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static char rcsid[] ="@(#)$Id: rules.c,v 5.5 1992/12/11 01:45:04 syd Exp $";
/*******************************************************************************
* The Elm Mail System - $Revision: 5.5 $ $State: Exp $
*
* Copyright (c) 1988-1992 USENET Community Trust
* Copyright (c) 1986,1987 Dave Taylor
*******************************************************************************
* Bug reports, patches, comments, suggestions should be sent to:
*
* Syd Weinstein - elm@DSI.COM
* dsinc!elm
*
*******************************************************************************
* $Log: rules.c,v $
* Revision 5.5 1992/12/11 01:45:04 syd
* remove sys/types.h include, it is now included by defs.h
* and this routine includes defs.h or indirectly includes defs.h
* From: Syd
*
* Revision 5.4 1992/11/22 00:06:45 syd
* Fix when expanding the macro '%S', the subject line is scanned for a
* 'Re:', and if nothing is found, a '"Re: ' is added. But when a 'Re:'
* *is* found, then nothing is added, not even the '"'.
* From: Sigmund Austigard <austig@solan.unit.no>
*
* Revision 5.3 1992/11/17 04:10:01 syd
* The changes to filter/regexp.c are to correct compiler warnings about
* unreachable statements.
*
* The changes to filter/rules.c are to correct the fact that we are passing
* a pointer to a condition_rec structore to a function expecting a pointer to
* a character string.
* From: Tom Moore <tmoore@fievel.DaytonOH.NCR.COM>
*
* Revision 5.2 1992/11/15 01:40:43 syd
* Add regexp processing to filter.
* Add execc operator
* From: Jan Djarv <Jan.Djarv@sa.erisoft.se>
*
* Revision 5.1 1992/10/03 22:18:09 syd
* Initial checkin as of 2.4 Release at PL0
*
*
******************************************************************************/
/** This file contains all the rule routines, including those that apply the
specified rules and the routine to print the rules out.
**/
#include <stdio.h>
#include "defs.h"
#include <pwd.h>
#include <ctype.h>
#ifdef I_TIME
# include <time.h>
#endif
#ifdef I_SYSTIME
# include <sys/time.h>
#endif
#include <fcntl.h>
#include "filter.h"
#include "s_filter.h"
char *listrule();
static struct regexp *last_regexp = NULL;
static int
matches(str, relation, cond)
char *str;
int relation;
struct condition_rec *cond;
{
if (relation == RE) {
if (cond->regex == NULL) cond->regex = regcomp(cond->argument1);
if (regexec(cond->regex, str)) {
last_regexp = cond->regex;
return TRUE;
} else {
return FALSE;
}
} else {
return contains(str, cond->argument1);
}
}
void
regerror(s)
char *s;
{
if (outfd != NULL)
fprintf(outfd,
catgets(elm_msg_cat,
FilterSet,FilterCantCompileRegexp,
"filter (%s): Error: can't compile regexp: \"%s\"\n"),
username, s);
if (outfd != NULL) fclose(outfd);
exit(1);
}
int
action_from_ruleset()
{
/** Given the set of rules we've read in and the current to, from,
and subject, try to match one. Return the ACTION of the match
or LEAVE if none found that apply.
**/
register int iindex = 0, not, relation, try_next_rule, x;
struct condition_rec *cond;
while (iindex < total_rules) {
cond = rules[iindex].condition;
try_next_rule = 0;
while (cond != NULL && ! try_next_rule) {
not = (cond->relation < 0);
relation = abs(cond->relation);
switch (cond->matchwhat) {
case TO : x = matches(to, relation, cond); break;
case FROM : x = matches(from, relation, cond); break;
case SENDER : x = matches(sender, relation, cond); break;
case SUBJECT: x = matches(subject, relation, cond); break;
case LINES : x = compare(lines, relation, cond); break;
case CONTAINS: if (outfd != NULL) fprintf(outfd,
catgets(elm_msg_cat,
FilterSet,FilterContainsNotImplemented,
"filter (%s): Error: rules based on 'contains' are not implemented!\n"),
username);
if (outfd != NULL) fclose(outfd);
exit(0);
case ALWAYS: not = FALSE; x = TRUE; break;
}
if ((not && x) || ((! not) && (! x))) /* this test failed (LISP?) */
try_next_rule++;
else
cond = cond->next; /* next condition, if any? */
}
if (! try_next_rule) {
rule_choosen = iindex;
return(rules[rule_choosen].action);
}
iindex++;
}
rule_choosen = -1;
return(LEAVE);
}
#define get_the_time() if (!gotten_time) { \
thetime = time( (time_t *) 0); \
timerec = localtime(&thetime); \
gotten_time++; \
}
static struct {
int id;
char *str;
} regmessage[] = {
FilterWholeRegsub, "<match>",
FilterRegsubOne, "<submatch-1>",
FilterRegsubTwo, "<submatch-2>",
FilterRegsubThree, "<submatch-3>",
FilterRegsubFour, "<submatch-4>",
FilterRegsubFive, "<submatch-5>",
FilterRegsubSix, "<submatch-6>",
FilterRegsubSeven, "<submatch-7>",
FilterRegsubEight, "<submatch-8>",
FilterRegsubNine, "<submatch-9>",
};
expand_macros(word, buffer, line, display)
char *word, *buffer;
int line, display;
{
/** expand the allowable macros in the word;
%d = day of the month
%D = day of the week
%h = hour (0-23)
%m = month of the year
%n = sender of message
%r = return address of sender
%s = subject of message
%S = "Re: subject of message" (only add Re: if not there)
%t = hour:minute
%y = year
%& = the whole string that matched last regexp
%1-%9 = matched subexpressions in last regexp
or simply copies word into buffer. If "display" is set then
instead it puts "<day-of-month>" etc. etc. in the output.
**/
#ifndef _POSIX_SOURCE
struct tm *localtime();
time_t time();
#endif
struct tm *timerec;
time_t thetime;
register int i, j=0, gotten_time = 0, reading_a_percent_sign = 0,
len, backslashed=0, regsub;
for (i = 0, len = strlen(word); i < len; i++) {
if (reading_a_percent_sign) {
reading_a_percent_sign = 0;
switch (word[i]) {
case 'n' : buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterSender,
"<sender>"));
else {
strcat(buffer, "\"");
strcat(buffer, sender);
strcat(buffer, "\"");
}
j = strlen(buffer);
break;
case 'r' : buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterReturnAddress,
"<return-address>"));
else
strcat(buffer, from);
j = strlen(buffer);
break;
case 's' : buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterSubject,
"<subject>"));
else {
strcat(buffer, "\"");
strcat(buffer, subject);
strcat(buffer, "\"");
}
j = strlen(buffer);
break;
case 'S' : buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterReSubject,
"<Re: subject>"));
else {
strcat(buffer, "\"");
if (! the_same(subject, "Re:"))
strcat(buffer, "Re: ");
strcat(buffer, subject);
strcat(buffer, "\"");
}
j = strlen(buffer);
break;
case 'd' : get_the_time(); buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterDayOfMonth,
"<day-of-month>"));
else
strcat(buffer, itoa(timerec->tm_mday,FALSE));
j = strlen(buffer);
break;
case 'D' : get_the_time(); buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterDayOfWeek,
"<day-of-week>"));
else
strcat(buffer, itoa(timerec->tm_wday,FALSE));
j = strlen(buffer);
break;
case 'm' : get_the_time(); buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterMonth,
"<month>"));
else
sprintf(&buffer[j],"%2.2d",timerec->tm_mon+1);
j = strlen(buffer);
break;
case 'y' : get_the_time(); buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterYear,
"<year>"));
else
strcat(buffer, itoa(timerec->tm_year,FALSE));
j = strlen(buffer);
break;
case 'h' : get_the_time(); buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterHour,
"<hour>"));
else
strcat(buffer, itoa(timerec->tm_hour,FALSE));
j = strlen(buffer);
break;
case 't' : get_the_time(); buffer[j] = '\0';
if (display)
strcat(buffer,catgets(elm_msg_cat,
FilterSet,FilterTime,
"<time>"));
else {
strcat(buffer, itoa(timerec->tm_hour,FALSE));
strcat(buffer, ":");
strcat(buffer, itoa(timerec->tm_min,TRUE));
}
j = strlen(buffer);
break;
case '&': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (word[i] == '&') regsub = 0;
else regsub = word[i] - '0';
if (display) {
strcat(buffer,catgets(elm_msg_cat,
FilterSet,
regmessage[regsub].id,
regmessage[regsub].str));
j = strlen(buffer);
} else {
if (last_regexp != NULL) {
char *sp = last_regexp->startp[regsub];
char *ep = last_regexp->endp[regsub];
if (sp != NULL && ep != NULL && ep > sp)
while (sp < ep) buffer[j++] = *sp++;
}
}
break;
default : if (outfd != NULL) fprintf(outfd,
catgets(elm_msg_cat,
FilterSet,FilterErrorTranslatingMacro,
"filter (%s): Error on line %d translating %%%c macro in word \"%s\"!\n"),
username, line, word[i], word);
if (outfd != NULL) fclose(outfd);
exit(1);
}
}
else if (word[i] == '%') {
if (backslashed) {
buffer[j++] = '%';
backslashed = 0;
} else {
reading_a_percent_sign++;
}
} else if (word[i] == '\\') {
if (backslashed) {
buffer[j++] = '\\';
backslashed = 0;
} else {
backslashed++;
}
} else {
buffer[j++] = (word[i] == '_' ? ' ' : word[i]);
backslashed = 0;
}
}
buffer[j] = '\0';
}
print_rules()
{
/** print the rules out. A double check, of course! **/
register int i = -1;
char *whatname(), *actionname();
struct condition_rec *cond;
if (outfd == NULL) return; /* why are we here, then? */
while (++i < total_rules) {
if (rules[i].condition->matchwhat == ALWAYS) {
fprintf(outfd,catgets(elm_msg_cat,FilterSet,FilterAlways,
"\nRule %d: ** always ** \n\t%s %s\n"), i+1,
actionname(rules[i].action), listrule(rules[i].argument2));
continue;
}
fprintf(outfd,catgets(elm_msg_cat,FilterSet,FilterRuleIf,
"\nRule %d: if ("), i+1);
cond = rules[i].condition;
while (cond != NULL) {
if (cond->relation < 0)
fprintf(outfd,catgets(elm_msg_cat,FilterSet,FilterNot,
"not %s %s %s%s%s"),
whatname(cond->matchwhat),
relationname(- (cond->relation)),
quoteit(cond->matchwhat),
cond->argument1,
quoteit(cond->matchwhat));
else
fprintf(outfd, "%s %s %s%s%s",
whatname(cond->matchwhat),
relationname(cond->relation),
quoteit(cond->matchwhat),
cond->argument1,
quoteit(cond->matchwhat));
cond = cond->next;
if (cond != NULL)
fprintf(outfd,catgets(elm_msg_cat,
FilterSet,FilterAnd,
" and "));
}
fprintf(outfd,catgets(elm_msg_cat,FilterSet,FilterThen,
") then\n\t %s %s\n"),
actionname(rules[i].action),
listrule(rules[i].argument2));
}
fprintf(outfd, "\n");
}
char *whatname(n)
int n;
{
static char buffer[10];
switch(n) {
case FROM : return("from");
case TO : return("to");
case SENDER : return("sender");
case SUBJECT: return("subject");
case LINES : return ("lines");
case CONTAINS: return("contains");
default : sprintf(buffer, "?%d?", n); return((char *)buffer);
}
}
char *actionname(n)
int n;
{
switch(n) {
case DELETE_MSG : return(catgets(elm_msg_cat,
FilterSet,FilterDelete,
"Delete"));
case SAVE : return(catgets(elm_msg_cat,
FilterSet,FilterSave,
"Save"));
case SAVECC : return(catgets(elm_msg_cat,
FilterSet,FilterCopyAndSave,
"Copy and Save"));
case FORWARD : return(catgets(elm_msg_cat,
FilterSet,FilterForward,
"Forward"));
case FORWARDC : return(catgets(elm_msg_cat,
FilterSet,FilterCopyAndForward,
"Copy and Forward"));
case LEAVE : return(catgets(elm_msg_cat,
FilterSet,FilterLeave,
"Leave"));
case EXEC : return(catgets(elm_msg_cat,
FilterSet,FilterExecute,
"Execute"));
case EXECC : return(catgets(elm_msg_cat,
FilterSet,FilterExecuteAndSave,
"Execute and Save"));
default : return(catgets(elm_msg_cat,
FilterSet,FilterAction,
"?action?"));
}
}
int
compare(line, relop, cond)
int line, relop;
struct condition_rec *cond;
{
/** Given the actual number of lines in the message, the relop
relation, and the number of lines in the rule, as a string (!),
return TRUE or FALSE according to which is correct.
**/
int rule_lines;
rule_lines = atoi(cond->argument1);
switch (relop) {
case LE: return(line <= rule_lines);
case LT: return(line < rule_lines);
case GE: return(line >= rule_lines);
case GT: return(line > rule_lines);
case NE: return(line != rule_lines);
case EQ: return(line == rule_lines);
}
return(-1);
}
char *listrule(rule)
char *rule;
{
/** simply translates all underscores into spaces again on the
way past... **/
static char buffer[SLEN];
register int i;
i = strlen(rule);
buffer[i] = '\0';
while (--i >= 0)
buffer[i] = (rule[i] == '_' ? ' ' : rule[i]);
return( (char *) buffer);
}
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