* SUCH DAMAGE.
*/
-#ifndef lint
-static const char rcsid[] _U_ =
- "@(#) $Header: /tcpdump/master/libpcap/inet.c,v 1.79 2008-04-20 18:19:02 guy Exp $ (LBL)";
-#endif
-
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
-#ifdef WIN32
+#ifdef _WIN32
#include <pcap-stdinc.h>
-#else /* WIN32 */
+#else /* _WIN32 */
#include <sys/param.h>
#ifndef MSDOS
struct rtentry; /* declarations in <net/if.h> */
#include <net/if.h>
#include <netinet/in.h>
-#endif /* WIN32 */
+#endif /* _WIN32 */
#include <ctype.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
-#if !defined(WIN32) && !defined(__BORLANDC__)
+#if !defined(_WIN32) && !defined(__BORLANDC__)
#include <unistd.h>
-#endif /* !WIN32 && !__BORLANDC__ */
+#endif /* !_WIN32 && !__BORLANDC__ */
#ifdef HAVE_LIMITS_H
#include <limits.h>
#else
(isdigit((unsigned char)((name)[2])) || (name)[2] == '\0'))
#endif
+#ifdef IFF_UP
+#define ISUP(flags) ((flags) & IFF_UP)
+#else
+#define ISUP(flags) 0
+#endif
+
+#ifdef IFF_RUNNING
+#define ISRUNNING(flags) ((flags) & IFF_RUNNING)
+#else
+#define ISRUNNING(flags) 0
+#endif
+
struct sockaddr *
dup_sockaddr(struct sockaddr *sa, size_t sa_length)
{
return (memcpy(newsa, sa, sa_length));
}
-static int
-get_instance(const char *name)
+/*
+ * Construct a "figure of merit" for an interface, for use when sorting
+ * the list of interfaces, in which interfaces that are up are superior
+ * to interfaces that aren't up, interfaces that are up and running are
+ * superior to interfaces that are up but not running, and non-loopback
+ * interfaces that are up and running are superior to loopback interfaces,
+ * and interfaces with the same flags have a figure of merit that's higher
+ * the lower the instance number.
+ *
+ * The goal is to try to put the interfaces most likely to be useful for
+ * capture at the beginning of the list.
+ *
+ * The figure of merit, which is lower the "better" the interface is,
+ * has the uppermost bit set if the interface isn't running, the bit
+ * below that set if the interface isn't up, the bit below that set
+ * if the interface is a loopback interface, and the interface index
+ * in the 29 bits below that. (Yes, we assume u_int is 32 bits.)
+ */
+static u_int
+get_figure_of_merit(pcap_if_t *dev)
{
- const char *cp, *endcp;
- int n;
+ const char *cp;
+ u_int n;
- if (strcmp(name, "any") == 0) {
+ if (strcmp(dev->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;
+ n = 0x1FFFFFFF; /* 29 all-1 bits */
+ } else {
+ /*
+ * A number at the end of the device name string is
+ * assumed to be a unit number.
+ */
+ cp = dev->name + strlen(dev->name) - 1;
+ while (cp-1 >= dev->name && *(cp-1) >= '0' && *(cp-1) <= '9')
+ cp--;
+ if (*cp >= '0' && *cp <= '9')
+ n = atoi(cp);
+ else
+ n = 0;
}
-
- 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;
+ if (!(dev->flags & PCAP_IF_RUNNING))
+ n |= 0x80000000;
+ if (!(dev->flags & PCAP_IF_UP))
+ n |= 0x40000000;
+ if (dev->flags & PCAP_IF_LOOPBACK)
+ n |= 0x20000000;
return (n);
}
+/*
+ * Look for a given device in the specified list of devices.
+ *
+ * If we find it, return 0 and set *curdev_ret to point to it.
+ *
+ * If we don't find it, check whether we can open it:
+ *
+ * If that fails with PCAP_ERROR_NO_SUCH_DEVICE or
+ * PCAP_ERROR_IFACE_NOT_UP, don't attempt to add an entry for
+ * it, as that probably means it exists but doesn't support
+ * packet capture.
+ *
+ * Otherwise, attempt to add an entry for it, with the specified
+ * ifnet flags and description, and, if that succeeds, return 0
+ * and set *curdev_ret to point to the new entry, otherwise
+ * return PCAP_ERROR and set errbuf to an error message.
+ */
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;
+ u_int this_figure_of_merit, nextdev_figure_of_merit;
+ char open_errbuf[PCAP_ERRBUF_SIZE];
+ int ret;
/*
* Is there already an entry in the list for this interface?
en_name_len = strlen(name) - 1;
en_name = malloc(en_name_len + 1);
if (en_name == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_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);
+ p = pcap_create(en_name, open_errbuf);
free(en_name);
} else
#endif /* __APPLE */
- p = pcap_open_live(name, 68, 0, 0, errbuf);
+ p = pcap_create(name, open_errbuf);
if (p == NULL) {
/*
- * No. Don't bother including it.
- * Don't treat this as an error, though.
+ * The attempt to create the pcap_t failed;
+ * that's probably an indication that we're
+ * out of memory.
+ *
+ * Don't bother including this interface,
+ * but don't treat it as an error.
*/
*curdev_ret = NULL;
return (0);
}
+ /* Small snaplen, so we don't try to allocate much memory. */
+ pcap_set_snaplen(p, 68);
+ ret = pcap_activate(p);
pcap_close(p);
+ switch (ret) {
+
+ case PCAP_ERROR_NO_SUCH_DEVICE:
+ case PCAP_ERROR_IFACE_NOT_UP:
+ /*
+ * We expect these two errors - they're the
+ * reason we try to open the device.
+ *
+ * PCAP_ERROR_NO_SUCH_DEVICE typically means
+ * "there's no such device *known to the
+ * OS's capture mechanism*", so, even though
+ * it might be a valid network interface, you
+ * can't capture on it (e.g., the loopback
+ * device in Solaris up to Solaris 10, or
+ * the vmnet devices in OS X with VMware
+ * Fusion). We don't include those devices
+ * in our list of devices, as there's no
+ * point in doing so - they're not available
+ * for capture.
+ *
+ * PCAP_ERROR_IFACE_NOT_UP means that the
+ * OS's capture mechanism doesn't work on
+ * interfaces not marked as up; some capture
+ * mechanisms *do* support that, so we no
+ * longer reject those interfaces out of hand,
+ * but we *do* want to reject them if they
+ * can't be opened for capture.
+ */
+ *curdev_ret = NULL;
+ return (0);
+ }
/*
- * Yes, we can open it.
+ * Yes, we can open it, or we can't, for some other
+ * reason.
+ *
+ * If we can open it, we want to offer it for
+ * capture, as you can capture on it. If we can't,
+ * we want to offer it for capture, so that, if
+ * the user tries to capture on it, they'll get
+ * an error and they'll know why they can't
+ * capture on it (e.g., insufficient permissions)
+ * or they'll report it as a problem (and then
+ * have the error message to provide as information).
+ *
* Allocate a new entry.
*/
curdev = malloc(sizeof(pcap_if_t));
if (curdev == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
return (-1);
}
curdev->next = NULL;
curdev->name = strdup(name);
if (curdev->name == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
free(curdev);
return (-1);
*/
curdev->description = strdup(description);
if (curdev->description == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
free(curdev->name);
free(curdev);
curdev->flags = 0;
if (ISLOOPBACK(name, flags))
curdev->flags |= PCAP_IF_LOOPBACK;
+ if (ISUP(flags))
+ curdev->flags |= PCAP_IF_UP;
+ if (ISRUNNING(flags))
+ curdev->flags |= PCAP_IF_RUNNING;
/*
* Add it to the list, in the appropriate location.
- * First, get the instance number of this interface.
+ * First, get the "figure of merit" for this
+ * interface.
*/
- this_instance = get_instance(name);
+ this_figure_of_merit = get_figure_of_merit(curdev);
/*
- * 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.
+ * Now look for the last interface with an figure of merit
+ * less than or equal to the new interface's figure of
+ * merit.
*
* We start with "prevdev" being NULL, meaning we're before
* the first element in the list.
}
/*
- * Is the new interface a non-loopback interface
- * and the next interface a loopback interface?
+ * Is the new interface's figure of merit less
+ * than the next interface's figure of merit,
+ * meaning that the new interface is better
+ * than the next 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))) {
+ nextdev_figure_of_merit = get_figure_of_merit(nextdev);
+ if (this_figure_of_merit < nextdev_figure_of_merit) {
/*
* Yes - we should put the new entry
* before "nextdev", i.e. after "prevdev".
}
/*
+ * Try to get a description for a given device.
+ * Returns a mallocated description if it could and NULL if it couldn't.
+ *
* 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"
* 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)
+static char *
+get_if_description(const char *name)
{
- pcap_if_t *curdev;
- char *description = NULL;
- pcap_addr_t *curaddr, *prevaddr, *nextaddr;
#ifdef SIOCGIFDESCR
+ char *description = NULL;
int s;
struct ifreq ifrdesc;
#ifndef IFDESCRSIZE
#else
size_t descrlen = IFDESCRSIZE;
#endif /* IFDESCRSIZE */
-#endif /* SIOCGIFDESCR */
-#ifdef SIOCGIFDESCR
/*
* Get the description for the interface.
*/
description = NULL;
}
}
+
+ return (description);
+#else /* SIOCGIFDESCR */
+ return (NULL);
#endif /* SIOCGIFDESCR */
+}
+/*
+ * Try to get a description for a given device, and then look for that
+ * device in the specified list of devices.
+ *
+ * If we find it, then, if the specified address isn't null, add it to
+ * the list of addresses for the device and return 0.
+ *
+ * If we don't find it, check whether we can open it:
+ *
+ * If that fails with PCAP_ERROR_NO_SUCH_DEVICE or
+ * PCAP_ERROR_IFACE_NOT_UP, don't attempt to add an entry for
+ * it, as that probably means it exists but doesn't support
+ * packet capture.
+ *
+ * Otherwise, attempt to add an entry for it, with the specified
+ * ifnet flags and description, and, if that succeeds, add the
+ * specified address to its list of addresses if that address is
+ * non-null, set *curdev_ret to point to the new entry, and
+ * return 0, otherwise return PCAP_ERROR and set errbuf to an
+ * error message.
+ *
+ * (We can get called with a null address because we might get a list
+ * of interface name/address combinations from the underlying OS, with
+ * the address being absent in some cases, rather than a list of
+ * interfaces with each interface having a list of addresses, so this
+ * call may be the only call made to add to the list, and we want to
+ * add interfaces even if they have no addresses.)
+ */
+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)
+{
+ char *description;
+ pcap_if_t *curdev;
+
+ description = get_if_description(name);
if (add_or_find_if(&curdev, alldevs, name, flags, description,
errbuf) == -1) {
free(description);
return (0);
}
+ if (addr == NULL) {
+ /*
+ * There's no address to add; this entry just meant
+ * "here's a new interface".
+ */
+ return (0);
+ }
+
/*
- * "curdev" is an entry for this interface; add an entry for this
- * address to its list of addresses.
+ * "curdev" is an entry for this interface, and we have an
+ * address for it; add an entry for that address to the
+ * interface's list of addresses.
*
* Allocate the new entry and fill it in.
*/
+ return (add_addr_to_dev(curdev, addr, addr_size, netmask,
+ netmask_size, broadaddr, broadaddr_size, dstaddr,
+ dstaddr_size, errbuf));
+}
+
+/*
+ * Add an entry to the list of addresses for an interface.
+ * "curdev" is the entry for that interface.
+ * If this is the first IP address added to the interface, move it
+ * in the list as appropriate.
+ */
+int
+add_addr_to_dev(pcap_if_t *curdev,
+ 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_addr_t *curaddr, *prevaddr, *nextaddr;
+
curaddr = malloc(sizeof(pcap_addr_t));
if (curaddr == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
return (-1);
}
if (addr != NULL) {
curaddr->addr = dup_sockaddr(addr, addr_size);
if (curaddr->addr == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
free(curaddr);
return (-1);
if (netmask != NULL) {
curaddr->netmask = dup_sockaddr(netmask, netmask_size);
if (curaddr->netmask == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
if (curaddr->addr != NULL)
free(curaddr->addr);
if (broadaddr != NULL) {
curaddr->broadaddr = dup_sockaddr(broadaddr, broadaddr_size);
if (curaddr->broadaddr == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
if (curaddr->netmask != NULL)
free(curaddr->netmask);
if (dstaddr != NULL) {
curaddr->dstaddr = dup_sockaddr(dstaddr, dstaddr_size);
if (curaddr->dstaddr == NULL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"malloc: %s", pcap_strerror(errno));
if (curaddr->broadaddr != NULL)
free(curaddr->broadaddr);
return (0);
}
+/*
+ * Look for a given device in the specified list of devices.
+ *
+ * If we find it, return 0.
+ *
+ * If we don't find it, check whether we can open it:
+ *
+ * If that fails with PCAP_ERROR_NO_SUCH_DEVICE or
+ * PCAP_ERROR_IFACE_NOT_UP, don't attempt to add an entry for
+ * it, as that probably means it exists but doesn't support
+ * packet capture.
+ *
+ * Otherwise, attempt to add an entry for it, with the specified
+ * ifnet flags and description, and, if that succeeds, return 0
+ * and set *curdev_ret to point to the new entry, otherwise
+ * return PCAP_ERROR and set errbuf to an error message.
+ */
int
pcap_add_if(pcap_if_t **devlist, const char *name, u_int flags,
const char *description, char *errbuf)
}
}
-#if !defined(WIN32) && !defined(MSDOS)
+#if !defined(_WIN32) && !defined(MSDOS)
/*
* Return the name of a network interface attached to the system, or NULL
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
pcap_strerror(errno));
return (-1);
}
/* XXX Work around Linux kernel bug */
ifr.ifr_addr.sa_family = AF_INET;
#endif
- (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
+ (void)strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFADDR, (char *)&ifr) < 0) {
if (errno == EADDRNOTAVAIL) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"%s: no IPv4 address assigned", device);
} else {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"SIOCGIFADDR: %s: %s",
device, pcap_strerror(errno));
}
/* XXX Work around Linux kernel bug */
ifr.ifr_addr.sa_family = AF_INET;
#endif
- (void)strncpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
+ (void)strlcpy(ifr.ifr_name, device, sizeof(ifr.ifr_name));
if (ioctl(fd, SIOCGIFNETMASK, (char *)&ifr) < 0) {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"SIOCGIFNETMASK: %s: %s", device, pcap_strerror(errno));
(void)close(fd);
return (-1);
else if (IN_CLASSC(*netp))
*maskp = IN_CLASSC_NET;
else {
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
"inet class for 0x%x unknown", *netp);
return (-1);
}
return (0);
}
-#elif defined(WIN32)
+#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.
+ *
+ * In the best of all possible worlds, this would be the same as on
+ * UN*X, but there may be software that expects this to return a
+ * full list of devices after the first device.
*/
char *
pcap_lookupdev(errbuf)
{
DWORD dwVersion;
DWORD dwWindowsMajorVersion;
+ char our_errbuf[PCAP_ERRBUF_SIZE+1];
+
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
if(TAdaptersName == NULL)
{
- (void)snprintf(errbuf, PCAP_ERRBUF_SIZE, "memory allocation failure");
+ (void)pcap_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());
+ pcap_win32_err_to_str(GetLastError(), our_errbuf);
+ (void)pcap_snprintf(errbuf, PCAP_ERRBUF_SIZE,
+ "PacketGetAdapterNames: %s", our_errbuf);
free(TAdaptersName);
return NULL;
}
free(TAdaptersName);
return (char *)(AdaptersName);
- }
+ }
}
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)
*/
*netp &= *maskp;
return (0);
}
-
+
}
*netp = *maskp = 0;
return (0);
}
-#endif /* !WIN32 && !MSDOS */
+#endif /* !_WIN32 && !MSDOS */
projects / libpcap / blobdiff