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killprg.c
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killprg.c
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#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_DIRENT_H
# include <dirent.h>
#else
# define dirent direct
# ifdef HAVE_SYS_NDIR_H
# include <sys/ndir.h>
# endif
# ifdef HAVE_SYS_DIR_H
# include <sys/dir.h>
# endif
#endif
#ifdef HAVE_SYS_WAIT_H
# include <sys/wait.h>
#endif
#ifndef WEXITSTATUS
# define WEXITSTATUS(stat_val) ((unsigned)(stat_val) >>8)
#endif
#ifndef WIFEXITED
# define WIFEXITED(stat_val) (((stat_val) & 255) == 0)
#endif
#ifdef HAVE_LIMITS_H
#include <limits.h>
#endif
#include <string.h>
#include <sys/stat.h>
#include <sys/param.h>
#ifdef DMALLOC
#include <dmalloc.h>
#endif
#include "suck_config.h"
#include "both.h"
#include "suck.h"
#include "suckutils.h"
#include "killfile.h"
#include "phrases.h"
#ifdef MYSIGNAL
#include <signal.h>
#endif
#ifdef PERL_EMBED
#include <EXTERN.h>
#include <perl.h>
#ifdef OLD_PERL
#ifndef ERRSV
# define ERRSV (GvSV(errgv)) /* needed for perl 5.004 and earlier */
#endif
#ifndef PL_na
# define PL_na (na)
#endif
#endif /* OLD_PERL */
#endif
/* KILLPRG.C -------------------------------------------------------------*/
/* this file contains all subroutines pertaining to forking a killfile */
/* program, calling the program for each message and checking the results.*/
/* It also must handle gracefully the child dieing, etc. */
/*------------------------------------------------------------------------*/
/* function prototypes */
int find_in_path(char *);
#ifdef MYSIGNAL
RETSIGTYPE pipe_sighandler(int);
#endif
int killprg_forkit(PKillStruct mkill, char *args, int debug, int which) {
/*------------------------------------------------------------------------ */
/* take the char string args, parse it to get the program to check to see */
/* if it exists, then try to fork, execl, and set up pipe to it. If */
/* successful, return TRUE, else return FALSE. */
/*-------------------------------------------------------------------------*/
int i, newstdin[2], newstdout[2], retval = FALSE;
char *prg[KILLPRG_MAXARGS+1], *myargs = NULL, *ptr, *nptr;
/* first parse args into array */
i = strlen(args);
/* do this so can muck around with string with messing up original */
if((myargs = malloc(i+1)) == NULL) {
error_log(ERRLOG_REPORT, killp_phrases[0], NULL);
}
else {
strcpy(myargs, args);
/* strip off nl */
if(myargs[i-1] == '\n') {
myargs[i-1] = '\0';
}
/* build array of pointers to string, by finding spaces and */
/* replacing them with \0 */
i = 0;
ptr = myargs;
do {
prg[i++] = ptr;
nptr = strchr(ptr, ' ');
if(nptr != NULL) {
*nptr = '\0';
nptr++;
}
ptr = nptr;
}
while(ptr != NULL && i < KILLPRG_MAXARGS);
prg[i] = NULL; /* must do this for execv */
}
if(debug == TRUE) {
do_debug("Prg = %s, %d args\n", prg[0], i);
}
if(prg[0] != NULL && find_in_path(prg[0]) == TRUE ) {
/* okay it exists, fork, execl, etc */
/* first set up our pipes */
if(pipe(newstdin) == 0) {
if(pipe(newstdout) == 0) {
retval = TRUE;
}
else {
close(newstdin[0]);
close(newstdin[1]);
}
}
if(retval == FALSE) {
MyPerror(killp_phrases[1]);
}
else {
#ifdef MYSIGNAL
signal(SIGPIPE, pipe_sighandler); /* set up signal handler if pipe breaks */
signal_block(MYSIGNAL_ADDPIPE); /* set up sgetline() to block signal */
#endif
mkill->child.Pid=fork();
if(mkill->child.Pid == 0) {
/* in child */
close(newstdin[1]); /* will only be reading from this */
close(newstdout[0]); /* will only be writing to this */
close(0);
close(1); /* just to be on safe side */
dup2(newstdin[0], 0); /* copy new read to stdin */
dup2(newstdout[1], 1); /* copy new write to stdout */
execvp(prg[0], prg);
exit(-1); /* so if exec fails, we don't get two sucks running */
}
else if( mkill->child.Pid == -1) {
/* whoops */
MyPerror(killp_phrases[3]);
retval = FALSE;
/* close down all the pipes */
close(newstdin[0]);
close(newstdin[1]);
close(newstdout[0]);
close(newstdout[1]);
}
else {
/* parent */
close(newstdin[0]); /* will only be writing to new stdin */
close(newstdout[1]); /* will only be reading from new stdout */
/* so subroutine can read/write to child */
mkill->child.Stdin = newstdin[1];
mkill->child.Stdout = newstdout[0];
if ( which == KILL_KILLFILE) {
/* we don't do this if it's an xover file, that's done otherwhere */
mkill->killfunc = chk_msg_kill_fork; /* point to our subroutine */
}
}
}
}
if(myargs != NULL) {
free(myargs);
}
return retval;
}
/*-----------------------------------------------------------------------*/
int find_in_path(char *prg) {
/* parse the path and search thru it for the program to see if it exists */
int retval = FALSE, len;
char fullpath[PATH_MAX+1], *ptr, *mypath, *nptr;
struct stat buf;
/* if prg has a slant bar in it, its an absolute/relative path, no search done */
if(strchr(prg, '/') == NULL) {
ptr = getenv("PATH");
if(ptr != NULL) {
len = strlen(ptr)+1;
/* now have to copy the environment, since I can't touch the ptr */
if((mypath = malloc(len)) == NULL) {
error_log(ERRLOG_REPORT, "%s %s", killp_phrases[2], NULL);
}
else {
strcpy(mypath, ptr);
ptr = mypath; /* start us off */
do {
nptr = strchr(ptr, PATH_SEPARATOR);
if(nptr != NULL) {
*nptr = '\0'; /* null terminate the current one */
nptr++; /* move past it */
}
/* build the fullpath name */
strcpy(fullpath, ptr);
if(ptr[strlen(ptr)-1] != '/') {
strcat(fullpath, "/");
}
strcat(fullpath, prg);
/* okay now have path, check to see if it exists */
if(stat(fullpath, &buf) == 0) {
if(S_ISREG(buf.st_mode)) {
retval = TRUE;
}
}
/* go onto next one */
ptr = nptr;
}
while(ptr != NULL && retval == FALSE);
free(mypath);
}
}
}
/* last ditch try, in case of a relative path or current directory */
if (retval == FALSE) {
if(stat(full_path(FP_GET_NOPOSTFIX, FP_NONE, prg), &buf) == 0) {
if(S_ISREG(buf.st_mode)) {
retval = TRUE;
}
}
}
if(retval == FALSE) {
error_log(ERRLOG_REPORT, killp_phrases[3], prg, NULL);
}
return retval;
}
/*----------------------------------------------------------------------------*/
int chk_msg_kill_fork(PMaster master, PKillStruct pkill, char *header, int headerlen) {
/* write the header to ChildStdin, read from ChildStdout */
/* read 0 if get whole message, 1 if skip */
/* return TRUE if kill article, FALSE if keep */
int retval = FALSE, status;
char keepyn, keep[4], len[KILLPRG_LENGTHLEN+1];
pid_t waitstatus;
/* first make sure our child is alive WNOHANG so if its alive, immed return */
keepyn = -1; /* our error status */
waitstatus = waitpid(pkill->child.Pid, &status, WNOHANG);
if(waitstatus == 0) { /* child alive */
if(master->debug == TRUE) {
do_debug("Writing to child\n");
}
/* first write the length down */
sprintf(len, "%-*d\n", KILLPRG_LENGTHLEN-1, headerlen);
if(write(pkill->child.Stdin, len, KILLPRG_LENGTHLEN) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[4], NULL);
}
/* then write the actual header */
else if(write(pkill->child.Stdin, header, headerlen) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[4], NULL);
}
/* read the result back */
else {
if(master->debug == TRUE) {
do_debug("Reading from child\n");
}
if(read(pkill->child.Stdout, &keep, 2) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[5], NULL);
}
else {
if(master->debug == TRUE) {
keep[2] = '\0'; /* just in case */
do_debug("killprg: read '%s'\n", keep);
}
keepyn = keep[0] - '0'; /* convert ascii to 0/1 */
}
}
}
else if(waitstatus == -1) { /* huh? */
MyPerror( killp_phrases[6]);
}
else { /* child died */
error_log(ERRLOG_REPORT, killp_phrases[7], NULL);
}
switch (keepyn) {
case 0:
retval = FALSE;
break;
case 1:
retval = TRUE;
if(pkill->logyn != KILL_LOG_NONE) {
/* log it */
if(pkill->logfp == NULL) {
if((pkill->logfp = fopen(full_path(FP_GET, FP_TMPDIR, master->kill_log_name), "a")) == NULL) {
MyPerror(killp_phrases[12]);
}
}
if(pkill->logfp != NULL) {
/* first print our one line reason */
print_phrases(pkill->logfp, killp_phrases[13], (master->curr)->msgnr, NULL);
if(pkill->logyn == KILL_LOG_LONG) {
/* print the header as well */
print_phrases(pkill->logfp, "%v1%", header, NULL);
}
}
}
if(master->debug == TRUE) {
do_debug("Kill program killed: %s", header);
}
break;
default: /* error in child don't use anymore */
retval = FALSE;
pkill->killfunc = chk_msg_kill; /* back to normal method */
}
return retval;
}
/*----------------------------------------------------------------------*/
void killprg_closeit(PKillStruct master) {
/* tell it to close down by writing a length of zero */
/* then wait for the pid to close down*/
char len[KILLPRG_LENGTHLEN+1];
sprintf(len, "%-*d\n", KILLPRG_LENGTHLEN-1, 0);
write(master->child.Stdin, len, KILLPRG_LENGTHLEN);
waitpid(master->child.Pid, NULL, 0);
}
/*---------------------------------------------------------------------*/
#ifdef MYSIGNAL
RETSIGTYPE pipe_sighandler(int what) {
/* we don't have to do anything else, since the routine above will detect a dead child */
/* and handle it appropriately*/
int status;
error_log(ERRLOG_REPORT, killp_phrases[8], NULL);
wait(&status);
if(WIFEXITED(status) != 0) {
error_log(ERRLOG_REPORT, killp_phrases[9], str_int(WEXITSTATUS(status)), NULL);
}
else if(WIFSIGNALED(status) != 0) {
error_log(ERRLOG_REPORT, killp_phrases[10], str_int(WTERMSIG(status)), NULL);
}
else {
error_log(ERRLOG_REPORT, killp_phrases[11], NULL);
}
}
#endif
#ifdef PERL_EMBED
/*---------------------------------------------------------------------*/
/* MUCH OF THIS CODE COMES From the PERLEMBED man pages that comes */
/* with perl */
/*---------------------------------------------------------------------*/
int killperl_setup(PKillStruct master, char *prg, int debug, int which) {
int retval = TRUE;
char *ptr = NULL;
char *prgs[] = { ptr, ptr};
if((master->perl_int = perl_alloc()) == NULL) {
retval = FALSE;
error_log(ERRLOG_REPORT, killp_phrases[14], NULL);
}
else {
if(debug == TRUE) {
do_debug("Perl program name = %s\n", prg);
}
perl_construct(master->perl_int);
prgs[1] = prg;
if(perl_parse(master->perl_int, NULL, 2, prgs, NULL) == 0) {
perl_run(master->perl_int);
if(which == KILL_KILLFILE) {
/* we don't do this for xover, it's handled separately */
master->killfunc = chk_msg_kill_perl;
}
}
else {
error_log(ERRLOG_REPORT, killp_phrases[15], prg, NULL);
killperl_done(master);
}
}
return retval;
}
/*--------------------------------------------------------------------------*/
void killperl_done(PKillStruct master) {
perl_destruct(master->perl_int);
perl_free(master->perl_int);
master->perl_int = NULL;
master->killfunc=chk_msg_kill; /* restore default function */
}
/*----------------------------------------------------------------------------*/
int chk_msg_kill_perl(PMaster master, PKillStruct killp, char *hdr, int hdrlen) {
/* return TRUE to kill article, FALSE to keep */
/* this code comes from the both perlembed and perlcall man pages */
int i, retval = FALSE;
char *args[2] = { NULL, NULL};
dSP; /* Perl stack pointer */
/* first set up args */
args[0] = hdr;
if(master->debug == TRUE) {
do_debug("Calling %s\n", PERL_PACKAGE_SUB);
}
ENTER;
SAVETMPS;
PUSHMARK(SP);
i = perl_call_argv(PERL_PACKAGE_SUB, G_SCALAR | G_EVAL | G_KEEPERR, args);
SPAGAIN;
if(SvTRUE(ERRSV)) {
error_log(ERRLOG_REPORT, killp_phrases[16], SvPV(ERRSV,PL_na), NULL);
POPs;
killperl_done(killp);
}
else if(i != 1) {
error_log(ERRLOG_REPORT, killp_phrases[17], PERL_PACKAGE_SUB, NULL);
killperl_done(killp);
}
else {
/* 0 = keep 1 = delete */
i = POPi;
if(master->debug == TRUE) {
do_debug("retval = %d\n", i);
}
retval = (i == 0) ? FALSE : TRUE;
}
PUTBACK;
FREETMPS;
LEAVE;
if(retval == TRUE && killp->logyn != KILL_LOG_NONE) {
/* log it */
if(killp->logfp == NULL) {
if((killp->logfp = fopen(full_path(FP_GET, FP_TMPDIR, master->kill_log_name), "a")) == NULL) {
MyPerror(killp_phrases[19]);
}
}
if(killp->logfp != NULL) {
/* first print our one line reason */
print_phrases(killp->logfp, killp_phrases[18], (master->curr)->msgnr, NULL);
if(killp->logyn == KILL_LOG_LONG) {
/* print the header as well */
print_phrases(killp->logfp, "%v1%", hdr, NULL);
}
}
}
return retval;
}
#endif
/*---------------------------------------------------------------------------------*/
void killprg_sendoverview(PMaster master) {
PKillStruct killp;
POverview overp;
char buf[MAXLINLEN], len[KILLPRG_LENGTHLEN+1];
int count, status;
pid_t waitstatus;
#ifdef PERL_EMBED
char *args[2] = { NULL, NULL};
#endif
killp = master->xoverp;
overp = master->xoverview;
/* send the overview.fmt to the child process, if it exists */
if(killp != NULL && overp != NULL) {
/* first, rebuild the overview.fmt */
count = 0;
buf[0] = '\0';
while(overp != NULL) {
if(count > 0) {
strcat(buf, "\t"); /* add the separator */
}
strcat(buf, overp->header);
if(overp->full == TRUE) {
strcat(buf, "full");
}
overp = overp->next;
count++;
}
strcat(buf, "\n");
count = strlen(buf);
if(killp->child.Pid != -1) {
waitstatus = waitpid(killp->child.Pid, &status, WNOHANG);
if(waitstatus == 0) {
if(master->debug == TRUE) {
do_debug("sending overview.fmt, len = %d - %s", count, buf);
}
/* first write the length down */
sprintf(len, "%-*d\n", KILLPRG_LENGTHLEN-1, count);
if(write(killp->child.Stdin, len, KILLPRG_LENGTHLEN) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[4], NULL);
}
/* then write the actual header */
else if(write(killp->child.Stdin, buf, count) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[4], NULL);
}
}
}
#ifdef PERL_EMBED
/* this code comes from the both perlembed and perlcall man pages */
else if(killp->perl_int != NULL) {
dSP; /* Perl stack pointer */
/* first set up args */
args[0] = buf;
if(master->debug == TRUE) {
do_debug("Calling %s\n", PERL_OVER_SUB);
}
ENTER;
SAVETMPS;
PUSHMARK(SP);
status = perl_call_argv(PERL_OVER_SUB, G_VOID | G_EVAL | G_KEEPERR, args);
SPAGAIN;
if(SvTRUE(ERRSV)) {
error_log(ERRLOG_REPORT, killp_phrases[16], SvPV(ERRSV,PL_na), NULL);
POPs;
killperl_done(killp);
}
else if(status != 1) {
if(master->debug == TRUE) {
do_debug("return from perl_call_argv = %d\n", status);
}
error_log(ERRLOG_REPORT, killp_phrases[17], PERL_OVER_SUB, NULL);
killperl_done(killp);
}
PUTBACK;
FREETMPS;
LEAVE;
}
#endif
}
}
/*----------------------------------------------------------------------------------*/
int killprg_sendxover(PMaster master, char *linein) {
/* this is almost a carbon copy of chk_msg_kill_fork() */
int retval = FALSE, status, headerlen;
char keepyn, keep[4], len[KILLPRG_LENGTHLEN+1];
pid_t waitstatus;
PKillStruct pkill;
headerlen = strlen(linein);
pkill = master->xoverp;
/* first make sure our child is alive WNOHANG so if its alive, immed return */
keepyn = -1; /* our error status */
waitstatus = waitpid(pkill->child.Pid, &status, WNOHANG);
if(waitstatus == 0) { /* child alive */
if(master->debug == TRUE) {
do_debug("Writing to child\n");
}
/* first write the length down */
sprintf(len, "%-*d\n", KILLPRG_LENGTHLEN-1, headerlen);
if(write(pkill->child.Stdin, len, KILLPRG_LENGTHLEN) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[4], NULL);
}
/* then write the actual header */
else if(write(pkill->child.Stdin, linein, headerlen) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[4], NULL);
}
/* read the result back */
else {
if(master->debug == TRUE) {
do_debug("Reading from child\n");
}
if(read(pkill->child.Stdout, &keep, 2) <= 0) {
error_log(ERRLOG_REPORT, killp_phrases[5], NULL);
}
else {
if(master->debug == TRUE) {
keep[2] = '\0'; /* just in case */
do_debug("killprg: read '%s'\n", keep);
}
keepyn = keep[0] - '0'; /* convert ascii to 0/1 */
}
}
}
else if(waitstatus == -1) { /* huh? */
MyPerror( killp_phrases[6]);
}
else { /* child died */
error_log(ERRLOG_REPORT, killp_phrases[7], NULL);
}
retval = ( keepyn == 1) ? TRUE : FALSE;
return retval;
}
/*-----------------------------------------------------------------------------------*/
#ifdef PERL_EMBED
int killperl_sendxover(PMaster master, char *linein) {
/* this routine is almost a carbon copy of chk_msg_kill_perl() */
int i, retval = FALSE;
char *args[2] = { NULL, NULL};
dSP; /* Perl stack pointer */
/* first set up args */
args[0] = linein;
if(master->debug == TRUE) {
do_debug("Calling %s\n", PERL_XOVER_SUB);
}
ENTER;
SAVETMPS;
PUSHMARK(SP);
i = perl_call_argv(PERL_XOVER_SUB, G_SCALAR | G_EVAL | G_KEEPERR, args);
SPAGAIN;
if(SvTRUE(ERRSV)) {
error_log(ERRLOG_REPORT, killp_phrases[16], SvPV(ERRSV,PL_na), NULL);
POPs;
killperl_done(master->xoverp);
}
else if(i != 1) {
error_log(ERRLOG_REPORT, killp_phrases[17], PERL_XOVER_SUB, NULL);
killperl_done(master->xoverp);
}
else {
/* 0 = keep 1 = delete */
i = POPi;
if(master->debug == TRUE) {
do_debug("retval = %d\n", i);
}
retval = (i == 0) ? FALSE : TRUE;
}
PUTBACK;
FREETMPS;
LEAVE;
return retval;
}
#endif