141 lines
4.3 KiB
Diff
141 lines
4.3 KiB
Diff
--- a/pcap-int.h
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+++ b/pcap-int.h
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@@ -209,6 +209,7 @@ struct pcap_opt {
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char *source;
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int promisc;
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int rfmon;
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+ int proto; /* protocol for packet socket (linux) */
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};
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/*
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--- a/pcap-linux.c
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+++ b/pcap-linux.c
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@@ -335,7 +335,7 @@ static int iface_get_id(int fd, const ch
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static int iface_get_mtu(int fd, const char *device, char *ebuf);
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static int iface_get_arptype(int fd, const char *device, char *ebuf);
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#ifdef HAVE_PF_PACKET_SOCKETS
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-static int iface_bind(int fd, int ifindex, char *ebuf);
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+static int iface_bind(int fd, int ifindex, char *ebuf, unsigned short proto);
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#ifdef IW_MODE_MONITOR
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static int has_wext(int sock_fd, const char *device, char *ebuf);
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#endif /* IW_MODE_MONITOR */
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@@ -881,7 +881,7 @@ pcap_can_set_rfmon_linux(pcap_t *handle)
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* (We assume that if we have Wireless Extensions support
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* we also have PF_PACKET support.)
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*/
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- sock_fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
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+ sock_fd = socket(PF_PACKET, SOCK_RAW, p->opt.proto);
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if (sock_fd == -1) {
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(void)snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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@@ -1128,6 +1128,9 @@ pcap_activate_linux(pcap_t *handle)
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handle->read_op = pcap_read_linux;
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handle->stats_op = pcap_stats_linux;
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+ if (handle->opt.proto < 0)
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+ handle->opt.proto = (int) htons(ETH_P_ALL);
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+
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/*
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* The "any" device is a special device which causes us not
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* to bind to a particular device and thus to look at all
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@@ -2684,8 +2687,8 @@ activate_new(pcap_t *handle)
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* try a SOCK_RAW socket for the raw interface.
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*/
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sock_fd = is_any_device ?
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- socket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_ALL)) :
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- socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
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+ socket(PF_PACKET, SOCK_DGRAM, handle->opt.proto) :
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+ socket(PF_PACKET, SOCK_RAW, handle->opt.proto);
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if (sock_fd == -1) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE, "socket: %s",
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@@ -2783,7 +2786,7 @@ activate_new(pcap_t *handle)
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return PCAP_ERROR;
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}
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sock_fd = socket(PF_PACKET, SOCK_DGRAM,
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- htons(ETH_P_ALL));
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+ handle->opt.proto);
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if (sock_fd == -1) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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@@ -2835,7 +2838,7 @@ activate_new(pcap_t *handle)
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}
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if ((err = iface_bind(sock_fd, handle->md.ifindex,
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- handle->errbuf)) != 1) {
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+ handle->errbuf, handle->opt.proto)) != 1) {
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close(sock_fd);
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if (err < 0)
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return err;
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@@ -3640,7 +3643,7 @@ iface_get_id(int fd, const char *device,
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* or a PCAP_ERROR_ value on a hard error.
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*/
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static int
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-iface_bind(int fd, int ifindex, char *ebuf)
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+iface_bind(int fd, int ifindex, char *ebuf, unsigned short proto)
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{
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struct sockaddr_ll sll;
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int err;
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@@ -3649,7 +3652,7 @@ iface_bind(int fd, int ifindex, char *eb
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memset(&sll, 0, sizeof(sll));
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sll.sll_family = AF_PACKET;
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sll.sll_ifindex = ifindex;
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- sll.sll_protocol = htons(ETH_P_ALL);
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+ sll.sll_protocol = proto;
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if (bind(fd, (struct sockaddr *) &sll, sizeof(sll)) == -1) {
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if (errno == ENETDOWN) {
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@@ -4359,7 +4362,7 @@ activate_old(pcap_t *handle)
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/* Open the socket */
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- handle->fd = socket(PF_INET, SOCK_PACKET, htons(ETH_P_ALL));
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+ handle->fd = socket(PF_INET, SOCK_PACKET, handle->opt.proto);
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if (handle->fd == -1) {
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snprintf(handle->errbuf, PCAP_ERRBUF_SIZE,
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"socket: %s", pcap_strerror(errno));
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--- a/pcap.c
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+++ b/pcap.c
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@@ -258,6 +258,8 @@ pcap_create_common(const char *source, c
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pcap_set_snaplen(p, 65535); /* max packet size */
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p->opt.promisc = 0;
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p->opt.buffer_size = 0;
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+ p->opt.proto = -1;
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+
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return (p);
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}
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@@ -318,6 +320,15 @@ pcap_set_buffer_size(pcap_t *p, int buff
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}
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int
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+pcap_set_protocol(pcap_t *p, unsigned short proto)
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+{
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+ if (pcap_check_activated(p))
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+ return PCAP_ERROR_ACTIVATED;
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+ p->opt.proto = proto;
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+ return 0;
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+}
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+
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+int
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pcap_activate(pcap_t *p)
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{
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int status;
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--- a/pcap/pcap.h
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+++ b/pcap/pcap.h
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@@ -68,6 +68,7 @@ extern "C" {
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#define PCAP_VERSION_MINOR 4
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#define PCAP_ERRBUF_SIZE 256
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+#define HAS_PROTO_EXTENSION
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/*
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* Compatibility for systems that have a bpf.h that
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@@ -276,6 +277,7 @@ int pcap_can_set_rfmon(pcap_t *);
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int pcap_set_rfmon(pcap_t *, int);
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int pcap_set_timeout(pcap_t *, int);
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int pcap_set_buffer_size(pcap_t *, int);
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+int pcap_set_protocol(pcap_t *, unsigned short);
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int pcap_activate(pcap_t *);
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pcap_t *pcap_open_live(const char *, int, int, int, char *);
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