Cygnus implementation of GSSAPI-based ftp client and server.

See README.gssftp for history and details.
Bugs, comments to <eichin@cygnus.com>. Be sure to forward any changes
made at MIT as well.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@7312 dc483132-0cff-0310-8789-dd5450dbe970

1 files changed, 553 insertions, 0 deletions

diff --git a/src/appl/gssftp/ftp/main.c b/src/appl/gssftp/ftp/main.c
new file mode 100644
index 0000000..4a6d88f
--- /dev/null
+++ b/src/appl/gssftp/ftp/main.c
@@ -0,0 +1,553 @@
+/*
+ * Copyright (c) 1985, 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * 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
+char copyright[] =
+"@(#) Copyright (c) 1985, 1989 Regents of the University of California.\n\
+ All rights reserved.\n";
+#endif /* not lint */
+
+#ifndef lint
+static char sccsid[] = "@(#)main.c	5.18 (Berkeley) 3/1/91";
+#endif /* not lint */
+
+/*
+ * FTP User Program -- Command Interface.
+ */
+#include <stdio.h>
+#include "ftp_var.h"
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+#include <sys/types.h>
+
+#include <arpa/ftp.h>
+
+#include <signal.h>
+#include <string.h>
+#include <errno.h>
+#include <ctype.h>
+#include <netdb.h>
+#include <pwd.h>
+
+#define sig_t my_sig_t
+#define sigtype krb5_sigtype
+typedef sigtype (*sig_t)();
+
+uid_t	getuid();
+sigtype	intr(), lostpeer();
+extern	char *home;
+char	*getlogin();
+#ifdef KERBEROS
+#include <krb.h>
+struct servent staticsp;
+extern char realm[];
+#endif /* KERBEROS */
+
+main(argc, argv)
+	char *argv[];
+{
+	register char *cp;
+	int top;
+	struct passwd *pw = NULL;
+	char homedir[MAXPATHLEN];
+
+	sp = getservbyname("ftp", "tcp");
+	if (sp == 0) {
+		fprintf(stderr, "ftp: ftp/tcp: unknown service\n");
+		exit(1);
+	}
+#ifdef KERBEROS
+/* GDM need to static sp so that the information is not lost
+   when kerberos calls getservbyname */
+	memcpy(&staticsp,sp,sizeof(struct servent));
+	sp = &staticsp;
+#endif /* KERBEROS */
+	doglob = 1;
+	interactive = 1;
+	autologin = 1;
+	argc--, argv++;
+	while (argc > 0 && **argv == '-') {
+		for (cp = *argv + 1; *cp; cp++)
+			switch (*cp) {
+
+			case 'd':
+				options |= SO_DEBUG;
+				debug++;
+				break;
+
+#ifdef KERBEROS
+			case 'k':
+				if (*++cp != '\0')
+					strncpy(realm, ++cp, REALM_SZ);
+				else if (argc > 1) {
+					argc--, argv++;
+					strncpy(realm, *argv, REALM_SZ);
+				}
+				else
+					fprintf(stderr, "ftp: -k expects arguments\n");
+				goto nextopt;
+#endif
+
+			case 'v':
+				verbose++;
+				break;
+
+			case 't':
+				trace++;
+				break;
+
+			case 'i':
+				interactive = 0;
+				break;
+
+			case 'n':
+				autologin = 0;
+				break;
+
+			case 'g':
+				doglob = 0;
+				break;
+
+			default:
+				fprintf(stdout,
+				  "ftp: %c: unknown option\n", *cp);
+				exit(1);
+			}
+	nextopt:
+		argc--, argv++;
+	}
+	fromatty = isatty(fileno(stdin));
+	if (fromatty)
+		verbose++;
+	cpend = 0;	/* no pending replies */
+	proxy = 0;	/* proxy not active */
+#ifndef NO_PASSIVE_MODE
+	passivemode = 1; /* passive mode active */
+#endif
+	crflag = 1;	/* strip c.r. on ascii gets */
+	sendport = -1;	/* not using ports */
+	/*
+	 * Set up the home directory in case we're globbing.
+	 */
+	cp = getlogin();
+	if (cp != NULL) {
+		pw = getpwnam(cp);
+	}
+	if (pw == NULL)
+		pw = getpwuid(getuid());
+	if (pw != NULL) {
+		home = homedir;
+		(void) strcpy(home, pw->pw_dir);
+	}
+	if (argc > 0) {
+		if (setjmp(toplevel))
+			exit(0);
+		(void) signal(SIGINT, intr);
+		(void) signal(SIGPIPE, lostpeer);
+		setpeer(argc + 1, argv - 1);
+	}
+	top = setjmp(toplevel) == 0;
+	if (top) {
+		(void) signal(SIGINT, intr);
+		(void) signal(SIGPIPE, lostpeer);
+	}
+	for (;;) {
+		cmdscanner(top);
+		top = 1;
+	}
+}
+
+sigtype
+intr(sig)
+	int sig;
+{
+
+	longjmp(toplevel, 1);
+}
+
+sigtype
+lostpeer(sig)
+	int sig;
+{
+	extern FILE *cout;
+	extern int data;
+	extern char *auth_type;
+	extern int level;
+
+	if (connected) {
+		if (cout != NULL) {
+			(void) shutdown(fileno(cout), 1+1);
+			(void) fclose(cout);
+			cout = NULL;
+		}
+		if (data >= 0) {
+			(void) shutdown(data, 1+1);
+			(void) close(data);
+			data = -1;
+		}
+		connected = 0;
+		auth_type = NULL;
+		level = PROT_C;
+	}
+	pswitch(1);
+	if (connected) {
+		if (cout != NULL) {
+			(void) shutdown(fileno(cout), 1+1);
+			(void) fclose(cout);
+			cout = NULL;
+		}
+		connected = 0;
+		auth_type = NULL;
+		level = PROT_C;
+	}
+	proxflag = 0;
+	pswitch(0);
+}
+
+/*char *
+tail(filename)
+	char *filename;
+{
+	register char *s;
+	
+	while (*filename) {
+		s = strrchr(filename, '/');
+		if (s == NULL)
+			break;
+		if (s[1])
+			return (s + 1);
+		*s = '\0';
+	}
+	return (filename);
+}
+*/
+/*
+ * Command parser.
+ */
+cmdscanner(top)
+	int top;
+{
+	register struct cmd *c;
+	register int l;
+	struct cmd *getcmd();
+	extern int help();
+
+	if (!top)
+		(void) putchar('\n');
+	for (;;) {
+		if (fromatty) {
+			printf("ftp> ");
+			(void) fflush(stdout);
+		}
+		if (fgets(line, sizeof line, stdin) == NULL)
+			quit();
+		l = strlen(line);
+		if (l == 0)
+			break;
+		if (line[--l] == '\n') {
+			if (l == 0)
+				break;
+			line[l] = '\0';
+		} else if (l == sizeof(line) - 2) {
+			printf("sorry, input line too long\n");
+			while ((l = getchar()) != '\n' && l != EOF)
+				/* void */;
+			break;
+		} /* else it was a line without a newline */
+		makeargv();
+		if (margc == 0) {
+			continue;
+		}
+		c = getcmd(margv[0]);
+		if (c == (struct cmd *)-1) {
+			printf("?Ambiguous command\n");
+			continue;
+		}
+		if (c == 0) {
+			printf("?Invalid command\n");
+			continue;
+		}
+		if (c->c_conn && !connected) {
+			printf("Not connected.\n");
+			continue;
+		}
+		(*c->c_handler)(margc, margv);
+		if (bell && c->c_bell)
+			(void) putchar('\007');
+		if (c->c_handler != help)
+			break;
+	}
+	(void) signal(SIGINT, intr);
+	(void) signal(SIGPIPE, lostpeer);
+}
+
+struct cmd *
+getcmd(name)
+	register char *name;
+{
+	extern struct cmd cmdtab[];
+	register char *p, *q;
+	register struct cmd *c, *found;
+	register int nmatches, longest;
+
+	longest = 0;
+	nmatches = 0;
+	found = 0;
+	for (c = cmdtab; p = c->c_name; c++) {
+		for (q = name; *q == *p++; q++)
+			if (*q == 0)		/* exact match? */
+				return (c);
+		if (!*q) {			/* the name was a prefix */
+			if (q - name > longest) {
+				longest = q - name;
+				nmatches = 1;
+				found = c;
+			} else if (q - name == longest)
+				nmatches++;
+		}
+	}
+	if (nmatches > 1)
+		return ((struct cmd *)-1);
+	return (found);
+}
+
+/*
+ * Slice a string up into argc/argv.
+ */
+
+int slrflag;
+
+makeargv()
+{
+	char **argp;
+	char *slurpstring();
+
+	margc = 0;
+	argp = margv;
+	stringbase = line;		/* scan from first of buffer */
+	argbase = argbuf;		/* store from first of buffer */
+	slrflag = 0;
+	while (*argp++ = slurpstring())
+		margc++;
+}
+
+/*
+ * Parse string into argbuf;
+ * implemented with FSM to
+ * handle quoting and strings
+ */
+char *
+slurpstring()
+{
+	int got_one = 0;
+	register char *sb = stringbase;
+	register char *ap = argbase;
+	char *tmp = argbase;		/* will return this if token found */
+
+	if (*sb == '!' || *sb == '$') {	/* recognize ! as a token for shell */
+		switch (slrflag) {	/* and $ as token for macro invoke */
+			case 0:
+				slrflag++;
+				stringbase++;
+				return ((*sb == '!') ? "!" : "$");
+				/* NOTREACHED */
+			case 1:
+				slrflag++;
+				altarg = stringbase;
+				break;
+			default:
+				break;
+		}
+	}
+
+S0:
+	switch (*sb) {
+
+	case '\0':
+		goto OUT;
+
+	case ' ':
+	case '\t':
+		sb++; goto S0;
+
+	default:
+		switch (slrflag) {
+			case 0:
+				slrflag++;
+				break;
+			case 1:
+				slrflag++;
+				altarg = sb;
+				break;
+			default:
+				break;
+		}
+		goto S1;
+	}
+
+S1:
+	switch (*sb) {
+
+	case ' ':
+	case '\t':
+	case '\0':
+		goto OUT;	/* end of token */
+
+	case '\\':
+		sb++; goto S2;	/* slurp next character */
+
+	case '"':
+		sb++; goto S3;	/* slurp quoted string */
+
+	default:
+		*ap++ = *sb++;	/* add character to token */
+		got_one = 1;
+		goto S1;
+	}
+
+S2:
+	switch (*sb) {
+
+	case '\0':
+		goto OUT;
+
+	default:
+		*ap++ = *sb++;
+		got_one = 1;
+		goto S1;
+	}
+
+S3:
+	switch (*sb) {
+
+	case '\0':
+		goto OUT;
+
+	case '"':
+		sb++; goto S1;
+
+	default:
+		*ap++ = *sb++;
+		got_one = 1;
+		goto S3;
+	}
+
+OUT:
+	if (got_one)
+		*ap++ = '\0';
+	argbase = ap;			/* update storage pointer */
+	stringbase = sb;		/* update scan pointer */
+	if (got_one) {
+		return(tmp);
+	}
+	switch (slrflag) {
+		case 0:
+			slrflag++;
+			break;
+		case 1:
+			slrflag++;
+			altarg = (char *) 0;
+			break;
+		default:
+			break;
+	}
+	return((char *)0);
+}
+
+#define HELPINDENT (sizeof ("directory"))
+
+/*
+ * Help command.
+ * Call each command handler with argc == 0 and argv[0] == name.
+ */
+help(argc, argv)
+	int argc;
+	char *argv[];
+{
+	extern struct cmd cmdtab[];
+	register struct cmd *c;
+
+	if (argc == 1) {
+		register int i, j, w, k;
+		int columns, width = 0, lines;
+		extern int NCMDS;
+
+		printf("Commands may be abbreviated.  Commands are:\n\n");
+		for (c = cmdtab; c < &cmdtab[NCMDS]; c++) {
+			int len = strlen(c->c_name);
+
+			if (len > width)
+				width = len;
+		}
+		width = (width + 8) &~ 7;
+		columns = 80 / width;
+		if (columns == 0)
+			columns = 1;
+		lines = (NCMDS + columns - 1) / columns;
+		for (i = 0; i < lines; i++) {
+			for (j = 0; j < columns; j++) {
+				c = cmdtab + j * lines + i;
+				if (c->c_name && (!proxy || c->c_proxy)) {
+					printf("%s", c->c_name);
+				}
+				else if (c->c_name) {
+					for (k=0; k < strlen(c->c_name); k++) {
+						(void) putchar(' ');
+					}
+				}
+				if (c + lines >= &cmdtab[NCMDS]) {
+					printf("\n");
+					break;
+				}
+				w = strlen(c->c_name);
+				while (w < width) {
+					w = (w + 8) &~ 7;
+					(void) putchar('\t');
+				}
+			}
+		}
+		return;
+	}
+	while (--argc > 0) {
+		register char *arg;
+		arg = *++argv;
+		c = getcmd(arg);
+		if (c == (struct cmd *)-1)
+			printf("?Ambiguous help command %s\n", arg);
+		else if (c == (struct cmd *)0)
+			printf("?Invalid help command %s\n", arg);
+		else
+			printf("%-*s\t%s\n", HELPINDENT,
+				c->c_name, c->c_help);
+	}
+}