discovery.c revision 273543
1/*- 2 * Copyright (c) 2012 The FreeBSD Foundation 3 * All rights reserved. 4 * 5 * This software was developed by Edward Tomasz Napierala under sponsorship 6 * from the FreeBSD Foundation. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 */ 30 31#include <sys/cdefs.h> 32__FBSDID("$FreeBSD: head/usr.sbin/ctld/discovery.c 273543 2014-10-23 12:02:27Z trasz $"); 33 34#include <assert.h> 35#include <stdint.h> 36#include <stdio.h> 37#include <stdlib.h> 38#include <string.h> 39#include <netinet/in.h> 40#include <netdb.h> 41#include <sys/socket.h> 42 43#include "ctld.h" 44#include "iscsi_proto.h" 45 46static struct pdu * 47text_receive(struct connection *conn) 48{ 49 struct pdu *request; 50 struct iscsi_bhs_text_request *bhstr; 51 52 request = pdu_new(conn); 53 pdu_receive(request); 54 if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) != 55 ISCSI_BHS_OPCODE_TEXT_REQUEST) 56 log_errx(1, "protocol error: received invalid opcode 0x%x", 57 request->pdu_bhs->bhs_opcode); 58 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 59#if 0 60 if ((bhstr->bhstr_flags & ISCSI_BHSTR_FLAGS_FINAL) == 0) 61 log_errx(1, "received Text PDU without the \"F\" flag"); 62#endif 63 /* 64 * XXX: Implement the C flag some day. 65 */ 66 if ((bhstr->bhstr_flags & BHSTR_FLAGS_CONTINUE) != 0) 67 log_errx(1, "received Text PDU with unsupported \"C\" flag"); 68 if (ntohl(bhstr->bhstr_cmdsn) < conn->conn_cmdsn) { 69 log_errx(1, "received Text PDU with decreasing CmdSN: " 70 "was %d, is %d", conn->conn_cmdsn, ntohl(bhstr->bhstr_cmdsn)); 71 } 72 if (ntohl(bhstr->bhstr_expstatsn) != conn->conn_statsn) { 73 log_errx(1, "received Text PDU with wrong StatSN: " 74 "is %d, should be %d", ntohl(bhstr->bhstr_expstatsn), 75 conn->conn_statsn); 76 } 77 conn->conn_cmdsn = ntohl(bhstr->bhstr_cmdsn); 78 79 return (request); 80} 81 82static struct pdu * 83text_new_response(struct pdu *request) 84{ 85 struct pdu *response; 86 struct connection *conn; 87 struct iscsi_bhs_text_request *bhstr; 88 struct iscsi_bhs_text_response *bhstr2; 89 90 bhstr = (struct iscsi_bhs_text_request *)request->pdu_bhs; 91 conn = request->pdu_connection; 92 93 response = pdu_new_response(request); 94 bhstr2 = (struct iscsi_bhs_text_response *)response->pdu_bhs; 95 bhstr2->bhstr_opcode = ISCSI_BHS_OPCODE_TEXT_RESPONSE; 96 bhstr2->bhstr_flags = BHSTR_FLAGS_FINAL; 97 bhstr2->bhstr_lun = bhstr->bhstr_lun; 98 bhstr2->bhstr_initiator_task_tag = bhstr->bhstr_initiator_task_tag; 99 bhstr2->bhstr_target_transfer_tag = bhstr->bhstr_target_transfer_tag; 100 bhstr2->bhstr_statsn = htonl(conn->conn_statsn++); 101 bhstr2->bhstr_expcmdsn = htonl(conn->conn_cmdsn); 102 bhstr2->bhstr_maxcmdsn = htonl(conn->conn_cmdsn); 103 104 return (response); 105} 106 107static struct pdu * 108logout_receive(struct connection *conn) 109{ 110 struct pdu *request; 111 struct iscsi_bhs_logout_request *bhslr; 112 113 request = pdu_new(conn); 114 pdu_receive(request); 115 if ((request->pdu_bhs->bhs_opcode & ~ISCSI_BHS_OPCODE_IMMEDIATE) != 116 ISCSI_BHS_OPCODE_LOGOUT_REQUEST) 117 log_errx(1, "protocol error: received invalid opcode 0x%x", 118 request->pdu_bhs->bhs_opcode); 119 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 120 if ((bhslr->bhslr_reason & 0x7f) != BHSLR_REASON_CLOSE_SESSION) 121 log_debugx("received Logout PDU with invalid reason 0x%x; " 122 "continuing anyway", bhslr->bhslr_reason & 0x7f); 123 if (ntohl(bhslr->bhslr_cmdsn) < conn->conn_cmdsn) { 124 log_errx(1, "received Logout PDU with decreasing CmdSN: " 125 "was %d, is %d", conn->conn_cmdsn, 126 ntohl(bhslr->bhslr_cmdsn)); 127 } 128 if (ntohl(bhslr->bhslr_expstatsn) != conn->conn_statsn) { 129 log_errx(1, "received Logout PDU with wrong StatSN: " 130 "is %d, should be %d", ntohl(bhslr->bhslr_expstatsn), 131 conn->conn_statsn); 132 } 133 conn->conn_cmdsn = ntohl(bhslr->bhslr_cmdsn); 134 135 return (request); 136} 137 138static struct pdu * 139logout_new_response(struct pdu *request) 140{ 141 struct pdu *response; 142 struct connection *conn; 143 struct iscsi_bhs_logout_request *bhslr; 144 struct iscsi_bhs_logout_response *bhslr2; 145 146 bhslr = (struct iscsi_bhs_logout_request *)request->pdu_bhs; 147 conn = request->pdu_connection; 148 149 response = pdu_new_response(request); 150 bhslr2 = (struct iscsi_bhs_logout_response *)response->pdu_bhs; 151 bhslr2->bhslr_opcode = ISCSI_BHS_OPCODE_LOGOUT_RESPONSE; 152 bhslr2->bhslr_flags = 0x80; 153 bhslr2->bhslr_response = BHSLR_RESPONSE_CLOSED_SUCCESSFULLY; 154 bhslr2->bhslr_initiator_task_tag = bhslr->bhslr_initiator_task_tag; 155 bhslr2->bhslr_statsn = htonl(conn->conn_statsn++); 156 bhslr2->bhslr_expcmdsn = htonl(conn->conn_cmdsn); 157 bhslr2->bhslr_maxcmdsn = htonl(conn->conn_cmdsn); 158 159 return (response); 160} 161 162static void 163discovery_add_target(struct keys *response_keys, const struct target *targ) 164{ 165 struct portal *portal; 166 char *buf; 167 char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV]; 168 struct addrinfo *ai; 169 int ret; 170 171 keys_add(response_keys, "TargetName", targ->t_name); 172 TAILQ_FOREACH(portal, &targ->t_portal_group->pg_portals, p_next) { 173 ai = portal->p_ai; 174 ret = getnameinfo(ai->ai_addr, ai->ai_addrlen, 175 hbuf, sizeof(hbuf), sbuf, sizeof(sbuf), 176 NI_NUMERICHOST | NI_NUMERICSERV); 177 if (ret != 0) { 178 log_warnx("getnameinfo: %s", gai_strerror(ret)); 179 continue; 180 } 181 switch (ai->ai_addr->sa_family) { 182 case AF_INET: 183 if (strcmp(hbuf, "0.0.0.0") == 0) 184 continue; 185 ret = asprintf(&buf, "%s:%s,%d", hbuf, sbuf, 186 targ->t_portal_group->pg_tag); 187 break; 188 case AF_INET6: 189 if (strcmp(hbuf, "::") == 0) 190 continue; 191 ret = asprintf(&buf, "[%s]:%s,%d", hbuf, sbuf, 192 targ->t_portal_group->pg_tag); 193 break; 194 default: 195 continue; 196 } 197 if (ret <= 0) 198 log_err(1, "asprintf"); 199 keys_add(response_keys, "TargetAddress", buf); 200 free(buf); 201 } 202} 203 204void 205discovery(struct connection *conn) 206{ 207 struct pdu *request, *response; 208 struct keys *request_keys, *response_keys; 209 const struct portal_group *pg; 210 const struct target *targ; 211 const char *send_targets; 212 213 pg = conn->conn_portal->p_portal_group; 214 215 log_debugx("beginning discovery session; waiting for Text PDU"); 216 request = text_receive(conn); 217 request_keys = keys_new(); 218 keys_load(request_keys, request); 219 220 send_targets = keys_find(request_keys, "SendTargets"); 221 if (send_targets == NULL) 222 log_errx(1, "received Text PDU without SendTargets"); 223 224 response = text_new_response(request); 225 response_keys = keys_new(); 226 227 if (strcmp(send_targets, "All") == 0) { 228 TAILQ_FOREACH(targ, &pg->pg_conf->conf_targets, t_next) { 229 if (targ->t_portal_group != pg) { 230 log_debugx("not returning target \"%s\"; " 231 "belongs to a different portal group", 232 targ->t_name); 233 continue; 234 } 235 discovery_add_target(response_keys, targ); 236 } 237 } else { 238 targ = target_find(pg->pg_conf, send_targets); 239 if (targ == NULL) { 240 log_debugx("initiator requested information on unknown " 241 "target \"%s\"; returning nothing", send_targets); 242 } else 243 discovery_add_target(response_keys, targ); 244 } 245 keys_save(response_keys, response); 246 247 pdu_send(response); 248 pdu_delete(response); 249 keys_delete(response_keys); 250 pdu_delete(request); 251 keys_delete(request_keys); 252 253 log_debugx("done sending targets; waiting for Logout PDU"); 254 request = logout_receive(conn); 255 response = logout_new_response(request); 256 257 pdu_send(response); 258 pdu_delete(response); 259 pdu_delete(request); 260 261 log_debugx("discovery session done"); 262} 263