xref: /illumos-gate/usr/src/lib/libsmbfs/smb/getaddr.c (revision 40c0e2317898b8c774791bdc2b30bd50111ab1fa)
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  * Copyright 2018 Nexenta Systems, Inc.  All rights reserved.
25  */
26 
27 /*
28  * Functions to get list of addresses (TCP and/or NetBIOS)
29  */
30 
31 #include <errno.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <strings.h>
36 #include <unistd.h>
37 #include <netdb.h>
38 #include <libintl.h>
39 #include <xti.h>
40 #include <assert.h>
41 
42 #include <sys/types.h>
43 #include <sys/time.h>
44 #include <sys/byteorder.h>
45 #include <sys/socket.h>
46 #include <sys/fcntl.h>
47 
48 #include <netinet/in.h>
49 #include <netinet/tcp.h>
50 #include <arpa/inet.h>
51 
52 #include <netsmb/smb.h>
53 #include <netsmb/smb_lib.h>
54 #include <netsmb/netbios.h>
55 #include <netsmb/nb_lib.h>
56 #include <netsmb/smb_dev.h>
57 
58 #include "charsets.h"
59 #include "private.h"
60 
61 static char smb_port[16] = "445";
62 
63 void
dump_addrinfo(struct addrinfo * ai)64 dump_addrinfo(struct addrinfo *ai)
65 {
66 	int i;
67 
68 	if (ai == NULL) {
69 		printf("ai==NULL\n");
70 		return;
71 	}
72 
73 	for (i = 0; ai; i++, ai = ai->ai_next) {
74 		printf("ai[%d]: af=%d, len=%d", i,
75 		    ai->ai_family, ai->ai_addrlen);
76 		dump_sockaddr(ai->ai_addr);
77 		if (ai->ai_canonname) {
78 			printf("ai[%d]: cname=\"%s\"\n",
79 			    i, ai->ai_canonname);
80 		}
81 	}
82 }
83 
84 void
dump_sockaddr(struct sockaddr * sa)85 dump_sockaddr(struct sockaddr *sa)
86 {
87 	char paddrbuf[INET6_ADDRSTRLEN];
88 	struct sockaddr_in *sin;
89 	struct sockaddr_in6 *sin6;
90 	int af = sa->sa_family;
91 	const char *ip;
92 
93 	printf(" saf=%d,", af);
94 	switch (af) {
95 	case AF_NETBIOS: /* see nbns_rq.c */
96 	case AF_INET:
97 		sin = (void *)sa;
98 		ip = inet_ntop(AF_INET, &sin->sin_addr,
99 		    paddrbuf, sizeof (paddrbuf));
100 		break;
101 	case AF_INET6:
102 		sin6 = (void *)sa;
103 		ip = inet_ntop(AF_INET6, &sin6->sin6_addr,
104 		    paddrbuf, sizeof (paddrbuf));
105 		break;
106 	default:
107 		ip = "?";
108 		break;
109 	}
110 	printf(" IP=%s\n", ip);
111 }
112 
113 
114 /*
115  * SMB client name resolution - normal, and/or NetBIOS.
116  * Returns an EAI_xxx error number like getaddrinfo(3)
117  */
118 int
smb_ctx_getaddr(struct smb_ctx * ctx)119 smb_ctx_getaddr(struct smb_ctx *ctx)
120 {
121 	struct nb_ctx	*nbc = ctx->ct_nb;
122 	struct addrinfo hints, *res;
123 	char *srvaddr_str;
124 	int gaierr;
125 
126 	if (ctx->ct_fullserver == NULL || ctx->ct_fullserver[0] == '\0')
127 		return (EAI_NONAME);
128 
129 	if (ctx->ct_addrinfo != NULL) {
130 		freeaddrinfo(ctx->ct_addrinfo);
131 		ctx->ct_addrinfo = NULL;
132 	}
133 
134 	/*
135 	 * If the user specified an address, use it,
136 	 * and don't do NetBIOS lookup.
137 	 */
138 	if (ctx->ct_srvaddr_s) {
139 		srvaddr_str = ctx->ct_srvaddr_s;
140 		nbc->nb_flags &= ~NBCF_NS_ENABLE;
141 	} else
142 		srvaddr_str = ctx->ct_fullserver;
143 
144 	/*
145 	 * Default the server name we'll use in the
146 	 * protocol (i.e. NTLM, tree connect).
147 	 */
148 	strlcpy(ctx->ct_srvname, ctx->ct_fullserver,
149 	    sizeof (ctx->ct_srvname));
150 
151 	/*
152 	 * Try to lookup the host address using the
153 	 * normal name-to-IP address mechanisms.
154 	 * If that fails, we MAY try NetBIOS.
155 	 */
156 	memset(&hints, 0, sizeof (hints));
157 	hints.ai_flags = AI_CANONNAME;
158 	hints.ai_family = PF_UNSPEC;
159 	hints.ai_socktype = SOCK_STREAM;
160 	gaierr = getaddrinfo(srvaddr_str, smb_port, &hints, &res);
161 	if (gaierr == 0) {
162 		ctx->ct_addrinfo = res;
163 		return (0);
164 	}
165 
166 	/*
167 	 * If we really want to support NetBIOS, we should add
168 	 * an AF_NETBIOS entry to the address list here.
169 	 * For now, let's just skip NetBIOS.
170 	 * (Can we just kill NetBIOS?  Please? :)
171 	 */
172 #if 0	/* XXX Just kill NetBIOS? */
173 	/*
174 	 * If regular IP name lookup failed, try NetBIOS,
175 	 * but only if given a valid NetBIOS name and if
176 	 * NetBIOS name lookup is enabled.
177 	 */
178 	if (nbc->nb_flags & NBCF_NS_ENABLE) {
179 		int gaierr2 = nbns_getaddrinfo(ctx->ct_fullserver, nbc, &res);
180 		if (gaierr2 == 0) {
181 			if (res->ai_canonname)
182 				strlcpy(ctx->ct_srvname,
183 				    res->ai_canonname,
184 				    sizeof (ctx->ct_srvname));
185 			ctx->ct_addrinfo = res;
186 			return (0);
187 		}
188 	}
189 #endif
190 
191 	/*
192 	 * Return the original error from getaddrinfo
193 	 */
194 	if (smb_verbose) {
195 		smb_error(dgettext(TEXT_DOMAIN,
196 		    "getaddrinfo: %s: %s"), 0,
197 		    ctx->ct_fullserver,
198 		    gai_strerror(gaierr));
199 	}
200 	return (gaierr);
201 }
202