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