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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: un.c,v 1.6 2003/11/25 14:08:23 mdw Exp $ |
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4 | * |
5 | * Protocol specific definitions for Unix-domain sockets |
6 | * |
7 | * (c) 1999 Straylight/Edgeware |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `fw' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: un.c,v $ |
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32 | * Revision 1.6 2003/11/25 14:08:23 mdw |
33 | * Debianization. Socket target options. Internet binding. |
34 | * |
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35 | * Revision 1.5 2002/02/22 23:43:32 mdw |
36 | * Call @xfree@ rather than @free@. |
37 | * |
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38 | * Revision 1.4 2000/08/01 17:59:56 mdw |
39 | * Switch over to using `size_t' for socket address lengths. |
40 | * |
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41 | * Revision 1.3 2000/08/01 17:58:32 mdw |
42 | * Remove unnecessary <ctype.h> header. |
43 | * |
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44 | * Revision 1.2 1999/07/27 18:30:53 mdw |
45 | * Various minor portability fixes. |
46 | * |
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47 | * Revision 1.1 1999/07/26 23:34:11 mdw |
48 | * New socket address types. |
49 | * |
50 | */ |
51 | |
52 | /*----- Header files ------------------------------------------------------*/ |
53 | |
54 | #include "config.h" |
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55 | #undef sun /* Cretins */ |
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56 | |
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57 | #include <errno.h> |
58 | #include <limits.h> |
59 | #include <stddef.h> |
60 | #include <stdio.h> |
61 | #include <stdlib.h> |
62 | #include <string.h> |
63 | |
64 | #include <sys/types.h> |
65 | #include <unistd.h> |
66 | |
67 | #include <sys/socket.h> |
68 | #include <sys/un.h> |
69 | #include <arpa/inet.h> |
70 | #include <netdb.h> |
71 | |
72 | #include <mLib/alloc.h> |
73 | #include <mLib/dstr.h> |
74 | #include <mLib/report.h> |
75 | #include <mLib/sub.h> |
76 | |
77 | #include "addr.h" |
78 | #include "conf.h" |
79 | #include "fattr.h" |
80 | #include "fw.h" |
81 | #include "reffd.h" |
82 | #include "scan.h" |
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83 | #include "socket.h" |
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84 | #include "un.h" |
85 | |
86 | /*----- Data structures ---------------------------------------------------*/ |
87 | |
88 | typedef struct un_addr { |
89 | addr a; |
90 | struct sockaddr_un sun; |
91 | } un_addr; |
92 | |
93 | typedef struct un_opts { |
94 | addr_opts ao; |
95 | fattr f; |
96 | } un_opts; |
97 | |
98 | /*----- Protocol operations -----------------------------------------------*/ |
99 | |
100 | /* --- @read@ --- */ |
101 | |
102 | static addr *un_read(scanner *sc, unsigned type) |
103 | { |
104 | dstr d = DSTR_INIT; |
105 | un_addr *ua; |
106 | |
107 | conf_name(sc, '/', &d); |
108 | ua = xmalloc(sizeof(addr) + |
109 | offsetof(struct sockaddr_un, sun_path) + |
110 | d.len + 1); |
111 | ua->a.ops = &un_ops; |
112 | ua->a.sz = offsetof(struct sockaddr_un, sun_path) + d.len + 1; |
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113 | memset(&ua->sun, 0, ua->a.sz); |
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114 | ua->sun.sun_family = AF_UNIX; |
115 | memcpy(ua->sun.sun_path, d.buf, d.len + 1); |
116 | dstr_destroy(&d); |
117 | return (&ua->a); |
118 | } |
119 | |
120 | /* --- @destroy@ --- */ |
121 | |
122 | static void un_destroy(addr *a) |
123 | { |
124 | un_addr *ua = (un_addr *)a; |
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125 | xfree(ua); |
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126 | } |
127 | |
128 | /* --- @print@ --- */ |
129 | |
130 | static void un_print(addr *a, unsigned type, dstr *d) |
131 | { |
132 | un_addr *ua = (un_addr *)a; |
133 | dstr_puts(d, "unix:"); |
134 | dstr_puts(d, ua->sun.sun_path); |
135 | } |
136 | |
137 | /* --- @initopts@ --- */ |
138 | |
139 | static addr_opts *un_initopts(void) |
140 | { |
141 | un_opts *uo = CREATE(un_opts); |
142 | uo->f = fattr_global; |
143 | return (&uo->ao); |
144 | } |
145 | |
146 | /* --- @option@ --- */ |
147 | |
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148 | static int srcopt(scanner *sc, addr_opts *ao) |
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149 | { |
150 | un_opts *uo = (un_opts *)ao; |
151 | CONF_BEGIN(sc, "unix", "Unix domain socket") |
152 | |
153 | if (fattr_option(sc, uo ? &uo->f : &fattr_global)) |
154 | CONF_ACCEPT; |
155 | |
156 | CONF_END; |
157 | } |
158 | |
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159 | static int un_option(scanner *sc, addr_opts *ao, unsigned type) |
160 | { |
161 | CONF_BEGIN(sc, "unix", "Unix domain socket"); |
162 | if (type != ADDR_DEST && srcopt(sc, ao)) |
163 | CONF_ACCEPT; |
164 | CONF_END; |
165 | } |
166 | |
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167 | /* --- @accept@ --- */ |
168 | |
169 | static reffd *un_accept(int fd, addr_opts *ao, const char *desc) |
170 | { |
171 | int nfd; |
172 | un_opts *uo = (un_opts *)ao; |
173 | |
174 | /* --- Accept the new connection --- */ |
175 | |
176 | { |
177 | char buf[PATH_MAX + sizeof(struct sockaddr)]; |
178 | struct sockaddr_un *sun = (struct sockaddr_un *)buf; |
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179 | size_t sunsz = sizeof(buf); |
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180 | |
181 | if ((nfd = accept(fd, (struct sockaddr *)sun, &sunsz)) < 0) |
182 | return (0); |
183 | } |
184 | |
185 | /* --- Log the connection --- * |
186 | * |
187 | * It'd be really nice if I could find out who the user is, but I can't in |
188 | * anything like a portable way. |
189 | */ |
190 | |
191 | if (!(uo->ao.f & ADDRF_NOLOG)) |
192 | fw_log(-1, "[%s] accepted", desc); |
193 | return (reffd_init(nfd)); |
194 | } |
195 | |
196 | /* --- @freeopts@ --- */ |
197 | |
198 | static void un_freeopts(addr_opts *ao) |
199 | { |
200 | un_opts *uo = (un_opts *)ao; |
201 | DESTROY(uo); |
202 | } |
203 | |
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204 | /* --- @bind@ --- */ |
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205 | |
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206 | static int un_bind(addr *a, addr_opts *ao) |
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207 | { |
208 | un_addr *ua = (un_addr *)a; |
209 | un_opts *uo = (un_opts *)ao; |
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210 | int fd; |
211 | |
212 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
213 | goto fail_0; |
214 | if (bind(fd, (struct sockaddr *)&ua->sun, sizeof(ua->sun))) |
215 | goto fail_1; |
216 | if (fattr_apply(ua->sun.sun_path, &uo->f)) |
217 | goto fail_1; |
218 | return (fd); |
219 | |
220 | fail_1: |
221 | close(fd); |
222 | fail_0: |
223 | return (-1); |
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224 | } |
225 | |
226 | /* --- @unbind@ --- */ |
227 | |
228 | static void un_unbind(addr *a) |
229 | { |
230 | un_addr *ua = (un_addr *)a; |
231 | unlink(ua->sun.sun_path); |
232 | } |
233 | |
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234 | /* --- @connect@ --- */ |
235 | |
236 | static int un_connect(addr *a, addr_opts *ao, conn *c, endpt *e) |
237 | { |
238 | un_addr *ua = (un_addr *)a; |
239 | int fd; |
240 | |
241 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
242 | goto fail_0; |
243 | return (conn_init(c, sel, fd, (struct sockaddr *)&ua->sun, sizeof(ua->sun), |
244 | starget_connected, e)); |
245 | fail_0: |
246 | return (-1); |
247 | } |
248 | |
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249 | /* --- Protocol definition --- */ |
250 | |
251 | addr_ops un_ops = { |
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252 | "unix", |
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253 | un_read, un_destroy, un_print, |
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254 | un_initopts, un_option, un_freeopts, un_bind, un_unbind, un_accept, |
255 | 0, 0, un_connect |
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256 | }; |
257 | |
258 | /*----- That's all, folks -------------------------------------------------*/ |