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/* filter.c: filter framework functions
*
* Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
*
* Licensed under GNU General Public License v2
* (see COPYING for full license text)
*/
#include "cgit.h"
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <string.h>
#include <stdlib.h>
static int open_exec_filter(struct cgit_filter *base, va_list ap)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
int i;
for (i = 0; i < filter->extra_args; i++)
filter->argv[i+1] = va_arg(ap, char *);
filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
"Unable to duplicate STDOUT");
chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
if (filter->pid == 0) {
close(filter->pipe_fh[1]);
chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
"Unable to use pipe as STDIN");
execvp(filter->cmd, filter->argv);
die_errno("Unable to exec subprocess %s", filter->cmd);
}
close(filter->pipe_fh[0]);
chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
"Unable to use pipe as STDOUT");
close(filter->pipe_fh[1]);
return 0;
}
static int close_exec_filter(struct cgit_filter *base)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
int i, exit_status;
chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
"Unable to restore STDOUT");
close(filter->old_stdout);
if (filter->pid < 0)
goto done;
waitpid(filter->pid, &exit_status, 0);
if (WIFEXITED(exit_status) && !WEXITSTATUS(exit_status))
goto done;
die("Subprocess %s exited abnormally", filter->cmd);
done:
for (i = 0; i < filter->extra_args; i++)
filter->argv[i+1] = NULL;
return 0;
}
static void fprintf_exec_filter(struct cgit_filter *base, FILE *f, const char *prefix)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *) base;
fprintf(f, "%s%s\n", prefix, filter->cmd);
}
int cgit_open_filter(struct cgit_filter *filter, ...)
{
int result;
va_list ap;
va_start(ap, filter);
result = filter->open(filter, ap);
va_end(ap);
return result;
}
int cgit_close_filter(struct cgit_filter *filter)
{
return filter->close(filter);
}
void cgit_fprintf_filter(struct cgit_filter *filter, FILE *f, const char *prefix)
{
filter->fprintf(filter, f, prefix);
}
void cgit_exec_filter_init(struct cgit_exec_filter *filter, char *cmd, char **argv)
{
memset(filter, 0, sizeof(*filter));
filter->base.open = open_exec_filter;
filter->base.close = close_exec_filter;
filter->base.fprintf = fprintf_exec_filter;
filter->cmd = cmd;
filter->argv = argv;
}
static struct cgit_filter *new_exec_filter(const char *cmd, filter_type filtertype)
{
struct cgit_exec_filter *f;
int args_size = 0;
f = xmalloc(sizeof(*f));
/* We leave argv for now and assign it below. */
cgit_exec_filter_init(f, xstrdup(cmd), NULL);
switch (filtertype) {
case SOURCE:
case ABOUT:
f->extra_args = 1;
break;
case COMMIT:
default:
f->extra_args = 0;
break;
}
args_size = (2 + f->extra_args) * sizeof(char *);
f->argv = xmalloc(args_size);
memset(f->argv, 0, args_size);
f->argv[0] = f->cmd;
return &f->base;
}
struct cgit_filter *cgit_new_filter(const char *cmd, filter_type filtertype)
{
if (!cmd || !cmd[0])
return NULL;
return new_exec_filter(cmd, filtertype);
}
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