use setreuid to retain setuid uid for cleanup of lock files

[unix-history] / usr / src / usr.bin / ftp / cmds.c

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 */

#ifndef lint
static char sccsid[] = "@(#)cmds.c	5.2 (Berkeley) %G%";
#endif not lint

/*
 * FTP User Program -- Command Routines.
 */
#include <sys/param.h>
#include <sys/socket.h>

#include <arpa/ftp.h>

#include <signal.h>
#include <stdio.h>
#include <errno.h>
#include <netdb.h>

#include "ftp_var.h"

extern	char *globerr;
extern	char **glob();
extern	char *home;
extern	short gflag;
extern	char *remglob();
extern	char *getenv();
extern	char *index();
extern	char *rindex();

/*
 * Connect to peer server and
 * auto-login, if possible.
 */
setpeer(argc, argv)
	int argc;
	char *argv[];
{
	char *host, *hookup();
	int port;

	if (connected) {
		printf("Already connected to %s, use disconnect first.\n",
			hostname);
		return;
	}
	if (argc < 2) {
		strcat(line, " ");
		printf("(to) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc > 3) {
		printf("usage: %s host-name [port]\n", argv[0]);
		return;
	}
	port = sp->s_port;
	if (argc > 2) {
		port = atoi(argv[2]);
		if (port <= 0) {
			printf("%s: bad port number-- %s\n", argv[1], argv[2]);
			printf ("usage: %s host-name [port]\n", argv[0]);
			return;
		}
		port = htons(port);
	}
	host = hookup(argv[1], port);
	if (host) {
		connected = 1;
		if (autologin)
			login(host);
	}
}

struct	types {
	char	*t_name;
	char	*t_mode;
	int	t_type;
	char	*t_arg;
} types[] = {
	{ "ascii",	"A",	TYPE_A,	0 },
	{ "binary",	"I",	TYPE_I,	0 },
	{ "image",	"I",	TYPE_I,	0 },
	{ "ebcdic",	"E",	TYPE_E,	0 },
	{ "tenex",	"L",	TYPE_L,	bytename },
	0
};

/*
 * Set transfer type.
 */
settype(argc, argv)
	char *argv[];
{
	register struct types *p;
	int comret;

	if (argc > 2) {
		char *sep;

		printf("usage: %s [", argv[0]);
		sep = " ";
		for (p = types; p->t_name; p++) {
			printf("%s%s", sep, p->t_name);
			if (*sep == ' ')
				sep = " | ";
		}
		printf(" ]\n");
		return;
	}
	if (argc < 2) {
		printf("Using %s mode to transfer files.\n", typename);
		return;
	}
	for (p = types; p->t_name; p++)
		if (strcmp(argv[1], p->t_name) == 0)
			break;
	if (p->t_name == 0) {
		printf("%s: unknown mode\n", argv[1]);
		return;
	}
	if ((p->t_arg != NULL) && (*(p->t_arg) != '\0'))
		comret = command ("TYPE %s %s", p->t_mode, p->t_arg);
	else
		comret = command("TYPE %s", p->t_mode);
	if (comret == COMPLETE) {
		strcpy(typename, p->t_name);
		type = p->t_type;
	}
}

/*
 * Set binary transfer type.
 */
/*VARARGS*/
setbinary()
{

	call(settype, "type", "binary", 0);
}

/*
 * Set ascii transfer type.
 */
/*VARARGS*/
setascii()
{

	call(settype, "type", "ascii", 0);
}

/*
 * Set tenex transfer type.
 */
/*VARARGS*/
settenex()
{

	call(settype, "type", "tenex", 0);
}

/*
 * Set ebcdic transfer type.
 */
/*VARARGS*/
setebcdic()
{

	call(settype, "type", "ebcdic", 0);
}

/*
 * Set file transfer mode.
 */
setmode(argc, argv)
	char *argv[];
{

	printf("We only support %s mode, sorry.\n", modename);
}

/*
 * Set file transfer format.
 */
setform(argc, argv)
	char *argv[];
{

	printf("We only support %s format, sorry.\n", formname);
}

/*
 * Set file transfer structure.
 */
setstruct(argc, argv)
	char *argv[];
{

	printf("We only support %s structure, sorry.\n", structname);
}

/*
 * Send a single file.
 */
put(argc, argv)
	int argc;
	char *argv[];
{
	char *cmd;

	if (argc == 2)
		argc++, argv[2] = argv[1];
	if (argc < 2) {
		strcat(line, " ");
		printf("(local-file) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
usage:
		printf("%s local-file remote-file\n", argv[0]);
		return;
	}
	if (argc < 3) {
		strcat(line, " ");
		printf("(remote-file) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 3) 
		goto usage;
	if (!globulize(&argv[1]))
		return;
	cmd = (argv[0][0] == 'a') ? "APPE" : "STOR";
	sendrequest(cmd, argv[1], argv[2]);
}

/*
 * Send multiple files.
 */
mput(argc, argv)
	char *argv[];
{
	register int i;

	if (argc < 2) {
		strcat(line, " ");
		printf("(local-files) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s local-files\n", argv[0]);
		return;
	}
	for (i = 1; i < argc; i++) {
		register char **cpp, **gargs;

		if (!doglob) {
			if (confirm(argv[0], argv[i]))
				sendrequest("STOR", argv[i], argv[i]);
			continue;
		}
		gargs = glob(argv[i]);
		if (globerr != NULL) {
			printf("%s\n", globerr);
			if (gargs)
				blkfree(gargs);
			continue;
		}
		for (cpp = gargs; cpp && *cpp != NULL; cpp++)
			if (confirm(argv[0], *cpp))
				sendrequest("STOR", *cpp, *cpp);
		if (gargs != NULL)
			blkfree(gargs);
	}
}

/*
 * Receive one file.
 */
get(argc, argv)
	char *argv[];
{

	if (argc == 2)
		argc++, argv[2] = argv[1];
	if (argc < 2) {
		strcat(line, " ");
		printf("(remote-file) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
usage:
		printf("%s remote-file [ local-file ]\n", argv[0]);
		return;
	}
	if (argc < 3) {
		strcat(line, " ");
		printf("(local-file) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 3) 
		goto usage;
	if (!globulize(&argv[2]))
		return;
	recvrequest("RETR", argv[2], argv[1], "w");
}

/*
 * Get multiple files.
 */
mget(argc, argv)
	char *argv[];
{
	char *cp;

	if (argc < 2) {
		strcat(line, " ");
		printf("(remote-files) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s remote-files\n", argv[0]);
		return;
	}
	while ((cp = remglob(argc, argv)) != NULL)
		if (confirm(argv[0], cp))
			recvrequest("RETR", cp, cp, "w");
}

char *
remglob(argc, argv)
	char *argv[];
{
	char temp[16];
	static char buf[MAXPATHLEN];
	static FILE *ftemp = NULL;
	static char **args;
	int oldverbose, oldhash;
	char *cp, *mode;

	if (!doglob) {
		if (args == NULL)
			args = argv;
		if ((cp = *++args) == NULL)
			args = NULL;
		return (cp);
	}
	if (ftemp == NULL) {
		strcpy(temp, "/tmp/ftpXXXXXX");
		mktemp(temp);
		oldverbose = verbose, verbose = 0;
		oldhash = hash, hash = 0;
		for (mode = "w"; *++argv != NULL; mode = "a")
			recvrequest ("NLST", temp, *argv, mode);
		verbose = oldverbose; hash = oldhash;
		ftemp = fopen(temp, "r");
		unlink(temp);
		if (ftemp == NULL) {
			printf("can't find list of remote files, oops\n");
			return (NULL);
		}
	}
	if (fgets(buf, sizeof (buf), ftemp) == NULL) {
		fclose(ftemp), ftemp = NULL;
		return (NULL);
	}
	if ((cp = index(buf, '\n')) != NULL)
		*cp = '\0';
	return (buf);
}

char *
onoff(bool)
	int bool;
{

	return (bool ? "on" : "off");
}

/*
 * Show status.
 */
status(argc, argv)
	char *argv[];
{

	if (connected)
		printf("Connected to %s.\n", hostname);
	else
		printf("Not connected.\n");
	printf("Mode: %s; Type: %s; Form: %s; Structure: %s\n",
		modename, typename, formname, structname);
	printf("Verbose: %s; Bell: %s; Prompting: %s; Globbing: %s\n", 
		onoff(verbose), onoff(bell), onoff(interactive),
		onoff(doglob));
	printf("Hash mark printing: %s; Use of PORT cmds: %s\n",
		onoff(hash), onoff(sendport));
}

/*
 * Set beep on cmd completed mode.
 */
/*VARARGS*/
setbell()
{

	bell = !bell;
	printf("Bell mode %s.\n", onoff(bell));
}

/*
 * Turn on packet tracing.
 */
/*VARARGS*/
settrace()
{

	trace = !trace;
	printf("Packet tracing %s.\n", onoff(trace));
}

/*
 * Toggle hash mark printing during transfers.
 */
/*VARARGS*/
sethash()
{

	hash = !hash;
	printf("Hash mark printing %s", onoff(hash));
	if (hash)
		printf(" (%d bytes/hash mark)", BUFSIZ);
	printf(".\n");
}

/*
 * Turn on printing of server echo's.
 */
/*VARARGS*/
setverbose()
{

	verbose = !verbose;
	printf("Verbose mode %s.\n", onoff(verbose));
}

/*
 * Toggle PORT cmd use before each data connection.
 */
/*VARARGS*/
setport()
{

	sendport = !sendport;
	printf("Use of PORT cmds %s.\n", onoff(sendport));
}

/*
 * Turn on interactive prompting
 * during mget, mput, and mdelete.
 */
/*VARARGS*/
setprompt()
{

	interactive = !interactive;
	printf("Interactive mode %s.\n", onoff(interactive));
}

/*
 * Toggle metacharacter interpretation
 * on local file names.
 */
/*VARARGS*/
setglob()
{
	
	doglob = !doglob;
	printf("Globbing %s.\n", onoff(doglob));
}

/*
 * Set debugging mode on/off and/or
 * set level of debugging.
 */
/*VARARGS*/
setdebug(argc, argv)
	char *argv[];
{
	int val;

	if (argc > 1) {
		val = atoi(argv[1]);
		if (val < 0) {
			printf("%s: bad debugging value.\n", argv[1]);
			return;
		}
	} else
		val = !debug;
	debug = val;
	if (debug)
		options |= SO_DEBUG;
	else
		options &= ~SO_DEBUG;
	printf("Debugging %s (debug=%d).\n", onoff(debug), debug);
}

/*
 * Set current working directory
 * on remote machine.
 */
cd(argc, argv)
	char *argv[];
{

	if (argc < 2) {
		strcat(line, " ");
		printf("(remote-directory) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s remote-directory\n", argv[0]);
		return;
	}
	(void) command("CWD %s", argv[1]);
}

/*
 * Set current working directory
 * on local machine.
 */
lcd(argc, argv)
	char *argv[];
{
	char buf[MAXPATHLEN];

	if (argc < 2)
		argc++, argv[1] = home;
	if (argc != 2) {
		printf("%s local-directory\n", argv[0]);
		return;
	}
	if (!globulize(&argv[1]))
		return;
	if (chdir(argv[1]) < 0) {
		perror(argv[1]);
		return;
	}
	printf("Local directory now %s\n", getwd(buf));
}

/*
 * Delete a single file.
 */
delete(argc, argv)
	char *argv[];
{

	if (argc < 2) {
		strcat(line, " ");
		printf("(remote-file) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s remote-file\n", argv[0]);
		return;
	}
	(void) command("DELE %s", argv[1]);
}

/*
 * Delete multiple files.
 */
mdelete(argc, argv)
	char *argv[];
{
	char *cp;

	if (argc < 2) {
		strcat(line, " ");
		printf("(remote-files) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s remote-files\n", argv[0]);
		return;
	}
	while ((cp = remglob(argc, argv)) != NULL)
		if (confirm(argv[0], cp))
			(void) command("DELE %s", cp);
}

/*
 * Rename a remote file.
 */
renamefile(argc, argv)
	char *argv[];
{

	if (argc < 2) {
		strcat(line, " ");
		printf("(from-name) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
usage:
		printf("%s from-name to-name\n", argv[0]);
		return;
	}
	if (argc < 3) {
		strcat(line, " ");
		printf("(to-name) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 3) 
		goto usage;
	if (command("RNFR %s", argv[1]) == CONTINUE)
		(void) command("RNTO %s", argv[2]);
}

/*
 * Get a directory listing
 * of remote files.
 */
ls(argc, argv)
	char *argv[];
{
	char *cmd;

	if (argc < 2)
		argc++, argv[1] = NULL;
	if (argc < 3)
		argc++, argv[2] = "-";
	if (argc > 3) {
		printf("usage: %s remote-directory local-file\n", argv[0]);
		return;
	}
	cmd = argv[0][0] == 'l' ? "NLST" : "LIST";
	if (strcmp(argv[2], "-") && !globulize(&argv[2]))
		return;
	recvrequest(cmd, argv[2], argv[1], "w");
}

/*
 * Get a directory listing
 * of multiple remote files.
 */
mls(argc, argv)
	char *argv[];
{
	char *cmd, *mode, *cp, *dest;

	if (argc < 2) {
		strcat(line, " ");
		printf("(remote-files) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 3) {
		strcat(line, " ");
		printf("(local-file) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 3) {
		printf("%s remote-files local-file\n", argv[0]);
		return;
	}
	dest = argv[argc - 1];
	argv[argc - 1] = NULL;
	if (strcmp(dest, "-"))
		if (!globulize(&dest) || !confirm("local-file", dest))
			return;
	cmd = argv[0][1] == 'l' ? "NLST" : "LIST";
	for (mode = "w"; cp = remglob(argc, argv); mode = "a")
		if (confirm(argv[0], cp))
			recvrequest(cmd, dest, cp, mode);
}

/*
 * Do a shell escape
 */
shell(argc, argv)
	char *argv[];
{
	int pid, status, (*old1)(), (*old2)();
	char shellnam[40], *shell, *namep;
	char **cpp, **gargs;

	old1 = signal (SIGINT, SIG_IGN);
	old2 = signal (SIGQUIT, SIG_IGN);
	if ((pid = fork()) == 0) {
		for (pid = 3; pid < 20; pid++)
			close(pid);
		signal(SIGINT, SIG_DFL);
		signal(SIGQUIT, SIG_DFL);
		if (argc <= 1) {
			shell = getenv("SHELL");
			if (shell == NULL)
				shell = "/bin/sh";
			namep = rindex(shell,'/');
			if (namep == NULL)
				namep = shell;
			strcpy(shellnam,"-");
			strcat(shellnam, ++namep);
			if (strcmp(namep, "sh") != 0)
				shellnam[0] = '+';
			if (debug) {
				printf ("%s\n", shell);
				fflush (stdout);
			}
			execl(shell, shellnam, 0);
			perror(shell);
			exit(1);
		}
		cpp = &argv[1];
		if (argc > 2) {
			if ((gargs = glob(cpp)) != NULL)
				cpp = gargs;
			if (globerr != NULL) {
				printf("%s\n", globerr);
				exit(1);
			}
		}
		if (debug) {
			register char **zip = cpp;

			printf("%s", *zip);
			while (*++zip != NULL)
				printf(" %s", *zip);
			printf("\n");
			fflush(stdout);
		}
		execvp(argv[1], cpp);
		perror(argv[1]);
		exit(1);
	}
	if (pid > 0)
		while (wait(&status) != pid)
			;
	signal(SIGINT, old1);
	signal(SIGQUIT, old2);
	if (pid == -1)
		perror("Try again later");
	return (0);
}

/*
 * Send new user information (re-login)
 */
user(argc, argv)
	int argc;
	char **argv;
{
	char acct[80], *getpass();
	int n;

	if (argc < 2) {
		strcat(line, " ");
		printf("(username) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc > 4) {
		printf("usage: %s username [password] [account]\n", argv[0]);
		return (0);
	}
	n = command("USER %s", argv[1]);
	if (n == CONTINUE) {
		if (argc < 3 )
			argv[2] = getpass("Password: "), argc++;
		n = command("PASS %s", argv[2]);
	}
	if (n == CONTINUE) {
		if (argc < 4) {
			printf("Account: "); (void) fflush(stdout);
			(void) fgets(acct, sizeof(acct) - 1, stdin);
			acct[strlen(acct) - 1] = '\0';
			argv[3] = acct; argc++;
		}
		n = command("ACCT %s", acct);
	}
	if (n != COMPLETE) {
		fprintf(stderr, "Login failed.\n");
		return (0);
	}
	return (1);
}

/*
 * Print working directory.
 */
/*VARARGS*/
pwd()
{

	(void) command("XPWD");
}

/*
 * Make a directory.
 */
makedir(argc, argv)
	char *argv[];
{

	if (argc < 2) {
		strcat(line, " ");
		printf("(directory-name) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s directory-name\n", argv[0]);
		return;
	}
	(void) command("XMKD %s", argv[1]);
}

/*
 * Remove a directory.
 */
removedir(argc, argv)
	char *argv[];
{

	if (argc < 2) {
		strcat(line, " ");
		printf("(directory-name) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("%s directory-name\n", argv[0]);
		return;
	}
	(void) command("XRMD %s", argv[1]);
}

/*
 * Send a line, verbatim, to the remote machine.
 */
quote(argc, argv)
	char *argv[];
{
	int i;
	char buf[BUFSIZ];

	if (argc < 2) {
		strcat(line, " ");
		printf("(command line to send) ");
		gets(&line[strlen(line)]);
		makeargv();
		argc = margc;
		argv = margv;
	}
	if (argc < 2) {
		printf("usage: %s line-to-send\n", argv[0]);
		return;
	}
	strcpy(buf, argv[1]);
	for (i = 2; i < argc; i++) {
		strcat(buf, " ");
		strcat(buf, argv[i]);
	}
	(void) command(buf);
}

/*
 * Ask the other side for help.
 */
rmthelp(argc, argv)
	char *argv[];
{
	int oldverbose = verbose;

	verbose = 1;
	(void) command(argc == 1 ? "HELP" : "HELP %s", argv[1]);
	verbose = oldverbose;
}

/*
 * Terminate session and exit.
 */
/*VARARGS*/
quit()
{

	if (connected)
		disconnect();
	exit(0);
}

/*
 * Terminate session, but don't exit.
 */
disconnect()
{
	extern FILE *cout;
	extern int data;

	if (!connected)
		return;
	(void) command("QUIT");
	(void) fclose(cout);
	cout = NULL;
	connected = 0;
	data = -1;
}

confirm(cmd, file)
	char *cmd, *file;
{
	char line[BUFSIZ];

	if (!interactive)
		return (1);
	printf("%s %s? ", cmd, file);
	fflush(stdout);
	gets(line);
	return (*line != 'n' && *line != 'N');
}

fatal(msg)
	char *msg;
{

	fprintf(stderr, "ftp: %s\n");
	exit(1);
}

/*
 * Glob a local file name specification with
 * the expectation of a single return value.
 * Can't control multiple values being expanded
 * from the expression, we return only the first.
 */
globulize(cpp)
	char **cpp;
{
	char **globbed;

	if (!doglob)
		return (1);
	globbed = glob(*cpp);
	if (globerr != NULL) {
		printf("%s: %s\n", *cpp, globerr);
		if (globbed)
			blkfree(globbed);
		return (0);
	}
	if (globbed) {
		*cpp = *globbed++;
		/* don't waste too much memory */
		if (*globbed)
			blkfree(globbed);
	}
	return (1);
}