xref: /titanic_41/usr/src/lib/libsmbfs/smb/getaddr.c (revision e18306b13ed357bd545696aa96b53617b64db4a3)
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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
24  */
25 
26 /*
27  * Functions to get list of addresses (TCP and/or NetBIOS)
28  */
29 
30 #include <errno.h>
31 #include <stdio.h>
32 #include <stdlib.h>
33 #include <string.h>
34 #include <strings.h>
35 #include <unistd.h>
36 #include <netdb.h>
37 #include <libintl.h>
38 #include <xti.h>
39 #include <assert.h>
40 
41 #include <sys/types.h>
42 #include <sys/time.h>
43 #include <sys/byteorder.h>
44 #include <sys/socket.h>
45 #include <sys/fcntl.h>
46 
47 #include <netinet/in.h>
48 #include <netinet/tcp.h>
49 #include <arpa/inet.h>
50 
51 #include <netsmb/smb.h>
52 #include <netsmb/smb_lib.h>
53 #include <netsmb/netbios.h>
54 #include <netsmb/nb_lib.h>
55 #include <netsmb/smb_dev.h>
56 
57 #include "charsets.h"
58 #include "private.h"
59 
60 void
61 dump_addrinfo(struct addrinfo *ai)
62 {
63 	int i;
64 
65 	if (ai == NULL) {
66 		printf("ai==NULL\n");
67 		return;
68 	}
69 
70 	for (i = 0; ai; i++, ai = ai->ai_next) {
71 		printf("ai[%d]: af=%d, len=%d", i,
72 		    ai->ai_family, ai->ai_addrlen);
73 		dump_sockaddr(ai->ai_addr);
74 		if (ai->ai_canonname) {
75 			printf("ai[%d]: cname=\"%s\"\n",
76 			    i, ai->ai_canonname);
77 		}
78 	}
79 }
80 
81 void
82 dump_sockaddr(struct sockaddr *sa)
83 {
84 	char paddrbuf[INET6_ADDRSTRLEN];
85 	struct sockaddr_in *sin;
86 	struct sockaddr_in6 *sin6;
87 	int af = sa->sa_family;
88 	const char *ip;
89 
90 	printf(" saf=%d,", af);
91 	switch (af) {
92 	case AF_NETBIOS: /* see nbns_rq.c */
93 	case AF_INET:
94 		sin = (void *)sa;
95 		ip = inet_ntop(AF_INET, &sin->sin_addr,
96 		    paddrbuf, sizeof (paddrbuf));
97 		break;
98 	case AF_INET6:
99 		sin6 = (void *)sa;
100 		ip = inet_ntop(AF_INET6, &sin6->sin6_addr,
101 		    paddrbuf, sizeof (paddrbuf));
102 		break;
103 	default:
104 		ip = "?";
105 		break;
106 	}
107 	printf(" IP=%s\n", ip);
108 }
109 
110 
111 /*
112  * SMB client name resolution - normal, and/or NetBIOS.
113  * Returns an EAI_xxx error number like getaddrinfo(3)
114  */
115 int
116 smb_ctx_getaddr(struct smb_ctx *ctx)
117 {
118 	struct nb_ctx	*nbc = ctx->ct_nb;
119 	struct addrinfo hints, *res;
120 	char *srvaddr_str;
121 	int gaierr, gaierr2;
122 
123 	if (ctx->ct_fullserver == NULL || ctx->ct_fullserver[0] == '\0')
124 		return (EAI_NONAME);
125 
126 	if (ctx->ct_addrinfo != NULL) {
127 		freeaddrinfo(ctx->ct_addrinfo);
128 		ctx->ct_addrinfo = NULL;
129 	}
130 
131 	/*
132 	 * If the user specified an address, use it,
133 	 * and don't do NetBIOS lookup.
134 	 */
135 	if (ctx->ct_srvaddr_s) {
136 		srvaddr_str = ctx->ct_srvaddr_s;
137 		nbc->nb_flags &= ~NBCF_NS_ENABLE;
138 	} else
139 		srvaddr_str = ctx->ct_fullserver;
140 
141 	/*
142 	 * Default the server name we'll use in the
143 	 * protocol (i.e. NTLM, tree connect).
144 	 */
145 	strlcpy(ctx->ct_srvname, ctx->ct_fullserver,
146 	    sizeof (ctx->ct_srvname));
147 
148 	/*
149 	 * Try to lookup the host address using the
150 	 * normal name-to-IP address mechanisms.
151 	 * If that fails, we MAY try NetBIOS.
152 	 */
153 	memset(&hints, 0, sizeof (hints));
154 	hints.ai_flags = AI_CANONNAME;
155 	hints.ai_family = PF_UNSPEC;
156 	hints.ai_socktype = SOCK_STREAM;
157 	gaierr = getaddrinfo(srvaddr_str, NULL, &hints, &res);
158 	if (gaierr == 0) {
159 		ctx->ct_addrinfo = res;
160 		return (0);
161 	}
162 
163 	/*
164 	 * If regular IP name lookup failed, try NetBIOS,
165 	 * but only if given a valid NetBIOS name and if
166 	 * NetBIOS name lookup is enabled.
167 	 */
168 	if (nbc->nb_flags & NBCF_NS_ENABLE) {
169 		gaierr2 = nbns_getaddrinfo(ctx->ct_fullserver, nbc, &res);
170 		if (gaierr2 == 0) {
171 			if (res->ai_canonname)
172 				strlcpy(ctx->ct_srvname,
173 				    res->ai_canonname,
174 				    sizeof (ctx->ct_srvname));
175 			ctx->ct_addrinfo = res;
176 			return (0);
177 		}
178 	}
179 
180 	/*
181 	 * Return the original error from getaddrinfo
182 	 */
183 	if (smb_verbose) {
184 		smb_error(dgettext(TEXT_DOMAIN,
185 		    "getaddrinfo: %s: %s"), 0,
186 		    ctx->ct_fullserver,
187 		    gai_strerror(gaierr));
188 	}
189 	return (gaierr);
190 }
191