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42f4e3c4 LP |
1 | /*-*- Mode: C; c-basic-offset: 8 -*-*/ |
2 | ||
3 | #include <assert.h> | |
4 | #include <string.h> | |
5 | #include <unistd.h> | |
6 | #include <errno.h> | |
7 | #include <stdlib.h> | |
8 | #include <arpa/inet.h> | |
9 | #include <stdio.h> | |
10 | ||
11 | #include "macro.h" | |
12 | #include "util.h" | |
13 | #include "socket-util.h" | |
14 | ||
15 | int address_parse(Address *a, const char *s) { | |
16 | int r; | |
17 | char *e, *n; | |
18 | unsigned u; | |
19 | ||
20 | assert(a); | |
21 | assert(s); | |
22 | ||
23 | memset(a, 0, sizeof(*a)); | |
24 | ||
25 | if (*s == '[') { | |
26 | /* IPv6 in [x:.....:z]:p notation */ | |
27 | ||
28 | if (!(e = strchr(s+1, ']'))) | |
29 | return -EINVAL; | |
30 | ||
31 | if (!(n = strndup(s+1, e-s-1))) | |
32 | return -ENOMEM; | |
33 | ||
34 | errno = 0; | |
35 | if (inet_pton(AF_INET6, n, &a->sockaddr.in6.sin6_addr) <= 0) { | |
36 | free(n); | |
37 | return errno != 0 ? -errno : -EINVAL; | |
38 | } | |
39 | ||
40 | free(n); | |
41 | ||
42 | e++; | |
43 | if (*e != ':') | |
44 | return -EINVAL; | |
45 | ||
46 | e++; | |
47 | if ((r = safe_atou(e, &u)) < 0) | |
48 | return r; | |
49 | ||
50 | if (u <= 0 || u > 0xFFFF) | |
51 | return -EINVAL; | |
52 | ||
53 | a->sockaddr.in6.sin6_family = AF_INET6; | |
54 | a->sockaddr.in6.sin6_port = htons((uint16_t) u); | |
55 | a->size = sizeof(struct sockaddr_in6); | |
56 | a->bind_ipv6_only = true; | |
57 | ||
58 | } else if (*s == '/') { | |
59 | /* AF_UNIX socket */ | |
60 | ||
61 | size_t l; | |
62 | ||
63 | l = strlen(s); | |
64 | if (l >= sizeof(a->sockaddr.un.sun_path)) | |
65 | return -EINVAL; | |
66 | ||
67 | a->sockaddr.un.sun_family = AF_UNIX; | |
68 | memcpy(a->sockaddr.un.sun_path, s, l); | |
69 | a->size = sizeof(sa_family_t) + l + 1; | |
70 | ||
71 | } else if (*s == '=') { | |
72 | /* Abstract AF_UNIX socket */ | |
73 | size_t l; | |
74 | ||
75 | l = strlen(s+1); | |
76 | if (l >= sizeof(a->sockaddr.un.sun_path) - 1) | |
77 | return -EINVAL; | |
78 | ||
79 | a->sockaddr.un.sun_family = AF_UNIX; | |
80 | memcpy(a->sockaddr.un.sun_path+1, s+1, l); | |
81 | a->size = sizeof(struct sockaddr_un); | |
82 | ||
83 | } else { | |
84 | ||
85 | if ((e = strchr(s, ':'))) { | |
86 | ||
87 | /* IPv4 in w.x.y.z:p notation */ | |
88 | if (!(n = strndup(s, e-s))) | |
89 | return -ENOMEM; | |
90 | ||
91 | errno = 0; | |
92 | if (inet_pton(AF_INET, n, &a->sockaddr.in4.sin_addr) <= 0) { | |
93 | free(n); | |
94 | return errno != 0 ? -errno : -EINVAL; | |
95 | } | |
96 | ||
97 | free(n); | |
98 | ||
99 | e++; | |
100 | if ((r = safe_atou(e, &u)) < 0) | |
101 | return r; | |
102 | ||
103 | if (u <= 0 || u > 0xFFFF) | |
104 | return -EINVAL; | |
105 | ||
106 | a->sockaddr.in4.sin_family = AF_INET; | |
107 | a->sockaddr.in4.sin_port = htons((uint16_t) u); | |
108 | a->size = sizeof(struct sockaddr_in); | |
109 | } else { | |
110 | ||
111 | /* Just a port */ | |
112 | if ((r = safe_atou(s, &u)) < 0) | |
113 | return r; | |
114 | ||
115 | if (u <= 0 || u > 0xFFFF) | |
116 | return -EINVAL; | |
117 | ||
118 | a->sockaddr.in6.sin6_family = AF_INET6; | |
119 | memcpy(&a->sockaddr.in6.sin6_addr, &in6addr_any, INET6_ADDRSTRLEN); | |
120 | a->sockaddr.in6.sin6_port = htons((uint16_t) u); | |
121 | a->size = sizeof(struct sockaddr_in6); | |
122 | } | |
123 | } | |
124 | ||
125 | return 0; | |
126 | } | |
127 | ||
128 | int address_verify(const Address *a) { | |
129 | assert(a); | |
130 | ||
131 | switch (address_family(a)) { | |
132 | case AF_INET: | |
133 | if (a->size != sizeof(struct sockaddr_in)) | |
134 | return -EINVAL; | |
135 | ||
136 | if (a->sockaddr.in4.sin_port == 0) | |
137 | return -EINVAL; | |
138 | ||
139 | return 0; | |
140 | ||
141 | case AF_INET6: | |
142 | if (a->size != sizeof(struct sockaddr_in6)) | |
143 | return -EINVAL; | |
144 | ||
145 | if (a->sockaddr.in6.sin6_port == 0) | |
146 | return -EINVAL; | |
147 | ||
148 | return 0; | |
149 | ||
150 | case AF_UNIX: | |
151 | if (a->size < sizeof(sa_family_t)) | |
152 | return -EINVAL; | |
153 | ||
154 | if (a->size > sizeof(sa_family_t)) { | |
155 | ||
156 | if (a->sockaddr.un.sun_path[0] == 0) { | |
157 | /* abstract */ | |
158 | if (a->size != sizeof(struct sockaddr_un)) | |
159 | return -EINVAL; | |
160 | } else { | |
161 | char *e; | |
162 | ||
163 | /* path */ | |
164 | if (!(e = memchr(a->sockaddr.un.sun_path, 0, sizeof(a->sockaddr.un.sun_path)))) | |
165 | return -EINVAL; | |
166 | ||
167 | if (a->size != sizeof(sa_family_t) + (e - a->sockaddr.un.sun_path) + 1) | |
168 | return -EINVAL; | |
169 | } | |
170 | } | |
171 | ||
172 | return 0; | |
173 | ||
174 | default: | |
175 | return -EAFNOSUPPORT; | |
176 | } | |
177 | } | |
178 | ||
179 | int address_print(const Address *a, char **p) { | |
180 | int r; | |
181 | assert(a); | |
182 | assert(p); | |
183 | ||
184 | if ((r = address_verify(a)) < 0) | |
185 | return r; | |
186 | ||
187 | switch (address_family(a)) { | |
188 | case AF_INET: { | |
189 | char *ret; | |
190 | ||
191 | if (!(ret = new(char, INET_ADDRSTRLEN+1+5+1))) | |
192 | return -ENOMEM; | |
193 | ||
194 | if (!inet_ntop(AF_INET, &a->sockaddr.in4.sin_addr, ret, INET_ADDRSTRLEN)) { | |
195 | free(ret); | |
196 | return -errno; | |
197 | } | |
198 | ||
199 | sprintf(strchr(ret, 0), ":%u", ntohs(a->sockaddr.in4.sin_port)); | |
200 | *p = ret; | |
201 | return 0; | |
202 | } | |
203 | ||
204 | case AF_INET6: { | |
205 | char *ret; | |
206 | ||
207 | if (!(ret = new(char, 1+INET6_ADDRSTRLEN+2+5+1))) | |
208 | return -ENOMEM; | |
209 | ||
210 | ret[0] = '['; | |
211 | if (!inet_ntop(AF_INET6, &a->sockaddr.in6.sin6_addr, ret+1, INET6_ADDRSTRLEN)) { | |
212 | free(ret); | |
213 | return -errno; | |
214 | } | |
215 | ||
216 | sprintf(strchr(ret, 0), "]:%u", ntohs(a->sockaddr.in6.sin6_port)); | |
217 | *p = ret; | |
218 | return 0; | |
219 | } | |
220 | ||
221 | case AF_UNIX: { | |
222 | char *ret; | |
223 | ||
224 | if (a->size <= sizeof(sa_family_t)) { | |
225 | ||
226 | if (!(ret = strdup("<unamed>"))) | |
227 | return -ENOMEM; | |
228 | ||
229 | } else if (a->sockaddr.un.sun_path[0] == 0) { | |
230 | /* abstract */ | |
231 | ||
232 | /* FIXME: We assume we can print the | |
233 | * socket path here and that it hasn't | |
234 | * more than one NUL byte. That is | |
235 | * actually an invalid assumption */ | |
236 | ||
237 | if (!(ret = new(char, sizeof(a->sockaddr.un.sun_path)+1))) | |
238 | return -ENOMEM; | |
239 | ||
240 | ret[0] = '='; | |
241 | memcpy(ret+1, a->sockaddr.un.sun_path+1, sizeof(a->sockaddr.un.sun_path)-1); | |
242 | ret[sizeof(a->sockaddr.un.sun_path)] = 0; | |
243 | ||
244 | } else { | |
245 | ||
246 | if (!(ret = strdup(a->sockaddr.un.sun_path))) | |
247 | return -ENOMEM; | |
248 | } | |
249 | ||
250 | *p = ret; | |
251 | return 0; | |
252 | } | |
253 | ||
254 | default: | |
255 | return -EINVAL; | |
256 | } | |
257 | } | |
258 | ||
259 | int address_listen(const Address *a, int backlog) { | |
260 | int r, fd; | |
261 | assert(a); | |
262 | ||
263 | if ((r = address_verify(a)) < 0) | |
264 | return r; | |
265 | ||
266 | if ((fd = socket(address_family(a), a->type, 0)) < 0) | |
267 | return -errno; | |
268 | ||
269 | if (bind(fd, &a->sockaddr.sa, a->size) < 0) { | |
270 | close_nointr(fd); | |
271 | return -errno; | |
272 | } | |
273 | ||
274 | if (a->type == SOCK_STREAM) | |
275 | if (listen(fd, backlog) < 0) { | |
276 | close_nointr(fd); | |
277 | return -errno; | |
278 | } | |
279 | ||
280 | if (address_family(a) == AF_INET6) { | |
281 | int flag = a->bind_ipv6_only; | |
282 | ||
283 | if (setsockopt(fd, IPPROTO_IPV6, IPV6_V6ONLY, &flag, sizeof(flag)) < 0) { | |
284 | close_nointr(fd); | |
285 | return -errno; | |
286 | } | |
287 | } | |
288 | ||
289 | return 0; | |
290 | } |