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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: un.c,v 1.9 2004/04/08 01:36:25 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 | |
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29 | /*----- Header files ------------------------------------------------------*/ |
30 | |
31 | #include "config.h" |
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32 | #undef sun /* Cretins */ |
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33 | |
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34 | #include <errno.h> |
35 | #include <limits.h> |
36 | #include <stddef.h> |
37 | #include <stdio.h> |
38 | #include <stdlib.h> |
39 | #include <string.h> |
40 | |
41 | #include <sys/types.h> |
42 | #include <unistd.h> |
43 | |
44 | #include <sys/socket.h> |
45 | #include <sys/un.h> |
46 | #include <arpa/inet.h> |
47 | #include <netdb.h> |
48 | |
49 | #include <mLib/alloc.h> |
50 | #include <mLib/dstr.h> |
51 | #include <mLib/report.h> |
52 | #include <mLib/sub.h> |
53 | |
54 | #include "addr.h" |
55 | #include "conf.h" |
56 | #include "fattr.h" |
57 | #include "fw.h" |
58 | #include "reffd.h" |
59 | #include "scan.h" |
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60 | #include "socket.h" |
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61 | #include "un.h" |
62 | |
63 | /*----- Data structures ---------------------------------------------------*/ |
64 | |
65 | typedef struct un_addr { |
66 | addr a; |
67 | struct sockaddr_un sun; |
68 | } un_addr; |
69 | |
70 | typedef struct un_opts { |
71 | addr_opts ao; |
72 | fattr f; |
73 | } un_opts; |
74 | |
75 | /*----- Protocol operations -----------------------------------------------*/ |
76 | |
77 | /* --- @read@ --- */ |
78 | |
79 | static addr *un_read(scanner *sc, unsigned type) |
80 | { |
81 | dstr d = DSTR_INIT; |
82 | un_addr *ua; |
83 | |
84 | conf_name(sc, '/', &d); |
85 | ua = xmalloc(sizeof(addr) + |
86 | offsetof(struct sockaddr_un, sun_path) + |
87 | d.len + 1); |
88 | ua->a.ops = &un_ops; |
89 | ua->a.sz = offsetof(struct sockaddr_un, sun_path) + d.len + 1; |
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90 | memset(&ua->sun, 0, ua->a.sz); |
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91 | ua->sun.sun_family = AF_UNIX; |
92 | memcpy(ua->sun.sun_path, d.buf, d.len + 1); |
93 | dstr_destroy(&d); |
94 | return (&ua->a); |
95 | } |
96 | |
97 | /* --- @destroy@ --- */ |
98 | |
99 | static void un_destroy(addr *a) |
100 | { |
101 | un_addr *ua = (un_addr *)a; |
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102 | xfree(ua); |
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103 | } |
104 | |
105 | /* --- @print@ --- */ |
106 | |
107 | static void un_print(addr *a, unsigned type, dstr *d) |
108 | { |
109 | un_addr *ua = (un_addr *)a; |
110 | dstr_puts(d, "unix:"); |
111 | dstr_puts(d, ua->sun.sun_path); |
112 | } |
113 | |
114 | /* --- @initopts@ --- */ |
115 | |
116 | static addr_opts *un_initopts(void) |
117 | { |
118 | un_opts *uo = CREATE(un_opts); |
119 | uo->f = fattr_global; |
120 | return (&uo->ao); |
121 | } |
122 | |
123 | /* --- @option@ --- */ |
124 | |
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125 | static int srcopt(scanner *sc, addr_opts *ao) |
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126 | { |
127 | un_opts *uo = (un_opts *)ao; |
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128 | CONF_BEGIN(sc, "source", "Unix domain socket source") |
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129 | |
130 | if (fattr_option(sc, uo ? &uo->f : &fattr_global)) |
131 | CONF_ACCEPT; |
132 | |
133 | CONF_END; |
134 | } |
135 | |
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136 | static int un_option(scanner *sc, addr_opts *ao, unsigned type) |
137 | { |
138 | CONF_BEGIN(sc, "unix", "Unix domain socket"); |
139 | if (type != ADDR_DEST && srcopt(sc, ao)) |
140 | CONF_ACCEPT; |
141 | CONF_END; |
142 | } |
143 | |
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144 | /* --- @accept@ --- */ |
145 | |
146 | static reffd *un_accept(int fd, addr_opts *ao, const char *desc) |
147 | { |
148 | int nfd; |
149 | un_opts *uo = (un_opts *)ao; |
150 | |
151 | /* --- Accept the new connection --- */ |
152 | |
153 | { |
154 | char buf[PATH_MAX + sizeof(struct sockaddr)]; |
155 | struct sockaddr_un *sun = (struct sockaddr_un *)buf; |
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156 | size_t sunsz = sizeof(buf); |
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157 | |
158 | if ((nfd = accept(fd, (struct sockaddr *)sun, &sunsz)) < 0) |
159 | return (0); |
160 | } |
161 | |
162 | /* --- Log the connection --- * |
163 | * |
164 | * It'd be really nice if I could find out who the user is, but I can't in |
165 | * anything like a portable way. |
166 | */ |
167 | |
168 | if (!(uo->ao.f & ADDRF_NOLOG)) |
169 | fw_log(-1, "[%s] accepted", desc); |
170 | return (reffd_init(nfd)); |
171 | } |
172 | |
173 | /* --- @freeopts@ --- */ |
174 | |
175 | static void un_freeopts(addr_opts *ao) |
176 | { |
177 | un_opts *uo = (un_opts *)ao; |
178 | DESTROY(uo); |
179 | } |
180 | |
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181 | /* --- @bind@ --- */ |
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182 | |
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183 | static int un_bind(addr *a, addr_opts *ao) |
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184 | { |
185 | un_addr *ua = (un_addr *)a; |
186 | un_opts *uo = (un_opts *)ao; |
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187 | int fd; |
188 | |
189 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
190 | goto fail_0; |
191 | if (bind(fd, (struct sockaddr *)&ua->sun, sizeof(ua->sun))) |
192 | goto fail_1; |
193 | if (fattr_apply(ua->sun.sun_path, &uo->f)) |
194 | goto fail_1; |
195 | return (fd); |
196 | |
197 | fail_1: |
198 | close(fd); |
199 | fail_0: |
200 | return (-1); |
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201 | } |
202 | |
203 | /* --- @unbind@ --- */ |
204 | |
205 | static void un_unbind(addr *a) |
206 | { |
207 | un_addr *ua = (un_addr *)a; |
208 | unlink(ua->sun.sun_path); |
209 | } |
210 | |
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211 | /* --- @connect@ --- */ |
212 | |
213 | static int un_connect(addr *a, addr_opts *ao, conn *c, endpt *e) |
214 | { |
215 | un_addr *ua = (un_addr *)a; |
216 | int fd; |
217 | |
218 | if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) |
219 | goto fail_0; |
220 | return (conn_init(c, sel, fd, (struct sockaddr *)&ua->sun, sizeof(ua->sun), |
221 | starget_connected, e)); |
222 | fail_0: |
223 | return (-1); |
224 | } |
225 | |
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226 | /* --- Protocol definition --- */ |
227 | |
228 | addr_ops un_ops = { |
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229 | "unix", |
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230 | un_read, un_destroy, un_print, |
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231 | un_initopts, un_option, 0, un_freeopts, un_bind, un_unbind, un_accept, |
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232 | 0, 0, un_connect |
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233 | }; |
234 | |
235 | /*----- That's all, folks -------------------------------------------------*/ |