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1 | /* -*-c-*- |
2 | * |
9a4b2474 |
3 | * $Id: qmail-checkspam.c,v 1.2 2004/04/08 01:36:26 mdw Exp $ |
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4 | * |
5 | * Filter messages for spam |
6 | * |
7 | * (c) 2003 Mark Wooding |
8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This program 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. |
16 | * |
17 | * This program 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. |
21 | * |
22 | * You should have received a copy of the GNU General Public License |
23 | * along with this program; 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 <ctype.h> |
30 | #include <errno.h> |
31 | #include <stdio.h> |
32 | #include <stdlib.h> |
33 | #include <string.h> |
34 | |
35 | #include <sys/types.h> |
36 | #include <sys/unistd.h> |
37 | |
38 | #include <libspamc.h> |
39 | |
40 | /*----- Main code ---------------------------------------------------------*/ |
41 | |
42 | static const char *strenv(const char *e, const char *d) |
43 | { |
44 | const char *p = getenv(e); |
45 | if (!p) return (d); |
46 | return (p); |
47 | } |
48 | |
49 | static double dblenv(const char *e, double d) |
50 | { |
51 | const char *p = getenv(e); |
52 | char *q; |
53 | int err = errno; |
54 | double f; |
55 | if (!p) return (d); |
56 | errno = 0; |
57 | f = strtod(p, &q); |
58 | if (errno) return (d); |
59 | errno = err; |
60 | return (f); |
61 | } |
62 | |
63 | static int intenv(const char *e, int d) |
64 | { |
65 | const char *p = getenv(e); |
66 | char *q; |
67 | int err = errno; |
68 | long l; |
69 | if (!p) return (d); |
70 | errno = 0; |
71 | l = strtol(p, &q, 0); |
72 | if (errno) return (d); |
73 | errno = err; |
74 | if (l < 0 || l > INT_MAX) return (d); |
75 | return ((int)l); |
76 | } |
77 | |
78 | int shovel(int from, int to) |
79 | { |
80 | char buf[4096]; |
81 | ssize_t n; |
82 | char *p; |
83 | size_t r; |
84 | |
85 | for (;;) { |
86 | n = read(from, buf, sizeof(buf)); |
87 | if (n < 0 && errno != EINTR && errno != EAGAIN) |
88 | return (-1); |
89 | else if (!n) |
90 | return (0); |
91 | p = buf; |
92 | r = n; |
93 | while (r) { |
94 | n = write(to, p, n); |
95 | if (n <= 0 && errno != EINTR && errno != EAGAIN) |
96 | return (-1); |
97 | r -= n; |
98 | p += n; |
99 | } |
100 | } |
101 | } |
102 | |
103 | int main(int argc, char *argv[]) |
104 | { |
105 | struct sockaddr sa; |
106 | struct message m; |
107 | int fd_m[2], fd_e[2]; |
108 | pid_t kid; |
109 | int rc; |
110 | |
111 | m.max_len = intenv("QMAIL_CHECKSPAM_MAXLEN", 2 * 1024 * 1024); |
112 | m.timeout = intenv("QMAIL_CHECKSPAM_TIMEOUT", 300); |
113 | rc = message_read(0, 0, &m); |
114 | if (rc != 0 && rc != EX_TOOBIG) |
115 | return (54); |
116 | if (!rc) { |
117 | if (lookup_host(strenv("QMAIL_CHECKSPAM_SPAMDHOST", "localhost"), |
118 | intenv("QMAIL_CHECKSPAM_SPAMDPORT", 783), |
119 | &sa)) |
120 | return (56); |
121 | if (message_filter(&sa, "spamd", 0, &m)) |
122 | return (74); |
123 | if (m.score >= dblenv("QMAIL_CHECKSPAM_THRESH", m.threshold)) |
124 | return (31); |
125 | } |
126 | if (pipe(fd_m) || pipe(fd_e)) |
127 | return (56); |
128 | if ((kid = fork()) < 0) |
129 | return (56); |
130 | if (!kid) { |
131 | close(fd_m[0]); |
132 | close(fd_e[0]); |
133 | if (message_write(fd_m[1], &m) < 0) |
134 | _exit(127); |
135 | if (rc == EX_TOOBIG && shovel(0, fd_m[1])) |
136 | _exit(127); |
137 | close(fd_m[1]); |
138 | if (shovel(1, fd_e[1])) |
139 | _exit(127); |
140 | close(fd_e[1]); |
141 | _exit(0); |
142 | } |
143 | |
144 | dup2(fd_m[0], 0); |
145 | dup2(fd_e[0], 1); |
146 | close(fd_m[0]); |
147 | close(fd_e[0]); |
148 | close(fd_m[1]); |
149 | close(fd_e[1]); |
150 | execlp(strenv("QMAIL_CHECKSPAM_QUEUE", "/var/qmail/bin/qmail-queue"), |
151 | (char *)0); |
152 | fprintf(stderr, "failed to exec: %s\n", strerror(errno)); |
153 | return (56); |
154 | } |
155 | |
156 | /*----- That's all, folks -------------------------------------------------*/ |