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2 commits
| Author | SHA1 | Date | |
|---|---|---|---|
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3383197b13 | ||
| d420bdbc06 |
3 changed files with 29 additions and 250 deletions
10
.github/workflows/ci.yml
vendored
10
.github/workflows/ci.yml
vendored
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@ -30,7 +30,7 @@ jobs:
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strategy:
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fail-fast: false
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matrix:
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name: [ "macOS (x86_64)", "macOS (arm64)", "iOS", "Linux (x86_64)", "Linux (arm64)" ] # Android, Windows (x86_64), Windows (arm64)
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name: [ "macOS (x86_64)", "macOS (arm64)", "iOS", "Linux (x86_64)", "Linux (arm64)", "Windows (x86_64)" ] # Android, Windows (x86_64), Windows (arm64)
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include:
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- name: macOS (x86_64)
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platform: macos
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@ -56,10 +56,10 @@ jobs:
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# platform: android
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# runs-on: macos-latest
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# archs: auto
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# - name: Windows (x86_64)
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# platform: windows
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# runs-on: windows-latest
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# archs: auto
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- name: Windows (x86_64)
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platform: windows
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runs-on: windows-latest
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archs: auto
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# - name: Windows (arm64)
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# platform: windows
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# runs-on: windows-latest-arm??
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@ -14,7 +14,6 @@
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*/
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#include <stdio.h>
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#include <unistd.h>
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#include <stdlib.h>
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/* edit_dist -- returns the minimum edit distance between two strings
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268
src/spamsum.c
268
src/spamsum.c
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@ -1,30 +1,39 @@
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/*
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this is a checksum routine that is specifically designed for spam.
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Copyright Andrew Tridgell <tridge@samba.org> 2002
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this is a checksum routine that is specifically designed for spam. Copyright
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Andrew Tridgell <tridge@samba.org> 2002
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This code is released under the GNU General Public License version 2
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or later. Alternatively, you may also use this code under the terms
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of the Perl Artistic license.
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This code is released under the GNU General Public License version 2 or later.
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Alternatively, you may also use this code under the terms of the Perl Artistic
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license.
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If you wish to distribute this code under the terms of a different
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free software license then please ask me. If there is a good reason
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then I will probably say yes.
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If you wish to distribute this code under the terms of a different free
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software license then please ask me. If there is a good reason then I will
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probably say yes.
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---
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Modified by Russell Keith-Magee, 20 Jan 2009:
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* removed the condition preventing comparison of small block sizes
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(lines 364-366)
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* Modified the help string to be legal cross platform C.
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Original sources can be found at:
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https://www.samba.org/ftp/unpacked/junkcode/spamsum/
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Changes from the original:
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20 Jan 2009:
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* Removed the condition preventing comparison of small block sizes (lines
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364-366)
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* Modified the help string to be legal cross platform C.
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20 Feb 2025:
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* Removed the spamsum_match_db, spamsum_stdin, spamsum_file, and mainline
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entry points, plus imports required by those methods. These methods were
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not exposed by the Python binding, and were problematic for Windows support.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <fcntl.h>
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#include <errno.h>
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#include <sys/mman.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <ctype.h>
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/* the output is a string of length 64 in base64 */
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@ -448,232 +457,3 @@ u32 spamsum_match(const char *str1, const char *str2)
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return score;
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}
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/*
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return the maximum match for a file containing a list of spamsums
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*/
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u32 spamsum_match_db(const char *fname, const char *sum, u32 threshold)
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{
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FILE *f;
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char line[100];
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u32 best = 0;
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f = fopen(fname, "r");
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if (!f) return 0;
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/* on each line of the database we compute the spamsum match
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score. We then pick the best score */
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while (fgets(line, sizeof(line)-1, f)) {
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u32 score;
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int len;
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len = strlen(line);
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if (line[len-1] == '\n') line[len-1] = 0;
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score = spamsum_match(sum, line);
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if (score > best) {
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best = score;
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if (best >= threshold) break;
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}
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}
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fclose(f);
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return best;
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}
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/*
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return the spamsum on stdin
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*/
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static char *spamsum_stdin(u32 flags, u32 block_size)
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{
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uchar buf[10*1024];
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uchar *msg;
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u32 length = 0;
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int n;
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char *sum;
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msg = malloc(sizeof(buf));
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if (!msg) return NULL;
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/* load the file, expanding the allocation as needed. */
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while (1) {
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n = read(0, buf, sizeof(buf));
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if (n == -1 && errno == EINTR) continue;
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if (n <= 0) break;
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msg = realloc(msg, length + n);
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if (!msg) return NULL;
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memcpy(msg+length, buf, n);
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length += n;
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}
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sum = spamsum(msg, length, flags, block_size);
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free(msg);
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return sum;
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}
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/*
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return the spamsum on a file
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*/
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char *spamsum_file(const char *fname, u32 flags, u32 block_size)
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{
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int fd;
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char *sum;
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struct stat st;
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uchar *msg;
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if (strcmp(fname, "-") == 0) {
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return spamsum_stdin(flags, block_size);
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}
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fd = open(fname, O_RDONLY);
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if (fd == -1) {
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perror(fname);
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return NULL;
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}
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if (fstat(fd, &st) == -1) {
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perror("fstat");
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return NULL;
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}
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msg = mmap(NULL, st.st_size, PROT_READ, MAP_FILE|MAP_PRIVATE, fd, 0);
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if (msg == (uchar *)-1) {
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perror("mmap");
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return NULL;
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}
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close(fd);
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sum = spamsum(msg, st.st_size, flags, block_size);
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munmap(msg, st.st_size);
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return sum;
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}
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static void show_help(void)
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{
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printf("\n\
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spamsum v1.1 written by Andrew Tridgell <tridge@samba.org>\n\
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\n\
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spamsum computes a signature string that is particular good for detecting if two emails\n\
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are very similar. This can be used to detect SPAM.\n\
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\n\
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Syntax:\n\
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spamsum [options] <files>\n\
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or\n\
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spamsum [options] -d sigs.txt -c SIG\n\
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or\n\
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spamsum [options] -d sigs.txt -C file\n\
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\n\
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When called with a list of filenames spamsum will write out the\n\
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signatures of each file on a separate line. You can specify the\n\
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filename '-' for standard input.\n\
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\n\
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When called with the second form, spamsum will print the best score\n\
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for the given signature with the signatures in the given database. A\n\
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score of 100 means a perfect match, and a score of 0 means a complete\n\
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mismatch.\n\
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\n\
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When checking, spamsum returns 0 (success) when the message *is* spam,\n\
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1 for internal errors, and 2 for messages whose signature is not\n\
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found.\n\
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\n\
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The 3rd form is just like the second form, but you pass a file\n\
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containing a message instead of a pre-computed signature.\n\
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\n\
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Options:\n\
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-W ignore whitespace\n\
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-H skip past mail headers\n\
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-B <bsize> force a block size of bsize\n\
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-T <threshold> set the threshold above which spamsum will stop\n\
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looking (default 90)\n\
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");
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}
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int main(int argc, char *argv[])
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{
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char *sum;
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extern char *optarg;
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extern int optind;
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int c;
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char *dbname = NULL;
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u32 score;
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int i;
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u32 flags = 0;
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u32 block_size = 0;
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u32 threshold = 90;
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while ((c = getopt(argc, argv, "B:WHd:c:C:hT:")) != -1) {
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switch (c) {
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case 'W':
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flags |= FLAG_IGNORE_WHITESPACE;
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break;
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case 'H':
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flags |= FLAG_IGNORE_HEADERS;
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break;
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case 'd':
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dbname = optarg;
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break;
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case 'B':
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block_size = atoi(optarg);
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break;
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case 'T':
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threshold = atoi(optarg);
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break;
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case 'c':
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if (!dbname) {
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show_help();
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exit(1);
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}
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score = spamsum_match_db(dbname, optarg,
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threshold);
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printf("%u\n", score);
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exit(score >= threshold ? 0 : 2);
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case 'C':
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if (!dbname) {
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show_help();
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exit(1);
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}
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score = spamsum_match_db(dbname,
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spamsum_file(optarg, flags,
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block_size),
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threshold);
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printf("%u\n", score);
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exit(score >= threshold ? 0 : 2);
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case 'h':
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default:
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show_help();
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exit(0);
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}
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}
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argc -= optind;
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argv += optind;
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if (argc == 0) {
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show_help();
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return 0;
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}
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/* compute the spamsum on a list of files */
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for (i=0;i<argc;i++) {
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sum = spamsum_file(argv[i], flags, block_size);
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printf("%s\n", sum);
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free(sum);
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}
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return 0;
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}
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