diff options
Diffstat (limited to 'pcap-bpf.c')
| -rw-r--r-- | pcap-bpf.c | 57 |
1 files changed, 56 insertions, 1 deletions
@@ -20,7 +20,7 @@ */ #ifndef lint static const char rcsid[] = - "@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.53 2002-10-08 07:18:08 guy Exp $ (LBL)"; + "@(#) $Header: /tcpdump/master/libpcap/pcap-bpf.c,v 1.54 2002-12-19 09:05:45 guy Exp $ (LBL)"; #endif #ifdef HAVE_CONFIG_H @@ -229,9 +229,16 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf) int fd; struct ifreq ifr; struct bpf_version bv; +#ifdef BIOCGDLTLIST + struct bpf_dltlist bdl; +#endif u_int v; pcap_t *p; +#ifdef BIOCGDLTLIST + bzero(&bdl, sizeof(bdl)); +#endif + p = (pcap_t *)malloc(sizeof(*p)); if (p == NULL) { snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", @@ -348,6 +355,37 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf) #endif p->linktype = v; +#ifdef BIOCGDLTLIST + /* + * We know the default link type -- now determine all the DLTs + * this interface supports. If this fails with EINVAL, it's + * not fatal; we just don't get to use the feature later. + */ + if (ioctl(fd, BIOCGDLTLIST, (caddr_t) &bdl) == 0) { + bdl.bfl_list = (u_int *) malloc(sizeof(u_int) * bdl.bfl_len); + if (bdl.bfl_list == NULL) { + (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, "malloc: %s", + pcap_strerror(errno)); + goto bad; + } + + if (ioctl(fd, BIOCGDLTLIST, (caddr_t) &bdl) < 0) { + (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, + "BIOCGDLTLIST: %s", pcap_strerror(errno)); + goto bad; + } + + p->dlt_count = bdl.bfl_len; + p->dlt_list = bdl.bfl_list; + } else { + if (errno != EINVAL) { + (void)snprintf(ebuf, PCAP_ERRBUF_SIZE, + "BIOCGDLTLIST: %s", pcap_strerror(errno)); + goto bad; + } + } +#endif + /* set timeout */ if (to_ms != 0) { /* @@ -446,6 +484,10 @@ pcap_open_live(char *device, int snaplen, int promisc, int to_ms, char *ebuf) return (p); bad: (void)close(fd); +#ifdef BIOCGDLTLIST + if (bdl.bfl_list != NULL) + free(bdl.bfl_list); +#endif free(p); return (NULL); } @@ -477,3 +519,16 @@ pcap_setfilter(pcap_t *p, struct bpf_program *fp) } return (0); } + +int +pcap_set_datalink_platform(pcap_t *p, int dlt) +{ +#ifdef BIOCSDLT + if (ioctl(p->fd, BIOCSDLT, &dlt) == -1) { + (void) snprintf(p->errbuf, sizeof(p->errbuf), + "Cannot set DLT %d: %s", dlt, strerror(errno)); + return (-1); + } +#endif + return (0); +} |