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 #include <stdio.h> 28 #include <string.h> 29 #include <sys/types.h> 30 #include <sys/socket.h> 31 #include <net/if.h> 32 #include <sys/stropts.h> 33 #include <sys/sysmacros.h> 34 #include <netinet/in_systm.h> 35 #include <netinet/in.h> 36 #include <netinet/ip.h> 37 #include <netinet/igmp.h> 38 #include <inet/ip.h> 39 #include <arpa/inet.h> 40 #include <netdb.h> 41 #include "snoop.h" 42 43 static void interpret_igmpv3qry(struct igmp *, int); 44 static void interpret_igmpv3rpt(struct igmp *, int); 45 46 47 /*ARGSUSED*/ 48 void 49 interpret_igmp(int flags, char *data, int iplen, int ilen) 50 { 51 const char *pt; 52 char *line; 53 struct igmp *igmp = (struct igmp *)data; 54 char addrstr[INET_ADDRSTRLEN]; 55 56 if (ilen < IGMP_MINLEN) { 57 /* incomplete header */ 58 line = get_sum_line(); 59 (void) snprintf(line, MAXLINE, "Malformed IGMP packet"); 60 return; 61 } 62 63 switch (igmp->igmp_type) { 64 case IGMP_MEMBERSHIP_QUERY: 65 if (ilen == IGMP_MINLEN) { 66 if (igmp->igmp_code == 0) 67 pt = "v1 membership query"; 68 else 69 pt = "v2 membership query"; 70 } else if (ilen >= IGMP_V3_QUERY_MINLEN) { 71 pt = "v3 membership query"; 72 } else { 73 pt = "Unknown membership query"; 74 } 75 break; 76 case IGMP_V1_MEMBERSHIP_REPORT: 77 pt = "v1 membership report"; 78 break; 79 case IGMP_V2_MEMBERSHIP_REPORT: 80 pt = "v2 membership report"; 81 break; 82 case IGMP_V3_MEMBERSHIP_REPORT: 83 pt = "v3 membership report"; 84 break; 85 case IGMP_V2_LEAVE_GROUP: 86 pt = "v2 leave group"; 87 break; 88 89 default: 90 pt = "Unknown"; 91 break; 92 } 93 94 if (flags & F_SUM) { 95 line = get_sum_line(); 96 (void) snprintf(line, MAXLINE, "IGMP %s", pt); 97 } 98 99 if (flags & F_DTAIL) { 100 show_header("IGMP: ", "IGMP Header", ilen); 101 show_space(); 102 (void) snprintf(get_line(0, 0), get_line_remain(), 103 "Type = %d (%s)", igmp->igmp_type, pt); 104 (void) snprintf(get_line(0, 0), get_line_remain(), 105 "Max Response Time = %d", igmp->igmp_code); 106 (void) snprintf(get_line(0, 0), get_line_remain(), 107 "Checksum = %x", ntohs(igmp->igmp_cksum)); 108 109 if (igmp->igmp_type == IGMP_MEMBERSHIP_QUERY && 110 ilen >= IGMP_V3_QUERY_MINLEN) { 111 interpret_igmpv3qry(igmp, ilen); 112 } else if (igmp->igmp_type == IGMP_V3_MEMBERSHIP_REPORT) { 113 interpret_igmpv3rpt(igmp, ilen); 114 } else { 115 (void) snprintf(get_line(0, 0), get_line_remain(), 116 "Group = %s", 117 inet_ntop(AF_INET, &igmp->igmp_group.s_addr, 118 addrstr, INET_ADDRSTRLEN)); 119 } 120 121 show_space(); 122 } 123 } 124 125 static void 126 interpret_igmpv3qry(struct igmp *igmp, int ilen) 127 { 128 struct igmp3q *qry; 129 struct in_addr *src; 130 int rem = ilen; 131 int srccnt; 132 char addrstr[INET_ADDRSTRLEN]; 133 134 if (ilen < sizeof (*qry)) { 135 (void) snprintf(get_line(0, 0), get_line_remain(), 136 "Malformed IGMP Query"); 137 return; 138 } 139 140 qry = (struct igmp3q *)igmp; 141 rem -= sizeof (*qry); 142 srccnt = ntohs(qry->igmp3q_numsrc); 143 (void) snprintf(get_line(0, 0), get_line_remain(), 144 "Group = %s", inet_ntop(AF_INET, &qry->igmp3q_group, addrstr, 145 INET_ADDRSTRLEN)); 146 (void) snprintf(get_line(0, 0), get_line_remain(), 147 "%d Source Address%s:", srccnt, (srccnt == 1) ? "" : "es"); 148 149 src = (struct in_addr *)&qry[1]; 150 while (srccnt > 0 && rem >= sizeof (*src)) { 151 rem -= sizeof (*src); 152 153 (void) snprintf(get_line(0, 0), get_line_remain(), " %s", 154 inet_ntop(AF_INET, &src->s_addr, addrstr, INET_ADDRSTRLEN)); 155 156 srccnt--; 157 src++; 158 } 159 } 160 161 #define MAX_IGMPV3_REPORT_TYPE 6 162 163 const char *igmpv3rpt_types[] = { 164 "<unknown>", 165 "MODE_IS_INCLUDE", 166 "MODE_IS_EXCLUDE", 167 "CHANGE_TO_INCLUDE", 168 "CHANGE_TO_EXCLUDE", 169 "ALLOW_NEW_SOURCES", 170 "BLOCK_OLD_SOURCES", 171 }; 172 173 static void 174 interpret_igmpv3rpt(struct igmp *igmp, int ilen) 175 { 176 struct igmp3r *rpt; 177 struct grphdr *grh; 178 struct in_addr *src; 179 int rem = ilen, auxlen; 180 uint16_t grhcnt, srccnt; 181 char addrstr[INET_ADDRSTRLEN]; 182 183 if (ilen < sizeof (*rpt)) { 184 (void) snprintf(get_line(0, 0), get_line_remain(), 185 "Malformed IGMPv3 Report"); 186 return; 187 } 188 189 rpt = (struct igmp3r *)igmp; 190 grh = (struct grphdr *)&rpt[1]; 191 grhcnt = ntohs(rpt->igmp3r_numrec); 192 (void) snprintf(get_line(0, 0), get_line_remain(), 193 "%d Group Record%s:", grhcnt, (grhcnt == 1) ? "" : "s"); 194 rem -= sizeof (*rpt); 195 while (grhcnt > 0 && rem >= sizeof (*grh)) { 196 rem -= sizeof (*grh); 197 198 (void) snprintf(get_line(0, 0), get_line_remain(), 199 "Group = %s type = %s", inet_ntop(AF_INET, 200 &grh->grphdr_group.s_addr, addrstr, INET_ADDRSTRLEN), 201 (grh->grphdr_type > MAX_IGMPV3_REPORT_TYPE) ? 202 "<unknown>" : igmpv3rpt_types[grh->grphdr_type]); 203 srccnt = ntohs(grh->grphdr_numsrc); 204 (void) snprintf(get_line(0, 0), get_line_remain(), 205 "%d Source Address%s:", srccnt, (srccnt == 1) ? "" : "es"); 206 207 src = (struct in_addr *)&grh[1]; 208 while (srccnt > 0 && rem >= sizeof (*src)) { 209 rem -= sizeof (*src); 210 211 (void) snprintf(get_line(0, 0), get_line_remain(), 212 " %s", inet_ntop(AF_INET, &src->s_addr, addrstr, 213 INET_ADDRSTRLEN)); 214 215 srccnt--; 216 src++; 217 } 218 219 grhcnt--; 220 auxlen = grh->grphdr_auxlen * 4; 221 rem -= auxlen; 222 grh = (struct grphdr *)((uint8_t *)src + auxlen); 223 } 224 } 225