mirror of
https://github.com/php/php-src.git
synced 2024-09-22 10:27:25 +00:00
416 lines
9.9 KiB
C
416 lines
9.9 KiB
C
/*
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+----------------------------------------------------------------------+
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| PHP version 4.0 |
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+----------------------------------------------------------------------+
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| Copyright (c) 1997, 1998, 1999 The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.0 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available at through the world-wide-web at |
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| http://www.php.net/license/2_0.txt. |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Rasmus Lerdorf |
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+----------------------------------------------------------------------+
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*/
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/* $Id$ */
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#include <stdio.h>
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#include "php.h"
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#include <ctype.h>
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#include "php3_string.h"
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#include "safe_mode.h"
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#include "ext/standard/head.h"
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#include "exec.h"
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#include "php_globals.h"
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#include "SAPI.h"
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#if HAVE_SYS_WAIT_H
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#include <sys/wait.h>
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#endif
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/*
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* If type==0, only last line of output is returned (exec)
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* If type==1, all lines will be printed and last lined returned (system)
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* If type==2, all lines will be saved to given array (exec with &$array)
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* If type==3, output will be printed binary, no lines will be saved or returned (passthru)
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*
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*/
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static int _Exec(int type, char *cmd, pval *array, pval *return_value)
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{
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FILE *fp;
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char *buf, *tmp=NULL;
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int buflen = 0;
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int t, l, ret, output=1;
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int overflow_limit, lcmd, ldir;
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char *b, *c, *d=NULL;
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PLS_FETCH();
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buf = (char*) emalloc(EXEC_INPUT_BUF);
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if (!buf) {
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php_error(E_WARNING, "Unable to emalloc %d bytes for exec buffer", EXEC_INPUT_BUF);
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return -1;
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}
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buflen = EXEC_INPUT_BUF;
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if (PG(safe_mode)) {
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lcmd = strlen(cmd);
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ldir = strlen(PG(safe_mode_exec_dir));
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l = lcmd + ldir + 2;
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overflow_limit = l;
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c = strchr(cmd, ' ');
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if (c) *c = '\0';
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if (strstr(cmd, "..")) {
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php_error(E_WARNING, "No '..' components allowed in path");
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efree(buf);
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return -1;
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}
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d = emalloc(l);
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strcpy(d, PG(safe_mode_exec_dir));
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overflow_limit -= ldir;
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b = strrchr(cmd, '/');
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if (b) {
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strcat(d, b);
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overflow_limit -= strlen(b);
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} else {
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strcat(d, "/");
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strcat(d, cmd);
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overflow_limit-=(strlen(cmd)+1);
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}
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if (c) {
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*c = ' ';
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strncat(d, c, overflow_limit);
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}
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tmp = _php3_escapeshellcmd(d);
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efree(d);
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d = tmp;
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#if WIN32|WINNT
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fp = popen(d, "rb");
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#else
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fp = popen(d, "r");
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#endif
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if (!fp) {
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php_error(E_WARNING, "Unable to fork [%s]", d);
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efree(d);
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efree(buf);
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return -1;
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}
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} else { /* not safe_mode */
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#if WIN32|WINNT
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fp = popen(cmd, "rb");
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#else
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fp = popen(cmd, "r");
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#endif
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if (!fp) {
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php_error(E_WARNING, "Unable to fork [%s]", cmd);
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efree(buf);
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return -1;
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}
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}
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buf[0] = '\0';
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if (type==2) {
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if (array->type != IS_ARRAY) {
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pval_destructor(array);
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array_init(array);
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}
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}
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if (type != 3) {
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l=0;
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while ( !feof(fp) || l != 0 ) {
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l = 0;
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/* Read a line or fill the buffer, whichever comes first */
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do {
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if ( buflen <= (l+1) ) {
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buf = erealloc(buf, buflen + EXEC_INPUT_BUF);
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if ( buf == NULL ) {
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php_error(E_WARNING, "Unable to erealloc %d bytes for exec buffer",
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buflen + EXEC_INPUT_BUF);
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return -1;
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}
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buflen += EXEC_INPUT_BUF;
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}
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if ( fgets(&(buf[l]), buflen - l, fp) == NULL ) {
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/* eof */
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break;
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}
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l += strlen(&(buf[l]));
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} while ( (l > 0) && (buf[l-1] != '\n') );
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if ( feof(fp) && (l == 0) ) {
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break;
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}
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if (type == 1) {
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SLS_FETCH();
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if (output) PUTS(buf);
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#if APACHE
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# if MODULE_MAGIC_NUMBER > 19970110
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if (output) rflush(((request_rec *) SG(server_context)));
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# else
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if (output) bflush(((request_rec *) SG(server_context))->connection->client);
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# endif
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#endif
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#if CGI_BINARY
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fflush(stdout);
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#endif
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#if FHTTPD
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/* fhttpd doesn't flush */
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#endif
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#if USE_SAPI
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sapi_rqst->flush(sapi_rqst->scid);
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#endif
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}
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else if (type == 2) {
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/* strip trailing whitespaces */
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l = strlen(buf);
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t = l;
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while (l-- && isspace((int)buf[l]));
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if (l < t) {
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buf[l + 1] = '\0';
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}
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add_next_index_string(array, buf, 1);
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}
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}
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/* strip trailing spaces */
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l = strlen(buf);
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t = l;
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while (l && isspace((int)buf[--l]));
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if (l < t) buf[l + 1] = '\0';
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} else {
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int b, i;
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while ((b = fread(buf, 1, sizeof(buf), fp)) > 0) {
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for (i = 0; i < b; i++)
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if (output) PUTC(buf[i]);
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}
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}
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/* Return last line from the shell command */
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if (PG(magic_quotes_runtime) && type!=3) {
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int len;
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tmp = php_addslashes(buf, 0, &len, 0);
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RETVAL_STRINGL(tmp,len,0);
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} else {
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RETVAL_STRING(buf,1);
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}
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ret = pclose(fp);
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#if HAVE_SYS_WAIT_H
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if (WIFEXITED(ret)) {
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ret = WEXITSTATUS(ret);
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}
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#endif
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if (d) efree(d);
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efree(buf);
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return ret;
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}
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/* {{{ proto int exec(string command [, array output [, int return_value]])
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Execute an external program */
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PHP_FUNCTION(exec)
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{
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pval *arg1, *arg2, *arg3;
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int arg_count = ARG_COUNT(ht);
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int ret;
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if (arg_count > 3 || getParameters(ht, arg_count, &arg1, &arg2, &arg3) == FAILURE) {
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WRONG_PARAM_COUNT;
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}
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switch (arg_count) {
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case 1:
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ret = _Exec(0, arg1->value.str.val, NULL, return_value);
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break;
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case 2:
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if (!ParameterPassedByReference(ht,2)) {
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php_error(E_WARNING,"Array argument to exec() not passed by reference");
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}
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ret = _Exec(2, arg1->value.str.val, arg2, return_value);
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break;
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case 3:
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if (!ParameterPassedByReference(ht,2)) {
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php_error(E_WARNING,"Array argument to exec() not passed by reference");
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}
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if (!ParameterPassedByReference(ht,3)) {
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php_error(E_WARNING,"return_status argument to exec() not passed by reference");
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}
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ret = _Exec(2, arg1->value.str.val, arg2, return_value);
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arg3->type = IS_LONG;
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arg3->value.lval=ret;
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break;
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}
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}
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/* }}} */
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/* {{{ proto int system(string command [, int return_value])
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Execute an external program and display output */
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PHP_FUNCTION(system)
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{
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pval *arg1, *arg2;
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int arg_count = ARG_COUNT(ht);
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int ret;
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if (arg_count > 2 || getParameters(ht, arg_count, &arg1, &arg2) == FAILURE) {
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WRONG_PARAM_COUNT;
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}
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switch (arg_count) {
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case 1:
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ret = _Exec(1, arg1->value.str.val, NULL, return_value);
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break;
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case 2:
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if (!ParameterPassedByReference(ht,2)) {
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php_error(E_WARNING,"return_status argument to system() not passed by reference");
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}
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ret = _Exec(1, arg1->value.str.val, NULL, return_value);
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arg2->type = IS_LONG;
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arg2->value.lval=ret;
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break;
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}
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}
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/* }}} */
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/* {{{ proto int passthru(string command [, int return_value])
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Execute an external program and display raw output */
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PHP_FUNCTION(passthru)
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{
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pval *arg1, *arg2;
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int arg_count = ARG_COUNT(ht);
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int ret;
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if (arg_count > 2 || getParameters(ht, arg_count, &arg1, &arg2) == FAILURE) {
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WRONG_PARAM_COUNT;
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}
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switch (arg_count) {
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case 1:
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ret = _Exec(3, arg1->value.str.val, NULL, return_value);
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break;
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case 2:
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if (!ParameterPassedByReference(ht,2)) {
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php_error(E_WARNING,"return_status argument to system() not passed by reference");
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}
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ret = _Exec(3, arg1->value.str.val, NULL, return_value);
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arg2->type = IS_LONG;
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arg2->value.lval=ret;
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break;
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}
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}
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/* }}} */
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static int php3_ind(char *s, char c)
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{
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register int x;
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for (x = 0; s[x]; x++)
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if (s[x] == c)
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return x;
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return -1;
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}
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/* Escape all chars that could possibly be used to
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break out of a shell command
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This function emalloc's a string and returns the pointer.
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Remember to efree it when done with it.
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*NOT* safe for binary strings
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*/
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char * _php3_escapeshellcmd(char *str) {
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register int x, y, l;
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char *cmd;
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l = strlen(str);
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cmd = emalloc(2 * l + 1);
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strcpy(cmd, str);
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for (x = 0; cmd[x]; x++) {
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if (php3_ind("&;`'\"|*?~<>^()[]{}$\\\x0A\xFF", cmd[x]) != -1) {
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for (y = l + 1; y > x; y--)
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cmd[y] = cmd[y - 1];
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l++; /* length has been increased */
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cmd[x] = '\\';
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x++; /* skip the character */
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}
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}
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return cmd;
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}
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/* {{{ proto escapeshellcmd(string command)
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escape shell metacharacters */
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PHP_FUNCTION(escapeshellcmd)
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{
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pval *arg1;
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char *cmd = NULL;
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if (getParameters(ht, 1, &arg1) == FAILURE) {
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WRONG_PARAM_COUNT;
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}
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convert_to_string(arg1);
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if (arg1->value.str.len) {
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cmd = _php3_escapeshellcmd(arg1->value.str.val);
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RETVAL_STRING(cmd, 1);
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efree(cmd);
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}
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}
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/* }}} */
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PHP_FUNCTION(shell_exec)
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{
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FILE *in;
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int readbytes,total_readbytes=0,allocated_space;
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pval *cmd;
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PLS_FETCH();
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if (ARG_COUNT(ht)!=1 || getParameters(ht, 1, &cmd)==FAILURE) {
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WRONG_PARAM_COUNT;
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}
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if (PG(safe_mode)) {
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php_error(E_WARNING,"Cannot execute using backquotes in safe mode");
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RETURN_FALSE;
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}
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convert_to_string(cmd);
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#if WIN32|WINNT
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if ((in=popen(cmd->value.str.val,"rt"))==NULL) {
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#else
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if ((in=popen(cmd->value.str.val,"r"))==NULL) {
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#endif
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php_error(E_WARNING,"Unable to execute '%s'",cmd->value.str.val);
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}
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allocated_space = EXEC_INPUT_BUF;
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return_value->value.str.val = (char *) emalloc(allocated_space);
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while (1) {
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readbytes = fread(return_value->value.str.val+total_readbytes,1,EXEC_INPUT_BUF,in);
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if (readbytes<=0) {
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break;
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}
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total_readbytes += readbytes;
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allocated_space = total_readbytes+EXEC_INPUT_BUF;
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return_value->value.str.val = (char *) erealloc(return_value->value.str.val,allocated_space);
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}
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fclose(in);
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return_value->value.str.val = erealloc(return_value->value.str.val,total_readbytes+1);
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return_value->value.str.val[total_readbytes]=0;
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return_value->value.str.len = total_readbytes;
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return_value->type = IS_STRING;
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}
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* End:
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*/
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