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>
42 #define NMRPFLASH_AF_PACKET AF_LINK
43 #include <net/if_types.h>
44 #include <net/if_media.h>
52 #ifndef NMRPFLASH_WINDOWS
54 #ifdef NMRPFLASH_LINUX
65 struct ethsock_arp_undo
71 struct ethsock_ip_undo
73 #ifndef NMRPFLASH_WINDOWS
80 const char *mac_to_str(uint8_t *mac)
83 snprintf(buf, sizeof(buf), "%02x:%02x:%02x:%02x:%02x:%02x",
84 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
88 static int x_pcap_findalldevs(pcap_if_t **devs)
90 char errbuf[PCAP_ERRBUF_SIZE];
91 if (pcap_findalldevs(devs, errbuf) != 0) {
92 fprintf(stderr, "%s.\n", errbuf);
99 #ifndef NMRPFLASH_WINDOWS
100 static inline bool sockaddr_get_hwaddr(struct sockaddr *sa, uint8_t *hwaddr)
104 if (sa->sa_family != NMRPFLASH_AF_PACKET) {
108 #ifndef NMRPFLASH_LINUX
109 if (((struct sockaddr_dl*)sa)->sdl_type != IFT_ETHER) {
112 src = LLADDR((struct sockaddr_dl*)sa);
114 src = ((struct sockaddr_ll*)sa)->sll_addr;
117 memcpy(hwaddr, src, 6);
121 #ifdef NMRPFLASH_LINUX
122 static int open_stp_state(const char *intf)
125 snprintf(name, sizeof(name), "/sys/class/net/%s/bridge/stp_state", intf);
126 return open(name, O_RDWR, 0644);
129 static bool is_stp_enabled(const char *intf)
132 int fd = open_stp_state(intf);
137 if (read(fd, &c, 1) != 1) {
145 static bool set_stp_enabled(const char *intf, bool enabled)
148 const char *s = enabled ? "1\n" : "0\n";
149 int fd = open_stp_state(intf);
154 ret = (write(fd, s, 2) == 2);
161 static bool get_intf_info(const char *intf, uint8_t *hwaddr, bool *bridge)
163 struct ifaddrs *ifas, *ifa;
166 if (getifaddrs(&ifas) != 0) {
167 xperror("getifaddrs");
177 for (ifa = ifas; ifa; ifa = ifa->ifa_next) {
178 if (!strcmp(ifa->ifa_name, intf)) {
179 if (sockaddr_get_hwaddr(ifa->ifa_addr, hwaddr)) {
182 *bridge = ((struct if_data*) ifa->ifa_data)->ifi_type == IFT_BRIDGE;
197 void win_perror2(const char *msg, DWORD err)
200 FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
201 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
202 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
203 (LPTSTR)&buf, 0, NULL);
206 /* FormatMessageA terminates buf with CRLF! */
207 fprintf(stderr, "%s: %s", msg, buf);
210 fprintf(stderr, "%s: error %d\n", msg, (int)err);
214 static bool get_intf_info(const char *intf, uint8_t *hwaddr, DWORD *index)
216 PIP_ADAPTER_INFO adapters, adapter;
221 if ((ret = GetAdaptersInfo(NULL, &bufLen)) != ERROR_BUFFER_OVERFLOW) {
222 win_perror2("GetAdaptersInfo", ret);
226 adapters = malloc(bufLen);
232 if ((ret = GetAdaptersInfo(adapters, &bufLen) == NO_ERROR)) {
233 for (adapter = adapters; adapter; adapter = adapter->Next) {
234 if (adapter->Type != MIB_IF_TYPE_ETHERNET && adapter->Type != IF_TYPE_IEEE80211) {
238 /* Interface names from WinPcap are "\Device\NPF_{GUID}", while
239 * AdapterName from GetAdaptersInfo is just "{GUID}".*/
240 if (strstr(intf, adapter->AdapterName)) {
241 if (adapter->AddressLength == 6) {
242 memcpy(hwaddr, adapter->Address, 6);
244 *index = adapter->Index;
252 win_perror2("GetAdaptersInfo", ret);
259 static const char *intf_alias_to_wpcap(const char *intf)
261 static char buf[128];
262 pcap_if_t *devs, *dev;
263 unsigned i = 0, dev_num = 0;
265 if (intf[0] == '\\') {
267 } else if (sscanf(intf, NMRPFLASH_NETALIAS_PREFIX "%u", &dev_num) != 1) {
268 fprintf(stderr, "Invalid interface alias.\n");
272 if (x_pcap_findalldevs(&devs) != 0) {
276 for (dev = devs; dev; dev = dev->next, ++i) {
279 printf("%s%u: %s\n", NMRPFLASH_NETALIAS_PREFIX, i, dev->name);
281 strncpy(buf, dev->name, sizeof(buf) - 1);
282 buf[sizeof(buf) - 1] = '\0';
287 pcap_freealldevs(devs);
290 fprintf(stderr, "Interface alias not found.\n");
297 static const char *intf_get_pretty_name(const char *intf)
299 static char buf[512];
305 guid = strstr(intf, "NPF_{");
312 snprintf(buf, sizeof(buf),
313 "System\\CurrentControlSet\\Control\\Network\\"
314 "{4D36E972-E325-11CE-BFC1-08002BE10318}\\"
315 "%s\\Connection", guid);
316 err = RegOpenKeyExA(HKEY_LOCAL_MACHINE, buf, 0, KEY_READ, &hkey);
317 if (err != ERROR_SUCCESS) {
319 win_perror2("RegOpenKeyExA", err);
325 err = RegQueryValueExA(hkey, "Name", NULL, NULL, (LPBYTE)buf, &len);
326 if (err == ERROR_SUCCESS) {
330 win_perror2("RegQueryValueExA", err);
340 inline uint8_t *ethsock_get_hwaddr(struct ethsock *sock)
345 struct ethsock *ethsock_create(const char *intf, uint16_t protocol)
347 char buf[PCAP_ERRBUF_SIZE];
348 struct bpf_program fp;
349 struct ethsock *sock;
353 #ifdef NMRPFLASH_WINDOWS
354 intf = intf_alias_to_wpcap(intf);
360 sock = malloc(sizeof(struct ethsock));
369 sock->pcap = pcap_open_live(sock->intf, BUFSIZ, 1, 1, buf);
371 fprintf(stderr, "%s.\n", buf);
376 fprintf(stderr, "Warning: %s.\n", buf);
379 if (pcap_datalink(sock->pcap) != DLT_EN10MB) {
380 fprintf(stderr, "%s is not an ethernet interface.\n",
385 #ifndef NMRPFLASH_WINDOWS
386 err = !get_intf_info(intf, sock->hwaddr, &is_bridge);
388 err = !get_intf_info(intf, sock->hwaddr, &sock->index);
391 fprintf(stderr, "Failed to get interface info.\n");
395 #ifndef NMRPFLASH_WINDOWS
396 sock->fd = pcap_get_selectable_fd(sock->pcap);
397 if (sock->fd == -1) {
398 pcap_perror(sock->pcap, "pcap_get_selectable_fd");
402 sock->handle = pcap_getevent(sock->pcap);
404 pcap_perror(sock->pcap, "pcap_getevent");
408 err = pcap_setmintocopy(sock->pcap, 1);
410 pcap_perror(sock->pcap, "pcap_setmintocopy");
415 snprintf(buf, sizeof(buf), "ether proto 0x%04x and not ether src %s",
416 protocol, mac_to_str(sock->hwaddr));
418 err = pcap_compile(sock->pcap, &fp, buf, 0, 0);
420 pcap_perror(sock->pcap, "pcap_compile");
424 err = pcap_setfilter(sock->pcap, &fp);
428 pcap_perror(sock->pcap, "pcap_setfilter");
432 #ifdef NMRPFLASH_LINUX
433 // nmrpflash does not work on bridge interfaces with STP enabled
434 if ((sock->stp = is_stp_enabled(intf))) {
435 if (!set_stp_enabled(intf, false)) {
436 fprintf(stderr, "Warning: failed to disable STP on %s.\n", intf);
441 fprintf(stderr, "Warning: bridge interfaces are not fully "
442 "supported on this platform.\n");
453 int select_fd(int fd, unsigned timeout)
462 tv.tv_sec = timeout / 1000;
463 tv.tv_usec = 1000 * (timeout % 1000);
465 status = select(fd + 1, &fds, NULL, NULL, &tv);
467 sock_perror("select");
473 ssize_t ethsock_recv(struct ethsock *sock, void *buf, size_t len)
475 struct pcap_pkthdr* hdr;
476 const u_char *capbuf;
478 #ifdef NMRPFLASH_WINDOWS
482 ret = WaitForSingleObject(sock->handle, sock->timeout);
483 if (ret == WAIT_TIMEOUT) {
485 } else if (ret != WAIT_OBJECT_0) {
486 win_perror2("WaitForSingleObject", ret);
492 status = select_fd(sock->fd, sock->timeout);
495 } else if (status == 0) {
501 status = pcap_next_ex(sock->pcap, &hdr, &capbuf);
504 memcpy(buf, capbuf, MIN(len, hdr->caplen));
509 pcap_perror(sock->pcap, "pcap_next_ex");
512 fprintf(stderr, "pcap_next_ex: returned %d.\n", status);
517 int ethsock_send(struct ethsock *sock, void *buf, size_t len)
519 #ifdef NMRPFLASH_WINDOWS
520 if (pcap_sendpacket(sock->pcap, buf, len) == 0) {
523 pcap_perror(sock->pcap, "pcap_sendpacket");
527 if (pcap_inject(sock->pcap, buf, len) == len) {
530 pcap_perror(sock->pcap, "pcap_inject");
536 int ethsock_close(struct ethsock *sock)
542 #ifdef NMRPFLASH_LINUX
544 set_stp_enabled(sock->intf, true);
548 pcap_close(sock->pcap);
555 inline int ethsock_set_timeout(struct ethsock *sock, unsigned msec)
557 sock->timeout = msec;
561 #ifndef NMRPFLASH_WINDOWS
562 int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
567 int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
572 static int ethsock_arp(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
576 .dwIndex = sock->index,
579 .dwType = MIB_IPNET_TYPE_STATIC
582 memcpy(arp.bPhysAddr, hwaddr, 6);
585 ret = CreateIpNetEntry(&arp);
586 if (ret != NO_ERROR) {
587 win_perror2("CreateIpNetEntry", ret);
591 *undo = malloc(sizeof(struct ethsock_arp_undo));
597 (*undo)->ipaddr = ipaddr;
598 memcpy((*undo)->hwaddr, hwaddr, 6);
600 DeleteIpNetEntry(&arp);
606 int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
608 ethsock_arp(sock, hwaddr, ipaddr, NULL);
609 return undo ? ethsock_arp(sock, hwaddr, ipaddr, undo) : -1;
612 int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
618 int ret = ethsock_arp(sock, (*undo)->hwaddr, (*undo)->ipaddr, NULL);
625 static bool get_hwaddr_from_pcap(const pcap_if_t *dev, uint8_t *hwaddr)
627 #ifndef NMRPFLASH_WINDOWS
631 for (addr = dev->addresses; addr; addr = addr->next) {
633 printf("%s: sa_family=%d, sa_data={ ", dev->name,
634 addr->addr->sa_family);
635 for (i = 0; i != sizeof(addr->addr->sa_data); ++i) {
636 printf("%02x ", addr->addr->sa_data[i] & 0xff);
641 if (sockaddr_get_hwaddr(addr->addr, hwaddr)) {
647 return get_intf_info(dev->name, hwaddr, NULL);
650 int ethsock_list_all(void)
652 pcap_if_t *devs, *dev;
655 unsigned dev_num = 0, dev_ok = 0;
656 #ifdef NMRPFLASH_WINDOWS
660 if (x_pcap_findalldevs(&devs) != 0) {
664 memset(hwaddr, 0, 6);
666 for (dev = devs; dev; dev = dev->next, ++dev_num) {
667 if (dev->flags & PCAP_IF_LOOPBACK) {
669 printf("%-15s (loopback device)\n", dev->name);
674 if (!get_hwaddr_from_pcap(dev, hwaddr)) {
676 printf("%-15s (not an ethernet device)\n",
682 #ifndef NMRPFLASH_WINDOWS
683 printf("%-15s", dev->name);
685 /* Call this here so *_perror() calls don't happen within a line */
686 pretty = intf_get_pretty_name(dev->name);
689 printf("%s%u", NMRPFLASH_NETALIAS_PREFIX, dev_num);
691 printf("%s", dev->name);
695 for (addr = dev->addresses; addr; addr = addr->next) {
696 if (addr->addr->sa_family == AF_INET) {
698 inet_ntoa(((struct sockaddr_in*)addr->addr)->sin_addr));
704 printf(" %-15s", "0.0.0.0");
707 printf(" %s", mac_to_str(hwaddr));
709 #ifdef NMRPFLASH_WINDOWS
711 printf(" (%s)", pretty);
712 } else if (dev->description) {
713 printf(" (%s)", dev->description);
722 printf("No suitable network interfaces found.\n");
728 int ethsock_for_each_ip(struct ethsock *sock, ethsock_ip_callback_t callback,
731 struct ethsock_ip_callback_args args;
732 pcap_if_t *devs, *dev;
736 if (x_pcap_findalldevs(&devs) != 0) {
742 for (dev = devs; dev; dev = dev->next) {
743 if (strcmp(sock->intf, dev->name)) {
747 for (addr = dev->addresses; addr; addr = addr->next) {
748 if (addr->addr->sa_family == AF_INET) {
749 args.ipaddr = &((struct sockaddr_in*)addr->addr)->sin_addr;
750 args.ipmask = &((struct sockaddr_in*)addr->netmask)->sin_addr;
752 status = callback(&args);
762 pcap_freealldevs(devs);
764 return status <= 0 ? status : 0;
767 static inline void set_addr(void *p, uint32_t addr)
769 struct sockaddr_in* sin = p;
770 sin->sin_family = AF_INET;
771 sin->sin_addr.s_addr = addr;
773 ((struct sockaddr*)p)->sa_len = sizeof(struct sockaddr_in);
777 #ifndef NMRPFLASH_WINDOWS
778 static bool set_interface_up(int fd, const char *intf, bool up)
781 strncpy(ifr.ifr_name, intf, IFNAMSIZ);
783 if (ioctl(fd, SIOCGIFFLAGS, &ifr) != 0) {
785 xperror("ioctl(SIOCGIFFLAGS)");
791 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
793 ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
796 if (ioctl(fd, SIOCSIFFLAGS, &ifr) != 0) {
798 xperror("ioctl(SIOCSIFFLAGS)");
808 int ethsock_ip_add(struct ethsock *sock, uint32_t ipaddr, uint32_t ipmask, struct ethsock_ip_undo **undo)
810 if (undo && !(*undo = malloc(sizeof(struct ethsock_ip_undo)))) {
816 int fd = socket(AF_INET, SOCK_DGRAM, 0);
818 sock_perror("socket");
822 #ifndef NMRPFLASH_WINDOWS
823 // XXX: undo is non-zero only if we're adding an IP
825 #ifdef NMRPFLASH_LINUX
827 strncpy(ifr.ifr_name, sock->intf, IFNAMSIZ);
828 // FIXME: automatically determine the next free alias
829 strcat(ifr.ifr_name, ":42");
832 set_addr(&ifr.ifr_addr, ipaddr);
833 if (ioctl(fd, SIOCSIFADDR, &ifr) != 0) {
834 xperror("ioctl(SIOSIFADDR)");
838 set_addr(&ifr.ifr_netmask, ipmask);
839 if (ioctl(fd, SIOCSIFNETMASK, &ifr) != 0) {
840 xperror("ioctl(SIOCSIFNETMASK)");
844 (*undo)->ip[0] = ipaddr;
845 (*undo)->ip[1] = ipmask;
848 if (!set_interface_up(fd, ifr.ifr_name, add)) {
851 #else // NMRPFLASH_OSX (or any other BSD)
852 struct ifaliasreq ifra;
853 memset(&ifra, 0, sizeof(ifra));
854 strncpy(ifra.ifra_name, sock->intf, IFNAMSIZ);
856 set_addr(&ifra.ifra_addr, ipaddr);
857 set_addr(&ifra.ifra_mask, ipmask);
858 //set_addr(&ifra.ifra_broadaddr, (ipaddr & ipmask) | ~ipmask);
860 if (ioctl(fd, add ? SIOCAIFADDR : SIOCDIFADDR, &ifra) != 0) {
862 xperror("ioctl(SIOCAIFADDR");
868 (*undo)->ip[0] = ipaddr;
869 (*undo)->ip[1] = ipmask;
870 set_interface_up(fd, ifra.ifra_name, true);
874 #else // NMRPFLASH_WINDOWS
875 struct sockaddr_in sin;
878 (*undo)->context = 0;
880 DWORD err = AddIPAddress(ipaddr, ipmask, sock->index, &(*undo)->context, &instance);
881 if (err != NO_ERROR && err != ERROR_DUP_DOMAINNAME && err != ERROR_OBJECT_ALREADY_EXISTS) {
882 win_perror2("AddIPAddress", err);
886 set_addr(&sin, ipaddr);
887 time_t beg = time_monotonic();
889 /* Wait until the new IP has actually been added */
891 while (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
892 if ((time_monotonic() - beg) >= 5) {
893 fprintf(stderr, "Failed to bind after 5 seconds: ");
895 DeleteIPAddress((*undo)->context);
903 #ifndef NMRPFLASH_WINDOWS
908 if (ret != 0 && undo) {
916 int ethsock_ip_del(struct ethsock *sock, struct ethsock_ip_undo **undo)
924 #ifndef NMRPFLASH_WINDOWS
925 if ((*undo)->ip[0] != INADDR_NONE) {
926 ret = ethsock_ip_add(sock, (*undo)->ip[0], (*undo)->ip[1], NULL);
931 DeleteIPAddress((*undo)->context);