/[smeserver]/rpms/headermatch/sme7/headermatch.c
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Contents of /rpms/headermatch/sme7/headermatch.c

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Revision 1.1 - (show annotations) (download)
Tue Jun 12 16:23:07 2007 UTC (17 years, 4 months ago) by slords
Branch: MAIN
CVS Tags: headermatch-0_0_1-3_el4_sme, HEAD
Content type: text/plain
Import on branch sme7 of package headermatch-0.0.1-3.el4.sme.src.rpm

1 /********
2 headermatch checks an rfc822 message on standard input for a matching
3 header, and exits 0 if finds a match, and 1 otherwise.
4
5 The header to match by default is "X-Spam-Flag: YES".
6 If a command line argument is given, its text is used
7 as the sorting header rather than "X-Spam-Flag: YES".
8
9 Note that standard input must be able to be mmaped(*) for the testing to
10 succeed - this will be the case when qmail-local is doing the delivery.
11 If mmap fails then headermatch exits with status 100.
12
13 (*) mmap was used so that there are no local buffers used in the program, so
14 that the program logic is very simple.
15
16 Copyright (C) 2006 Charlie Brady
17
18 This program is free software; you can redistribute it and/or modify
19 it under the terms of the GNU General Public License as published by
20 the Free Software Foundation; either version 2 of the License, or
21 (at your option) any later version.
22
23 This program is distributed in the hope that it will be useful,
24 but WITHOUT ANY WARRANTY; without even the implied warranty of
25 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 GNU General Public License for more details.
27
28 You should have received a copy of the GNU General Public License
29 along with this program; if not, write to the Free Software
30 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
31
32 ***********/
33
34 #include <sys/types.h>
35 #include <sys/stat.h>
36 #include <sys/mman.h>
37 #include <unistd.h>
38 #include <errno.h>
39
40 error(const char* s)
41 {
42 write(2, s, strlen(s));
43 write(2, "\n", 1);
44 }
45
46 char * find_str(const char* s, const long len, const char* pattern)
47 {
48 char* sptr;
49 size_t plen;
50 long slen;
51 char p;
52 if (*pattern == 0) return 0;
53 slen = len;
54 plen = strlen(pattern);
55 for (sptr = (char *)s; (p = *pattern) != 0; ++sptr, --slen)
56 {
57 if (*sptr == '\n')
58 {
59 sptr++;
60 slen--;
61 if (*sptr == '\n')
62 {
63 return 0;
64 }
65 if (slen < plen)
66 {
67 return 0;
68 }
69 if (!memcmp(sptr, pattern, (size_t)plen))
70 {
71 return sptr;
72 }
73 }
74 }
75 return 0;
76 }
77
78 int main(int argc, char **argv)
79 {
80 struct stat st;
81 char *message;
82 int fstat_ret;
83 char *end_of_headers;
84 char *spam_header = "X-Spam-Flag: YES";
85 size_t spam_header_len;
86 size_t message_len;
87
88 if (argc > 1)
89 {
90 spam_header = argv[1];
91 }
92 if (fstat_ret = fstat(0,&st))
93 {
94 error("Could not fstat standard input");
95 exit(111);
96 }
97 message_len = st.st_size;
98 spam_header_len = strlen(spam_header);
99 if (message_len < spam_header_len)
100 {
101 exit(99);
102 }
103 if (message_len > 0xffffffff)
104 {
105 error("Input file too big");
106 exit(100);
107 }
108 message = mmap(0,message_len,PROT_READ,MAP_SHARED,0,0);
109 if (message + 1)
110 {
111 if (!memcmp(message, spam_header, spam_header_len))
112 {
113 munmap(message, message_len);
114 exit(0);
115 }
116 if (find_str(message, message_len, spam_header))
117 {
118 munmap(message, message_len);
119 exit(0);
120 }
121 munmap(message, message_len);
122 exit(99);
123 }
124 error("MMap failed");
125 exit(100);
126 }

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