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/*
* noshell: system(3) safe and effficient replacements
* Copyright (C) 2014-2023 Renzo Davoli. University of Bologna. <renzo@cs.unibo.it>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _GNU_SOURCE
#include <stdio.h>
#include <fcntl.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <execs.h>
struct system_execsq_t {
const char *path;
int *redir;
int flags;
};
static int system_execsq_f(char **argv, void *arg) {
struct system_execsq_t *v=arg;
int status;
pid_t pid;
switch (pid=fork()) {
case -1:
return -1;
case 0:
if (__builtin_expect(execs_fork_security && execs_fork_security(execs_fork_security_arg) != 0, 0))
_exit(127);
if (v->redir) {
int i;
for (i=0; i<3; i++) {
if (v->redir[i] >= 0 && v->redir[i] != i) {
dup2(v->redir[i],i);
close(v->redir[i]);
}
}
}
if (v->path) {
if (*v->path)
execv(v->path, argv);
else if (argv[0][0] == '/')
execv(argv[0], argv);
else
_exit(127);
} else
execvp(argv[0], argv);
_exit(127);
default:
waitpid(pid,&status,0);
return status;
}
}
int _system_common(const char *path, const char *command, int redir[3], int flags) {
struct system_execsq_t seqexec_var={path, redir, flags};
if (command) {
int rv = s2multiargv(command, system_execsq_f, &seqexec_var, flags);
return (rv == -1) ? W_EXITCODE(127, 0) : rv;
} else
return 1;
}
pid_t _coprocess_common(const char *path, const char *command,
char *const argv[], char *const envp[], int pipefd[2], int flags) {
if (command) {
int pfd_in[2];
int pfd_out[2];
pid_t pid;
if (pipe2(pfd_in, O_CLOEXEC) == -1 || pipe2(pfd_out, O_CLOEXEC) == -1)
return -1;
switch (pid=fork()) {
case -1:
return -1;
case 0:
if (__builtin_expect(execs_fork_security && execs_fork_security(execs_fork_security_arg) != 0, 0))
_exit(127);
if (dup2(pfd_in[0],0) == -1 || dup2(pfd_out[1],1) == -1)
_exit(127);
close(pfd_in[0]);
close(pfd_in[1]);
close(pfd_out[0]);
close(pfd_out[1]);
if (argv) {
if (path)
_execs_common(path, (const char *) argv, envp, NULL, flags);
else
_execs_common(command, (const char *) argv, envp, NULL, flags);
} else
_execs_common(path, command, envp, NULL, flags);
_exit(127);
default:
pipefd[0]=pfd_out[0];
pipefd[1]=pfd_in[1];
close(pfd_in[0]);
close(pfd_out[1]);
return pid;
}
} else
return 1;
}
struct popen_info {
FILE *stream;
pid_t pid;
struct popen_info *next;
};
static struct popen_info *popen_list;
FILE *_popen_common(const char *path, const char *command, const char *type, int flags) {
if ((type[0] == 'r' || type[0] == 'w') && (type[1] == 0 || type[1] == 'e')) {
int fd[2];
struct popen_info *new;
int streamno = (type[0] == 'r') ? STDIN_FILENO : STDOUT_FILENO;
if (pipe2(fd, O_CLOEXEC))
return NULL;
if ((new=malloc(sizeof(struct popen_info)))==NULL) {
errno = ENOMEM;
return NULL;
}
switch (new->pid = fork()) {
case -1:
close(fd[0]);
close(fd[1]);
free(new);
return NULL;
case 0:
if (__builtin_expect(execs_fork_security && execs_fork_security(execs_fork_security_arg) != 0, 0))
_exit(127);
dup2(fd[1-streamno],1-streamno);
close(fd[0]);
close(fd[1]);
if (path)
_execs_common(path,(char *) command,environ,(char *) command, flags);
else
_execs_common(NULL, (char *) command,environ,(char *) command, flags);
_exit(127);
default:
close(fd[1-streamno]);
if (type[1] == 'e')
fcntl(fd[streamno], F_SETFD, FD_CLOEXEC);
if ((new->stream = fdopen(fd[streamno], type)) == NULL) {
close(streamno);
free(new);
return NULL;
} else {
new->next = popen_list;
popen_list = new;
return new->stream;
}
}
} else {
errno = EINVAL;
return NULL;
}
}
int pclose_execs(FILE *stream) {
struct popen_info **pprev;
for (pprev = &popen_list; *pprev != NULL; pprev = &((*pprev)->next)) {
struct popen_info *curr = *pprev;
if (curr->stream == stream) {
int status;
pid_t waitrv;
*pprev = curr->next;
fclose(curr->stream);
while ((waitrv = waitpid(curr->pid, &status, 0)) == -1 && errno == EINTR)
;
free(curr);
if (waitrv != -1)
return status;
else {
errno = ECHILD;
return -1;
}
}
}
errno = EINVAL;
return -1;
}
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