X-Git-Url: https://git.tcpdump.org/tcpdump/blobdiff_plain/6389dc2f6f2916a880935d3eb3ccbaa6a2e71673..10ac80fdecfa9b9b7d259d8f50d0b72ef1b18f12:/print-igmp.c diff --git a/print-igmp.c b/print-igmp.c index 59560df5..914e3d6b 100644 --- a/print-igmp.c +++ b/print-igmp.c @@ -19,64 +19,60 @@ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. */ -#ifndef lint -static const char rcsid[] = - "@(#) $Header: /tcpdump/master/tcpdump/print-igmp.c,v 1.2 2000-11-02 18:02:52 fenner Exp $ (LBL)"; -#endif +/* \summary: Internet Group Management Protocol (IGMP) printer */ + +/* + * specification: + * + * RFC 2236 for IGMPv2 + * RFC 3376 for IGMPv3 + * draft-asaeda-mboned-mtrace-v2 for the mtrace message + */ #ifdef HAVE_CONFIG_H -#include "config.h" +#include #endif -#include -#include - -#include -#include -#include +#include "netdissect-stdinc.h" -#include -#include - -#include "interface.h" +#include "netdissect.h" #include "addrtoname.h" -#include "extract.h" /* must come after interface.h */ +#include "extract.h" #ifndef IN_CLASSD #define IN_CLASSD(i) (((int32_t)(i) & 0xf0000000) == 0xe0000000) #endif + /* (following from ipmulti/mrouted/prune.h) */ /* * The packet format for a traceroute request. */ struct tr_query { - u_int tr_src; /* traceroute source */ - u_int tr_dst; /* traceroute destination */ - u_int tr_raddr; /* traceroute response address */ - u_int tr_rttlqid; /* response ttl and qid */ + nd_uint32_t tr_src; /* traceroute source */ + nd_uint32_t tr_dst; /* traceroute destination */ + nd_uint32_t tr_raddr; /* traceroute response address */ + nd_uint8_t tr_rttl; /* response ttl */ + nd_uint24_t tr_qid; /* qid */ }; -#define TR_GETTTL(x) (int)(((x) >> 24) & 0xff) -#define TR_GETQID(x) ((x) & 0x00ffffff) - /* * Traceroute response format. A traceroute response has a tr_query at the * beginning, followed by one tr_resp for each hop taken. */ struct tr_resp { - u_int tr_qarr; /* query arrival time */ - u_int tr_inaddr; /* incoming interface address */ - u_int tr_outaddr; /* outgoing interface address */ - u_int tr_rmtaddr; /* parent address in source tree */ - u_int tr_vifin; /* input packet count on interface */ - u_int tr_vifout; /* output packet count on interface */ - u_int tr_pktcnt; /* total incoming packets for src-grp */ - u_char tr_rproto; /* routing proto deployed on router */ - u_char tr_fttl; /* ttl required to forward on outvif */ - u_char tr_smask; /* subnet mask for src addr */ - u_char tr_rflags; /* forwarding error codes */ + nd_uint32_t tr_qarr; /* query arrival time */ + nd_uint32_t tr_inaddr; /* incoming interface address */ + nd_uint32_t tr_outaddr; /* outgoing interface address */ + nd_uint32_t tr_rmtaddr; /* parent address in source tree */ + nd_uint32_t tr_vifin; /* input packet count on interface */ + nd_uint32_t tr_vifout; /* output packet count on interface */ + nd_uint32_t tr_pktcnt; /* total incoming packets for src-grp */ + nd_uint8_t tr_rproto; /* routing proto deployed on router */ + nd_uint8_t tr_fttl; /* ttl required to forward on outvif */ + nd_uint8_t tr_smask; /* subnet mask for src addr */ + nd_uint8_t tr_rflags; /* forwarding error codes */ }; /* defs within mtrace */ @@ -101,7 +97,7 @@ struct tr_resp { #define TR_PROTO_CBT 4 /* igmpv3 report types */ -static struct tok igmpv3report2str[] = { +static const struct tok igmpv3report2str[] = { { 1, "is_in" }, { 2, "is_ex" }, { 3, "to_in" }, @@ -111,204 +107,195 @@ static struct tok igmpv3report2str[] = { { 0, NULL } }; -static void -print_mtrace(register const u_char *bp, register u_int len) -{ - register struct tr_query *tr = (struct tr_query *)(bp + 8); - - printf("mtrace %lu: %s to %s reply-to %s", - (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)), - ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), - ipaddr_string(&tr->tr_raddr)); - if (IN_CLASSD(ntohl(tr->tr_raddr))) - printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid))); -} - -static void -print_mresp(register const u_char *bp, register u_int len) +static void +print_mtrace(netdissect_options *ndo, + const char *typename, + const u_char *bp, u_int len) { - register struct tr_query *tr = (struct tr_query *)(bp + 8); + const struct tr_query *tr = (const struct tr_query *)(bp + 8); - printf("mresp %lu: %s to %s reply-to %s", - (u_long)TR_GETQID(ntohl(tr->tr_rttlqid)), - ipaddr_string(&tr->tr_src), ipaddr_string(&tr->tr_dst), - ipaddr_string(&tr->tr_raddr)); - if (IN_CLASSD(ntohl(tr->tr_raddr))) - printf(" with-ttl %d", TR_GETTTL(ntohl(tr->tr_rttlqid))); + if (len < 8 + sizeof (struct tr_query)) { + ND_PRINT(" [invalid len %u]", len); + return; + } + ND_PRINT("%s %u: %s to %s reply-to %s", + typename, + GET_BE_U_3(tr->tr_qid), + GET_IPADDR_STRING(tr->tr_src), GET_IPADDR_STRING(tr->tr_dst), + GET_IPADDR_STRING(tr->tr_raddr)); + if (IN_CLASSD(GET_BE_U_4(tr->tr_raddr))) + ND_PRINT(" with-ttl %u", GET_U_1(tr->tr_rttl)); } -static void -print_igmpv3_report(register const u_char *bp, register u_int len, - register const u_char *bp2) +static void +print_igmpv3_report(netdissect_options *ndo, + const u_char *bp, u_int len) { - int group, nsrcs, ngroups; - register int i, j; + u_int group, nsrcs, ngroups; + u_int i, j; /* Minimum len is 16, and should be a multiple of 4 */ if (len < 16 || len & 0x03) { - (void)printf(" [invalid len %d]", len); - return; + ND_PRINT(" [invalid len %u]", len); + return; } - TCHECK2(bp[6], 2); - ngroups = EXTRACT_16BITS(&bp[6]); - (void)printf(", %d group record(s)", ngroups); - if (vflag > 0) { + ngroups = GET_BE_U_2(bp + 6); + ND_PRINT(", %u group record(s)", ngroups); + if (ndo->ndo_vflag > 0) { /* Print the group records */ - group = 8; + group = 8; for (i=0; indo_vflag == 1) + ND_PRINT(", %u source(s)", nsrcs); else { /* Print the sources */ - (void)printf(" {"); + ND_PRINT(" {"); for (j=0; j> 4) + 3); } - TCHECK2(bp[4], 4); - if (EXTRACT_32BITS(&bp[4]) == 0) + if (mrc != 100) { + ND_PRINT(" [max resp time "); + if (mrt < 600) { + ND_PRINT("%.1fs", mrt * 0.1); + } else { + unsigned_relts_print(ndo, mrt / 10); + } + ND_PRINT("]"); + } + if (GET_BE_U_4(bp + 4) == 0) return; - (void)printf(" [gaddr %s", ipaddr_string(&bp[4])); - TCHECK2(bp[10], 2); - nsrcs = EXTRACT_16BITS(&bp[10]); + ND_PRINT(" [gaddr %s", GET_IPADDR_STRING(bp + 4)); + nsrcs = GET_BE_U_2(bp + 10); if (nsrcs > 0) { if (len < 12 + (nsrcs << 2)) - (void)printf(" [invalid number of sources]"); - else if (vflag > 1) { - (void)printf(" {"); + ND_PRINT(" [invalid number of sources]"); + else if (ndo->ndo_vflag > 1) { + ND_PRINT(" {"); for (i=0; i %s: ", - ipaddr_string(&ip->ip_src), - ipaddr_string(&ip->ip_dst)); + struct cksum_vec vec[1]; - if (qflag) { - (void)printf("igmp"); + ndo->ndo_protocol = "igmp"; + if (ndo->ndo_qflag) { + ND_PRINT("igmp"); return; } - TCHECK2(bp[0], 8); - switch (bp[0]) { + switch (GET_U_1(bp)) { case 0x11: - (void)printf("igmp query"); + ND_PRINT("igmp query"); if (len >= 12) - print_igmpv3_query(bp, len, bp2); + print_igmpv3_query(ndo, bp, len); else { - if (bp[1]) { - (void)printf(" v2"); - if (bp[1] != 100) - (void)printf(" [max resp time %d]", bp[1]); + if (GET_U_1(bp + 1)) { + ND_PRINT(" v2"); + if (GET_U_1(bp + 1) != 100) + ND_PRINT(" [max resp time %u]", GET_U_1(bp + 1)); } else - (void)printf(" v1"); - if (EXTRACT_32BITS(&bp[4])) - (void)printf(" [gaddr %s]", ipaddr_string(&bp[4])); + ND_PRINT(" v1"); + if (GET_BE_U_4(bp + 4)) + ND_PRINT(" [gaddr %s]", GET_IPADDR_STRING(bp + 4)); if (len != 8) - (void)printf(" [len %d]", len); + ND_PRINT(" [len %u]", len); } break; case 0x12: - (void)printf("igmp v1 report %s", ipaddr_string(&bp[4])); + ND_PRINT("igmp v1 report %s", GET_IPADDR_STRING(bp + 4)); if (len != 8) - (void)printf(" [len %d]", len); + ND_PRINT(" [len %u]", len); break; case 0x16: - (void)printf("igmp v2 report %s", ipaddr_string(&bp[4])); + ND_PRINT("igmp v2 report %s", GET_IPADDR_STRING(bp + 4)); break; case 0x22: - (void)printf("igmp v3 report"); - print_igmpv3_report(bp, len, bp2); + ND_PRINT("igmp v3 report"); + print_igmpv3_report(ndo, bp, len); break; case 0x17: - (void)printf("igmp leave %s", ipaddr_string(&bp[4])); + ND_PRINT("igmp leave %s", GET_IPADDR_STRING(bp + 4)); break; case 0x13: - (void)printf("igmp dvmrp"); + ND_PRINT("igmp dvmrp"); if (len < 8) - (void)printf(" [len %d]", len); + ND_PRINT(" [len %u]", len); else - dvmrp_print(bp, len); + dvmrp_print(ndo, bp, len); break; case 0x14: - (void)printf("igmp pimv1"); - pimv1_print(bp, len); + ND_PRINT("igmp pimv1"); + pimv1_print(ndo, bp, len); break; case 0x1e: - print_mresp(bp, len); + print_mtrace(ndo, "mresp", bp, len); break; case 0x1f: - print_mtrace(bp, len); + print_mtrace(ndo, "mtrace", bp, len); break; default: - (void)printf("igmp-%d", bp[0]); + ND_PRINT("igmp-%u", GET_U_1(bp)); break; } - if (vflag && TTEST2(bp[0], len)) { + if (ndo->ndo_vflag && len >= 4 && ND_TTEST_LEN(bp, len)) { /* Check the IGMP checksum */ - if (in_cksum((const u_short*)bp, len, 0)) - printf(" bad igmp cksum %x!", EXTRACT_16BITS(&bp[2])); + vec[0].ptr = bp; + vec[0].len = len; + if (in_cksum(vec, 1)) + ND_PRINT(" bad igmp cksum %x!", GET_BE_U_2(bp + 2)); } - return; -trunc: - fputs("[|igmp]", stdout); }