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/* CWirc - X-Chat plugin for sending and receiving raw morse code over IRC
(c) Pierre-Philippe Coupard - 18/06/2003
CWirc extensions routines
This program is distributed under the terms of the GNU General Public License
See the COPYING file for details
*/
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "types.h"
#include "cwirc.h"
#include "extension.h"
#include "ipc.h"
#include "common.h"
/* Variables */
char cwirc_extensions[MAX_CWIRC_EXTENSIONS][FILENAME_MAX];
/* Browse the CWirc extensions directory and store filenames present there */
void get_available_cwirc_extensions(void)
{
DIR *extdir;
struct dirent *dirent;
struct stat statbuf;
char fullpathname[FILENAME_MAX];
int i;
/* Initialize the extensions table */
for(i=0;i<MAX_CWIRC_EXTENSIONS;i++)
cwirc_extensions[i][0]=0;
/* Open the extensions directory */
if((extdir=opendir(EXTENSIONS_DIR))==NULL)
return;
/* Browse the content of the directory */
for(i=0;i<MAX_CWIRC_EXTENSIONS && (dirent=readdir(extdir))!=NULL;)
{
/* Is the directory entry an executable file ? */
sprintf(fullpathname,"%s/%s",EXTENSIONS_DIR,dirent->d_name);
if(stat(fullpathname,&statbuf)!=-1 && S_ISREG(statbuf.st_mode) &&
!access(fullpathname,X_OK))
{
strncpy(cwirc_extensions[i],dirent->d_name,FILENAME_MAX-1);
cwirc_extensions[i][FILENAME_MAX-1]=0;
i++;
}
}
/* Close the directory */
closedir(extdir);
}
/* Execute an extension program, passing it "--cwirc" as first argument, and
the extension API's shared memory id as second argument. Return NULL or
an error message. */
char *exec_extension_program(char *fname,int ext_shmid)
{
static char errmsg[64];
struct cwirc_extension_api *ext_sharedmem;
char fullpathname[FILENAME_MAX];
int pid;
/* Attach to the extension API's shared memory block */
if((ext_sharedmem=(struct cwirc_extension_api *)cwirc_shm_attach(ext_shmid))
==(struct cwirc_extension_api *)-1)
{
strcpy(errmsg,"Error : can't attach to the extension API's shared memory.");
return(errmsg);
}
/* If an extension process is already running, abort */
if(ext_sharedmem->pid!=-1)
{
cwirc_shm_detach(ext_sharedmem);
strcpy(errmsg,"An extension program is already running.");
return(errmsg);
}
/* Spawn the extension program */
switch((pid=fork()))
{
case -1:
strcpy(errmsg,"Error : fork() : Cannot spawn the extension process.");
return(errmsg);
break;
case 0: /* I'm the child */
/* Close the extension program's stdout so it doesn't trickle down to the
X-Chat window */
close(1);
/* Detach from the extension API's shared memory block */
cwirc_shm_detach(ext_sharedmem);
/* Execute the extension program */
sprintf(errmsg,"0x%0x",ext_shmid); /* Reuse errmsg to store the shm id */
sprintf(fullpathname,"%s/%s",EXTENSIONS_DIR,fname);
execl(fullpathname,fname,"--cwirc",errmsg,NULL);
fprintf(stderr,"Error : cannot execute \"%s\".\n",fullpathname);
fflush(stderr);
sleep(1); /* Give the parent a change to catch us dying prematurely */
_exit(0);
break;
}
ext_sharedmem->pid=pid;
/* Detach from the extension API's shared memory block */
cwirc_shm_detach(ext_sharedmem);
return(NULL);
}
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