Commit | Line | Data |
---|---|---|
ca51b51d MW |
1 | #include "cdb.h" |
2 | #include "stralloc.h" | |
3 | #include "byte.h" | |
4 | #include "str.h" | |
5 | #include "addrcheck.h" | |
6 | #include <errno.h> | |
0a045fc1 | 7 | #include <unistd.h> |
ca51b51d MW |
8 | |
9 | /* #define DEBUG */ | |
10 | #ifdef DEBUG | |
11 | # define D(x) x | |
12 | # include <stdio.h> | |
13 | # include <sys/types.h> | |
ca51b51d MW |
14 | #else |
15 | # define D(x) | |
16 | #endif | |
17 | ||
18 | #define STRALLOC_INIT { 0 } | |
19 | ||
dd1ee021 MW |
20 | /* --- @probe@ --- * |
21 | * | |
22 | * Arguments: @int cdb@ = the CDB file descriptor | |
23 | * @int prefix@ = the prefix character (e.g., @'V'@) | |
24 | * @const char *key, int len@ = the key string and its length | |
25 | * @const char *suffix@ = a suffix to append to the key | |
26 | * @const char **kp@ = where to put the full key string | |
27 | * @uint32 *dlen@ = where to put the answer's length | |
28 | * | |
29 | * Returns: Zero if the lookup failed, @+1@ on success, or @-1@ for an | |
30 | * error. | |
31 | * | |
32 | * Use: Probes a CDB file. The key looked up is the character | |
33 | * @prefix@ followed by the first @len@ bytes of @key@, followed | |
34 | * by @suffix@ (if non-null). | |
35 | */ | |
36 | ||
ca51b51d | 37 | static int probe(int cdb, int prefix, const char *key, int len, |
0a045fc1 | 38 | const char *suffix, const char **kp, uint32 *dlen) |
ca51b51d MW |
39 | { |
40 | static stralloc k = STRALLOC_INIT; | |
41 | char ch = prefix; | |
42 | int rc; | |
43 | ||
44 | k.len = 0; | |
45 | if (!stralloc_append(&k, &ch) || | |
46 | !stralloc_catb(&k, key, len) || | |
0a045fc1 MW |
47 | (suffix && !stralloc_cats(&k, suffix)) || |
48 | !stralloc_0(&k)) | |
ca51b51d | 49 | return (-1); |
0a045fc1 | 50 | if (kp) *kp = k.s; |
ca51b51d | 51 | D( fprintf(stderr, "*** `%.*s' -> ", k.len, k.s); ) |
0a045fc1 | 52 | rc = cdb_seek(cdb, k.s, k.len - 1, dlen); |
ca51b51d MW |
53 | D( if (rc == -1) |
54 | fprintf(stderr, "error: %s\n", strerror(errno)); | |
55 | else if (rc == 0) | |
56 | fprintf(stderr, "not found\n"); | |
57 | else if (!*dlen) | |
58 | fprintf(stderr, "empty\n"); | |
59 | else { | |
60 | int n = *dlen; | |
61 | int nn; | |
62 | char buf[256]; | |
63 | off_t pos = lseek(cdb, 0, SEEK_CUR); | |
64 | fprintf(stderr, "`"); | |
65 | while (n) { | |
66 | nn = sizeof(buf); if (nn > n) nn = n; | |
67 | read(cdb, buf, nn); | |
68 | fwrite(buf, 1, nn, stderr); | |
69 | n -= nn; | |
70 | } | |
71 | fprintf(stderr, "'\n"); | |
72 | lseek(cdb, pos, SEEK_SET); | |
73 | } ) | |
74 | return (rc); | |
75 | } | |
76 | ||
dd1ee021 MW |
77 | /* --- @localprobe@ --- * |
78 | * | |
79 | * Arguments: @int cdb@ = the CDB file descriptor | |
80 | * @const char *sender@ = the envelope-sender address | |
81 | * @const char *key, int len@ = the (possibly defaulted) mailbox | |
82 | * name to look up | |
83 | * @const char *suffix@ = a suffix to append to the key (e.g., | |
84 | * @"-default"@) | |
85 | * @const char *tail@ = the tail of the local address matching | |
86 | * any defaulted extension part | |
87 | * @int *rc@ = where to put the answer | |
88 | * | |
89 | * Returns: Positive if found, zero if not found, negative on error. | |
90 | * | |
91 | * Use: Looks up a local-part in the database. This may involve | |
92 | * invoking a Userv service for the recipient's owner. | |
93 | */ | |
94 | ||
0a045fc1 MW |
95 | static int localprobe(int cdb, const char *sender, |
96 | const char *key, int len, | |
97 | const char *suffix, const char *tail, int *rc) | |
ca51b51d MW |
98 | { |
99 | int err; | |
100 | uint32 dlen; | |
101 | char ch; | |
0a045fc1 MW |
102 | const char *k; |
103 | static stralloc u = STRALLOC_INIT; | |
104 | static stralloc serv = STRALLOC_INIT; | |
105 | int kid; | |
106 | int n; | |
107 | int wstat; | |
108 | int p[2]; | |
109 | ||
110 | if ((err = probe(cdb, 'L', key, len, suffix, &k, &dlen)) < 0) | |
ca51b51d MW |
111 | return (-1); |
112 | if (!err) { *rc = 0; return (0); } | |
0a045fc1 | 113 | if (!dlen) { errno = EINVAL; return (-1); } |
ca51b51d | 114 | if (read(cdb, &ch, 1) != 1) { errno = EIO; return (-1); } |
0a045fc1 MW |
115 | if (ch == '?') { |
116 | u.len = 0; | |
117 | if (!stralloc_ready(&u, dlen - 1)) return (-1); | |
118 | if (read(cdb, u.s, dlen - 1) != dlen - 1) { errno = EIO; return (-1); } | |
119 | u.len = dlen - 1; | |
120 | serv.len = 0; | |
121 | if (!stralloc_cats(&serv, "addrcheck:") || | |
122 | !stralloc_cats(&serv, k + 1) || | |
123 | !stralloc_0(&serv) || | |
124 | !stralloc_0(&u)) | |
125 | return (-1); | |
126 | D( fprintf(stderr, "asking user:\n\ | |
127 | user = %s; service = %s\n tail = %s; sender = %s\n\ | |
128 | address = %s; key = %s\n", | |
129 | u.s, serv.s, tail, sender, key, k + 1); ) | |
130 | ||
131 | if (pipe(p) || (kid = fork()) == -1) | |
132 | return (-1); | |
133 | if (!kid) { | |
134 | dup2(p[1], 1); | |
135 | close(p[0]); | |
136 | close(p[1]); | |
137 | execl("/usr/bin/userv", "/usr/bin/userv", | |
138 | "-f", "stdin=/dev/null", | |
139 | u.s, serv.s, | |
140 | tail, sender, key, k + 1, | |
141 | (char *)0); | |
142 | _exit(127); | |
143 | } | |
144 | close(p[1]); | |
145 | n = read(p[0], &ch, 1); | |
146 | close(p[0]); | |
147 | if (wait_pid(&wstat, kid) < 0) { return (-1); } | |
148 | D( fprintf(stderr, "userv exited with status %d\n", wstat); ) | |
149 | if (n != 1 || wstat) { errno = EAGAIN; return (-1); } | |
150 | D( fprintf(stderr, "userv answer was `%c'\n", ch); ) | |
151 | } else if (dlen != 1) { | |
152 | errno = EIO; | |
153 | return (-1); | |
154 | } | |
ca51b51d MW |
155 | *rc = ch; |
156 | return (1); | |
157 | } | |
158 | ||
dd1ee021 MW |
159 | /* --- @local@ --- * |
160 | * | |
161 | * Arguments: @int cdb@ = file descriptor for the CDB | |
162 | * @const char *l@ = pointer to local-part to look up | |
163 | * @int len@ = length of the local-part | |
164 | * @const char *sender@ = envelope sender address | |
165 | * @int *rc@ = where to put the answer | |
166 | * | |
167 | * Returns: Positive if answered, zero if lookup failed, negative on | |
168 | * error. | |
169 | * | |
170 | * Use: Finds out whether @l@ is a valid local-part for a non-virtual | |
171 | * mailbox name. Handles defaulting of extension addresses and | |
172 | * suchlike. | |
173 | */ | |
174 | ||
0a045fc1 MW |
175 | static int local(int cdb, const char *l, int len, |
176 | const char *sender, int *rc) | |
ca51b51d MW |
177 | { |
178 | int code; | |
179 | int err = 0; | |
180 | int dash; | |
181 | ||
0a045fc1 MW |
182 | if ((err = localprobe(cdb, sender, l, len, 0, l + len, &code)) != 0) |
183 | goto done; | |
ca51b51d MW |
184 | |
185 | for (;;) { | |
186 | dash = byte_rchr(l, len, '-'); | |
187 | if (dash == len) break; | |
0a045fc1 MW |
188 | if ((err = localprobe(cdb, sender, |
189 | l, dash, "-default", l + dash + 1, &code)) != 0) | |
190 | goto done; | |
ca51b51d MW |
191 | len = dash; |
192 | } | |
193 | *rc = 0; | |
194 | return (0); | |
195 | ||
196 | done: | |
197 | if (err >= 0) { | |
198 | switch (code) { | |
199 | case '+': *rc = 1; break; | |
200 | case '-': *rc = 0; break; | |
201 | default: errno = EINVAL; err = -1; break; | |
202 | } | |
203 | } | |
204 | return (err); | |
205 | } | |
206 | ||
dd1ee021 MW |
207 | /* --- @virt@ --- * |
208 | * | |
209 | * Arguments: @int cdb@ = file descriptor for CDB | |
210 | * @const char *u@ = the local-part of the recipient mailbox | |
211 | * @int ulen@ = length of the local-part | |
212 | * @const char *addr@ = the virtual domain to look up | |
213 | * @int alen@ = length of the virtual domain | |
214 | * @const char *sender@ = the envelope sender address | |
215 | * @int *rc@ = where to put the answer | |
216 | * | |
217 | * Returns: Positive if found, zero if not found, negative on error. | |
218 | * | |
219 | * Use: Looks up the address as a virtual domain. If found, the | |
220 | * local-part is appended to the local mailbox handling the | |
221 | * virtual domain and passed to @local@. | |
222 | */ | |
223 | ||
ca51b51d | 224 | static int virt(int cdb, const char *u, int ulen, |
0a045fc1 | 225 | const char *addr, int alen, const char *sender, int *rc) |
ca51b51d MW |
226 | { |
227 | static stralloc l = STRALLOC_INIT; | |
228 | uint32 dlen; | |
229 | int err; | |
230 | ||
0a045fc1 | 231 | if ((err = probe(cdb, 'V', addr, alen, 0, 0, &dlen)) <= 0) |
ca51b51d MW |
232 | return (err); |
233 | if (!stralloc_ready(&l, dlen + 1)) return (-1); | |
234 | if (read(cdb, l.s, dlen) != dlen) { errno = EIO; return (-1); } | |
235 | l.s[dlen] = '-'; | |
236 | l.len = dlen + 1; | |
0a045fc1 MW |
237 | if (!stralloc_catb(&l, u, ulen) || !stralloc_0(&l)) return (-1); |
238 | D( printf("*** virtual map -> `%s'\n", l.s); ) | |
239 | if (local(cdb, l.s, l.len - 1, sender, rc) < 0) return (-1); | |
ca51b51d MW |
240 | return (1); |
241 | } | |
242 | ||
dd1ee021 MW |
243 | /* --- @addrcheck@ --- * |
244 | * | |
245 | * Arguments: @int cdb@ = file descriptor for CDB to look things up in | |
246 | * @const char *addr@ = the (full) recipient mailbox to look up | |
247 | * @const char *sender@ = the (full) envelope sender address | |
248 | * @int *rc@ = where to put the answer. | |
249 | * | |
250 | * Returns: Nonnegative on success, or @-1@ on failure. | |
251 | * | |
252 | * Use: Determines whether @addr@ is a valid mailbox on this system, | |
253 | * by examining the given CDB file. On exit, @*rc@ is set to | |
254 | * @'+'@ if the mailbox is valid, or @'-'@ if not. | |
255 | */ | |
256 | ||
0a045fc1 | 257 | int addrcheck(int cdb, const char *addr, const char *sender, int *rc) |
ca51b51d MW |
258 | { |
259 | int at, len, dot; | |
260 | int err = 0; | |
261 | uint32 dlen; | |
c9d7c47d | 262 | static stralloc l = STRALLOC_INIT; |
ca51b51d MW |
263 | |
264 | len = str_len(addr); | |
265 | at = str_chr(addr, '@'); | |
266 | if (!addr[at]) | |
0a045fc1 | 267 | return (local(cdb, addr, len, sender, rc)); |
ca51b51d | 268 | |
0a045fc1 | 269 | if ((err = virt(cdb, addr, at, addr, len, sender, rc)) != 0) |
ca51b51d MW |
270 | return (err); |
271 | dot = at + 1; | |
272 | while (addr[dot]) { | |
0a045fc1 | 273 | if ((err = virt(cdb, addr, at, addr + dot, len - dot, sender, rc)) != 0) |
ca51b51d MW |
274 | return (err); |
275 | dot += byte_chr(addr + dot + 1, len - dot - 1, '.') + 1; | |
276 | } | |
277 | ||
0a045fc1 | 278 | if ((err = probe(cdb, '@', addr + at + 1, len - at - 1, 0, 0, &dlen)) < 0) |
ca51b51d MW |
279 | return (-1); |
280 | if (!err) { *rc = 1; return (0); } | |
281 | if (dlen != 0) { errno = EINVAL; return (-1); } | |
c9d7c47d MW |
282 | l.len = 0; |
283 | if (!stralloc_catb(&l, addr, at) || | |
284 | !stralloc_0(&l)) | |
285 | return (-1); | |
286 | return (local(cdb, l.s, l.len - 1, sender, rc)); | |
ca51b51d MW |
287 | } |
288 | ||
289 | #ifdef TEST | |
0a045fc1 | 290 | |
ca51b51d MW |
291 | #include <sys/types.h> |
292 | #include <unistd.h> | |
293 | #include <fcntl.h> | |
294 | #include <stdio.h> | |
295 | #include <errno.h> | |
296 | #include <unistd.h> | |
297 | ||
298 | int main(int argc, char *argv[]) | |
299 | { | |
300 | int fd; | |
301 | int rc; | |
302 | int i; | |
303 | ||
0a045fc1 MW |
304 | if (argc < 4) { |
305 | fprintf(stderr, "usage: addrcheck CDB SENDER ADDR...\n"); | |
ca51b51d MW |
306 | return (1); |
307 | } | |
308 | if ((fd = open(argv[1], O_RDONLY)) < 0) { | |
309 | perror(argv[1]); | |
310 | return (1); | |
311 | } | |
0a045fc1 MW |
312 | for (i = 3; i < argc; i++) { |
313 | if (addrcheck(fd, argv[i], argv[2], &rc) < 0) { | |
ca51b51d MW |
314 | perror("checking"); |
315 | return (1); | |
316 | } | |
317 | printf("%s: %s\n", argv[i], rc ? "ok" : "bad"); | |
318 | } | |
319 | return (0); | |
320 | } | |
321 | ||
322 | #endif |