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#include "bandwidthd.h"
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
extern struct config config;
static char *execute_extension(char * filename);
struct extensions *execute_extensions(void)
{
struct dirent **namelist;
int Counter, n;
struct stat statbuffer;
char *filename;
struct extensions *results = NULL;
struct extensions **resptr;
char *ptr;
resptr = &results;
n = scandir(EXTENSION_DIR, &namelist, 0, alphasort);
if (n < 0)
syslog(LOG_ERR, "Failed to open %s for executing extensions", EXTENSION_DIR);
else
{
for(Counter = 0; Counter < n; Counter++)
{
filename = malloc(strlen(EXTENSION_DIR)+strlen(namelist[Counter]->d_name)+2);
sprintf(filename, "%s/%s", EXTENSION_DIR, namelist[Counter]->d_name);
stat(filename, &statbuffer);
if (S_ISREG(statbuffer.st_mode))
{
ptr = execute_extension(filename);
if (ptr)
{
*resptr = malloc(sizeof(struct extensions));
(*resptr)->name = strdup(namelist[Counter]->d_name);
(*resptr)->value = ptr;
(*resptr)->next = NULL;
resptr = &((*resptr)->next);
}
}
free(filename);
free(namelist[Counter]);
}
free(namelist);
}
return(results);
}
static char *execute_extension(char *filename)
{
int ExtPipe[2];
pid_t extpid;
char buffer[1500];
char *res = NULL;
char *ptr;
ssize_t len;
int child;
int Counter;
fd_set rset;
fd_set eset;
if (pipe(ExtPipe))
{
syslog(LOG_ERR, "Failed to open pipe for extension processing");
return(NULL);
}
if (!(extpid = fork()))
{
close(ExtPipe[0]);
dup2(ExtPipe[1], 1);
execl(filename, filename, config.dev, NULL);
syslog(LOG_ERR, "Failed to launch extension %s", filename);
_exit(1);
}
close(ExtPipe[1]);
child = 1;
while (child)
{
child = !waitpid(extpid, NULL, WNOHANG);
// If child is running drop into a select and wait for data
if (child)
{
FD_ZERO(&rset);
FD_SET(ExtPipe[0], &rset);
FD_ZERO(&eset);
FD_SET(ExtPipe[0], &eset);
select(ExtPipe[0]+1, &rset, NULL, &eset, NULL);
}
len = 1;
while (len)
{
len = read(ExtPipe[0], buffer, 1499);
buffer[len] = '\0';
if (res)
{
ptr = malloc(strlen(res)+len+1);
sprintf(ptr, "%s%s", res, buffer);
free(res);
}
else
{
ptr = malloc(len+1);
sprintf(ptr, "%s", buffer);
}
res = ptr;
}
}
close(ExtPipe[0]);
// Trim whitespace from end
for(Counter = strlen(res)-1; Counter >= 0; Counter--)
{
if (res[Counter] == ' ' || res[Counter] == '\t' || res[Counter] == '\r' || res[Counter] == '\n')
res[Counter] = '\0';
else
break;
}
// Filter empty responses (Also filters all whitespace responses because of previouse trim)
if (strlen(res) < 1)
{
free(res);
return(NULL);
}
else
return(res);
}
void destroy_extension_data(struct extensions *ext)
{
struct extensions *ptr;
struct extensions *ptr2;
ptr = ext;
while(ptr)
{
if (ptr->name)
free(ptr->name);
if (ptr->value)
free(ptr->value);
ptr2 = ptr->next;
free(ptr);
ptr = ptr2;
}
}
/*
int main(void)
{
struct extensions *res;
struct extensions *resptr;
res = execute_extensions();
resptr = res;
while(resptr)
{
printf("%s\n", resptr->name);
printf("%s\n", resptr->value);
resptr = resptr->next;
}
destroy_extensions(res);
return(0);
}
*/
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