BSD 4.4 Lite Libexec Sources

1 files changed, 171 insertions, 0 deletions

diff --git a/libexec/ftpd/popen.c b/libexec/ftpd/popen.c
new file mode 100644
index 0000000..b26732e
--- /dev/null
+++ b/libexec/ftpd/popen.c
@@ -0,0 +1,171 @@
+/*
+ * Copyright (c) 1988, 1993, 1994
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software written by Ken Arnold and
+ * published in UNIX Review, Vol. 6, No. 8.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the University of
+ *	California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+
+#ifndef lint
+static char sccsid[] = "@(#)popen.c	8.3 (Berkeley) 4/6/94";
+#endif /* not lint */
+
+#include <sys/types.h>
+#include <sys/wait.h>
+
+#include <errno.h>
+#include <glob.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+#include "extern.h"
+
+/*
+ * Special version of popen which avoids call to shell.  This ensures noone
+ * may create a pipe to a hidden program as a side effect of a list or dir
+ * command.
+ */
+static int *pids;
+static int fds;
+
+FILE *
+ftpd_popen(program, type)
+	char *program, *type;
+{
+	char *cp;
+	FILE *iop;
+	int argc, gargc, pdes[2], pid;
+	char **pop, *argv[100], *gargv[1000];
+
+	if (*type != 'r' && *type != 'w' || type[1])
+		return (NULL);
+
+	if (!pids) {
+		if ((fds = getdtablesize()) <= 0)
+			return (NULL);
+		if ((pids = (int *)malloc((u_int)(fds * sizeof(int)))) == NULL)
+			return (NULL);
+		memset(pids, 0, fds * sizeof(int));
+	}
+	if (pipe(pdes) < 0)
+		return (NULL);
+
+	/* break up string into pieces */
+	for (argc = 0, cp = program;; cp = NULL)
+		if (!(argv[argc++] = strtok(cp, " \t\n")))
+			break;
+
+	/* glob each piece */
+	gargv[0] = argv[0];
+	for (gargc = argc = 1; argv[argc]; argc++) {
+		glob_t gl;
+		int flags = GLOB_BRACE|GLOB_NOCHECK|GLOB_QUOTE|GLOB_TILDE;
+
+		memset(&gl, 0, sizeof(gl));
+		if (glob(argv[argc], flags, NULL, &gl))
+			gargv[gargc++] = strdup(argv[argc]);
+		else
+			for (pop = gl.gl_pathv; *pop; pop++)
+				gargv[gargc++] = strdup(*pop);
+		globfree(&gl);
+	}
+	gargv[gargc] = NULL;
+
+	iop = NULL;
+	switch(pid = vfork()) {
+	case -1:			/* error */
+		(void)close(pdes[0]);
+		(void)close(pdes[1]);
+		goto pfree;
+		/* NOTREACHED */
+	case 0:				/* child */
+		if (*type == 'r') {
+			if (pdes[1] != STDOUT_FILENO) {
+				dup2(pdes[1], STDOUT_FILENO);
+				(void)close(pdes[1]);
+			}
+			dup2(STDOUT_FILENO, STDERR_FILENO); /* stderr too! */
+			(void)close(pdes[0]);
+		} else {
+			if (pdes[0] != STDIN_FILENO) {
+				dup2(pdes[0], STDIN_FILENO);
+				(void)close(pdes[0]);
+			}
+			(void)close(pdes[1]);
+		}
+		execv(gargv[0], gargv);
+		_exit(1);
+	}
+	/* parent; assume fdopen can't fail...  */
+	if (*type == 'r') {
+		iop = fdopen(pdes[0], type);
+		(void)close(pdes[1]);
+	} else {
+		iop = fdopen(pdes[1], type);
+		(void)close(pdes[0]);
+	}
+	pids[fileno(iop)] = pid;
+
+pfree:	for (argc = 1; gargv[argc] != NULL; argc++)
+		free(gargv[argc]);
+
+	return (iop);
+}
+
+int
+ftpd_pclose(iop)
+	FILE *iop;
+{
+	int fdes, omask, status;
+	pid_t pid;
+
+	/*
+	 * pclose returns -1 if stream is not associated with a
+	 * `popened' command, or, if already `pclosed'.
+	 */
+	if (pids == 0 || pids[fdes = fileno(iop)] == 0)
+		return (-1);
+	(void)fclose(iop);
+	omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
+	while ((pid = waitpid(pids[fdes], &status, 0)) < 0 && errno == EINTR)
+		continue;
+	(void)sigsetmask(omask);
+	pids[fdes] = 0;
+	if (pid < 0)
+		return (pid);
+	if (WIFEXITED(status))
+		return (WEXITSTATUS(status));
+	return (1);
+}