? "1\n" : "0\n";
150 int fd = bridge_stp_state(intf);
155 ret = (write(fd, s, 2) == 2);
161 static bool xrtnl_addr_set(struct rtnl_addr *ra, uint32_t addr, int (*cb)(struct rtnl_addr*, struct nl_addr*))
163 struct nl_addr *na = nl_addr_build(AF_INET, &addr, 4);
165 xperror("nl_addr_build");
175 static bool intf_add_del_ip(const char *intf, uint32_t ipaddr, uint32_t ipmask, bool add)
177 struct rtnl_addr *ra = NULL;
178 struct nl_addr *na = NULL;
179 struct nl_sock *sk = NULL;
182 if (!(sk = nl_socket_alloc())) {
183 xperror("nl_socket_alloc");
187 if ((err = nl_connect(sk, NETLINK_ROUTE)) < 0) {
188 fprintf(stderr, "nl_connect: %s\n", nl_geterror(err));
192 if (!(ra = rtnl_addr_alloc())) {
193 xperror("rtnl_addr_alloc");
197 if (!xrtnl_addr_set(ra, (ipaddr & ipmask) | ~ipmask, &rtnl_addr_set_broadcast)
198 || !xrtnl_addr_set(ra, ipaddr, &rtnl_addr_set_local)) {
202 rtnl_addr_set_ifindex(ra, if_nametoindex(intf));
203 rtnl_addr_set_prefixlen(ra, bitcount(ipmask));
205 if ((err = add ? rtnl_addr_add(sk, ra, 0) : rtnl_addr_delete(sk, ra, 0)) < 0) {
206 fprintf(stderr, "%s: %s\n", add ? "rtnl_addr_add" : "rtnl_addr_delete", nl_geterror(err));
218 static bool intf_get_info(const char *intf, uint8_t *hwaddr, bool *bridge)
220 struct ifaddrs *ifas, *ifa;
223 if (getifaddrs(&ifas) != 0) {
224 xperror("getifaddrs");
234 for (ifa = ifas; ifa; ifa = ifa->ifa_next) {
235 if (!strcmp(ifa->ifa_name, intf)) {
236 if (sockaddr_get_hwaddr(ifa->ifa_addr, hwaddr)) {
239 *bridge = ((struct if_data*) ifa->ifa_data)->ifi_type == IFT_BRIDGE;
254 void win_perror2(const char *msg, DWORD err)
257 FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
258 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
259 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
260 (LPTSTR)&buf, 0, NULL);
263 /* FormatMessageA terminates buf with CRLF! */
264 fprintf(stderr, "%s: %s", msg, buf);
267 fprintf(stderr, "%s: error %d\n", msg, (int)err);
271 static bool intf_get_info(const char *intf, uint8_t *hwaddr, DWORD *index)
273 PIP_ADAPTER_INFO adapters, adapter;
278 if ((ret = GetAdaptersInfo(NULL, &bufLen)) != ERROR_BUFFER_OVERFLOW) {
279 win_perror2("GetAdaptersInfo", ret);
283 adapters = malloc(bufLen);
289 if ((ret = GetAdaptersInfo(adapters, &bufLen) == NO_ERROR)) {
290 for (adapter = adapters; adapter; adapter = adapter->Next) {
291 if (adapter->Type != MIB_IF_TYPE_ETHERNET && adapter->Type != IF_TYPE_IEEE80211) {
295 /* Interface names from WinPcap are "\Device\NPF_{GUID}", while
296 * AdapterName from GetAdaptersInfo is just "{GUID}".*/
297 if (strstr(intf, adapter->AdapterName)) {
298 if (adapter->AddressLength == 6) {
299 memcpy(hwaddr, adapter->Address, 6);
301 *index = adapter->Index;
309 win_perror2("GetAdaptersInfo", ret);
316 static const char *intf_alias_to_wpcap(const char *intf)
318 static char buf[128];
319 pcap_if_t *devs, *dev;
320 unsigned i = 0, dev_num = 0;
322 if (intf[0] == '\\') {
324 } else if (sscanf(intf, NMRPFLASH_NETALIAS_PREFIX "%u", &dev_num) != 1) {
325 fprintf(stderr, "Invalid interface alias.\n");
329 if (x_pcap_findalldevs(&devs) != 0) {
333 for (dev = devs; dev; dev = dev->next, ++i) {
336 printf("%s%u: %s\n", NMRPFLASH_NETALIAS_PREFIX, i, dev->name);
338 strncpy(buf, dev->name, sizeof(buf) - 1);
339 buf[sizeof(buf) - 1] = '\0';
344 pcap_freealldevs(devs);
347 fprintf(stderr, "Interface alias not found.\n");
354 static const char *intf_get_pretty_name(const char *intf)
356 static char buf[512];
362 guid = strstr(intf, "NPF_{");
369 snprintf(buf, sizeof(buf),
370 "System\\CurrentControlSet\\Control\\Network\\"
371 "{4D36E972-E325-11CE-BFC1-08002BE10318}\\"
372 "%s\\Connection", guid);
373 err = RegOpenKeyExA(HKEY_LOCAL_MACHINE, buf, 0, KEY_READ, &hkey);
374 if (err != ERROR_SUCCESS) {
376 win_perror2("RegOpenKeyExA", err);
382 err = RegQueryValueExA(hkey, "Name", NULL, NULL, (LPBYTE)buf, &len);
383 if (err == ERROR_SUCCESS) {
387 win_perror2("RegQueryValueExA", err);
397 inline uint8_t *ethsock_get_hwaddr(struct ethsock *sock)
402 struct ethsock *ethsock_create(const char *intf, uint16_t protocol)
404 char buf[PCAP_ERRBUF_SIZE];
405 struct bpf_program bpf;
406 struct ethsock *sock;
410 #ifdef NMRPFLASH_WINDOWS
411 intf = intf_alias_to_wpcap(intf);
417 sock = malloc(sizeof(struct ethsock));
426 sock->pcap = pcap_open_live(sock->intf, BUFSIZ, 1, 1, buf);
428 fprintf(stderr, "%s.\n", buf);
433 fprintf(stderr, "Warning: %s.\n", buf);
436 if (pcap_datalink(sock->pcap) != DLT_EN10MB) {
437 fprintf(stderr, "%s is not an ethernet interface.\n",
442 #ifndef NMRPFLASH_WINDOWS
443 err = !intf_get_info(intf, sock->hwaddr, &is_bridge);
445 err = !intf_get_info(intf, sock->hwaddr, &sock->index);
448 fprintf(stderr, "Failed to get interface info.\n");
452 #ifndef NMRPFLASH_WINDOWS
453 sock->fd = pcap_get_selectable_fd(sock->pcap);
454 if (sock->fd == -1) {
455 pcap_perror(sock->pcap, "pcap_get_selectable_fd");
459 sock->handle = pcap_getevent(sock->pcap);
461 pcap_perror(sock->pcap, "pcap_getevent");
465 err = pcap_setmintocopy(sock->pcap, 1);
467 pcap_perror(sock->pcap, "pcap_setmintocopy");
472 err = pcap_setdirection(sock->pcap, PCAP_D_IN);
474 pcap_perror(sock->pcap, "pcap_setdirection");
478 snprintf(buf, sizeof(buf), "ether proto 0x%04x", protocol);
480 err = pcap_compile(sock->pcap, &bpf, buf, 0, 0);
482 pcap_perror(sock->pcap, "pcap_compile");
486 err = pcap_setfilter(sock->pcap, &bpf);
490 pcap_perror(sock->pcap, "pcap_setfilter");
494 #ifdef NMRPFLASH_LINUX
495 // nmrpflash does not work on bridge interfaces with STP enabled
496 if ((sock->stp = bridge_stp_enabled(intf))) {
497 if (!bridge_stp(intf, false)) {
498 fprintf(stderr, "Warning: failed to disable STP on %s.\n", intf);
503 fprintf(stderr, "Warning: bridge interfaces are not fully "
504 "supported on this platform.\n");
515 int select_fd(int fd, unsigned timeout)
524 tv.tv_sec = timeout / 1000;
525 tv.tv_usec = 1000 * (timeout % 1000);
527 status = select(fd + 1, &fds, NULL, NULL, &tv);
529 sock_perror("select");
535 ssize_t ethsock_recv(struct ethsock *sock, void *buf, size_t len)
537 struct pcap_pkthdr* hdr;
538 const u_char *capbuf;
540 #ifdef NMRPFLASH_WINDOWS
544 ret = WaitForSingleObject(sock->handle, sock->timeout);
545 if (ret == WAIT_TIMEOUT) {
547 } else if (ret != WAIT_OBJECT_0) {
548 win_perror2("WaitForSingleObject", ret);
554 status = select_fd(sock->fd, sock->timeout);
557 } else if (status == 0) {
563 status = pcap_next_ex(sock->pcap, &hdr, &capbuf);
566 memcpy(buf, capbuf, MIN(len, hdr->caplen));
571 pcap_perror(sock->pcap, "pcap_next_ex");
574 fprintf(stderr, "pcap_next_ex: returned %d.\n", status);
579 int ethsock_send(struct ethsock *sock, void *buf, size_t len)
581 #ifdef NMRPFLASH_WINDOWS
582 if (pcap_sendpacket(sock->pcap, buf, len) == 0) {
585 pcap_perror(sock->pcap, "pcap_sendpacket");
589 if (pcap_inject(sock->pcap, buf, len) == len) {
592 pcap_perror(sock->pcap, "pcap_inject");
598 int ethsock_close(struct ethsock *sock)
604 #ifdef NMRPFLASH_LINUX
606 bridge_stp(sock->intf, true);
610 pcap_close(sock->pcap);
617 inline int ethsock_set_timeout(struct ethsock *sock, unsigned msec)
619 sock->timeout = msec;
623 #ifndef NMRPFLASH_WINDOWS
624 int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
629 int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
634 static int ethsock_arp(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
638 .dwIndex = sock->index,
641 .dwType = MIB_IPNET_TYPE_STATIC
644 memcpy(arp.bPhysAddr, hwaddr, 6);
647 ret = CreateIpNetEntry(&arp);
648 if (ret != NO_ERROR) {
649 win_perror2("CreateIpNetEntry", ret);
653 *undo = malloc(sizeof(struct ethsock_arp_undo));
659 (*undo)->ipaddr = ipaddr;
660 memcpy((*undo)->hwaddr, hwaddr, 6);
662 DeleteIpNetEntry(&arp);
668 int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
670 ethsock_arp(sock, hwaddr, ipaddr, NULL);
671 return undo ? ethsock_arp(sock, hwaddr, ipaddr, undo) : -1;
674 int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
680 int ret = ethsock_arp(sock, (*undo)->hwaddr, (*undo)->ipaddr, NULL);
687 static bool get_hwaddr_from_pcap(const pcap_if_t *dev, uint8_t *hwaddr)
689 #ifndef NMRPFLASH_WINDOWS
693 for (addr = dev->addresses; addr; addr = addr->next) {
695 printf("%s: sa_family=%d, sa_data={ ", dev->name,
696 addr->addr->sa_family);
697 for (i = 0; i != sizeof(addr->addr->sa_data); ++i) {
698 printf("%02x ", addr->addr->sa_data[i] & 0xff);
703 if (sockaddr_get_hwaddr(addr->addr, hwaddr)) {
709 return intf_get_info(dev->name, hwaddr, NULL);
712 int ethsock_list_all(void)
714 pcap_if_t *devs, *dev;
717 unsigned dev_num = 0, dev_ok = 0;
718 #ifdef NMRPFLASH_WINDOWS
722 if (x_pcap_findalldevs(&devs) != 0) {
726 memset(hwaddr, 0, 6);
728 for (dev = devs; dev; dev = dev->next, ++dev_num) {
729 if (dev->flags & PCAP_IF_LOOPBACK) {
731 printf("%-15s (loopback device)\n", dev->name);
736 if (!get_hwaddr_from_pcap(dev, hwaddr)) {
738 printf("%-15s (not an ethernet device)\n",
744 #ifndef NMRPFLASH_WINDOWS
745 printf("%-15s", dev->name);
747 /* Call this here so *_perror() calls don't happen within a line */
748 pretty = intf_get_pretty_name(dev->name);
751 printf("%s%-2u", NMRPFLASH_NETALIAS_PREFIX, dev_num);
753 printf("%s", dev->name);
757 for (addr = dev->addresses; addr; addr = addr->next) {
758 if (addr->addr->sa_family == AF_INET) {
760 inet_ntoa(((struct sockaddr_in*)addr->addr)->sin_addr));
766 printf(" %-15s", "0.0.0.0");
769 printf(" %s", mac_to_str(hwaddr));
771 #ifdef NMRPFLASH_WINDOWS
773 printf(" (%s)", pretty);
774 } else if (dev->description) {
775 printf(" (%s)", dev->description);
784 printf("No suitable network interfaces found.\n");
790 int ethsock_for_each_ip(struct ethsock *sock, ethsock_ip_callback_t callback,
793 struct ethsock_ip_callback_args args;
794 pcap_if_t *devs, *dev;
798 if (x_pcap_findalldevs(&devs) != 0) {
804 for (dev = devs; dev; dev = dev->next) {
805 if (strcmp(sock->intf, dev->name)) {
809 for (addr = dev->addresses; addr; addr = addr->next) {
810 if (addr->addr->sa_family == AF_INET) {
811 args.ipaddr = &((struct sockaddr_in*)addr->addr)->sin_addr;
812 args.ipmask = &((struct sockaddr_in*)addr->netmask)->sin_addr;
814 status = callback(&args);
824 pcap_freealldevs(devs);
826 return status <= 0 ? status : 0;
829 static inline void set_addr(void *p, uint32_t addr)
831 struct sockaddr_in* sin = p;
832 sin->sin_family = AF_INET;
833 sin->sin_addr.s_addr = addr;
835 ((struct sockaddr*)p)->sa_len = sizeof(struct sockaddr_in);
839 #if !defined(NMRPFLASH_WINDOWS) && !defined(NMRPFLASH_LINUX)
840 static bool intf_up(int fd, const char *intf, bool up)
843 strncpy(ifr.ifr_name, intf, IFNAMSIZ);
845 if (ioctl(fd, SIOCGIFFLAGS, &ifr) != 0) {
847 xperror("ioctl(SIOCGIFFLAGS)");
853 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
855 ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
858 if (ioctl(fd, SIOCSIFFLAGS, &ifr) != 0) {
860 xperror("ioctl(SIOCSIFFLAGS)");
869 static int ethsock_ip_add_del(struct ethsock *sock, uint32_t ipaddr, uint32_t ipmask, struct ethsock_ip_undo **undo, bool add)
874 if (!(*undo = malloc(sizeof(struct ethsock_ip_undo)))) {
879 memset(*undo, 0, sizeof(**undo));
883 fd = socket(AF_INET, SOCK_DGRAM, 0);
885 sock_perror("socket");
889 #ifndef NMRPFLASH_WINDOWS
890 #ifdef NMRPFLASH_LINUX
892 (*undo)->ip[0] = ipaddr;
893 (*undo)->ip[1] = ipmask;
896 if (!intf_add_del_ip(sock->intf, (*undo)->ip[0], (*undo)->ip[1], add)) {
899 #else // NMRPFLASH_OSX (or any other BSD)
900 struct ifaliasreq ifra;
901 memset(&ifra, 0, sizeof(ifra));
902 strncpy(ifra.ifra_name, sock->intf, IFNAMSIZ);
904 set_addr(&ifra.ifra_addr, ipaddr);
905 set_addr(&ifra.ifra_mask, ipmask);
906 //set_addr(&ifra.ifra_broadaddr, (ipaddr & ipmask) | ~ipmask);
908 if (ioctl(fd, add ? SIOCAIFADDR : SIOCDIFADDR, &ifra) != 0) {
910 xperror("ioctl(SIOCAIFADDR");
916 (*undo)->ip[0] = ipaddr;
917 (*undo)->ip[1] = ipmask;
918 intf_up(fd, ifra.ifra_name, true);
922 #else // NMRPFLASH_WINDOWS
923 struct sockaddr_in sin;
926 (*undo)->context = 0;
928 DWORD err = AddIPAddress(ipaddr, ipmask, sock->index, &(*undo)->context, &instance);
929 if (err != NO_ERROR && err != ERROR_DUP_DOMAINNAME && err != ERROR_OBJECT_ALREADY_EXISTS) {
930 win_perror2("AddIPAddress", err);
934 set_addr(&sin, ipaddr);
935 time_t beg = time_monotonic();
937 /* Wait until the new IP has actually been added */
939 while (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
940 if ((time_monotonic() - beg) >= 5) {
941 fprintf(stderr, "Failed to bind after 5 seconds: ");
943 DeleteIPAddress((*undo)->context);
951 #ifndef NMRPFLASH_WINDOWS
956 if (ret != 0 && undo) {
964 int ethsock_ip_add(struct ethsock *sock, uint32_t ipaddr, uint32_t ipmask, struct ethsock_ip_undo **undo)
966 return ethsock_ip_add_del(sock, ipaddr, ipmask, undo, true);
969 int ethsock_ip_del(struct ethsock *sock, struct ethsock_ip_undo **undo)
977 #ifndef NMRPFLASH_WINDOWS
978 if ((*undo)->ip[0] != INADDR_NONE) {
979 ret = ethsock_ip_add_del(sock, (*undo)->ip[0], (*undo)->ip[1], undo, false);
984 DeleteIPAddress((*undo)->context);