1/*
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * This code is derived from software written by Ken Arnold and
6 * published in UNIX Review, Vol. 6, No. 8.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by the University of
19 *	California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 */
37
38#ifdef HAVE_CONFIG_H
39#include <config.h>
40RCSID("$Id$");
41#endif
42
43#include <sys/types.h>
44#ifdef TIME_WITH_SYS_TIME
45#include <sys/time.h>
46#include <time.h>
47#elif defined(HAVE_SYS_TIME_H)
48#include <sys/time.h>
49#else
50#include <time.h>
51#endif
52#ifdef HAVE_SYS_RESOURCE_H
53#include <sys/resource.h>
54#endif
55#include <sys/wait.h>
56
57#include <errno.h>
58#include <glob.h>
59#include <signal.h>
60#include <stdio.h>
61#include <stdlib.h>
62#include <string.h>
63#include <unistd.h>
64#include <roken.h>
65#include "extern.h"
66
67
68/*
69 * Special version of popen which avoids call to shell.  This ensures
70 * no one may create a pipe to a hidden program as a side effect of a
71 * list or dir command.
72 */
73static int *pids;
74static int fds;
75
76/* return path prepended with ~ftp if that file exists, otherwise
77 * return path unchanged
78 */
79
80const char *
81ftp_rooted(const char *path)
82{
83    static char home[MaxPathLen] = "";
84    static char newpath[MaxPathLen];
85    struct passwd *pwd;
86
87    if(!home[0])
88	if((pwd = k_getpwnam("ftp")))
89	    strlcpy(home, pwd->pw_dir, sizeof(home));
90    snprintf(newpath, sizeof(newpath), "%s/%s", home, path);
91    if(access(newpath, X_OK))
92	strlcpy(newpath, path, sizeof(newpath));
93    return newpath;
94}
95
96
97#define MAXARGS	100
98#define MAXGLOBS 1000
99
100FILE *
101ftpd_popen(char *program, char *type, int do_stderr, int no_glob)
102{
103	char *cp;
104	FILE *iop;
105	int argc, gargc, pdes[2], pid;
106	char **pop, *argv[MAXARGS], *gargv[MAXGLOBS];
107	char *foo;
108
109	if (strcmp(type, "r") && strcmp(type, "w"))
110		return (NULL);
111
112	if (!pids) {
113
114	    /* This function is ugly and should be rewritten, in
115	     * modern unices there is no such thing as a maximum
116	     * filedescriptor.
117	     */
118
119	    fds = getdtablesize();
120	    pids = (int*)calloc(fds, sizeof(int));
121	    if(!pids)
122		return NULL;
123	}
124	if (pipe(pdes) < 0)
125		return (NULL);
126
127	/* break up string into pieces */
128	foo = NULL;
129	for (argc = 0, cp = program; argc < MAXARGS - 1; cp = NULL) {
130		if (!(argv[argc++] = strtok_r(cp, " \t\n", &foo)))
131			break;
132	}
133	argv[MAXARGS - 1] = NULL;
134
135	gargv[0] = (char*)ftp_rooted(argv[0]);
136	/* glob each piece */
137	for (gargc = argc = 1; argv[argc] && gargc < MAXGLOBS - 1; argc++) {
138		glob_t gl;
139		int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE
140		    |
141#ifdef GLOB_MAXPATH
142	GLOB_MAXPATH
143#else
144	GLOB_LIMIT
145#endif
146		    ;
147
148		memset(&gl, 0, sizeof(gl));
149		if (no_glob ||
150		    glob(argv[argc], flags, NULL, &gl) ||
151		    gl.gl_pathc == 0)
152			gargv[gargc++] = strdup(argv[argc]);
153		else
154			for (pop = gl.gl_pathv;
155			     *pop && gargc < MAXGLOBS - 1;
156			     pop++)
157				gargv[gargc++] = strdup(*pop);
158		globfree(&gl);
159	}
160	gargv[gargc] = NULL;
161
162	iop = NULL;
163	switch(pid = fork()) {
164	case -1:			/* error */
165		close(pdes[0]);
166		close(pdes[1]);
167		goto pfree;
168		/* NOTREACHED */
169	case 0:				/* child */
170		if (*type == 'r') {
171			if (pdes[1] != STDOUT_FILENO) {
172				dup2(pdes[1], STDOUT_FILENO);
173				close(pdes[1]);
174			}
175			if(do_stderr)
176			    dup2(STDOUT_FILENO, STDERR_FILENO);
177			close(pdes[0]);
178		} else {
179			if (pdes[0] != STDIN_FILENO) {
180				dup2(pdes[0], STDIN_FILENO);
181				close(pdes[0]);
182			}
183			close(pdes[1]);
184		}
185		execv(gargv[0], gargv);
186		gargv[0] = argv[0];
187		execv(gargv[0], gargv);
188		_exit(1);
189	}
190	/* parent; assume fdopen can't fail...  */
191	if (*type == 'r') {
192		iop = fdopen(pdes[0], type);
193		close(pdes[1]);
194	} else {
195		iop = fdopen(pdes[1], type);
196		close(pdes[0]);
197	}
198	pids[fileno(iop)] = pid;
199
200pfree:
201	for (argc = 1; gargv[argc] != NULL; argc++)
202	    free(gargv[argc]);
203
204
205	return (iop);
206}
207
208int
209ftpd_pclose(FILE *iop)
210{
211	int fdes, status;
212	pid_t pid;
213	sigset_t sigset, osigset;
214
215	/*
216	 * pclose returns -1 if stream is not associated with a
217	 * `popened' command, or, if already `pclosed'.
218	 */
219	if (pids == 0 || pids[fdes = fileno(iop)] == 0)
220		return (-1);
221	fclose(iop);
222	sigemptyset(&sigset);
223	sigaddset(&sigset, SIGINT);
224	sigaddset(&sigset, SIGQUIT);
225	sigaddset(&sigset, SIGHUP);
226	sigprocmask(SIG_BLOCK, &sigset, &osigset);
227	while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
228		continue;
229	sigprocmask(SIG_SETMASK, &osigset, NULL);
230	pids[fdes] = 0;
231	if (pid < 0)
232		return (pid);
233	if (WIFEXITED(status))
234		return (WEXITSTATUS(status));
235	return (1);
236}
237