127 lines
3.0 KiB (Stored with Git LFS)
C
127 lines
3.0 KiB (Stored with Git LFS)
C
/********
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headermatch checks an rfc822 message on standard input for a matching
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header, and exits 0 if finds a match, and 1 otherwise.
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The header to match by default is "X-Spam-Flag: YES".
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If a command line argument is given, its text is used
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as the sorting header rather than "X-Spam-Flag: YES".
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Note that standard input must be able to be mmaped(*) for the testing to
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succeed - this will be the case when qmail-local is doing the delivery.
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If mmap fails then headermatch exits with status 100.
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(*) mmap was used so that there are no local buffers used in the program, so
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that the program logic is very simple.
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Copyright (C) 2006 Charlie Brady
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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***********/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <unistd.h>
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#include <errno.h>
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error(const char* s)
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{
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write(2, s, strlen(s));
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write(2, "\n", 1);
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}
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char * find_str(const char* s, const long len, const char* pattern)
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{
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char* sptr;
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size_t plen;
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long slen;
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char p;
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if (*pattern == 0) return 0;
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slen = len;
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plen = strlen(pattern);
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for (sptr = (char *)s; (p = *pattern) != 0; ++sptr, --slen)
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{
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if (*sptr == '\n')
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{
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sptr++;
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slen--;
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if (*sptr == '\n')
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{
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return 0;
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}
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if (slen < plen)
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{
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return 0;
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}
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if (!memcmp(sptr, pattern, (size_t)plen))
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{
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return sptr;
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}
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}
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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struct stat st;
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char *message;
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int fstat_ret;
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char *end_of_headers;
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char *spam_header = "X-Spam-Flag: YES";
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size_t spam_header_len;
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size_t message_len;
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if (argc > 1)
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{
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spam_header = argv[1];
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}
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if (fstat_ret = fstat(0,&st))
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{
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error("Could not fstat standard input");
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exit(111);
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}
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message_len = st.st_size;
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spam_header_len = strlen(spam_header);
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if (message_len < spam_header_len)
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{
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exit(99);
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}
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if (message_len > 0xffffffff)
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{
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error("Input file too big");
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exit(100);
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}
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message = mmap(0,message_len,PROT_READ,MAP_SHARED,0,0);
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if (message + 1)
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{
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if (!memcmp(message, spam_header, spam_header_len))
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{
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munmap(message, message_len);
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exit(0);
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}
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if (find_str(message, message_len, spam_header))
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{
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munmap(message, message_len);
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exit(0);
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}
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munmap(message, message_len);
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exit(99);
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}
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error("MMap failed");
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exit(100);
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}
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