/* * Copyright (c) 2002 - 2003 * NetGroup, Politecnico di Torino (Italy) * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the Politecnico di Torino nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ #ifndef lint static const char rcsid[] _U_ = "@(#) $Header: /tcpdump/master/libpcap/fad-win32.c,v 1.11.2.1 2005/09/01 22:07:41 risso Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H #include "config.h" #endif #include #include #include #include /* * Add an entry to the list of addresses for an interface. * "curdev" is the entry for that interface. */ static int add_addr_to_list(pcap_if_t *curdev, struct sockaddr *addr, struct sockaddr *netmask, struct sockaddr *broadaddr, struct sockaddr *dstaddr, char *errbuf) { pcap_addr_t *curaddr, *prevaddr, *nextaddr; /* * Allocate the new entry and fill it in. */ curaddr = (pcap_addr_t*)malloc(sizeof(pcap_addr_t)); if (curaddr == NULL) { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); return (-1); } curaddr->next = NULL; if (addr != NULL) { curaddr->addr = (struct sockaddr*)dup_sockaddr(addr, sizeof(struct sockaddr_storage)); if (curaddr->addr == NULL) { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); free(curaddr); return (-1); } } else curaddr->addr = NULL; if (netmask != NULL) { curaddr->netmask = (struct sockaddr*)dup_sockaddr(netmask, sizeof(struct sockaddr_storage)); if (curaddr->netmask == NULL) { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); free(curaddr); return (-1); } } else curaddr->netmask = NULL; if (broadaddr != NULL) { curaddr->broadaddr = (struct sockaddr*)dup_sockaddr(broadaddr, sizeof(struct sockaddr_storage)); if (curaddr->broadaddr == NULL) { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); free(curaddr); return (-1); } } else curaddr->broadaddr = NULL; if (dstaddr != NULL) { curaddr->dstaddr = (struct sockaddr*)dup_sockaddr(dstaddr, sizeof(struct sockaddr_storage)); if (curaddr->dstaddr == NULL) { (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "malloc: %s", pcap_strerror(errno)); free(curaddr); return (-1); } } else curaddr->dstaddr = NULL; /* * Find the end of the list of addresses. */ for (prevaddr = curdev->addresses; prevaddr != NULL; prevaddr = nextaddr) { nextaddr = prevaddr->next; if (nextaddr == NULL) { /* * This is the end of the list. */ break; } } if (prevaddr == NULL) { /* * The list was empty; this is the first member. */ curdev->addresses = curaddr; } else { /* * "prevaddr" is the last member of the list; append * this member to it. */ prevaddr->next = curaddr; } return (0); } static int pcap_add_if_win32(pcap_if_t **devlist, char *name, const char *desc, char *errbuf) { pcap_if_t *curdev; npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES]; LONG if_addr_size; int res = 0; if_addr_size = MAX_NETWORK_ADDRESSES; /* * Add an entry for this interface, with no addresses. */ if (add_or_find_if(&curdev, devlist, name, 0, desc, errbuf) == -1) { /* * Failure. */ return (-1); } /* * Get the list of addresses for the interface. */ if (!PacketGetNetInfoEx((void *)name, if_addrs, &if_addr_size)) { /* * Failure. * * We don't return an error, because this can happen with * NdisWan interfaces, and we want to supply them even * if we can't supply their addresses. * * We return an entry with an empty address list. */ return (0); } /* * Now add the addresses. */ while (if_addr_size-- > 0) { /* * "curdev" is an entry for this interface; add an entry for * this address to its list of addresses. */ if(curdev == NULL) break; res = add_addr_to_list(curdev, (struct sockaddr *)&if_addrs[if_addr_size].IPAddress, (struct sockaddr *)&if_addrs[if_addr_size].SubnetMask, (struct sockaddr *)&if_addrs[if_addr_size].Broadcast, NULL, errbuf); if (res == -1) { /* * Failure. */ break; } } return (res); } /* * Get a list of all interfaces that are up and that we can open. * Returns -1 on error, 0 otherwise. * The list, as returned through "alldevsp", may be null if no interfaces * were up and could be opened. * * Win32 implementation, based on WinPcap */ int pcap_findalldevs(pcap_if_t **alldevsp, char *errbuf) { pcap_if_t *devlist = NULL; int ret = 0; const char *desc; char *AdaptersName; ULONG NameLength; char *name; if(!PacketGetAdapterNames(NULL, &NameLength) && NameLength == 0) { /* * If PacketGetAdapterNames *and* sets the lenght of the buffer to zero, * it means there was an error. */ snprintf(errbuf, PCAP_ERRBUF_SIZE, "PacketGetAdapterNames failed: %s", pcap_win32strerror()); *alldevsp = NULL; return -1; } if (NameLength > 0) AdaptersName = (char*) malloc(NameLength); else { snprintf(errbuf, PCAP_ERRBUF_SIZE, "no adapters found."); *alldevsp = NULL; return 0; } if (AdaptersName == NULL) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "Cannot allocate enough memory to list the adapters."); return (-1); } if (!PacketGetAdapterNames(AdaptersName, &NameLength)) { snprintf(errbuf, PCAP_ERRBUF_SIZE, "PacketGetAdapterNames: %s", pcap_win32strerror()); free(AdaptersName); return (-1); } /* * "PacketGetAdapterNames()" returned a list of * null-terminated ASCII interface name strings, * terminated by a null string, followed by a list * of null-terminated ASCII interface description * strings, terminated by a null string. * This means there are two ASCII nulls at the end * of the first list. * * Find the end of the first list; that's the * beginning of the second list. */ desc = &AdaptersName[0]; while (*desc != '\0' || *(desc + 1) != '\0') desc++; /* * Found it - "desc" points to the first of the two * nulls at the end of the list of names, so the * first byte of the list of descriptions is two bytes * after it. */ desc += 2; /* * Loop over the elements in the first list. */ name = &AdaptersName[0]; while (*name != '\0') { /* * Add an entry for this interface. */ if (pcap_add_if_win32(&devlist, name, desc, errbuf) == -1) { /* * Failure. */ ret = -1; break; } name += strlen(name) + 1; desc += strlen(desc) + 1; } if (ret == -1) { /* * We had an error; free the list we've been constructing. */ if (devlist != NULL) { pcap_freealldevs(devlist); devlist = NULL; } } *alldevsp = devlist; free(AdaptersName); return (ret); }