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BDIR := bin
PROJ := FindPatterns
FILES := findpat
OBJS := $(patsubst %,$(BDIR)/%.o,$(FILES))
SRCS := $(patsubst %,%.c,$(FILES))
H := $(patsubst %,%.h,$(FILES))
CC := gcc
OF := -Wall -O3 -fasm -fomit-frame-pointer -ffast-math -funroll-loops -fasm -fomit-frame-pointer -ffast-math -funroll-loops -pedantic -ansi
CF := -Wall -O3 -fasm -fomit-frame-pointer -ffast-math -funroll-loops -fasm -fomit-frame-pointer -ffast-math -funroll-loops -pedantic -ansi
default: $(BDIR)/$(PROJ)
$(BDIR)/$(PROJ): $(OBJS)
$(CC) $(OF) $(CF) $^ -o $@
$(BDIR)/%.o: %.c
$(CC) $(OF) -c $< -o $@
.PHONY: clean
clean:
-rm $(OBJS)

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This came in 2006 after attending a talk on bioinformatics.
I had the idea of making an email client that would take the
methods of bioinformatics and apply them to spam-detection.
</p>
<p>
Searches through input and outputs sequences that are repeated.
Because it's intended for text files, control characters are
ignored.
</p>
<p>
FindPatterns [filename] [-b] [-e] [-i] [-o] [-v] [-m&lt;n&gt;] [-l&lt;n&gt;] [-g&lt;n&gt;] [-?|h]
</p>
<dl>
<dt>filename</dt><dd>Attempt to read input from this file, otherwise uses stdin.</dd>
<dt>-b</dt><dd>Keep a buffer to count repeated matches (!o -> b.)</dd>
<dt>-e</dt><dd>Echo input.</dd>
<dt>-i</dt><dd>Case-insensitive (not implemented.)</dd>
<dt>-n</dt><dd>Don't display matches at the end.</dd>
<dt>-o</dt><dd>Output matches immediately as they are found.</dd>
<dt>-s</dt><dd>Silent mode - plain output with no extra characters.</dd>
<dt>-v</dt><dd>Verbose comments while outputting.</dd>
<dt>-g&lt;n&gt;</dt><dd>Set memory buffer granularity to the closest power of two
lower than &lt;n&gt; bytes (default 1024.)</dd>
<dt>-l&lt;n&gt;</dt><dd>Set match limit to &lt;n&gt; matches (default 4096; 0 -&gt; no limit.)</dd>
<dt>-m&lt;n&gt;</dt><dd>Set minimum match length to &lt;n&gt; symbols (default 3).</dd>
<dt>-?|h</dt><dd>Display this help screen and exit.</dd>
</dl>
<p>
Adding -&lt;s&gt;- will turn off switch &lt;s&gt;.
</p>
<p>
Also included is a simple KillSpam email client that takes the patterns
generated (from FindPatterns) and eliminates all the emails that have
matching patterns.

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Copyright (C) 2006 Neil Edelman
Find Patterns is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Find Patterns (see gnu.txt.) If not, see
<http://www.gnu.org/licenses/>.

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/* Copyright 2006 Neil Edelman, distributed under the terms of the
GNU General Public License, see copying.txt */
/* Sunday, April 2, 2006 */
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
/* constants */
static const char *programme = "Find Patterns";
static const char *year = "2006";
static const int versionMajor = 1;
static const int versionMinor = 0;
typedef struct TAG_match_t {
unsigned long next;
unsigned long pos;
unsigned long len;
unsigned long count;
} match_t;
int main(int argc, char **argv);
void set_binary_switch_string(int argc, char **argv, char *flagStr, unsigned long *bvPtr);
unsigned short set_ulong_flag(int argc, char **argv, char flagChar, unsigned long *lPtr);
char *get_unswitched_arg(int argc, char **argv, unsigned int argNo);
#define MATCHBUF 1
#define ECHO 2
#define NOCASE 4
#define NOSHOWBUF 8
#define INTERACTIVE 16
#define SILENT 32
#define VERBOSE 64
#define HELP (128 | 256)
#define DEF_MATCHLIMIT 4096
#define DEF_MINLENGTH 3
#define DEF_MEMGRAN 1024
int main(int argc, char **argv) {
match_t *matchBuf = 0;
FILE *in;
size_t matchBufSize = 0, matchBufPos = 0;
size_t bufSize, bufPos;
unsigned long hiPos, loPos, hiDat, loDat, firstMatch = ULONG_MAX, numMatches;
unsigned long flags = 0, matchLimit = DEF_MATCHLIMIT, minLength = DEF_MINLENGTH, memGran = DEF_MEMGRAN, matchMemGran;
int readValue;
unsigned short matched, worked = 1;
char *buf = 0, ch, *filename = 0;
/* skip the first command argument */
argv++; if(--argc < 0) { printf("Invoked with erreneous argument data (%d arguments.)\n", argc); return 3; }
/* check for the binary flags */
set_binary_switch_string(argc, argv, "beinosvh?", &flags);
if(flags & HELP) {
/* "________________________________________________________________________________" */
fprintf(stderr, "Version %d.%d.\n\n", versionMajor, versionMinor);
fprintf(stderr, "%s Copyright %s Neil Edelman\n", programme, year);
fprintf(stderr, "This program comes with ABSOLUTELY NO WARRANTY.\n");
fprintf(stderr, "This is free software, and you are welcome to redistribute it\n");
fprintf(stderr, "under certain conditions; see copying.txt.\n\n");
printf("Searches through input and outputs sequences that are repeated. Because it's\n");
printf("intended for text files, control characters are ignored.\n\n");
printf("FINDPAT [filename] [-b] [-e] [-i] [-o] [-v] [-m<n>] [-l<n>] [-g<n>] [-?|h]\n\n");
printf(" filename Attempt to read input from this file, otherwise uses stdin.\n");
printf(" -b Keep a buffer to count repeated matches (!o -> b.)\n");
printf(" -e Echo input.\n");
printf(" -i Case-insensitive (not implemented.)\n");
printf(" -n Don't display matches at the end.\n");
printf(" -o Output matches immediately as they are found.\n");
printf(" -s Silent mode - plain output with no extra characters.\n");
printf(" -v Verbose comments while outputting.\n");
printf(" -g<n> Set memory buffer granularity to the closest power of two\n");
printf(" lower than <n> bytes (default 1024.)\n");
printf(" -l<n> Set match limit to <n> matches (default 4096; 0 -> no limit.)\n");
printf(" -m<n> Set minimum match length to <n> symbols (default 3).\n");
printf(" -?|h Display this help screen and exit.\n\n");
printf(" Adding -<s>- will turn off switch <s>.\n");
return 1;
}
if(!(flags & INTERACTIVE)) { flags |= MATCHBUF; }
if((flags & VERBOSE)) printf("Octal flags: 0%o.\n", (unsigned int)flags);
/* set memory buffer granularity (make it a power of two) and make matchMemGran memGran / sizeof(match_t) */
set_ulong_flag(argc, argv, 'g', &memGran);
{ unsigned int memPower; for(memPower = 0; memGran >>= 1; memPower++); memGran = 1 << memPower; }
if(memGran > 16) matchMemGran = memGran >> 4; else matchMemGran = 1;
if((flags & VERBOSE)) printf("Allocation granularity: %u.\n", (unsigned int)memGran);
/* set the limit on the number of matches */
set_ulong_flag(argc, argv, 'l', &matchLimit);
if((flags & VERBOSE)) printf("Match limit: %u.\n", (unsigned int)matchLimit);
/* get the minimum match length */
set_ulong_flag(argc, argv, 'm', &minLength);
if(!minLength) minLength = 1;
if((flags & VERBOSE)) printf("Minimum length: %u.\n", (unsigned int)minLength);
/* get the filename for input */
if((filename = get_unswitched_arg(argc, argv, 0))) {
if(!(in = fopen(filename, "r")))
{ printf("Error opening file \"%s\" for reading.\n", filename); return 2; }
}
else if(!(in = stdin))
{ printf("Error reading from stdin.\n"); return 2; }
if((flags & VERBOSE) && filename) printf("Opened file \"%s\" at %p.\n", filename, (void *)in);
/* explain what's going on so those who unwittingly run the app won't get stuck */
if(!(flags & SILENT)) printf("Finding repeated substrings; EOF (UNIX Ctrl-D, DOS Ctrl-Z.) to end.\n");
/* run through the buffer, expanding and filling it with input as it goes */
for(bufSize = 0, bufPos = 0, numMatches = 0; ; bufPos++) {
/* read in a byte */
if((readValue = fgetc(in)) == EOF) break;
/* haha, binary mode - I don't see how this could possibly be useful */
/* if(readValue < 0 || readValue > UCHAR_MAX) continue; */
/* since this is text mode, ignore control characters */
if(readValue < ' ' || readValue > '~') continue;
/* assign the inputed int to a char to save on repeated conversions */
ch = (char)readValue;
if((flags & ECHO)) putchar(ch);
/* make sure the buffer size isn't going to exceed the limits of the data type */
if(bufPos + 2 >= ULONG_MAX - 1)
{ printf("Exceeded maximum data modulus of %u.", (unsigned int)ULONG_MAX - 1); worked = 0; break; }
/* expand the buffer if required */
if(bufPos + 2 >= bufSize) {
bufSize = ((bufPos + 2) & ~(memGran - 1)) + memGran;
if(!(buf = (char *)realloc((void *)buf, sizeof(char) * bufSize)))
{ printf("Ran out of memory allocating %u bytes.\n", (unsigned int)(sizeof(char) * bufSize)); worked = 0; break; }
else if((flags & VERBOSE)) printf("Input buffer sized to %u characters (%u bytes) at %p.\n", (unsigned int)bufSize, (unsigned int)(sizeof(char) * bufSize), buf);
}
/* write the symbol to the buffer with a null after it for string output */
buf[bufPos] = (char)ch;
buf[bufPos + 1] = 0;
/* starting at or past half way through the buffer and work towards the
end; yes, the + 1 is right not + (bufPos & 1); think zero-offset */
for(hiPos = (bufPos >> 1) + 1; hiPos + minLength - 1 <= bufPos; hiPos++) {
/* initial flags no match */
matched = 0;
/* search forwards from the buffer start up to the last point where
a full match might exist with the hi sequence */
for(loPos = 0; loPos < hiPos - (bufPos - hiPos); loPos++) {
/* search through the entire hi and lo sequences for a match */
for(hiDat = hiPos, loDat = loPos; ; hiDat++, loDat++) {
/* break on a non-match FIXME: add a case-insensitive version */
if(buf[hiDat] != buf[loDat]) break;
/* if at the end, the whole thing matched */
if(hiDat >= bufPos) { matched = 1; break; }
}
/* check if the above resulted in a full match */
if(matched) {
match_t match;
/* check if this match is the same as the previous match */
/* don't exceed the limit */
if(matchLimit && numMatches++ >= matchLimit)
{ printf("Match limit of %u exceeded.\n", (unsigned int)matchLimit); worked = 0; break; }
/* fill in info about the match */
match.pos = loPos;
match.len = 1 + bufPos - hiPos;
if((flags & INTERACTIVE)) printf("<%-*.*s", (int)match.len, (int)match.len, buf + match.pos);
/* if there's a match buffer, put the match into it */
if((flags & MATCHBUF)) {
unsigned long node, prevNode;
/* skip past all matches up to this position */
for(matched = 0, node = firstMatch, prevNode = ULONG_MAX; node != ULONG_MAX; prevNode = node, node = matchBuf[node].next) {
/* skip past all earlier positions */
if(matchBuf[node].pos < match.pos) continue;
/* no match if the next position is later */
if(matchBuf[node].pos > match.pos) break;
/* otherwise, this position must have matched */
matched = 1; break;
}
if(matched) {
/* skip past all matches up to this length FIXME: 1 unneccessary test for if(node) and unneccesary assignment of prevNode */
for(matched = 0; node != ULONG_MAX; prevNode = node, node = matchBuf[node].next) {
/* skip past all smaller lengths */
if(matchBuf[node].len < match.len) continue;
/* no match if the next length is larger */
if(matchBuf[node].len > match.len) break;
/* otherwise, this length must have matched */
matched = 1; break;
}
}
/* if the length and position of both matches are the same, increment the existing match count */
if(matched) matchBuf[node].count++;
/* otherwise, a new match must be created */
else {
match_t *newMatch;
/* make sure the buffer size isn't going to exceed the limits of the data type */
if(matchBufPos + 1 >= ULONG_MAX - 1) /* need the -1 because ULONG_MAX is a NULL flag */
{ printf("Match buffer exceeded maximum data modulus of %u.", (unsigned int)ULONG_MAX - 1); worked = 0; break; }
/* expand the buffer if required */
if(matchBufPos + 1 >= matchBufSize) {
matchBufSize = ((matchBufPos + 1) & ~(matchMemGran - 1)) + matchMemGran;
if(!(matchBuf = (match_t *)realloc((void *)matchBuf, sizeof(match_t) * matchBufSize)))
{ printf("Ran out of memory allocating %u bytes.\n", (unsigned int)(sizeof(match_t) * matchBufSize)); worked = 0; break; }
else if((flags & VERBOSE)) printf("Match buffer sized to %u matches (%u bytes) at %p.\n", (unsigned int)matchBufSize, (unsigned int)(sizeof(match_t) * matchBufSize), (void *)matchBuf);
}
/* get the address of the new match and move ahead for next time */
newMatch = matchBuf + matchBufPos++;
/* copy the match info into the new node */
newMatch->pos = match.pos; newMatch->len = match.len; newMatch->count = 1;
/* insert into the linked list */
if(prevNode != ULONG_MAX) { newMatch->next = matchBuf[prevNode].next; matchBuf[prevNode].next = matchBufPos - 1; }
else { newMatch->next = firstMatch; firstMatch = matchBufPos - 1; }
}
if((flags & INTERACTIVE)) printf("|#%u>\n", (unsigned int)matchBuf[node].count);
}
/* if there is no match buffer */
else if((flags & INTERACTIVE)) printf(">\n");
/* all other matches will have already been listed from
previous searches so stop looking */
break;
}
/* make sure everything is still working */
if(!worked) break;
}
/* make sure everything is still working */
if(!worked) break;
}
/* make sure everything is still working */
if(!worked) break;
}
/* if the buffer exists */
if(matchBuf) {
unsigned long node;
/* FIXME: filter out substrings of matches that match the same as the whole string */
for(node = firstMatch; node != ULONG_MAX; node = matchBuf[node].next) {
}
/* print out the results */
if(!(flags & NOSHOWBUF)) {
if((flags & SILENT))
{ for(node = firstMatch; node != ULONG_MAX; node = matchBuf[node].next) printf("%-*.*s\n", (int)matchBuf[node].len, (int)matchBuf[node].len, buf + matchBuf[node].pos); }
else
{ for(node = firstMatch; node != ULONG_MAX; node = matchBuf[node].next) printf("%u*<%-*.*s>@%u\n", (unsigned int)matchBuf[node].count, (int)matchBuf[node].len, (int)matchBuf[node].len, buf + matchBuf[node].pos, (unsigned int)matchBuf[node].pos); }
}
/* free the buffer */
if((flags & VERBOSE)) printf("Freeing match buffer at %p.\n", (void *)matchBuf);
free(matchBuf);
}
/* free the memory allocated to the buffer */
if(buf) { if((flags & VERBOSE)) printf("Freeing input buffer at %p.\n", buf); free(buf); }
/* close the file */
if(filename) { if((flags & VERBOSE)) printf("Closing input file at %p.\n", (void *)in); fclose(in); }
/* return the error state */
if(worked) return 0; else return 1;
}
void set_binary_switch_string(int argc, char **argv, char *flagStr, unsigned long *bvPtr) {
unsigned long mask;
int i;
char **arg, *str, *flagPos;
/* go through all the argv's */
for(i = argc, arg = argv; i > 0; i--, arg++) {
/* this argument looks like -a... or /a... */
if((*(str = *arg) == '-' || *str == '/') && *(++str)) {
/* looks like /a -a /a+ or -a+ */
if(!str[1] || str[1] == '+') {
for(mask = 1, flagPos = flagStr; *flagPos && mask; flagPos++, mask <<= 1)
{ if(*str == *flagPos) { *bvPtr |= mask; break; } }
}
/* looks like /a- or -a- */
else if(str[1] == '-') {
for(mask = 1, flagPos = flagStr; *flagPos && mask; flagPos++, mask <<= 1)
{ if(*str == *flagPos) { *bvPtr &= ~mask; break; } }
}
}
}
}
unsigned short set_ulong_flag(int argc, char **argv, char flagChar, unsigned long *lPtr) {
unsigned long num;
int i;
unsigned short gotNum = 0;
char **arg, *str, *end;
/* go through all the argv's */
for(i = argc, arg = argv; i > 0; i--, arg++) {
str = *arg;
/* looks like -fa... or /fa... */
if((*str == '-' || *str == '/') && *(++str) == flagChar && *(++str))
{ num = strtoul(str, &end, 0); if(!*end) { *lPtr = num; gotNum = 1; } }
}
return gotNum;
}
char *get_unswitched_arg(int argc, char **argv, unsigned int argNo) {
int i;
char **arg, *str;
/* go through all the argv's */
for(i = argc, arg = argv; i > 0; i--, arg++) {
/* this argument exists, doesn't look like -... or /..., and is no. argNo to be so */
if(*(str = *arg) && *str != '/' && *str != '-' && !argNo--) return str;
}
return 0;
}

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GNU GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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software and other kinds of works.
The licenses for most software and other practical works are designed
to take away your freedom to share and change the works. By contrast,
the GNU General Public License is intended to guarantee your freedom to
share and change all versions of a program--to make sure it remains free
software for all its users. We, the Free Software Foundation, use the
GNU General Public License for most of our software; it applies also to
any other work released this way by its authors. You can apply it to
your programs, too.
When we speak of free software, we are referring to freedom, not
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have the freedom to distribute copies of free software (and charge for
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To protect your rights, we need to prevent others from denying you
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For example, if you distribute copies of such a program, whether
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Developers that use the GNU GPL protect your rights with two steps:
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For the developers' and authors' protection, the GPL clearly explains
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#define IDI_DEATH 128

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#include "deathico.h"
IDI_DEATH ICON "death.ico"

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/* Copyright 2006 Neil Edelman, distributed under the terms of the
GNU General Public License, see copying.txt */
/* this is a LCC-WIN32 mail programme that goes with Find Patterns */
#include <stdlib.h> /* atoi(), getenv(), malloc(), free() */
#include <string.h> /* memcpy(), strchr() */
#include <stdio.h> /* printf() */
#include <conio.h> /* getch() */
#include <regexp.h> /* I'm lazy so I'll use LCC-WIN32's regexps */
#include "net.h"
#define MAX_REGX_SIZE 0x4000
#define BUF_SIZE 256
#define LOG_FILE_NAME "email"
#define SPAM_FILE_NAME "spamregx"
#define SPAM_ENV_VAR "SPAMREGX"
static const char *programme = "Vindicator";
static const char *year = "2006";
static const int versionMajor = 0;
static const int versionMinor = 1;
typedef struct tagMailSession {
enum {
WAIT_GREET,
WAIT_USEROK,
WAIT_PASSOK,
WAIT_STAT,
CHECKA_EMAIL,
WAIT_RETROK,
PARSE_DATA,
WAIT_DELEOK,
RUN_AWAY
} state;
int mailPos;
int mailCount;
int spamFactor;
unsigned int lnSize;
char line[BUF_SIZE];
unsigned int rpSize;
char resp[BUF_SIZE];
FILE *log;
regexp *subjRe;
regexp *fromRe;
regexp *spamRe;
} MailSession;
static MailSession *create_mail_session(void);
static void destroy_mail_session(MailSession *ms);
static int check_email(MailSession *ms, Net *net, char *name, unsigned int port);
static int get_response(MailSession *ms);
static int getstr(char **buf, int size, int echo);
int main(int argc, char **argv) {
Net *net;
MailSession *ms;
int ret, port;
char *server;
printf("%s\n\n", programme);
if(argc <= 1) {
printf("Arguments: [<server> [<port>]]\n\n");
printf("Connects to <server> (default localhost) on port <port> (default 110)\n");
printf("retreives emails, logging them into \"%s\" if it exists. If the\n", LOG_FILE_NAME);
printf("environment variable \"%s\" is defined or the file \"%s\"\n", SPAM_ENV_VAR, SPAM_FILE_NAME);
printf("exists, it loads the a regexp from them. Any emails matching the regexp\n");
printf("can then be annihilated.\n\n");
fprintf(stderr, "Version %d.%d.\n\n", versionMajor, versionMinor);
fprintf(stderr, "%s Copyright %s Neil Edelman\n", programme, year);
fprintf(stderr, "This program comes with ABSOLUTELY NO WARRANTY.\n");
fprintf(stderr, "This is free software, and you are welcome to redistribute it\n");
fprintf(stderr, "under certain conditions; see copying.txt.\n\n");
return 1;
}
port = (argc >= 3) ? atoi(argv[2]) : 110;
server = (argc >= 2) ? argv[1] : "localhost";
if(!(net = create_net(1024))) {
printf("Failed creating connection data.\n");
return 1;
}
if(!(ms = create_mail_session())) {
printf("Failed creating e-mail session data.\n");
destroy_net(net);
return 1;
}
ret = check_email(ms, net, server, port);
destroy_mail_session(ms);
destroy_net(net);
return ret ? 0 : 1;
}
static MailSession *create_mail_session(void) {
MailSession *ms;
/* create and initialize the memory space */
if(!(ms = malloc(sizeof(MailSession)))) {
perror("Error allocating memory for e-mail data.\n");
return 0;
}
printf("Created mail session data.\n");
ms->state = WAIT_GREET;
ms->mailPos = 1;
ms->mailCount = 0;
/* open the log file */
if(!(ms->log = fopen(LOG_FILE_NAME, "r"))) {
perror("Didn't find log file");
printf("To log email, create a file nammed \"%s.\"\n", LOG_FILE_NAME);
} else {
fclose(ms->log);
if(!(ms->log = fopen(LOG_FILE_NAME, "w")))
perror("Failed opening log file");
else
printf("Opened log file, \"%s,\" for writing.\n", LOG_FILE_NAME);
}
if(!(ms->subjRe = regcomp("^[Ss]ubject: ")))
printf("Error compiling subject regexp.\n");
if(!(ms->fromRe = regcomp("^[Ff]rom: ")))
printf("Error compiling sender regexp.\n");
ms->spamRe = 0;
/* read in the spam regexp */
{
FILE *fp = 0;
int len;
char regStr[MAX_REGX_SIZE] /* YIKES! */, *regPtr;
if(!(regPtr = getenv(SPAM_ENV_VAR))
&& !(fp = fopen(SPAM_FILE_NAME, "r"))) {
perror("Didn't find spam regexp file");
printf("To load a spam regexp, write it in a file nammed \"%s\" or set it\n", SPAM_FILE_NAME);
printf("as an environment variable, \"%s.\" Please enter the regexp with which to\n", SPAM_ENV_VAR);
printf("smite the vile spam:\n");
regPtr = regStr;
if((len = getstr(&regPtr, sizeof(regStr), 1)) < 0) {
destroy_mail_session(ms);
return 0;
}
putchar('\n');
} else if(fp) {
int ch;
printf("Reading regexp from file \"%s.\"\n", SPAM_FILE_NAME);
len = 0;
regPtr = regStr;
for( ; ; ) {
if((ch = fgetc(fp)) == EOF) break;
if(ch && ch != '\n' && ch != '\r') {
*(regPtr++) = ch;
if(len++ >= sizeof(regStr)) {
printf("Regexp size exceeded limit of %u bytes.\n", sizeof(regStr));
len = 0;
break;
}
}
}
fclose(fp);
*regPtr = 0;
} else {
if((len = strlen(regPtr)) >= sizeof(regStr)) {
printf("Regexp size exceeded limit of %u bytes.\n", sizeof(regStr));
len = 0;
} else if(len >= 2
&& ((regPtr[0] == '\'' && regPtr[len - 1] == '\'')
|| (regPtr[0] == '\"' && regPtr[len - 1] == '\"'))) {
memcpy(regStr, regPtr + 1, len - 2);
regStr[len - 2] = 0;
} else {
memcpy(regStr, regPtr, len);
regStr[len] = 0;
}
}
if(len > 0) {
if(!(ms->spamRe = regcomp(regStr)))
printf("Error compiling spam regexp.\n");
else
printf("Spam regexp is %s\n", regStr);
}
}
return ms;
}
static void destroy_mail_session(MailSession *ms) {
/* Email *eml, *nextEml; */
if(!ms) return;
if(ms->log) {
printf("Closing log file.\n");
fclose(ms->log); ms->log = 0;
}
if(ms->subjRe) { free(ms->subjRe); ms->subjRe = 0; }
if(ms->fromRe) { free(ms->fromRe); ms->fromRe = 0; }
if(ms->spamRe) { free(ms->spamRe); ms->spamRe = 0; }
/* for(eml = ms->emailList; eml; eml = nextEml) {
nextEml = eml->next;
free(eml);
} */
free(ms);
}
static int check_email(MailSession *ms, Net *net, char *name, unsigned int port) {
unsigned int lnRem, lnEol, svRem, svEol;
char *lnPtr, *svNl, *svPtr;
/* connect to the given host */
if(!set_net_host(net, name, port)
|| !connect_net(net)) return 0;
/* loop reading lines from the server */
lnPtr = ms->line;
lnRem = sizeof(ms->line) - 1;
svPtr = 0;
svRem = 0;
for( ; ; ) {
/* if the server string is empty, check for more */
if(!svRem && !read_net_string(net, &svPtr, &svRem, 100000)) return 0;
/* how many chars until the end of the line */
svEol = (svNl = strchr(svPtr, '\n')) ? svNl - svPtr + 1 : svRem;
lnEol = (svEol > lnRem) ? lnRem : svEol;
/* copy over a whole line from the server string into the local one */
memcpy(lnPtr, svPtr, lnEol);
lnPtr[lnEol] = 0;
/*printf("svPtr = %s; svRem = %u; lnRem = %u; svEol = %u; lnEol = %u; lnPtr = %s\n", svPtr, svRem, lnRem, svEol, lnEol, lnPtr);*/
/* shift all positions by this amount */
svPtr += lnEol;
svRem -= lnEol;
svEol -= lnEol;
lnPtr += lnEol;
lnRem -= lnEol;
/* check if there was a new line or the local buffer is full */
if(svNl || !lnRem) {
ms->lnSize = sizeof(ms->line) - lnRem - 1;
ms->rpSize = sizeof(ms->resp);
if(!get_response(ms)) break;
if(ms->rpSize && !send_net_string(net, ms->resp, ms->rpSize)) return 0;
lnPtr = ms->line;
lnRem = sizeof(ms->line) - 1;
}
}
return 1;
}
static int get_response(MailSession *ms) {
char *rpPtr;
if(ms->state != PARSE_DATA) {
printf("Mr. Mail Deamon: %s", ms->line);
if(!ms->lnSize || ms->line[ms->lnSize - 1] != '\n') putchar('\n');
}
switch(ms->state) {
case WAIT_GREET:
if(*ms->line != '+') {
printf("If this is a POP3 mail server, it seems to be having an identity crisis.\n");
return 0;
}
printf("The server is glad to see you. It wants your user name: ");
rpPtr = ms->resp + sprintf(ms->resp, "user ");
if(getstr(&rpPtr, ms->rpSize + ms->resp - rpPtr, 1) < 0) return 0;
printf("\n"); rpPtr += sprintf(rpPtr, "\n");
ms->rpSize = rpPtr - ms->resp;
printf("%s: %s", programme, ms->resp);
ms->state = WAIT_USEROK;
return 1;
case WAIT_USEROK:
if(*ms->line == '-') break;
if(*ms->line != '+') return 1;
printf("That user name seems acceptable. Now for a password: ");
rpPtr = ms->resp + sprintf(ms->resp, "pass ");
if(getstr(&rpPtr, ms->rpSize + ms->resp - rpPtr, 0) < 0) return 0;
printf("\n"); rpPtr += sprintf(rpPtr, "\n");
ms->rpSize = rpPtr - ms->resp;
printf("%s: pass <secret ninja-encrypted password>\n", programme/*, ms->resp*/);
ms->state = WAIT_PASSOK;
return 1;
case WAIT_PASSOK:
if(*ms->line == '-') break;
if(*ms->line != '+') return 1;
printf("The server has accepted you! It thinks you are Special.\n");
sprintf(ms->resp, "stat\n"); ms->rpSize = 5;
printf("%s: %s", programme, ms->resp);
ms->state = WAIT_STAT;
return 1;
case WAIT_STAT:
if(*ms->line == '-') break;
if(*ms->line != '+') return 1;
{
char *numStart;
rpPtr = ms->line;
while(*rpPtr && *rpPtr != ' ') rpPtr++;
while(*rpPtr == ' ') rpPtr++;
if(!*(numStart = rpPtr)) { printf("That doesn't make any sense!\n"); break; }
while(*rpPtr && *rpPtr != ' ') rpPtr++;
*rpPtr = 0;
ms->mailCount = atoi(numStart);
}
if(ms->mailPos <= ms->mailCount) {
rpPtr = ms->resp + sprintf(ms->resp, "retr %u\n", ms->mailPos);
ms->rpSize = rpPtr - ms->resp;
ms->state = WAIT_RETROK;
} else {
sprintf(ms->resp, "quit\n"); ms->rpSize = 5;
ms->state = RUN_AWAY;
}
printf("%s: %s", programme, ms->resp);
return 1;
case WAIT_RETROK:
if(*ms->line == '-') break;
if(*ms->line != '+') return 1;
*ms->resp = 0;
ms->rpSize = 0;
/* keep it simple . . . (who wants confirmation later anyway?)
{
Email *eml;
if(!(eml = malloc(sizeof(Email))))
perror("Failed allocating memory to store e-mail info.");
else {
eml->next = ms->emailList;
eml->subject[0] = 0;
eml->sender[0] = 0;
eml->number = ms->mailPos;
eml->spamFactor = 0;
ms->emailList = eml;
}
} */
ms->spamFactor = 0;
/* printf("[ Scouring message %u for unholy spam . . . ]\n", ms->mailPos); */
ms->state = PARSE_DATA;
return 1;
case PARSE_DATA:
if(ms->line[0] == '.' && (ms->line[1] == '\r' || ms->line[1] == '\n')) {
if(ms->log) fprintf(ms->log, ".\n[ End of Message %u. ]\n", ms->mailPos);
if(ms->spamFactor) {
rpPtr = ms->resp + sprintf(ms->resp, "dele %u\n", ms->mailPos);
ms->rpSize = rpPtr - ms->resp;
ms->state = WAIT_DELEOK;
} else if(++ms->mailPos <= ms->mailCount) {
rpPtr = ms->resp + sprintf(ms->resp, "retr %u\n", ms->mailPos);
ms->rpSize = rpPtr - ms->resp;
ms->state = WAIT_RETROK;
} else {
sprintf(ms->resp, "quit\n"); ms->rpSize = 5;
ms->state = RUN_AWAY;
}
printf("%s: %s", programme, ms->resp);
} else {
if(ms->log) fprintf(ms->log, "%s", ms->line);
/* if(ms->emailList
&& ms->emailList->number == ms->mailPos) {
if(!ms->emailList->subject[0]
&& ms->subjRe && regexec(ms->subjRe, ms->line)) {
strncpy(ms->emailList->subject, ms->line, sizeof(ms->emailList->subject));
printf("%s", ms->line);
} else if(!ms->emailList->sender[0]
&& ms->fromRe && regexec(ms->fromRe, ms->line)) {
strncpy(ms->emailList->subject, ms->line, sizeof(ms->emailList->subject));
printf("%s", ms->line);
}
if(!ms->emailList->spamFactor
&& ms->spamRe && regexec(ms->spamRe, ms->line)) {
ms->emailList->spamFactor++;
sm->spamFactor++;
printf("EVIL SPAM!->%s", ms->line);
}
} */
if(ms->subjRe && regexec(ms->subjRe, ms->line))
printf("%s", ms->line);
else if(ms->fromRe && regexec(ms->fromRe, ms->line))
printf("%s", ms->line);
if(ms->spamRe && regexec(ms->spamRe, ms->line)) {
ms->spamFactor++;
printf("---EVIL SPAM!--->%s", ms->line);
}
*ms->resp = 0;
ms->rpSize = 0;
}
return 1;
case WAIT_DELEOK:
if(*ms->line == '-') break;
if(*ms->line != '+') return 1;
if(++ms->mailPos <= ms->mailCount) {
rpPtr = ms->resp + sprintf(ms->resp, "retr %u\n", ms->mailPos);
ms->rpSize = rpPtr - ms->resp;
ms->state = WAIT_RETROK;
} else {
sprintf(ms->resp, "quit\n"); ms->rpSize = 5;
ms->state = RUN_AWAY;
}
printf("%s: %s", programme, ms->resp);
return 1;
case RUN_AWAY:
if(*ms->line != '+') printf("The server is very confused. ");
printf("Bye server.\n");
return 0;
}
printf("The server is confused!\n");
sprintf(ms->resp, "quit\n"); ms->rpSize = 5;
ms->state = RUN_AWAY;
return 1;
}
static int getstr(char **buf, int size, int echo) {
int ch;
int pos = 0;
char *str = *buf;
if(size < 1) return -1;
*str = 0;
for( ; ; ) {
ch = getch();
if(ch <= 0) return -1;
if((ch & 0x60) == 0x00) {
switch((ch & 0x1F) | 0x40) {
case '@': /* ^@ - null */
case 'C': /* ^C - end of text */
case 'D': /* ^D - end of transmission */
case '[': /* ^[ - escape */
*buf = str;
return -1;
case 'U':
if(echo) { while(pos--) printf("\b \b"); }
pos = 0; *(str = *buf) = 0;
break;
case 'H':
if(pos) {
pos--; *(--str) = 0;
if(echo) printf("\b \b");
}
break;
case 'J': /* ^J - LF (NL) new line */
case 'M': /* ^M - CR return */
*buf = str;
return pos;
}
} else if(ch == 0x7F) {
} else {
if(pos + 1 < size) {
if(echo) putchar(ch);
str[0] = ch;
str[1] = 0;
if(pos + 2 < size) { pos++; str++; }
}
}
}
}

38
killspam/makefile Normal file
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@ -0,0 +1,38 @@
out := killspam.exe
obj := net.o killspam.o
res := deathico.res
lib := ws2_32.lib regexp.lib
# cc = gcc -c -fasm -pedantic -Wall -O3\
# -fomit-frame-pointer -ffast-math -funroll-loops\
# $*.c -o $*.o
# ld = gcc -s -lws2_32 -O3 -o $(out) $(obj) $(res) $(lib)
# rc = windres $*.rc -o $*.res
cc = lcc -A -ansic -e8 -O -Fo$*.o $*.c
ld = lcclnk -s -o $(out) $(obj) $(res) $(lib)
rc = lrc -Fo$*.res $*.rc
default : $(out)
.PHONY : clean
clean :
$(foreach file, $(obj) $(out), -$(RM) $(file)$(br))
$(out) : $(obj) $(res)
$(ld)
net.o : net.c
$(cc)
killspam.o : killspam.c
$(cc)
deathico.res : deathico.rc
$(rc)
%.o : %.c
$(cc)
%.res : %.rc
$(rc)

227
killspam/net.c Normal file
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@ -0,0 +1,227 @@
/* Copyright 2006 Neil Edelman, distributed under the terms of the
GNU General Public License, see copying.txt */
/* this is a socket programme for Windows that goes with the KillSpam */
#include <winsock2.h>
#include <stdlib.h> /* malloc(), free() */
#include <stdio.h> /* printf(), fprintf(), perror() */
#include <string.h> /* strncmp() */
#include "net.h"
#define WSA_VERSION 2
struct tagNet {
enum {
WSA_DLL = 1,
FOUND_HOST = 2,
CONNECTED = 4
} flags;
int sd;
unsigned long nlAddr;
unsigned short nsPort;
unsigned int bufSize;
char *buffer;
};
Net *create_net(unsigned int bufSize) {
WSADATA wsaData;
Net *net;
int ret;
/* require a buffer with at least a single character in it plus a null */
if(bufSize < 2) return 0;
/* allocate and initialize the new structure */
if(!(net = malloc(sizeof(Net) + bufSize))) return 0;
net->flags = 0;
net->sd = INVALID_SOCKET;
net->nlAddr = INADDR_NONE;
net->bufSize = bufSize;
net->buffer = (char *)(net + 1);
/* load Winsock 2.0 DLL */
if((ret = WSAStartup(WSA_VERSION, &wsaData)) != 0) {
printf("Error initializing windows socket library (%d.)\n", ret);
destroy_net(net);
return 0;
} else {
printf("Windows socket library loaded.\n");
net->flags |= WSA_DLL;
}
return net;
}
void destroy_net(Net *net) {
if(!net) return;
if(net->flags & CONNECTED) disconnect_net(net);
if(net->flags & WSA_DLL) {
printf("Releasing Windows sockets library.\n");
/* unload Winsock DLL */
if(WSACleanup() != 0) {
printf("Failed shutting down socket library (%d.)\n", WSAGetLastError());
}
}
free(net);
}
int set_net_host(Net *net, char *hostName, unsigned short port) {
unsigned long nlAddr;
if(!net || !net->flags & WSA_DLL || !hostName) return 0;
/* first check if this is a valid dotted IP address */
if((nlAddr = inet_addr(hostName)) == INADDR_NONE) {
/* make sure it wasn't specifically INADDR_NONE */
if(strncmp(hostName, "255.255.255.255", 15) != 0) {
struct hostent *ent;
printf("Looking up %s.\n", hostName);
/* lastly try to look up the host address with DNS */
if(!(ent = gethostbyname(hostName))) {
/* herror("Looking up host address"); <- not in WSA */
printf("Couldn't find address %s (%d.)\n", hostName, WSAGetLastError());
} else {
struct in_addr inadr;
nlAddr = inadr.s_addr = *((unsigned long *)ent->h_addr_list[0]);
printf("Found I.P. %s.\n", inet_ntoa(inadr));
}
}
}
if(nlAddr == INADDR_NONE) return 0;
net->nlAddr = nlAddr;
/* set the port using network byte order */
net->nsPort = htons(port);
net->flags |= FOUND_HOST;
return 1;
}
int connect_net(Net *net) {
struct sockaddr_in inaddr;
if(!net
|| !(net->flags & FOUND_HOST)
|| (net->flags & CONNECTED)) return 0;
/* create the socket */
if((net->sd = socket(PF_INET, SOCK_STREAM, 0)) == INVALID_SOCKET) {
perror("Unable to create socket");
/* printf("Unable to create socket (%u.)\n", WSAGetLastError()); */
return 0;
} else {
printf("Opened socket.\n");
}
/* connect to the host */
memset(&inaddr, 0, sizeof(inaddr));
inaddr.sin_family = AF_INET;
inaddr.sin_port = net->nsPort;
inaddr.sin_addr.s_addr = net->nlAddr;
if(connect(net->sd, (const struct sockaddr *)&inaddr, sizeof(inaddr)) != 0) {
perror("Failed connecting to host");
/* printf("Failed connecting to host (%u.)\n", WSAGetLastError()); */
disconnect_net(net);
return 0;
}
else {
net->flags |= CONNECTED;
printf("Connected on port %u.\n", ntohs(inaddr.sin_port));
}
return 1;
}
void disconnect_net(Net *net) {
if(!net) return;
if((net->flags & CONNECTED)) {
int len;
printf("Disconnecting.\n");
/* initiate sending shutdown */
if(shutdown(net->sd, SD_SEND) != 0) {
perror("Error shutting down outgoing connection");
/* printf("Error shutting down outgoing connection (%u.)\n", WSAGetLastError()); */
}
/* loop on recv until all data is received */
while((len = recv(net->sd, net->buffer, net->bufSize, 0))) {
if(len == SOCKET_ERROR) {
perror("Error receiving left-over data");
/* printf("Error receiving left-over data (%u.)\n", WSAGetLastError()); */
break;
}
}
/* shut down reading on this connection */
if(shutdown(net->sd, SD_RECEIVE) != 0) {
perror("Error shutting down incoming connection");
/*printf("Error shutting down incoming connection (%u.)\n", WSAGetLastError()); */
}
net->flags &= ~CONNECTED;
}
if(net->sd != INVALID_SOCKET) {
printf("Closing socket.\n");
/* release the socket descriptor */
if(closesocket(net->sd) != 0) {
perror("Unable to close socket");
/* printf("Unable to close socket (%u.)\n", WSAGetLastError()); */
} else {
net->sd = INVALID_SOCKET;
}
}
}
int send_net_string(Net *net, char *str, int len) {
int ret;
if(!net || !(net->flags & CONNECTED)) return 0;
for( ; ; ) {
if((ret = send(net->sd, str, len, 0)) == SOCKET_ERROR) {
perror("Error sending data");
/* printf("Error sending data (%u.)\n", WSAGetLastError()); */
return 0;
}
str += ret;
if((len -= ret) <= 0) break;
}
return 1;
}
int read_net_string(Net *net, char **bufAddr, unsigned int *lenAddr, long usec) {
struct timeval tv;
struct fd_set readfds;
int len;
if(!net
|| !(net->flags & CONNECTED)
|| usec < 0) return 0;
tv.tv_sec = 0;
tv.tv_usec = usec;
/* initialize to an empty buffer */
*net->buffer = 0;
*bufAddr = net->buffer;
*lenAddr = 0;
/* since this is Windows, it doesn't quite work like it should */
/* fdStdin = fileno(stdin); */
FD_ZERO(&readfds);
/* FD_SET(fdStdin, &readfds); */
FD_SET(net->sd, &readfds);
/* fdMax = (net->sd > fdStdin) ? net->sd : fdStdin; */
if((len = select(net->sd, &readfds, 0, 0, &tv)) == SOCKET_ERROR) {
perror("Error checking input status");
return 0;
}
/* ioctlsocket(net->sd, FIONREAD, &amount);
if(!amount) return 0; */
if(FD_ISSET(net->sd, &readfds)) {
if((len = recv(net->sd, net->buffer, net->bufSize - 1, 0)) == SOCKET_ERROR) {
perror("Error receiving data");
/* printf("Error receiving data (%u.)\n", WSAGetLastError()); */
return 0;
} else if(!len) {
printf("Connection terminated by host.\n");
/* successfully reading nothing indicates disconnection */
net->flags &= ~CONNECTED;
return 0;
}
/* this will never happen */
if(len > net->bufSize - 1) len = net->bufSize - 1;
/* terminate the buffer with a null character */
net->buffer[len] = 0;
*lenAddr = len;
}
return 1;
}

9
killspam/net.h Normal file
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typedef struct tagNet Net;
Net *create_net(unsigned int bufSize);
void destroy_net(Net *net);
int set_net_host(Net *net, char *hostName, unsigned short port);
int connect_net(Net *net);
void disconnect_net(Net *net);
int send_net_string(Net *net, char *str, int len);
int read_net_string(Net *net, char **bufAddr, unsigned int *lenAddr, long usec);

21
killspam/spamregx Normal file
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@ -0,0 +1,21 @@
^(To|C[Cc]): .*@(hotmail|yahoo).com|
^Subject: .*([Mm]ortgage|[Dd]ebt|[Mm]oney|[Aa]pprov(ed|al)|[Ee]-?[Bb]ay|
[Bb]ulk e-?mail|EMAIL|[Vv][Ii1][Aa][Gg][Rr][Aa]| Meds| |
[Pp]rescr[1i]pt[1i]on|[0-9]+% [Oo]ff|!$)|
^X-Mailer: The Bat! .* Business|
Received: from [a-z\.]*\.(jp|ro|net|ru|ar|uk) \(unknown|
<!.+>.+<!.+>.+<!.+>.+<!.+>|<IMG |<img |document.write|
META content=Word\.Document|
http://[A-Za-z0-9\.@:]*(viagr|love|insurance|hitbox|bargain|deals|taboo|nasty|
depraves|dirty|russian|video|@www|easy)|
Content-Type: application/x-msdownload; name=".*\.scr"
\?RefId=[0-9]|
can ?not be considered as Spam|[Tt]his is [Nn][Oo][Tt] unsolicited email|
are strongly against sending unsolicited email|ou have opted in to|
sent in compliance with|(sobre|considerad[ao]) SPAM|
FREE|[Cc].?lick (now|here)|money back guaranteed|[Mm]ake [Mm]oney [Ff]ast|
[Nn]o [Cc]redit [Cc]heck|refinance your mortgage|[Ll]ow.*[Rr]ate.*mortgage|
Norton Antivirus|Support our Troops|investigate your friends|
[Rr]educe your debebt|[Dd]ebt [Ff]ree|
[Dd]octor approved|Vi<!|Meds Online|Viagra|[Pp]heromone|[Pp]en[ií]s|[Mm]asturba|
at least (18|19|21) years

30
readme.txt Normal file
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@ -0,0 +1,30 @@
Copyright (C) 2006 Neil Edelman, see copying.txt.
neil dot edelman each mail dot mcgill dot ca
Version 1.0.
This came in 2006 after attending a talk on bioinformatics.
I had the idea of making an email client that would take the
methods of bioinformatics and apply them to spam-detection.
Searches through input and outputs sequences that are repeated.
Because it's intended for text files, control characters are
ignored.
FindPatterns [filename] [-b] [-e] [-i] [-o] [-v] [-m<n>] [-l<n>] [-g<n>] [-?|h]
filename Attempt to read input from this file, otherwise uses stdin.
-b Keep a buffer to count repeated matches (!o -> b.)
-e Echo input.
-i Case-insensitive (not implemented.)
-n Don't display matches at the end.
-o Output matches immediately as they are found.
-s Silent mode - plain output with no extra characters.
-v Verbose comments while outputting.
-g<n> Set memory buffer granularity to the closest power of two
lower than <n> bytes (default 1024.)
-l<n> Set match limit to <n> matches (default 4096; 0 -> no limit.)
-m<n> Set minimum match length to <n> symbols (default 3).
-?|h Display this help screen and exit.
Adding -<s>- will turn off switch <s>.

21
spamregx Normal file
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@ -0,0 +1,21 @@
^(To|C[Cc]): .*@(hotmail|yahoo).com|
^Subject: .*([Mm]ortgage|[Dd]ebt|[Mm]oney|[Aa]pprov(ed|al)|[Ee]-?[Bb]ay|
[Bb]ulk e-?mail|EMAIL|[Vv][Ii1][Aa][Gg][Rr][Aa]| Meds| |
[Pp]rescr[1i]pt[1i]on|[0-9]+% [Oo]ff|!$)|
^X-Mailer: The Bat! .* Business|
Received: from [a-z\.]*\.(jp|ro|net|ru|ar|uk) \(unknown|
<!.+>.+<!.+>.+<!.+>.+<!.+>|<IMG |<img |document.write|
META content=Word\.Document|
http://[A-Za-z0-9\.@:]*(viagr|love|insurance|hitbox|bargain|deals|taboo|nasty|
depraves|dirty|russian|video|@www|easy)|
Content-Type: application/x-msdownload; name=".*\.scr"
\?RefId=[0-9]|
can ?not be considered as Spam|[Tt]his is [Nn][Oo][Tt] unsolicited email|
are strongly against sending unsolicited email|ou have opted in to|
sent in compliance with|(sobre|considerad[ao]) SPAM|
FREE|[Cc].?lick (now|here)|money back guaranteed|[Mm]ake [Mm]oney [Ff]ast|
[Nn]o [Cc]redit [Cc]heck|refinance your mortgage|[Ll]ow.*[Rr]ate.*mortgage|
Norton Antivirus|Support our Troops|investigate your friends|
[Rr]educe your debebt|[Dd]ebt [Ff]ree|
[Dd]octor approved|Vi<!|Meds Online|Viagra|[Pp]heromone|[Pp]en[ií]s|[Mm]asturba|
at least (18|19|21) years