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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: un.c,v 1.7 2003/11/29 20:36:07 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 1.7 2003/11/29 20:36:07 mdw |
33 | * Privileged outgoing connections. |
34 | * |
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35 | * Revision 1.6 2003/11/25 14:08:23 mdw |
36 | * Debianization. Socket target options. Internet binding. |
37 | * |
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38 | * Revision 1.5 2002/02/22 23:43:32 mdw |
39 | * Call @xfree@ rather than @free@. |
40 | * |
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41 | * Revision 1.4 2000/08/01 17:59:56 mdw |
42 | * Switch over to using `size_t' for socket address lengths. |
43 | * |
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44 | * Revision 1.3 2000/08/01 17:58:32 mdw |
45 | * Remove unnecessary <ctype.h> header. |
46 | * |
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47 | * Revision 1.2 1999/07/27 18:30:53 mdw |
48 | * Various minor portability fixes. |
49 | * |
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50 | * Revision 1.1 1999/07/26 23:34:11 mdw |
51 | * New socket address types. |
52 | * |
53 | */ |
54 | |
55 | /*----- Header files ------------------------------------------------------*/ |
56 | |
57 | #include "config.h" |
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58 | #undef sun /* Cretins */ |
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59 | |
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60 | #include <errno.h> |
61 | #include <limits.h> |
62 | #include <stddef.h> |
63 | #include <stdio.h> |
64 | #include <stdlib.h> |
65 | #include <string.h> |
66 | |
67 | #include <sys/types.h> |
68 | #include <unistd.h> |
69 | |
70 | #include <sys/socket.h> |
71 | #include <sys/un.h> |
72 | #include <arpa/inet.h> |
73 | #include <netdb.h> |
74 | |
75 | #include <mLib/alloc.h> |
76 | #include <mLib/dstr.h> |
77 | #include <mLib/report.h> |
78 | #include <mLib/sub.h> |
79 | |
80 | #include "addr.h" |
81 | #include "conf.h" |
82 | #include "fattr.h" |
83 | #include "fw.h" |
84 | #include "reffd.h" |
85 | #include "scan.h" |
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86 | #include "socket.h" |
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87 | #include "un.h" |
88 | |
89 | /*----- Data structures ---------------------------------------------------*/ |
90 | |
91 | typedef struct un_addr { |
92 | addr a; |
93 | struct sockaddr_un sun; |
94 | } un_addr; |
95 | |
96 | typedef struct un_opts { |
97 | addr_opts ao; |
98 | fattr f; |
99 | } un_opts; |
100 | |
101 | /*----- Protocol operations -----------------------------------------------*/ |
102 | |
103 | /* --- @read@ --- */ |
104 | |
105 | static addr *un_read(scanner *sc, unsigned type) |
106 | { |
107 | dstr d = DSTR_INIT; |
108 | un_addr *ua; |
109 | |
110 | conf_name(sc, '/', &d); |
111 | ua = xmalloc(sizeof(addr) + |
112 | offsetof(struct sockaddr_un, sun_path) + |
113 | d.len + 1); |
114 | ua->a.ops = &un_ops; |
115 | ua->a.sz = offsetof(struct sockaddr_un, sun_path) + d.len + 1; |
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116 | memset(&ua->sun, 0, ua->a.sz); |
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117 | ua->sun.sun_family = AF_UNIX; |
118 | memcpy(ua->sun.sun_path, d.buf, d.len + 1); |
119 | dstr_destroy(&d); |
120 | return (&ua->a); |
121 | } |
122 | |
123 | /* --- @destroy@ --- */ |
124 | |
125 | static void un_destroy(addr *a) |
126 | { |
127 | un_addr *ua = (un_addr *)a; |
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128 | xfree(ua); |
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129 | } |
130 | |
131 | /* --- @print@ --- */ |
132 | |
133 | static void un_print(addr *a, unsigned type, dstr *d) |
134 | { |
135 | un_addr *ua = (un_addr *)a; |
136 | dstr_puts(d, "unix:"); |
137 | dstr_puts(d, ua->sun.sun_path); |
138 | } |
139 | |
140 | /* --- @initopts@ --- */ |
141 | |
142 | static addr_opts *un_initopts(void) |
143 | { |
144 | un_opts *uo = CREATE(un_opts); |
145 | uo->f = fattr_global; |
146 | return (&uo->ao); |
147 | } |
148 | |
149 | /* --- @option@ --- */ |
150 | |
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151 | static int srcopt(scanner *sc, addr_opts *ao) |
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152 | { |
153 | un_opts *uo = (un_opts *)ao; |
154 | CONF_BEGIN(sc, "unix", "Unix domain socket") |
155 | |
156 | if (fattr_option(sc, uo ? &uo->f : &fattr_global)) |
157 | CONF_ACCEPT; |
158 | |
159 | CONF_END; |
160 | } |
161 | |
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162 | static int un_option(scanner *sc, addr_opts *ao, unsigned type) |
163 | { |
164 | CONF_BEGIN(sc, "unix", "Unix domain socket"); |
165 | if (type != ADDR_DEST && srcopt(sc, ao)) |
166 | CONF_ACCEPT; |
167 | CONF_END; |
168 | } |
169 | |
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170 | /* --- @accept@ --- */ |
171 | |
172 | static reffd *un_accept(int fd, addr_opts *ao, const char *desc) |
173 | { |
174 | int nfd; |
175 | un_opts *uo = (un_opts *)ao; |
176 | |
177 | /* --- Accept the new connection --- */ |
178 | |
179 | { |
180 | char buf[PATH_MAX + sizeof(struct sockaddr)]; |
181 | struct sockaddr_un *sun = (struct sockaddr_un *)buf; |
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182 | size_t sunsz = sizeof(buf); |
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183 | |
184 | if ((nfd = accept(fd, (struct sockaddr *)sun, &sunsz)) < 0) |
185 | return (0); |
186 | } |
187 | |
188 | /* --- Log the connection --- * |
189 | * |
190 | * It'd be really nice if I could find out who the user is, but I can't in |
191 | * anything like a portable way. |
192 | */ |
193 | |
194 | if (!(uo->ao.f & ADDRF_NOLOG)) |
195 | fw_log(-1, "[%s] accepted", desc); |
196 | return (reffd_init(nfd)); |
197 | } |
198 | |
199 | /* --- @freeopts@ --- */ |
200 | |
201 | static void un_freeopts(addr_opts *ao) |
202 | { |
203 | un_opts *uo = (un_opts *)ao; |
204 | DESTROY(uo); |
205 | } |
206 | |
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207 | /* --- @bind@ --- */ |
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208 | |
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209 | static int un_bind(addr *a, addr_opts *ao) |
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210 | { |
211 | un_addr *ua = (un_addr *)a; |
212 | un_opts *uo = (un_opts *)ao; |
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213 | int fd; |
214 | |
215 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
216 | goto fail_0; |
217 | if (bind(fd, (struct sockaddr *)&ua->sun, sizeof(ua->sun))) |
218 | goto fail_1; |
219 | if (fattr_apply(ua->sun.sun_path, &uo->f)) |
220 | goto fail_1; |
221 | return (fd); |
222 | |
223 | fail_1: |
224 | close(fd); |
225 | fail_0: |
226 | return (-1); |
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227 | } |
228 | |
229 | /* --- @unbind@ --- */ |
230 | |
231 | static void un_unbind(addr *a) |
232 | { |
233 | un_addr *ua = (un_addr *)a; |
234 | unlink(ua->sun.sun_path); |
235 | } |
236 | |
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237 | /* --- @connect@ --- */ |
238 | |
239 | static int un_connect(addr *a, addr_opts *ao, conn *c, endpt *e) |
240 | { |
241 | un_addr *ua = (un_addr *)a; |
242 | int fd; |
243 | |
244 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
245 | goto fail_0; |
246 | return (conn_init(c, sel, fd, (struct sockaddr *)&ua->sun, sizeof(ua->sun), |
247 | starget_connected, e)); |
248 | fail_0: |
249 | return (-1); |
250 | } |
251 | |
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252 | /* --- Protocol definition --- */ |
253 | |
254 | addr_ops un_ops = { |
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255 | "unix", |
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256 | un_read, un_destroy, un_print, |
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257 | un_initopts, un_option, 0, un_freeopts, un_bind, un_unbind, un_accept, |
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258 | 0, 0, un_connect |
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259 | }; |
260 | |
261 | /*----- That's all, folks -------------------------------------------------*/ |