mirror of
https://github.com/nmap/nmap.git
synced 2026-01-05 22:19:03 +00:00
Break up the getinterfaces function, which did one thing for Windows and
another thing otherwise in a big if/else. Now getinterfaces just does caching and getinterfaces_dnet or getinterfaces_siocgifconf does the actual interface lookup.
This commit is contained in:
david
325
tcpip.cc
325
tcpip.cc
@@ -2817,6 +2817,8 @@ for(i=0; i < numdevs; i++) {
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return -1;
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}
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/* This struct is abused to carry either routes or interfaces, depending on the
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function it's used in. */
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struct dnet_collector_route_nfo {
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struct sys_route *routes;
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int numroutes;
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@@ -2881,35 +2883,42 @@ static int collect_dnet_interfaces(const struct intf_entry *entry, void *arg) {
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}
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return 0;
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}
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#endif /* WIN32 */
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pcap_if_t *getpcapinterfaces() {
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#ifndef WIN32
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return NULL;
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#endif
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pcap_if_t *p_ifaces;
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/* Get a list of interfaces using dnet and intf_loop. */
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static struct interface_info *getinterfaces_dnet(int *howmany) {
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struct dnet_collector_route_nfo dcrn;
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intf_t *it;
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if((pcap_findalldevs(&p_ifaces, NULL)) == -1) {
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fatal("pcap_findalldevs() : Cannot retrieve pcap interfaces");
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return NULL;
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}
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return p_ifaces;
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dcrn.routes = NULL;
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dcrn.numroutes = 0;
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dcrn.numifaces = 0;
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/* Initialize the interface array. */
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dcrn.capacity = 16;
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dcrn.ifaces = (struct interface_info *) safe_zalloc(sizeof(struct interface_info) * dcrn.capacity);
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it = intf_open();
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if (!it)
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fatal("%s: intf_open() failed", __func__);
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if (intf_loop(it, collect_dnet_interfaces, &dcrn) != 0)
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fatal("%s: intf_loop() failed", __func__);
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intf_close(it);
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*howmany = dcrn.numifaces;
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return dcrn.ifaces;
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}
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struct interface_info *getinterfaces(int *howmany) {
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static bool initialized = 0;
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static struct interface_info *mydevs;
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static int numifaces = 0;
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#else /* !WIN32 */
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/* Get a list of interfaces using ioctl(SIOCGIFCONF). */
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static struct interface_info *getinterfaces_siocgifconf(int *howmany) {
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struct interface_info *mydevs;
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int numifaces = 0;
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int ii_capacity = 0;
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#if WIN32
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struct dnet_collector_route_nfo dcrn;
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intf_t *it;
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#else //!WIN32
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int sd;
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int sd;
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struct ifconf ifc;
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struct ifreq *ifr;
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struct ifreq tmpifr;
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#endif
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int len, rc;
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char *p;
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u8 *buf;
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@@ -2917,157 +2926,162 @@ int sd;
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struct sockaddr_in *sin;
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u16 ifflags;
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if (!initialized) {
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initialized = 1;
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ii_capacity = 16;
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mydevs = (struct interface_info *) safe_zalloc(sizeof(struct interface_info) * ii_capacity);
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ii_capacity = 16;
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mydevs = (struct interface_info *) safe_zalloc(sizeof(struct interface_info) * ii_capacity);
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#if WIN32
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/* On Win32 we just use Dnet to determine the interface list */
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dcrn.routes = NULL;
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dcrn.numroutes = 0;
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dcrn.capacity = ii_capacity; // I'm reusing this struct for ii now
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dcrn.ifaces = mydevs;
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dcrn.numifaces = 0;
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it = intf_open();
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if (!it) fatal("%s: intf_open() failed", __func__);
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if (intf_loop(it, collect_dnet_interfaces, &dcrn) != 0)
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fatal("%s: intf_loop() failed", __func__);
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intf_close(it);
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mydevs = dcrn.ifaces;
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numifaces = dcrn.numifaces;
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ii_capacity = dcrn.capacity;
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#else // !Win32
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/* Dummy socket for ioctl */
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sd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sd < 0) pfatal("socket in %s", __func__);
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bufsz = 20480;
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buf = (u8 *) safe_zalloc(bufsz);
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ifc.ifc_len = bufsz;
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ifc.ifc_buf = (char *) buf;
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if (ioctl(sd, SIOCGIFCONF, &ifc) < 0) {
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fatal("Failed to determine your configured interfaces!\n");
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}
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ifr = (struct ifreq *) buf;
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if (ifc.ifc_len == 0)
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fatal("%s: SIOCGIFCONF claims you have no network interfaces!\n", __func__);
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/* Dummy socket for ioctl */
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sd = socket(AF_INET, SOCK_DGRAM, 0);
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if (sd < 0) pfatal("socket in %s", __func__);
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bufsz = 20480;
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buf = (u8 *) safe_zalloc(bufsz);
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ifc.ifc_len = bufsz;
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ifc.ifc_buf = (char *) buf;
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if (ioctl(sd, SIOCGIFCONF, &ifc) < 0) {
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fatal("Failed to determine your configured interfaces!\n");
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}
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ifr = (struct ifreq *) buf;
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if (ifc.ifc_len == 0)
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fatal("%s: SIOCGIFCONF claims you have no network interfaces!\n", __func__);
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#if HAVE_SOCKADDR_SA_LEN
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/* len = MAX(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);*/
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len = ifr->ifr_addr.sa_len + sizeof(ifr->ifr_name);
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/* len = MAX(sizeof(struct sockaddr), ifr->ifr_addr.sa_len);*/
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len = ifr->ifr_addr.sa_len + sizeof(ifr->ifr_name);
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#else
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len = sizeof(struct ifreq);
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/* len = sizeof(SA); */
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len = sizeof(struct ifreq);
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/* len = sizeof(SA); */
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#endif
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/* Debugging code
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printf("ifnet list length = %d\n",ifc.ifc_len);
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printf("sa_len = %d\n",len);
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hdump((unsigned char *) buf, ifc.ifc_len);
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/* Debugging code
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printf("ifnet list length = %d\n",ifc.ifc_len);
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printf("sa_len = %d\n",len);
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hdump((unsigned char *) buf, ifc.ifc_len);
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printf("ifr = %X\n",(unsigned)(*(char **)&ifr));
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printf("Size of struct ifreq: %d\n", sizeof(struct ifreq));
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*/
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for(; ifr && ifr->ifr_name[0] && ((u8 *)ifr) < buf + ifc.ifc_len;
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ifr = (struct ifreq *)(((char *)ifr) + len)) {
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/* debugging code
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printf("ifr_name size = %d\n", sizeof(ifr->ifr_name));
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printf("ifr = %X\n",(unsigned)(*(char **)&ifr));
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printf("Size of struct ifreq: %d\n", sizeof(struct ifreq));
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*/
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for(; ifr && ifr->ifr_name[0] && ((u8 *)ifr) < buf + ifc.ifc_len;
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ifr = (struct ifreq *)(((char *)ifr) + len)) {
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/* debugging code
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printf("ifr_name size = %d\n", sizeof(ifr->ifr_name));
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printf("ifr = %X\n",(unsigned)(*(char **)&ifr));
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*/
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/* On some platforms (such as FreeBSD), the length of each ifr changes
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based on the sockaddr type used, so we get the next length now */
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/* On some platforms (such as FreeBSD), the length of each ifr changes
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based on the sockaddr type used, so we get the next length now */
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#if HAVE_SOCKADDR_SA_LEN
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len = ifr->ifr_addr.sa_len + sizeof(ifr->ifr_name);
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len = ifr->ifr_addr.sa_len + sizeof(ifr->ifr_name);
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#endif
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/* skip any device with no name */
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if (!*((char *)ifr))
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continue;
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/* skip any device with no name */
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if (!*((char *)ifr))
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continue;
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/* We currently only handle IPv4 */
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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if (sin->sin_family != AF_INET)
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continue;
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memcpy(&(mydevs[numifaces].addr), sin, MIN(sizeof(mydevs[numifaces].addr), sizeof(*sin)));
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Strncpy(mydevs[numifaces].devname, ifr->ifr_name, sizeof(mydevs[numifaces].devname));
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/* devname isn't allowed to have alias qualification */
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if ((p = strchr(mydevs[numifaces].devname, ':')))
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*p = '\0';
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Strncpy(mydevs[numifaces].devfullname, ifr->ifr_name, sizeof(mydevs[numifaces].devfullname));
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/* We currently only handle IPv4 */
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sin = (struct sockaddr_in *) &ifr->ifr_addr;
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if (sin->sin_family != AF_INET)
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continue;
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memcpy(&(mydevs[numifaces].addr), sin, MIN(sizeof(mydevs[numifaces].addr), sizeof(*sin)));
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Strncpy(mydevs[numifaces].devname, ifr->ifr_name, sizeof(mydevs[numifaces].devname));
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/* devname isn't allowed to have alias qualification */
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if ((p = strchr(mydevs[numifaces].devname, ':')))
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*p = '\0';
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Strncpy(mydevs[numifaces].devfullname, ifr->ifr_name, sizeof(mydevs[numifaces].devfullname));
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Strncpy(tmpifr.ifr_name, ifr->ifr_name, sizeof(tmpifr.ifr_name));
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memcpy(&(tmpifr.ifr_addr), sin, MIN(sizeof(tmpifr.ifr_addr), sizeof(*sin)));
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rc = ioctl(sd, SIOCGIFNETMASK, &tmpifr);
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if (rc < 0 && errno != EADDRNOTAVAIL)
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pfatal("Failed to determine the netmask of %s!", tmpifr.ifr_name);
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else if (rc < 0)
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mydevs[numifaces].netmask_bits = 32;
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else {
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sin = (struct sockaddr_in *) &(tmpifr.ifr_addr); /* ifr_netmask only on Linux */
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addr_stob(&(tmpifr.ifr_addr), &mydevs[numifaces].netmask_bits);
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}
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Strncpy(tmpifr.ifr_name, ifr->ifr_name, sizeof(tmpifr.ifr_name));
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memcpy(&(tmpifr.ifr_addr), sin, MIN(sizeof(tmpifr.ifr_addr), sizeof(*sin)));
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rc = ioctl(sd, SIOCGIFNETMASK, &tmpifr);
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if (rc < 0 && errno != EADDRNOTAVAIL)
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pfatal("Failed to determine the netmask of %s!", tmpifr.ifr_name);
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else if (rc < 0)
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mydevs[numifaces].netmask_bits = 32;
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else {
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sin = (struct sockaddr_in *) &(tmpifr.ifr_addr); /* ifr_netmask only on Linux */
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addr_stob(&(tmpifr.ifr_addr), &mydevs[numifaces].netmask_bits);
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}
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// printf("ifr name=%s addr=%s, mask=%X\n", mydevs[numifaces].name, inet_ntoa(mydevs[numifaces].addr), mydevs[numifaces].netmask.s_addr);
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// printf("ifr name=%s addr=%s, mask=%X\n", mydevs[numifaces].name, inet_ntoa(mydevs[numifaces].addr), mydevs[numifaces].netmask.s_addr);
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/* Now we need to determine the device type ... this technique
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is kinda iffy ... may not be portable. */
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/* First we get the flags */
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Strncpy(tmpifr.ifr_name, ifr->ifr_name, sizeof(tmpifr.ifr_name));
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memcpy(&(tmpifr.ifr_addr), sin, MIN(sizeof(tmpifr.ifr_addr), sizeof(*sin)));
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rc = ioctl(sd, SIOCGIFFLAGS, &tmpifr);
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if (rc < 0) fatal("Failed to get IF Flags for device %s", ifr->ifr_name);
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ifflags = tmpifr.ifr_flags;
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/* Now we need to determine the device type ... this technique
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is kinda iffy ... may not be portable. */
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/* First we get the flags */
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Strncpy(tmpifr.ifr_name, ifr->ifr_name, sizeof(tmpifr.ifr_name));
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memcpy(&(tmpifr.ifr_addr), sin, MIN(sizeof(tmpifr.ifr_addr), sizeof(*sin)));
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rc = ioctl(sd, SIOCGIFFLAGS, &tmpifr);
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if (rc < 0) fatal("Failed to get IF Flags for device %s", ifr->ifr_name);
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ifflags = tmpifr.ifr_flags;
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if (ifflags & IFF_LOOPBACK)
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mydevs[numifaces].device_type = devt_loopback;
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else if (ifflags & IFF_BROADCAST) {
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mydevs[numifaces].device_type = devt_ethernet;
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/* Get the MAC Address ... */
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if (ifflags & IFF_LOOPBACK)
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mydevs[numifaces].device_type = devt_loopback;
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else if (ifflags & IFF_BROADCAST) {
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mydevs[numifaces].device_type = devt_ethernet;
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/* Get the MAC Address ... */
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#ifdef SIOCGIFHWADDR
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Strncpy(tmpifr.ifr_name, mydevs[numifaces].devname, sizeof(tmpifr.ifr_name));
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memcpy(&(tmpifr.ifr_addr), sin, MIN(sizeof(tmpifr.ifr_addr), MIN(sizeof(tmpifr.ifr_addr), sizeof(*sin))));
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rc = ioctl(sd, SIOCGIFHWADDR, &tmpifr);
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if (rc < 0 && errno != EADDRNOTAVAIL)
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pfatal("Failed to determine the MAC address of %s!", tmpifr.ifr_name);
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else if (rc >= 0)
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memcpy(mydevs[numifaces].mac, &tmpifr.ifr_addr.sa_data, 6);
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Strncpy(tmpifr.ifr_name, mydevs[numifaces].devname, sizeof(tmpifr.ifr_name));
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memcpy(&(tmpifr.ifr_addr), sin, MIN(sizeof(tmpifr.ifr_addr), MIN(sizeof(tmpifr.ifr_addr), sizeof(*sin))));
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rc = ioctl(sd, SIOCGIFHWADDR, &tmpifr);
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if (rc < 0 && errno != EADDRNOTAVAIL)
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pfatal("Failed to determine the MAC address of %s!", tmpifr.ifr_name);
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else if (rc >= 0)
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memcpy(mydevs[numifaces].mac, &tmpifr.ifr_addr.sa_data, 6);
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#else
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/* Let's just let libdnet handle it ... */
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eth_t *ethsd = eth_open_cached(mydevs[numifaces].devname);
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eth_addr_t ethaddr;
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/* Let's just let libdnet handle it ... */
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eth_t *ethsd = eth_open_cached(mydevs[numifaces].devname);
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eth_addr_t ethaddr;
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if (!ethsd) {
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error("Warning: Unable to open interface %s -- skipping it.", mydevs[numifaces].devname);
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continue;
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}
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if (eth_get(ethsd, ðaddr) != 0)
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fatal("%s: Failed to obtain MAC address for ethernet interface (%s)",
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__func__, mydevs[numifaces].devname);
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memcpy(mydevs[numifaces].mac, ethaddr.data, 6);
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if (!ethsd) {
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error("Warning: Unable to open interface %s -- skipping it.", mydevs[numifaces].devname);
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continue;
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}
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if (eth_get(ethsd, ðaddr) != 0)
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fatal("%s: Failed to obtain MAC address for ethernet interface (%s)",
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__func__, mydevs[numifaces].devname);
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memcpy(mydevs[numifaces].mac, ethaddr.data, 6);
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#endif /*SIOCGIFHWADDR*/
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}
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else if (ifflags & IFF_POINTOPOINT)
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mydevs[numifaces].device_type = devt_p2p;
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else mydevs[numifaces].device_type = devt_other;
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if (ifflags & IFF_UP)
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mydevs[numifaces].device_up = true;
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else mydevs[numifaces].device_up = false;
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numifaces++;
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if (numifaces == ii_capacity) {
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ii_capacity <<= 2;
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mydevs = (struct interface_info *) safe_realloc(mydevs, sizeof(struct interface_info) * ii_capacity);
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}
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mydevs[numifaces].devname[0] = mydevs[numifaces].devfullname[0] = '\0';
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}
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free(buf);
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close(sd);
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#endif //!WIN32
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else if (ifflags & IFF_POINTOPOINT)
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mydevs[numifaces].device_type = devt_p2p;
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else mydevs[numifaces].device_type = devt_other;
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if (ifflags & IFF_UP)
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mydevs[numifaces].device_up = true;
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else mydevs[numifaces].device_up = false;
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numifaces++;
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if (numifaces == ii_capacity) {
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ii_capacity <<= 2;
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mydevs = (struct interface_info *) safe_realloc(mydevs, sizeof(struct interface_info) * ii_capacity);
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}
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mydevs[numifaces].devname[0] = mydevs[numifaces].devfullname[0] = '\0';
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}
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if (howmany) *howmany = numifaces;
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free(buf);
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close(sd);
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*howmany = numifaces;
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return mydevs;
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}
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#endif
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/* Returns an allocated array of struct interface_info representing the
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available interfaces. The number of interfaces is returned in *howmany. This
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function just does caching of results; the real work is done in
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getinterfaces_dnet or getinterfaces_siocgifconf. */
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struct interface_info *getinterfaces(int *howmany) {
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static bool initialized = 0;
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static struct interface_info *mydevs;
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static int numifaces = 0;
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if (!initialized) {
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#if WIN32
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/* On Win32 we just use Dnet to determine the interface list */
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mydevs = getinterfaces_dnet(&numifaces);
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#else
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mydevs = getinterfaces_siocgifconf(&numifaces);
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#endif
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initialized = 1;
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}
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if (howmany)
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*howmany = numifaces;
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return mydevs;
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}
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@@ -3090,6 +3104,19 @@ struct interface_info *getInterfaceByName(char *iname) {
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return NULL;
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}
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pcap_if_t *getpcapinterfaces() {
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#ifndef WIN32
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return NULL;
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#endif
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pcap_if_t *p_ifaces;
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if((pcap_findalldevs(&p_ifaces, NULL)) == -1) {
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fatal("pcap_findalldevs() : Cannot retrieve pcap interfaces");
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return NULL;
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}
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return p_ifaces;
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}
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/* A trivial function used with qsort to sort the routes by netmask */
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static int nmaskcmp(const void *a, const void *b) {
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Reference in New Issue
Block a user