8d769cc9 |
1 | /* -*-c-*- |
2 | * |
3 | * $Id: qmail-checkspam.c,v 1.1 2003/10/01 00:08:57 mdw Exp $ |
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 | |
27 | /*----- Revision history --------------------------------------------------* |
28 | * |
29 | * $Log: qmail-checkspam.c,v $ |
30 | * Revision 1.1 2003/10/01 00:08:57 mdw |
31 | * Collection of miscellaneous ill-documented tools. |
32 | * |
33 | */ |
34 | |
35 | /*----- Header files ------------------------------------------------------*/ |
36 | |
37 | #include <ctype.h> |
38 | #include <errno.h> |
39 | #include <stdio.h> |
40 | #include <stdlib.h> |
41 | #include <string.h> |
42 | |
43 | #include <sys/types.h> |
44 | #include <sys/unistd.h> |
45 | |
46 | #include <libspamc.h> |
47 | |
48 | /*----- Main code ---------------------------------------------------------*/ |
49 | |
50 | static const char *strenv(const char *e, const char *d) |
51 | { |
52 | const char *p = getenv(e); |
53 | if (!p) return (d); |
54 | return (p); |
55 | } |
56 | |
57 | static double dblenv(const char *e, double d) |
58 | { |
59 | const char *p = getenv(e); |
60 | char *q; |
61 | int err = errno; |
62 | double f; |
63 | if (!p) return (d); |
64 | errno = 0; |
65 | f = strtod(p, &q); |
66 | if (errno) return (d); |
67 | errno = err; |
68 | return (f); |
69 | } |
70 | |
71 | static int intenv(const char *e, int d) |
72 | { |
73 | const char *p = getenv(e); |
74 | char *q; |
75 | int err = errno; |
76 | long l; |
77 | if (!p) return (d); |
78 | errno = 0; |
79 | l = strtol(p, &q, 0); |
80 | if (errno) return (d); |
81 | errno = err; |
82 | if (l < 0 || l > INT_MAX) return (d); |
83 | return ((int)l); |
84 | } |
85 | |
86 | int shovel(int from, int to) |
87 | { |
88 | char buf[4096]; |
89 | ssize_t n; |
90 | char *p; |
91 | size_t r; |
92 | |
93 | for (;;) { |
94 | n = read(from, buf, sizeof(buf)); |
95 | if (n < 0 && errno != EINTR && errno != EAGAIN) |
96 | return (-1); |
97 | else if (!n) |
98 | return (0); |
99 | p = buf; |
100 | r = n; |
101 | while (r) { |
102 | n = write(to, p, n); |
103 | if (n <= 0 && errno != EINTR && errno != EAGAIN) |
104 | return (-1); |
105 | r -= n; |
106 | p += n; |
107 | } |
108 | } |
109 | } |
110 | |
111 | int main(int argc, char *argv[]) |
112 | { |
113 | struct sockaddr sa; |
114 | struct message m; |
115 | int fd_m[2], fd_e[2]; |
116 | pid_t kid; |
117 | int rc; |
118 | |
119 | m.max_len = intenv("QMAIL_CHECKSPAM_MAXLEN", 2 * 1024 * 1024); |
120 | m.timeout = intenv("QMAIL_CHECKSPAM_TIMEOUT", 300); |
121 | rc = message_read(0, 0, &m); |
122 | if (rc != 0 && rc != EX_TOOBIG) |
123 | return (54); |
124 | if (!rc) { |
125 | if (lookup_host(strenv("QMAIL_CHECKSPAM_SPAMDHOST", "localhost"), |
126 | intenv("QMAIL_CHECKSPAM_SPAMDPORT", 783), |
127 | &sa)) |
128 | return (56); |
129 | if (message_filter(&sa, "spamd", 0, &m)) |
130 | return (74); |
131 | if (m.score >= dblenv("QMAIL_CHECKSPAM_THRESH", m.threshold)) |
132 | return (31); |
133 | } |
134 | if (pipe(fd_m) || pipe(fd_e)) |
135 | return (56); |
136 | if ((kid = fork()) < 0) |
137 | return (56); |
138 | if (!kid) { |
139 | close(fd_m[0]); |
140 | close(fd_e[0]); |
141 | if (message_write(fd_m[1], &m) < 0) |
142 | _exit(127); |
143 | if (rc == EX_TOOBIG && shovel(0, fd_m[1])) |
144 | _exit(127); |
145 | close(fd_m[1]); |
146 | if (shovel(1, fd_e[1])) |
147 | _exit(127); |
148 | close(fd_e[1]); |
149 | _exit(0); |
150 | } |
151 | |
152 | dup2(fd_m[0], 0); |
153 | dup2(fd_e[0], 1); |
154 | close(fd_m[0]); |
155 | close(fd_e[0]); |
156 | close(fd_m[1]); |
157 | close(fd_e[1]); |
158 | execlp(strenv("QMAIL_CHECKSPAM_QUEUE", "/var/qmail/bin/qmail-queue"), |
159 | (char *)0); |
160 | fprintf(stderr, "failed to exec: %s\n", strerror(errno)); |
161 | return (56); |
162 | } |
163 | |
164 | /*----- That's all, folks -------------------------------------------------*/ |