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");
178 for (ifa = ifas; ifa; ifa = ifa->ifa_next) {
179 if (!strcmp(ifa->ifa_name, intf)) {
180 if (sockaddr_get_hwaddr(ifa->ifa_addr, hwaddr)) {
183 *bridge = ((struct if_data*) ifa->ifa_data)->ifi_type == IFT_BRIDGE;
198 void win_perror2(const char *msg, DWORD err)
201 FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
202 FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
203 NULL, err, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
204 (LPTSTR)&buf, 0, NULL);
207 /* FormatMessageA terminates buf with CRLF! */
208 fprintf(stderr, "%s: %s", msg, buf);
211 fprintf(stderr, "%s: error %d\n", msg, (int)err);
215 static bool get_intf_info(const char *intf, uint8_t *hwaddr, DWORD *index)
217 PIP_ADAPTER_INFO adapters, adapter;
222 if ((ret = GetAdaptersInfo(NULL, &bufLen)) != ERROR_BUFFER_OVERFLOW) {
223 win_perror2("GetAdaptersInfo", ret);
227 adapters = malloc(bufLen);
233 if ((ret = GetAdaptersInfo(adapters, &bufLen) == NO_ERROR)) {
234 for (adapter = adapters; adapter; adapter = adapter->Next) {
235 if (adapter->Type != MIB_IF_TYPE_ETHERNET && adapter->Type != IF_TYPE_IEEE80211) {
239 /* Interface names from WinPcap are "\Device\NPF_{GUID}", while
240 * AdapterName from GetAdaptersInfo is just "{GUID}".*/
241 if (strstr(intf, adapter->AdapterName)) {
242 if (adapter->AddressLength == 6) {
243 memcpy(hwaddr, adapter->Address, 6);
245 *index = adapter->Index;
253 win_perror2("GetAdaptersInfo", ret);
260 static const char *intf_alias_to_wpcap(const char *intf)
262 static char buf[128];
263 pcap_if_t *devs, *dev;
264 unsigned i = 0, dev_num = 0;
266 if (intf[0] == '\\') {
268 } else if (sscanf(intf, NMRPFLASH_NETALIAS_PREFIX "%u", &dev_num) != 1) {
269 fprintf(stderr, "Invalid interface alias.\n");
273 if (x_pcap_findalldevs(&devs) != 0) {
277 for (dev = devs; dev; dev = dev->next, ++i) {
280 printf("%s%u: %s\n", NMRPFLASH_NETALIAS_PREFIX, i, dev->name);
282 strncpy(buf, dev->name, sizeof(buf) - 1);
283 buf[sizeof(buf) - 1] = '\0';
288 pcap_freealldevs(devs);
291 fprintf(stderr, "Interface alias not found.\n");
298 static const char *intf_get_pretty_name(const char *intf)
300 static char buf[512];
306 guid = strstr(intf, "NPF_{");
313 snprintf(buf, sizeof(buf),
314 "System\\CurrentControlSet\\Control\\Network\\"
315 "{4D36E972-E325-11CE-BFC1-08002BE10318}\\"
316 "%s\\Connection", guid);
317 err = RegOpenKeyExA(HKEY_LOCAL_MACHINE, buf, 0, KEY_READ, &hkey);
318 if (err != ERROR_SUCCESS) {
320 win_perror2("RegOpenKeyExA", err);
326 err = RegQueryValueExA(hkey, "Name", NULL, NULL, (LPBYTE)buf, &len);
327 if (err == ERROR_SUCCESS) {
331 win_perror2("RegQueryValueExA", err);
341 inline uint8_t *ethsock_get_hwaddr(struct ethsock *sock)
346 struct ethsock *ethsock_create(const char *intf, uint16_t protocol)
348 char buf[PCAP_ERRBUF_SIZE];
349 struct bpf_program fp;
350 struct ethsock *sock;
354 #ifdef NMRPFLASH_WINDOWS
355 intf = intf_alias_to_wpcap(intf);
361 sock = malloc(sizeof(struct ethsock));
370 sock->pcap = pcap_open_live(sock->intf, BUFSIZ, 1, 1, buf);
372 fprintf(stderr, "%s.\n", buf);
377 fprintf(stderr, "Warning: %s.\n", buf);
380 if (pcap_datalink(sock->pcap) != DLT_EN10MB) {
381 fprintf(stderr, "%s is not an ethernet interface.\n",
386 #ifndef NMRPFLASH_WINDOWS
387 err = !get_intf_info(intf, sock->hwaddr, &is_bridge);
389 err = !get_intf_info(intf, sock->hwaddr, &sock->index);
392 fprintf(stderr, "Failed to get interface info.\n");
396 #ifndef NMRPFLASH_WINDOWS
397 sock->fd = pcap_get_selectable_fd(sock->pcap);
398 if (sock->fd == -1) {
399 pcap_perror(sock->pcap, "pcap_get_selectable_fd");
403 sock->handle = pcap_getevent(sock->pcap);
405 pcap_perror(sock->pcap, "pcap_getevent");
409 err = pcap_setmintocopy(sock->pcap, 1);
411 pcap_perror(sock->pcap, "pcap_setmintocopy");
416 snprintf(buf, sizeof(buf), "ether proto 0x%04x and not ether src %s",
417 protocol, mac_to_str(sock->hwaddr));
419 err = pcap_compile(sock->pcap, &fp, buf, 0, 0);
421 pcap_perror(sock->pcap, "pcap_compile");
425 err = pcap_setfilter(sock->pcap, &fp);
429 pcap_perror(sock->pcap, "pcap_setfilter");
433 #ifdef NMRPFLASH_LINUX
434 // nmrpflash does not work on bridge interfaces with STP enabled
435 if ((sock->stp = is_stp_enabled(intf))) {
436 if (!set_stp_enabled(intf, false)) {
437 fprintf(stderr, "Warning: failed to disable STP on %s.\n", intf);
442 fprintf(stderr, "Warning: bridge interfaces are not fully "
443 "supported on this platform.\n");
454 int select_fd(int fd, unsigned timeout)
463 tv.tv_sec = timeout / 1000;
464 tv.tv_usec = 1000 * (timeout % 1000);
466 status = select(fd + 1, &fds, NULL, NULL, &tv);
468 sock_perror("select");
474 ssize_t ethsock_recv(struct ethsock *sock, void *buf, size_t len)
476 struct pcap_pkthdr* hdr;
477 const u_char *capbuf;
479 #ifdef NMRPFLASH_WINDOWS
483 ret = WaitForSingleObject(sock->handle, sock->timeout);
484 if (ret == WAIT_TIMEOUT) {
486 } else if (ret != WAIT_OBJECT_0) {
487 win_perror2("WaitForSingleObject", ret);
493 status = select_fd(sock->fd, sock->timeout);
496 } else if (status == 0) {
502 status = pcap_next_ex(sock->pcap, &hdr, &capbuf);
505 memcpy(buf, capbuf, MIN(len, hdr->caplen));
510 pcap_perror(sock->pcap, "pcap_next_ex");
513 fprintf(stderr, "pcap_next_ex: returned %d.\n", status);
518 int ethsock_send(struct ethsock *sock, void *buf, size_t len)
520 #ifdef NMRPFLASH_WINDOWS
521 if (pcap_sendpacket(sock->pcap, buf, len) == 0) {
524 pcap_perror(sock->pcap, "pcap_sendpacket");
528 if (pcap_inject(sock->pcap, buf, len) == len) {
531 pcap_perror(sock->pcap, "pcap_inject");
537 int ethsock_close(struct ethsock *sock)
543 #ifdef NMRPFLASH_LINUX
545 set_stp_enabled(sock->intf, true);
549 pcap_close(sock->pcap);
556 inline int ethsock_set_timeout(struct ethsock *sock, unsigned msec)
558 sock->timeout = msec;
562 #ifndef NMRPFLASH_WINDOWS
563 int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
568 int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
573 static int ethsock_arp(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
577 .dwIndex = sock->index,
580 .dwType = MIB_IPNET_TYPE_STATIC
583 memcpy(arp.bPhysAddr, hwaddr, 6);
586 ret = CreateIpNetEntry(&arp);
587 if (ret != NO_ERROR) {
588 win_perror2("CreateIpNetEntry", ret);
592 *undo = malloc(sizeof(struct ethsock_arp_undo));
598 (*undo)->ipaddr = ipaddr;
599 memcpy((*undo)->hwaddr, hwaddr, 6);
601 DeleteIpNetEntry(&arp);
607 int ethsock_arp_add(struct ethsock *sock, uint8_t *hwaddr, uint32_t ipaddr, struct ethsock_arp_undo **undo)
609 ethsock_arp(sock, hwaddr, ipaddr, NULL);
610 return undo ? ethsock_arp(sock, hwaddr, ipaddr, undo) : -1;
613 int ethsock_arp_del(struct ethsock *sock, struct ethsock_arp_undo **undo)
619 int ret = ethsock_arp(sock, (*undo)->hwaddr, (*undo)->ipaddr, NULL);
626 static bool get_hwaddr_from_pcap(const pcap_if_t *dev, uint8_t *hwaddr)
629 #ifndef NMRPFLASH_WINDOWS
633 for (addr = dev->addresses; addr; addr = addr->next) {
635 printf("%s: sa_family=%d, sa_data={ ", dev->name,
636 addr->addr->sa_family);
637 for (i = 0; i != sizeof(addr->addr->sa_data); ++i) {
638 printf("%02x ", addr->addr->sa_data[i] & 0xff);
643 if (sockaddr_get_hwaddr(addr->addr, hwaddr)) {
649 return get_intf_info(dev->name, hwaddr, &is_bridge);
652 int ethsock_list_all(void)
654 pcap_if_t *devs, *dev;
657 unsigned dev_num = 0, dev_ok = 0;
658 #ifdef NMRPFLASH_WINDOWS
662 if (x_pcap_findalldevs(&devs) != 0) {
666 memset(hwaddr, 0, 6);
668 for (dev = devs; dev; dev = dev->next, ++dev_num) {
669 if (dev->flags & PCAP_IF_LOOPBACK) {
671 printf("%-15s (loopback device)\n", dev->name);
676 if (!get_hwaddr_from_pcap(dev, hwaddr)) {
678 printf("%-15s (not an ethernet device)\n",
684 #ifndef NMRPFLASH_WINDOWS
685 printf("%-15s", dev->name);
687 /* Call this here so *_perror() calls don't happen within a line */
688 pretty = intf_get_pretty_name(dev->name);
691 printf("%s%u", NMRPFLASH_NETALIAS_PREFIX, dev_num);
693 printf("%s", dev->name);
697 for (addr = dev->addresses; addr; addr = addr->next) {
698 if (addr->addr->sa_family == AF_INET) {
700 inet_ntoa(((struct sockaddr_in*)addr->addr)->sin_addr));
706 printf(" %-15s", "0.0.0.0");
709 printf(" %s", mac_to_str(hwaddr));
711 #ifdef NMRPFLASH_WINDOWS
713 printf(" (%s)", pretty);
714 } else if (dev->description) {
715 printf(" (%s)", dev->description);
724 printf("No suitable network interfaces found.\n");
730 int ethsock_for_each_ip(struct ethsock *sock, ethsock_ip_callback_t callback,
733 struct ethsock_ip_callback_args args;
734 pcap_if_t *devs, *dev;
738 if (x_pcap_findalldevs(&devs) != 0) {
744 for (dev = devs; dev; dev = dev->next) {
745 if (strcmp(sock->intf, dev->name)) {
749 for (addr = dev->addresses; addr; addr = addr->next) {
750 if (addr->addr->sa_family == AF_INET) {
751 args.ipaddr = &((struct sockaddr_in*)addr->addr)->sin_addr;
752 args.ipmask = &((struct sockaddr_in*)addr->netmask)->sin_addr;
754 status = callback(&args);
764 pcap_freealldevs(devs);
766 return status <= 0 ? status : 0;
769 static inline void set_addr(void *p, uint32_t addr)
771 struct sockaddr_in* sin = p;
772 sin->sin_family = AF_INET;
773 sin->sin_addr.s_addr = addr;
775 ((struct sockaddr*)p)->sa_len = sizeof(struct sockaddr_in);
779 #ifndef NMRPFLASH_WINDOWS
780 static bool set_interface_up(int fd, const char *intf, bool up)
783 strncpy(ifr.ifr_name, intf, IFNAMSIZ);
785 if (ioctl(fd, SIOCGIFFLAGS, &ifr) != 0) {
787 xperror("ioctl(SIOCGIFFLAGS)");
793 ifr.ifr_flags &= ~(IFF_UP | IFF_RUNNING);
795 ifr.ifr_flags |= IFF_UP | IFF_RUNNING;
798 if (ioctl(fd, SIOCSIFFLAGS, &ifr) != 0) {
800 xperror("ioctl(SIOCSIFFLAGS)");
810 int ethsock_ip_add(struct ethsock *sock, uint32_t ipaddr, uint32_t ipmask, struct ethsock_ip_undo **undo)
812 if (undo && !(*undo = malloc(sizeof(struct ethsock_ip_undo)))) {
818 int fd = socket(AF_INET, SOCK_DGRAM, 0);
820 sock_perror("socket");
824 #ifndef NMRPFLASH_WINDOWS
825 // XXX: undo is non-zero only if we're adding an IP
827 #ifdef NMRPFLASH_LINUX
829 strncpy(ifr.ifr_name, sock->intf, IFNAMSIZ);
830 // FIXME: automatically determine the next free alias
831 strcat(ifr.ifr_name, ":42");
834 set_addr(&ifr.ifr_addr, ipaddr);
835 if (ioctl(fd, SIOCSIFADDR, &ifr) != 0) {
836 xperror("ioctl(SIOSIFADDR)");
840 set_addr(&ifr.ifr_netmask, ipmask);
841 if (ioctl(fd, SIOCSIFNETMASK, &ifr) != 0) {
842 xperror("ioctl(SIOCSIFNETMASK)");
846 (*undo)->ip[0] = ipaddr;
847 (*undo)->ip[1] = ipmask;
850 if (!set_interface_up(fd, ifr.ifr_name, add)) {
853 #else // NMRPFLASH_OSX (or any other BSD)
854 struct ifaliasreq ifra;
855 memset(&ifra, 0, sizeof(ifra));
856 strncpy(ifra.ifra_name, sock->intf, IFNAMSIZ);
858 set_addr(&ifra.ifra_addr, ipaddr);
859 set_addr(&ifra.ifra_mask, ipmask);
860 //set_addr(&ifra.ifra_broadaddr, (ipaddr & ipmask) | ~ipmask);
862 if (ioctl(fd, add ? SIOCAIFADDR : SIOCDIFADDR, &ifra) != 0) {
864 xperror("ioctl(SIOCAIFADDR");
870 (*undo)->ip[0] = ipaddr;
871 (*undo)->ip[1] = ipmask;
872 set_interface_up(fd, ifra.ifra_name, true);
876 #else // NMRPFLASH_WINDOWS
877 struct sockaddr_in sin;
880 (*undo)->context = 0;
882 DWORD err = AddIPAddress(ipaddr, ipmask, sock->index, &(*undo)->context, &instance);
883 if (err != NO_ERROR && err != ERROR_DUP_DOMAINNAME && err != ERROR_OBJECT_ALREADY_EXISTS) {
884 win_perror2("AddIPAddress", err);
888 set_addr(&sin, ipaddr);
889 time_t beg = time_monotonic();
891 /* Wait until the new IP has actually been added */
893 while (bind(fd, (struct sockaddr*)&sin, sizeof(sin)) != 0) {
894 if ((time_monotonic() - beg) >= 5) {
895 fprintf(stderr, "Failed to bind after 5 seconds: ");
897 DeleteIPAddress((*undo)->context);
905 #ifndef NMRPFLASH_WINDOWS
910 if (ret != 0 && undo) {
918 int ethsock_ip_del(struct ethsock *sock, struct ethsock_ip_undo **undo)
926 #ifndef NMRPFLASH_WINDOWS
927 if ((*undo)->ip[0] != INADDR_NONE) {
928 ret = ethsock_ip_add(sock, (*undo)->ip[0], (*undo)->ip[1], NULL);
933 DeleteIPAddress((*undo)->context);