171 lines
4.8 KiB
C
171 lines
4.8 KiB
C
# patch by obecian <obecian@openbsd.org>
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# verified by antirez and dugsong -- will be in next release
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--- getlhs.c.orig Sat Aug 19 21:41:20 2000
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+++ getlhs.c Sat Aug 19 21:43:54 2000
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@@ -16,137 +16,32 @@
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int get_linkhdr_size(char *ifname)
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{
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-/*
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- * PPP
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- */
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-
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-#ifdef OSTYPE_LINUX /* Linux */
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- if ( strstr(ifname, "ppp") )
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- {
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- linkhdr_size = PPPHDR_SIZE_LINUX;
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- return 0;
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- }
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-#endif
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-
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-#ifdef OSTYPE_FREEBSD /* FreeBSD */
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- if ( strstr(ifname, "ppp") )
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- {
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- linkhdr_size = PPPHDR_SIZE_FREEBSD;
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- return 0;
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- }
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-#endif
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-
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-#ifdef OSTYPE_OPENBSD /* OpenBSD */
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- if ( strstr(ifname, "ppp") )
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- {
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- linkhdr_size = PPPHDR_SIZE_OPENBSD;
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- return 0;
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- }
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-#endif
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-
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-#ifdef OSTYPE_NETBSD /* NetBSD */
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- if ( strstr(ifname, "ppp") )
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- {
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- linkhdr_size = PPPHDR_SIZE_NETBSD;
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- return 0;
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- }
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-#endif
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-
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-/* XXX: if you port hping2 to BSDI remember
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- * that PPPHDR_SIZE_BSDOS must be 24 for some
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- * BSDI versions (see libpcap for more information)
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- */
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-
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-/*
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- * Ethernet
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- */
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-
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-#ifdef OSTYPE_LINUX /* Linux */
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- else if ( strstr(ifname, "eth") )
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- {
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- linkhdr_size = ETHHDR_SIZE;
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- return 0;
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- }
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-#endif
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-
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-#ifdef OSTYPE_FREEBSD /* FreeBSD */
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- else if ( strstr(ifname, "eth") /* ? */
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- || strstr(ifname, "ed")
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- || strstr(ifname, "ne")
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- || strstr(ifname, "xl") /* 3com */
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- || strstr(ifname, "vx") /* 3com (older model) */
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- || strstr(ifname, "ep") /* 3com 3c589 */
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- || strstr(ifname, "fxp") /* Intel EtherExpress Pro/100B */
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- || strstr(ifname, "al") /* ADMtek Inc. AL981 "Comet" chip. */
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- || strstr(ifname, "de") /* Digital Equipment DC21040 */
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- || strstr(ifname, "mx") /* Macronix 98713, 987615 ans 98725 */
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- || strstr(ifname, "rl") /* RealTek 8129/8139 */
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- || strstr(ifname, "sf") /* Adaptec Duralink PCI */
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- || strstr(ifname, "sk") /* SysKonnect SK-984x */
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- || strstr(ifname, "tl") /* Compaq Netelligent 10/10+TNETE100 */
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- || strstr(ifname, "tx") /* SMC 9432TX */
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- || strstr(ifname, "wb")) /* Winbond W89C840F chip */
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- {
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- linkhdr_size = ETHHDR_SIZE;
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- return 0;
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- }
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-#endif
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-
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-#ifdef OSTYPE_OPENBSD /* OpenBSD FIXME: grepped from FreeBSD, it's OK? */
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- else if ( strstr(ifname, "eth") /* ? */
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- || strstr(ifname, "ed")
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- || strstr(ifname, "ne")
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- || strstr(ifname, "xl") /* 3com */
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- || strstr(ifname, "vx") /* 3com (older model) */
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- || strstr(ifname, "ep") /* 3com 3c589 */
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- || strstr(ifname, "fxp") /* Intel EtherExpress Pro/100B */
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- || strstr(ifname, "al") /* ADMtek Inc. AL981 "Comet" chip. */
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- || strstr(ifname, "de") /* Digital Equipment DC21040 */
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- || strstr(ifname, "mx") /* Macronix 98713, 987615 ans 98725 */
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- || strstr(ifname, "rl") /* RealTek 8129/8139 */
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- || strstr(ifname, "sf") /* Adaptec Duralink PCI */
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- || strstr(ifname, "sk") /* SysKonnect SK-984x */
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- || strstr(ifname, "tl") /* Compaq Netelligent 10/10+TNETE100 */
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- || strstr(ifname, "tx") /* SMC 9432TX */
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- || strstr(ifname, "wb")) /* Winbond W89C840F chip */
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- {
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- linkhdr_size = ETHHDR_SIZE;
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- return 0;
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- }
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-#endif
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-
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-#ifdef OSTYPE_NETBSD /* NetBSD FIXME: grepped from FreeBSD, it's OK? */
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- else if ( strstr(ifname, "eth") /* ? */
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- || strstr(ifname, "ed")
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- || strstr(ifname, "ne")
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- || strstr(ifname, "xl") /* 3com */
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- || strstr(ifname, "vx") /* 3com (older model) */
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- || strstr(ifname, "ep") /* 3com 3c589 */
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- || strstr(ifname, "fxp") /* Intel EtherExpress Pro/100B */
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- || strstr(ifname, "al") /* ADMtek Inc. AL981 "Comet" chip. */
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- || strstr(ifname, "de") /* Digital Equipment DC21040 */
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- || strstr(ifname, "mx") /* Macronix 98713, 987615 ans 98725 */
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- || strstr(ifname, "rl") /* RealTek 8129/8139 */
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- || strstr(ifname, "sf") /* Adaptec Duralink PCI */
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- || strstr(ifname, "sk") /* SysKonnect SK-984x */
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- || strstr(ifname, "tl") /* Compaq Netelligent 10/10+TNETE100 */
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- || strstr(ifname, "tx") /* SMC 9432TX */
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- || strstr(ifname, "wb")) /* Winbond W89C840F chip */
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- {
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- linkhdr_size = ETHHDR_SIZE;
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- return 0;
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- }
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-#endif
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-
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-/*
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- * Loopback
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- */
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-
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- else if ( strstr(ifname, "lo") )
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- {
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- linkhdr_size = LOHDR_SIZE;
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- return 0;
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- }
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- else
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+/* XXX - use pcap to identify header offset - obecian@celerity.bartoli.org */
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+pcap_t *tpd = NULL;
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+char errbuf[256];
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+int linktype;
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+
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+if ((tpd = pcap_open_live(ifname,0,0,0,errbuf)) == NULL)
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+{
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+ fprintf(stderr, "Error opening interface: %s\n", errbuf);
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+ exit(1);
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+}
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+linktype=pcap_datalink(tpd);
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+pcap_close(tpd);
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+
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+switch(linktype)
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+{
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+ case DLT_LOOP:
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+ case DLT_EN10MB: linkhdr_size = 14; break; /* also 100 */
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+ case DLT_NULL:
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+ case DLT_PPP: /* XXX - fix for Linux, i only have bsd - obecian */
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+ linkhdr_size = 4;
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+ break;
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+ default:
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+ fprintf(stderr, "Unsupported datalink type: %s\n",ifname);
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return -1;
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+ break;
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+}
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+
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+return 0;
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}
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