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