1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 #include <stdio.h> 30 #include <string.h> 31 #include <sys/types.h> 32 #include <sys/socket.h> 33 #include <net/if.h> 34 #include <sys/stropts.h> 35 #include <sys/sysmacros.h> 36 #include <netinet/in_systm.h> 37 #include <netinet/in.h> 38 #include <netinet/ip.h> 39 #include <netinet/igmp.h> 40 #include <inet/ip.h> 41 #include <arpa/inet.h> 42 #include <netdb.h> 43 #include "snoop.h" 44 45 static void interpret_igmpv3qry(struct igmp *, int); 46 static void interpret_igmpv3rpt(struct igmp *, int); 47 48 49 /*ARGSUSED*/ 50 void 51 interpret_igmp(int flags, char *data, int iplen, int ilen) 52 { 53 const char *pt; 54 char *line; 55 struct igmp *igmp = (struct igmp *)data; 56 char addrstr[INET_ADDRSTRLEN]; 57 58 if (ilen < IGMP_MINLEN) { 59 /* incomplete header */ 60 line = get_sum_line(); 61 (void) snprintf(line, MAXLINE, "Malformed IGMP packet"); 62 return; 63 } 64 65 switch (igmp->igmp_type) { 66 case IGMP_MEMBERSHIP_QUERY: 67 if (ilen == IGMP_MINLEN) { 68 if (igmp->igmp_code == 0) 69 pt = "v1 membership query"; 70 else 71 pt = "v2 membership query"; 72 } else if (ilen >= IGMP_V3_QUERY_MINLEN) { 73 pt = "v3 membership query"; 74 } else { 75 pt = "Unknown membership query"; 76 } 77 break; 78 case IGMP_V1_MEMBERSHIP_REPORT: 79 pt = "v1 membership report"; 80 break; 81 case IGMP_V2_MEMBERSHIP_REPORT: 82 pt = "v2 membership report"; 83 break; 84 case IGMP_V3_MEMBERSHIP_REPORT: 85 pt = "v3 membership report"; 86 break; 87 case IGMP_V2_LEAVE_GROUP: 88 pt = "v2 leave group"; 89 break; 90 91 default: 92 pt = "Unknown"; 93 break; 94 } 95 96 if (flags & F_SUM) { 97 line = get_sum_line(); 98 (void) snprintf(line, MAXLINE, "IGMP %s", pt); 99 } 100 101 if (flags & F_DTAIL) { 102 show_header("IGMP: ", "IGMP Header", ilen); 103 show_space(); 104 (void) snprintf(get_line(0, 0), get_line_remain(), 105 "Type = %d (%s)", igmp->igmp_type, pt); 106 (void) snprintf(get_line(0, 0), get_line_remain(), 107 "Max Response Time = %d", igmp->igmp_code); 108 (void) snprintf(get_line(0, 0), get_line_remain(), 109 "Checksum = %x", ntohs(igmp->igmp_cksum)); 110 111 if (igmp->igmp_type == IGMP_MEMBERSHIP_QUERY && 112 ilen >= IGMP_V3_QUERY_MINLEN) { 113 interpret_igmpv3qry(igmp, ilen); 114 } else if (igmp->igmp_type == IGMP_V3_MEMBERSHIP_REPORT) { 115 interpret_igmpv3rpt(igmp, ilen); 116 } else { 117 (void) snprintf(get_line(0, 0), get_line_remain(), 118 "Group = %s", 119 inet_ntop(AF_INET, &igmp->igmp_group.s_addr, 120 addrstr, INET_ADDRSTRLEN)); 121 } 122 123 show_space(); 124 } 125 } 126 127 static void 128 interpret_igmpv3qry(struct igmp *igmp, int ilen) 129 { 130 struct igmp3q *qry; 131 struct in_addr *src; 132 int rem = ilen; 133 int srccnt; 134 char addrstr[INET_ADDRSTRLEN]; 135 136 if (ilen < sizeof (*qry)) { 137 (void) snprintf(get_line(0, 0), get_line_remain(), 138 "Malformed IGMP Query"); 139 return; 140 } 141 142 qry = (struct igmp3q *)igmp; 143 rem -= sizeof (*qry); 144 srccnt = ntohs(qry->igmp3q_numsrc); 145 (void) snprintf(get_line(0, 0), get_line_remain(), 146 "Group = %s", inet_ntop(AF_INET, &qry->igmp3q_group, addrstr, 147 INET_ADDRSTRLEN)); 148 (void) snprintf(get_line(0, 0), get_line_remain(), 149 "%d Source Address%s:", srccnt, (srccnt == 1) ? "" : "es"); 150 151 src = (struct in_addr *)&qry[1]; 152 while (srccnt > 0 && rem >= sizeof (*src)) { 153 rem -= sizeof (*src); 154 155 (void) snprintf(get_line(0, 0), get_line_remain(), " %s", 156 inet_ntop(AF_INET, &src->s_addr, addrstr, INET_ADDRSTRLEN)); 157 158 srccnt--; 159 src++; 160 } 161 } 162 163 #define MAX_IGMPV3_REPORT_TYPE 6 164 165 const char *igmpv3rpt_types[] = { 166 "<unknown>", 167 "MODE_IS_INCLUDE", 168 "MODE_IS_EXCLUDE", 169 "CHANGE_TO_INCLUDE", 170 "CHANGE_TO_EXCLUDE", 171 "ALLOW_NEW_SOURCES", 172 "BLOCK_OLD_SOURCES", 173 }; 174 175 static void 176 interpret_igmpv3rpt(struct igmp *igmp, int ilen) 177 { 178 struct igmp3r *rpt; 179 struct grphdr *grh; 180 struct in_addr *src; 181 int rem = ilen, auxlen; 182 uint16_t grhcnt, srccnt; 183 char addrstr[INET_ADDRSTRLEN]; 184 185 if (ilen < sizeof (*rpt)) { 186 (void) snprintf(get_line(0, 0), get_line_remain(), 187 "Malformed IGMPv3 Report"); 188 return; 189 } 190 191 rpt = (struct igmp3r *)igmp; 192 grh = (struct grphdr *)&rpt[1]; 193 grhcnt = ntohs(rpt->igmp3r_numrec); 194 (void) snprintf(get_line(0, 0), get_line_remain(), 195 "%d Group Record%s:", grhcnt, (grhcnt == 1) ? "" : "s"); 196 rem -= sizeof (*rpt); 197 while (grhcnt > 0 && rem >= sizeof (*grh)) { 198 rem -= sizeof (*grh); 199 200 (void) snprintf(get_line(0, 0), get_line_remain(), 201 "Group = %s type = %s", inet_ntop(AF_INET, 202 &grh->grphdr_group.s_addr, addrstr, INET_ADDRSTRLEN), 203 (grh->grphdr_type > MAX_IGMPV3_REPORT_TYPE) ? 204 "<unknown>" : igmpv3rpt_types[grh->grphdr_type]); 205 srccnt = ntohs(grh->grphdr_numsrc); 206 (void) snprintf(get_line(0, 0), get_line_remain(), 207 "%d Source Address%s:", srccnt, (srccnt == 1) ? "" : "es"); 208 209 src = (struct in_addr *)&grh[1]; 210 while (srccnt > 0 && rem >= sizeof (*src)) { 211 rem -= sizeof (*src); 212 213 (void) snprintf(get_line(0, 0), get_line_remain(), 214 " %s", inet_ntop(AF_INET, &src->s_addr, addrstr, 215 INET_ADDRSTRLEN)); 216 217 srccnt--; 218 src++; 219 } 220 221 grhcnt--; 222 auxlen = grh->grphdr_auxlen * 4; 223 rem -= auxlen; 224 grh = (struct grphdr *)((uint8_t *)src + auxlen); 225 } 226 } 227