+/* -*- Mode: c; tab-width: 8; indent-tabs-mode: 1; c-basic-offset: 8; -*- */
/*
* Copyright (c) 1994, 1995, 1996, 1997, 1998
* The Regents of the University of California. All rights reserved.
*/
#ifndef lint
-static const char rcsid[] =
- "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.22.1.1 1999-10-07 23:46:40 mcr Exp $ (LBL)";
+static const char rcsid[] _U_ =
+ "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.75.2.4 2008-04-20 18:19:24 guy Exp $ (LBL)";
#endif
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef WIN32
+#include <pcap-stdinc.h>
+#else /* WIN32 */
+
#include <sys/param.h>
+#ifndef MSDOS
#include <sys/file.h>
+#endif
#include <sys/ioctl.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
-#include <sys/time.h> /* concession to AIX */
-
-#if __STDC__
-struct mbuf;
-struct rtentry;
-#endif
+struct mbuf; /* Squelch compiler warnings on some platforms for */
+struct rtentry; /* declarations in <net/if.h> */
#include <net/if.h>
#include <netinet/in.h>
+#endif /* WIN32 */
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#if !defined(WIN32) && !defined(__BORLANDC__)
#include <unistd.h>
+#endif /* !WIN32 && !__BORLANDC__ */
+#ifdef HAVE_LIMITS_H
+#include <limits.h>
+#else
+#define INT_MAX 2147483647
+#endif
#include "pcap-int.h"
-#include "gnuc.h"
#ifdef HAVE_OS_PROTO_H
#include "os-proto.h"
#endif
/* Not all systems have IFF_LOOPBACK */
#ifdef IFF_LOOPBACK
-#define ISLOOPBACK(p) ((p)->ifr_flags & IFF_LOOPBACK)
+#define ISLOOPBACK(name, flags) ((flags) & IFF_LOOPBACK)
#else
-#define ISLOOPBACK(p) ((p)->ifr_name[0] == 'l' && (p)->ifr_name[1] == 'o' && \
- (isdigit((p)->ifr_name[2]) || (p)->ifr_name[2] == '\0'))
+#define ISLOOPBACK(name, flags) ((name)[0] == 'l' && (name)[1] == 'o' && \
+ (isdigit((unsigned char)((name)[2])) || (name)[2] == '\0'))
#endif
-/*
- * Return the name of a network interface attached to the system, or NULL
- * if none can be found. The interface must be configured up; the
- * lowest unit number is preferred; loopback is ignored.
- */
-char *
-pcap_lookupdev(errbuf)
- register char *errbuf;
+struct sockaddr *
+dup_sockaddr(struct sockaddr *sa, size_t sa_length)
{
- register int fd, minunit, n;
- register char *cp;
- register struct ifreq *ifrp, *ifend, *ifnext, *mp;
- struct ifconf ifc;
- struct ifreq ibuf[16], ifr;
- static char device[sizeof(ifrp->ifr_name) + 1];
+ struct sockaddr *newsa;
- fd = socket(AF_INET, SOCK_DGRAM, 0);
- if (fd < 0) {
- (void)sprintf(errbuf, "socket: %s", pcap_strerror(errno));
+ if ((newsa = malloc(sa_length)) == NULL)
return (NULL);
+ return (memcpy(newsa, sa, sa_length));
+}
+
+static int
+get_instance(const char *name)
+{
+ const char *cp, *endcp;
+ int n;
+
+ if (strcmp(name, "any") == 0) {
+ /*
+ * Give the "any" device an artificially high instance
+ * number, so it shows up after all other non-loopback
+ * interfaces.
+ */
+ return INT_MAX;
}
- ifc.ifc_len = sizeof ibuf;
- ifc.ifc_buf = (caddr_t)ibuf;
- memset((char *)ibuf, 0, sizeof(ibuf));
- if (ioctl(fd, SIOCGIFCONF, (char *)&ifc) < 0 ||
- ifc.ifc_len < sizeof(struct ifreq)) {
- (void)sprintf(errbuf, "SIOCGIFCONF: %s", pcap_strerror(errno));
- (void)close(fd);
- return (NULL);
+ endcp = name + strlen(name);
+ for (cp = name; cp < endcp && !isdigit((unsigned char)*cp); ++cp)
+ continue;
+
+ if (isdigit((unsigned char)*cp))
+ n = atoi(cp);
+ else
+ n = 0;
+ return (n);
+}
+
+int
+add_or_find_if(pcap_if_t **curdev_ret, pcap_if_t **alldevs, const char *name,
+ u_int flags, const char *description, char *errbuf)
+{
+ pcap_t *p;
+ pcap_if_t *curdev, *prevdev, *nextdev;
+ int this_instance;
+
+ /*
+ * Is there already an entry in the list for this interface?
+ */
+ for (curdev = *alldevs; curdev != NULL; curdev = curdev->next) {
+ if (strcmp(name, curdev->name) == 0)
+ break; /* yes, we found it */
}
- ifrp = ibuf;
- ifend = (struct ifreq *)((char *)ibuf + ifc.ifc_len);
- mp = NULL;
- minunit = 666;
- for (; ifrp < ifend; ifrp = ifnext) {
-#ifdef HAVE_SOCKADDR_SA_LEN
- n = ifrp->ifr_addr.sa_len + sizeof(ifrp->ifr_name);
- if (n < sizeof(*ifrp))
- ifnext = ifrp + 1;
- else
- ifnext = (struct ifreq *)((char *)ifrp + n);
- if (ifrp->ifr_addr.sa_family != AF_INET)
- continue;
-#else
- ifnext = ifrp + 1;
+ if (curdev == NULL) {
+ /*
+ * No, we didn't find it.
+ *
+ * Can we open this interface for live capture?
+ *
+ * We do this check so that interfaces that are
+ * supplied by the interface enumeration mechanism
+ * we're using but that don't support packet capture
+ * aren't included in the list. Loopback interfaces
+ * on Solaris are an example of this; we don't just
+ * omit loopback interfaces on all platforms because
+ * you *can* capture on loopback interfaces on some
+ * OSes.
+ *
+ * On OS X, we don't do this check if the device
+ * name begins with "wlt"; at least some versions
+ * of OS X offer monitor mode capturing by having
+ * a separate "monitor mode" device for each wireless
+ * adapter, rather than by implementing the ioctls
+ * that {Free,Net,Open,DragonFly}BSD provide.
+ * Opening that device puts the adapter into monitor
+ * mode, which, at least for some adapters, causes
+ * them to deassociate from the network with which
+ * they're associated.
+ *
+ * Instead, we try to open the corresponding "en"
+ * device (so that we don't end up with, for users
+ * without sufficient privilege to open capture
+ * devices, a list of adapters that only includes
+ * the wlt devices).
+ */
+#ifdef __APPLE__
+ if (strncmp(name, "wlt", 3) == 0) {
+ char *en_name;
+ size_t en_name_len;
+
+ /*
+ * Try to allocate a buffer for the "en"
+ * device's name.
+ */
+ en_name_len = strlen(name) - 1;
+ en_name = malloc(en_name_len + 1);
+ if (en_name == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ return (-1);
+ }
+ strcpy(en_name, "en");
+ strcat(en_name, name + 3);
+ p = pcap_open_live(en_name, 68, 0, 0, errbuf);
+ free(en_name);
+ } else
+#endif /* __APPLE */
+ p = pcap_open_live(name, 68, 0, 0, errbuf);
+ if (p == NULL) {
+ /*
+ * No. Don't bother including it.
+ * Don't treat this as an error, though.
+ */
+ *curdev_ret = NULL;
+ return (0);
+ }
+ pcap_close(p);
+
+ /*
+ * Yes, we can open it.
+ * Allocate a new entry.
+ */
+ curdev = malloc(sizeof(pcap_if_t));
+ if (curdev == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ return (-1);
+ }
+
+ /*
+ * Fill in the entry.
+ */
+ curdev->next = NULL;
+ curdev->name = strdup(name);
+ if (curdev->name == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ free(curdev);
+ return (-1);
+ }
+ if (description != NULL) {
+ /*
+ * We have a description for this interface.
+ */
+ curdev->description = strdup(description);
+ if (curdev->description == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ free(curdev->name);
+ free(curdev);
+ return (-1);
+ }
+ } else {
+ /*
+ * We don't.
+ */
+ curdev->description = NULL;
+ }
+ curdev->addresses = NULL; /* list starts out as empty */
+ curdev->flags = 0;
+ if (ISLOOPBACK(name, flags))
+ curdev->flags |= PCAP_IF_LOOPBACK;
+
+ /*
+ * Add it to the list, in the appropriate location.
+ * First, get the instance number of this interface.
+ */
+ this_instance = get_instance(name);
+
+ /*
+ * Now look for the last interface with an instance number
+ * less than or equal to the new interface's instance
+ * number - except that non-loopback interfaces are
+ * arbitrarily treated as having interface numbers less
+ * than those of loopback interfaces, so the loopback
+ * interfaces are put at the end of the list.
+ *
+ * We start with "prevdev" being NULL, meaning we're before
+ * the first element in the list.
+ */
+ prevdev = NULL;
+ for (;;) {
+ /*
+ * Get the interface after this one.
+ */
+ if (prevdev == NULL) {
+ /*
+ * The next element is the first element.
+ */
+ nextdev = *alldevs;
+ } else
+ nextdev = prevdev->next;
+
+ /*
+ * Are we at the end of the list?
+ */
+ if (nextdev == NULL) {
+ /*
+ * Yes - we have to put the new entry
+ * after "prevdev".
+ */
+ break;
+ }
+
+ /*
+ * Is the new interface a non-loopback interface
+ * and the next interface a loopback interface?
+ */
+ if (!(curdev->flags & PCAP_IF_LOOPBACK) &&
+ (nextdev->flags & PCAP_IF_LOOPBACK)) {
+ /*
+ * Yes, we should put the new entry
+ * before "nextdev", i.e. after "prevdev".
+ */
+ break;
+ }
+
+ /*
+ * Is the new interface's instance number less
+ * than the next interface's instance number,
+ * and is it the case that the new interface is a
+ * non-loopback interface or the next interface is
+ * a loopback interface?
+ *
+ * (The goal of both loopback tests is to make
+ * sure that we never put a loopback interface
+ * before any non-loopback interface and that we
+ * always put a non-loopback interface before all
+ * loopback interfaces.)
+ */
+ if (this_instance < get_instance(nextdev->name) &&
+ (!(curdev->flags & PCAP_IF_LOOPBACK) ||
+ (nextdev->flags & PCAP_IF_LOOPBACK))) {
+ /*
+ * Yes - we should put the new entry
+ * before "nextdev", i.e. after "prevdev".
+ */
+ break;
+ }
+
+ prevdev = nextdev;
+ }
+
+ /*
+ * Insert before "nextdev".
+ */
+ curdev->next = nextdev;
+
+ /*
+ * Insert after "prevdev" - unless "prevdev" is null,
+ * in which case this is the first interface.
+ */
+ if (prevdev == NULL) {
+ /*
+ * This is the first interface. Pass back a
+ * pointer to it, and put "curdev" before
+ * "nextdev".
+ */
+ *alldevs = curdev;
+ } else
+ prevdev->next = curdev;
+ }
+
+ *curdev_ret = curdev;
+ return (0);
+}
+
+/*
+ * XXX - on FreeBSDs that support it, should it get the sysctl named
+ * "dev.{adapter family name}.{adapter unit}.%desc" to get a description
+ * of the adapter? Note that "dev.an.0.%desc" is "Aironet PC4500/PC4800"
+ * with my Cisco 350 card, so the name isn't entirely descriptive. The
+ * "dev.an.0.%pnpinfo" has a better description, although one might argue
+ * that the problem is really a driver bug - if it can find out that it's
+ * a Cisco 340 or 350, rather than an old Aironet card, it should use
+ * that in the description.
+ *
+ * Do NetBSD, DragonflyBSD, or OpenBSD support this as well? OpenBSD
+ * lets you get a description, but it's not generated by the OS, it's
+ * set with another ioctl that ifconfig supports; we use that to get
+ * the description in OpenBSD.
+ *
+ * In OS X, the System Configuration framework can apparently return
+ * names in 10.4 and later; it also appears that freedesktop.org's HAL
+ * offers an "info.product" string, but the HAL specification says
+ * it "should not be used in any UI" and "subsystem/capability
+ * specific properties" should be used instead. Using that would
+ * require that libpcap applications be linked with the frameworks/
+ * libraries in question, which would be a bit of a pain unless we
+ * offer, for example, a pkg-config:
+ *
+ * http://pkg-config.freedesktop.org/wiki/
+ *
+ * script, so applications can just use that script to find out what
+ * libraries you need to link with when linking with libpcap.
+ * pkg-config is GPLed; I don't know whether that would prevent its
+ * use with a BSD-licensed library such as libpcap.
+ *
+ * Do any other UN*Xes, or desktop environments support getting a
+ * description?
+ */
+int
+add_addr_to_iflist(pcap_if_t **alldevs, const char *name, u_int flags,
+ struct sockaddr *addr, size_t addr_size,
+ struct sockaddr *netmask, size_t netmask_size,
+ struct sockaddr *broadaddr, size_t broadaddr_size,
+ struct sockaddr *dstaddr, size_t dstaddr_size,
+ char *errbuf)
+{
+ pcap_if_t *curdev;
+ char *description = NULL;
+ pcap_addr_t *curaddr, *prevaddr, *nextaddr;
+#ifdef SIOCGIFDESCR
+ struct ifreq ifrdesc;
+ char ifdescr[IFDESCRSIZE];
+ int s;
#endif
+
+#ifdef SIOCGIFDESCR
+ /*
+ * Get the description for the interface.
+ */
+ memset(&ifrdesc, 0, sizeof ifrdesc);
+ strlcpy(ifrdesc.ifr_name, name, sizeof ifrdesc.ifr_name);
+ ifrdesc.ifr_data = (caddr_t)&ifdescr;
+ s = socket(AF_INET, SOCK_DGRAM, 0);
+ if (s >= 0) {
+ if (ioctl(s, SIOCGIFDESCR, &ifrdesc) == 0 &&
+ strlen(ifrdesc.ifr_data) != 0)
+ description = ifrdesc.ifr_data;
+ close(s);
+ }
+#endif
+
+ if (add_or_find_if(&curdev, alldevs, name, flags, description,
+ errbuf) == -1) {
+ /*
+ * Error - give up.
+ */
+ return (-1);
+ }
+ if (curdev == NULL) {
/*
- * Need a template to preserve address info that is
- * used below to locate the next entry. (Otherwise,
- * SIOCGIFFLAGS stomps over it because the requests
- * are returned in a union.)
+ * Device wasn't added because it can't be opened.
+ * Not a fatal error.
*/
- strncpy(ifr.ifr_name, ifrp->ifr_name, sizeof(ifr.ifr_name));
- if (ioctl(fd, SIOCGIFFLAGS, (char *)&ifr) < 0) {
- if (errno == ENXIO)
- continue;
- (void)sprintf(errbuf, "SIOCGIFFLAGS: %.*s: %s",
- (int)sizeof(ifr.ifr_name), ifr.ifr_name,
- pcap_strerror(errno));
- (void)close(fd);
- return (NULL);
+ return (0);
+ }
+
+ /*
+ * "curdev" is an entry for this interface; add an entry for this
+ * address to its list of addresses.
+ *
+ * Allocate the new entry and fill it in.
+ */
+ curaddr = 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 = dup_sockaddr(addr, addr_size);
+ if (curaddr->addr == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ free(curaddr);
+ return (-1);
}
+ } else
+ curaddr->addr = NULL;
- /* Must be up and not the loopback */
- if ((ifr.ifr_flags & IFF_UP) == 0 || ISLOOPBACK(&ifr))
- continue;
+ if (netmask != NULL) {
+ curaddr->netmask = dup_sockaddr(netmask, netmask_size);
+ if (curaddr->netmask == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ if (curaddr->addr != NULL)
+ free(curaddr->addr);
+ free(curaddr);
+ return (-1);
+ }
+ } else
+ curaddr->netmask = NULL;
- for (cp = ifrp->ifr_name; !isdigit(*cp); ++cp)
- continue;
- n = atoi(cp);
- if (n < minunit) {
- minunit = n;
- mp = ifrp;
+ if (broadaddr != NULL) {
+ curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size);
+ if (curaddr->broadaddr == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ if (curaddr->netmask != NULL)
+ free(curaddr->netmask);
+ if (curaddr->addr != NULL)
+ free(curaddr->addr);
+ free(curaddr);
+ return (-1);
+ }
+ } else
+ curaddr->broadaddr = NULL;
+
+ if (dstaddr != NULL) {
+ curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size);
+ if (curaddr->dstaddr == NULL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "malloc: %s", pcap_strerror(errno));
+ if (curaddr->broadaddr != NULL)
+ free(curaddr->broadaddr);
+ if (curaddr->netmask != NULL)
+ free(curaddr->netmask);
+ if (curaddr->addr != NULL)
+ free(curaddr->addr);
+ 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;
}
}
- (void)close(fd);
- if (mp == NULL) {
- (void)strcpy(errbuf, "no suitable device found");
+
+ 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);
+}
+
+int
+pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags,
+ const char *description, char *errbuf)
+{
+ pcap_if_t *curdev;
+
+ return (add_or_find_if(&curdev, devlist, name, flags, description,
+ errbuf));
+}
+
+
+/*
+ * Free a list of interfaces.
+ */
+void
+pcap_freealldevs(pcap_if_t *alldevs)
+{
+ pcap_if_t *curdev, *nextdev;
+ pcap_addr_t *curaddr, *nextaddr;
+
+ for (curdev = alldevs; curdev != NULL; curdev = nextdev) {
+ nextdev = curdev->next;
+
+ /*
+ * Free all addresses.
+ */
+ for (curaddr = curdev->addresses; curaddr != NULL; curaddr = nextaddr) {
+ nextaddr = curaddr->next;
+ if (curaddr->addr)
+ free(curaddr->addr);
+ if (curaddr->netmask)
+ free(curaddr->netmask);
+ if (curaddr->broadaddr)
+ free(curaddr->broadaddr);
+ if (curaddr->dstaddr)
+ free(curaddr->dstaddr);
+ free(curaddr);
+ }
+
+ /*
+ * Free the name string.
+ */
+ free(curdev->name);
+
+ /*
+ * Free the description string, if any.
+ */
+ if (curdev->description != NULL)
+ free(curdev->description);
+
+ /*
+ * Free the interface.
+ */
+ free(curdev);
+ }
+}
+
+#if !defined(WIN32) && !defined(MSDOS)
+
+/*
+ * Return the name of a network interface attached to the system, or NULL
+ * if none can be found. The interface must be configured up; the
+ * lowest unit number is preferred; loopback is ignored.
+ */
+char *
+pcap_lookupdev(errbuf)
+ register char *errbuf;
+{
+ pcap_if_t *alldevs;
+/* for old BSD systems, including bsdi3 */
+#ifndef IF_NAMESIZE
+#define IF_NAMESIZE IFNAMSIZ
+#endif
+ static char device[IF_NAMESIZE + 1];
+ char *ret;
+
+ if (pcap_findalldevs(&alldevs, errbuf) == -1)
return (NULL);
+
+ if (alldevs == NULL || (alldevs->flags & PCAP_IF_LOOPBACK)) {
+ /*
+ * There are no devices on the list, or the first device
+ * on the list is a loopback device, which means there
+ * are no non-loopback devices on the list. This means
+ * we can't return any device.
+ *
+ * XXX - why not return a loopback device? If we can't
+ * capture on it, it won't be on the list, and if it's
+ * on the list, there aren't any non-loopback devices,
+ * so why not just supply it as the default device?
+ */
+ (void)strlcpy(errbuf, "no suitable device found",
+ PCAP_ERRBUF_SIZE);
+ ret = NULL;
+ } else {
+ /*
+ * Return the name of the first device on the list.
+ */
+ (void)strlcpy(device, alldevs->name, sizeof(device));
+ ret = device;
}
- (void)strncpy(device, mp->ifr_name, sizeof(device) - 1);
- device[sizeof(device) - 1] = '\0';
- return (device);
+ pcap_freealldevs(alldevs);
+ return (ret);
}
int
pcap_lookupnet(device, netp, maskp, errbuf)
- register char *device;
+ register const char *device;
register bpf_u_int32 *netp, *maskp;
register char *errbuf;
{
register int fd;
- register struct sockaddr_in *sin;
+ register struct sockaddr_in *sin4;
struct ifreq ifr;
+ /*
+ * The pseudo-device "any" listens on all interfaces and therefore
+ * has the network address and -mask "0.0.0.0" therefore catching
+ * all traffic. Using NULL for the interface is the same as "any".
+ */
+ if (!device || strcmp(device, "any") == 0
+#ifdef HAVE_DAG_API
+ || strstr(device, "dag") != NULL
+#endif
+#ifdef HAVE_SEPTEL_API
+ || strstr(device, "septel") != NULL
+#endif
+#ifdef PCAP_SUPPORT_BT
+ || strstr(device, "bluetooth") != NULL
+#endif
+#ifdef PCAP_SUPPORT_USB
+ || strstr(device, "usb") != NULL
+#endif
+ ) {
+ *netp = *maskp = 0;
+ return 0;
+ }
+
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
- (void)sprintf(errbuf, "socket: %s", pcap_strerror(errno));
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
+ pcap_strerror(errno));
return (-1);
}
memset(&ifr, 0, sizeof(ifr));
#endif
(void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
- (void)sprintf(errbuf, "SIOCGIFADDR: %s: %s",
- device, pcap_strerror(errno));
+ if (errno == EADDRNOTAVAIL) {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "%s: no IPv4 address assigned", device);
+ } else {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCGIFADDR: %s: %s",
+ device, pcap_strerror(errno));
+ }
(void)close(fd);
return (-1);
}
- sin = (struct sockaddr_in *)&ifr.ifr_addr;
- *netp = sin->sin_addr.s_addr;
+ sin4 = (struct sockaddr_in *)&ifr.ifr_addr;
+ *netp = sin4->sin_addr.s_addr;
if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
- (void)sprintf(errbuf, "SIOCGIFNETMASK: %s: %s",
- device, pcap_strerror(errno));
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno));
(void)close(fd);
return (-1);
}
(void)close(fd);
- *maskp = sin->sin_addr.s_addr;
+ *maskp = sin4->sin_addr.s_addr;
if (*maskp == 0) {
if (IN_CLASSA(*netp))
*maskp = IN_CLASSA_NET;
else if (IN_CLASSC(*netp))
*maskp = IN_CLASSC_NET;
else {
- (void)sprintf(errbuf, "inet class for 0x%x unknown",
- *netp);
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "inet class for 0x%x unknown", *netp);
return (-1);
}
}
*netp &= *maskp;
return (0);
}
+
+#elif defined(WIN32)
+
+/*
+ * Return the name of a network interface attached to the system, or NULL
+ * if none can be found. The interface must be configured up; the
+ * lowest unit number is preferred; loopback is ignored.
+ */
+char *
+pcap_lookupdev(errbuf)
+ register char *errbuf;
+{
+ DWORD dwVersion;
+ DWORD dwWindowsMajorVersion;
+ dwVersion = GetVersion(); /* get the OS version */
+ dwWindowsMajorVersion = (DWORD)(LOBYTE(LOWORD(dwVersion)));
+
+ if (dwVersion >= 0x80000000 && dwWindowsMajorVersion >= 4) {
+ /*
+ * Windows 95, 98, ME.
+ */
+ ULONG NameLength = 8192;
+ static char AdaptersName[8192];
+
+ if (PacketGetAdapterNames(AdaptersName,&NameLength) )
+ return (AdaptersName);
+ else
+ return NULL;
+ } else {
+ /*
+ * Windows NT (NT 4.0, W2K, WXP). Convert the names to UNICODE for backward compatibility
+ */
+ ULONG NameLength = 8192;
+ static WCHAR AdaptersName[8192];
+ char *tAstr;
+ WCHAR *tUstr;
+ WCHAR *TAdaptersName = (WCHAR*)malloc(8192 * sizeof(WCHAR));
+ int NAdapts = 0;
+
+ if(TAdaptersName == NULL)
+ {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
+ return NULL;
+ }
+
+ if ( !PacketGetAdapterNames((PTSTR)TAdaptersName,&NameLength) )
+ {
+ (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "PacketGetAdapterNames: %s",
+ pcap_win32strerror());
+ free(TAdaptersName);
+ return NULL;
+ }
+
+
+ tAstr = (char*)TAdaptersName;
+ tUstr = (WCHAR*)AdaptersName;
+
+ /*
+ * Convert and copy the device names
+ */
+ while(sscanf(tAstr, "%S", tUstr) > 0)
+ {
+ tAstr += strlen(tAstr) + 1;
+ tUstr += wcslen(tUstr) + 1;
+ NAdapts ++;
+ }
+
+ tAstr++;
+ *tUstr = 0;
+ tUstr++;
+
+ /*
+ * Copy the descriptions
+ */
+ while(NAdapts--)
+ {
+ strcpy((char*)tUstr, tAstr);
+ (char*)tUstr += strlen(tAstr) + 1;;
+ tAstr += strlen(tAstr) + 1;
+ }
+
+ free(TAdaptersName);
+ return (char *)(AdaptersName);
+ }
+}
+
+
+int
+pcap_lookupnet(device, netp, maskp, errbuf)
+ register const char *device;
+ register bpf_u_int32 *netp, *maskp;
+ register char *errbuf;
+{
+ /*
+ * We need only the first IPv4 address, so we must scan the array returned by PacketGetNetInfo()
+ * in order to skip non IPv4 (i.e. IPv6 addresses)
+ */
+ npf_if_addr if_addrs[MAX_NETWORK_ADDRESSES];
+ LONG if_addr_size = 1;
+ struct sockaddr_in *t_addr;
+ unsigned int i;
+
+ if (!PacketGetNetInfoEx((void *)device, if_addrs, &if_addr_size)) {
+ *netp = *maskp = 0;
+ return (0);
+ }
+
+ for(i=0; i<MAX_NETWORK_ADDRESSES; i++)
+ {
+ if(if_addrs[i].IPAddress.ss_family == AF_INET)
+ {
+ t_addr = (struct sockaddr_in *) &(if_addrs[i].IPAddress);
+ *netp = t_addr->sin_addr.S_un.S_addr;
+ t_addr = (struct sockaddr_in *) &(if_addrs[i].SubnetMask);
+ *maskp = t_addr->sin_addr.S_un.S_addr;
+
+ *netp &= *maskp;
+ return (0);
+ }
+
+ }
+
+ *netp = *maskp = 0;
+ return (0);
+}
+
+#endif /* !WIN32 && !MSDOS */
projects / libpcap / blobdiff