1066 lines
22 KiB
C
1066 lines
22 KiB
C
/*
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* Copyright (c) 1985, 1988 Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*/
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#ifndef lint
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char copyright[] =
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"@(#) Copyright (c) 1985, 1988 Regents of the University of California.\n\
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All rights reserved.\n";
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#endif not lint
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#ifndef lint
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static char sccsid[] = "@(#)ftpd.c 1.1 94/10/31 SMI"; /* from UCB 5.20 12/7/88 */
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#endif not lint
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/*
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* FTP server.
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*/
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/file.h>
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#include <sys/wait.h>
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#include <netinet/in.h>
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#include <arpa/ftp.h>
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#include <arpa/inet.h>
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#include <arpa/telnet.h>
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#include <stdio.h>
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#include <signal.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <netdb.h>
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#include <errno.h>
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#include <strings.h>
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#include <syslog.h>
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#include <varargs.h>
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/*
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* File containing login names
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* NOT to be used on this machine.
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* Commonly used to disallow uucp.
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*/
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#define FTPUSERS "/etc/ftpusers"
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extern int errno;
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extern char *sys_errlist[];
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extern int sys_nerr;
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extern char *crypt();
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extern char version[];
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extern char *home; /* pointer to home directory for glob */
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extern FILE *ftpd_popen(), *fopen(), *freopen();
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extern int ftpd_pclose(), fclose();
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extern char *getline();
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extern char cbuf[];
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struct sockaddr_in ctrl_addr;
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struct sockaddr_in data_source;
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struct sockaddr_in data_dest;
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struct sockaddr_in his_addr;
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int data;
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jmp_buf errcatch, urgcatch;
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int logged_in;
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struct passwd *pw;
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int debug;
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int timeout = 900; /* timeout after 15 minutes of inactivity */
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int logging;
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int guest;
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int type;
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int form;
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int stru; /* avoid C keyword */
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int mode;
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int usedefault = 1; /* for data transfers */
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int pdata = -1; /* for passive mode */
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int transflag;
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int socksize = 24 * 1024; /* larger socket window size for data */
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char tmpline[7];
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char hostname[MAXHOSTNAMELEN];
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char remotehost[MAXHOSTNAMELEN];
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char buf[BUFSIZ*8]; /* larger buffer to speed up binary xfers */
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/*
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* Timeout intervals for retrying connections
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* to hosts that don't accept PORT cmds. This
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* is a kludge, but given the problems with TCP...
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*/
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#define SWAITMAX 90 /* wait at most 90 seconds */
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#define SWAITINT 5 /* interval between retries */
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int swaitmax = SWAITMAX;
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int swaitint = SWAITINT;
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int lostconn();
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int myoob();
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FILE *getdatasock(), *dataconn();
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main(argc, argv)
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int argc;
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char *argv[];
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{
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int addrlen, on = 1;
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char *cp;
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openlog("ftpd", LOG_PID, LOG_DAEMON);
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addrlen = sizeof (his_addr);
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if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
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syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
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exit(1);
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}
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addrlen = sizeof (ctrl_addr);
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if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
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syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
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exit(1);
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}
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data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
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debug = 0;
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argc--, argv++;
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while (argc > 0 && *argv[0] == '-') {
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for (cp = &argv[0][1]; *cp; cp++) switch (*cp) {
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case 'v':
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debug = 1;
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break;
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case 'd':
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debug = 1;
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break;
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case 'l':
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logging = 1;
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break;
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case 't':
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timeout = atoi(++cp);
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goto nextopt;
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break;
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default:
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fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n",
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*cp);
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break;
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}
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nextopt:
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argc--, argv++;
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}
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(void) freopen("/dev/null", "w", stderr);
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(void) signal(SIGPIPE, lostconn);
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(void) signal(SIGCHLD, SIG_IGN);
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if (signal(SIGURG, myoob) == BADSIG)
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syslog(LOG_ERR, "signal: %m");
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/* handle urgent data inline */
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#ifdef SO_OOBINLINE
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if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0)
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syslog(LOG_ERR, "setsockopt: %m");
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#endif
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if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
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syslog(LOG_ERR, "fcntl F_SETOWN: %m");
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dolog(&his_addr);
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/* do telnet option negotiation here */
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/*
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* Set up default state
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*/
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data = -1;
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type = TYPE_A;
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form = FORM_N;
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stru = STRU_F;
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mode = MODE_S;
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tmpline[0] = '\0';
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(void) gethostname(hostname, sizeof (hostname));
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reply(220, "%s FTP server (%s) ready.", hostname, version);
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(void) setjmp(errcatch);
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for (;;)
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(void) yyparse();
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}
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lostconn()
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{
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if (debug)
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syslog(LOG_DEBUG, "lost connection");
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dologout(-1);
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}
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static char ttyline[20];
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/*
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* Helper function for sgetpwnam().
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*/
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char *
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sgetsave(s)
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char *s;
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{
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char *malloc();
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char *new = malloc((unsigned) strlen(s) + 1);
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if (new == NULL) {
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reply(553, "Local resource failure: malloc");
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dologout(1);
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}
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(void) strcpy(new, s);
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return (new);
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}
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/*
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* Save the result of a getpwnam. Used for USER command, since
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* the data returned must not be clobbered by any other command
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* (e.g., globbing).
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*/
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struct passwd *
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sgetpwnam(name)
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char *name;
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{
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static struct passwd save;
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register struct passwd *p;
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char *sgetsave();
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if ((p = getpwnam(name)) == NULL)
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return (p);
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if (save.pw_name) {
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free(save.pw_name);
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free(save.pw_passwd);
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free(save.pw_comment);
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free(save.pw_gecos);
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free(save.pw_dir);
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free(save.pw_shell);
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}
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save = *p;
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save.pw_name = sgetsave(p->pw_name);
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save.pw_passwd = sgetsave(p->pw_passwd);
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save.pw_comment = sgetsave(p->pw_comment);
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save.pw_gecos = sgetsave(p->pw_gecos);
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save.pw_dir = sgetsave(p->pw_dir);
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save.pw_shell = sgetsave(p->pw_shell);
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return (&save);
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}
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int login_attempts; /* number of failed login attempts */
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int askpasswd; /* had user command, ask for passwd */
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/*
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* USER command.
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* Sets global passwd pointer pw if named account exists
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* and is acceptable; sets askpasswd if a PASS command is
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* expected. If logged in previously, need to reset state.
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* If name is "ftp" or "anonymous" and ftp account exists,
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* set guest and pw, then just return.
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* If account doesn't exist, ask for passwd anyway.
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* Otherwise, check user requesting login privileges.
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* Disallow anyone who does not have a standard
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* shell returned by getusershell() (/etc/shells).
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* Disallow anyone mentioned in the file FTPUSERS
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* to allow people such as root and uucp to be avoided.
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*/
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user(name)
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char *name;
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{
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register char *cp;
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FILE *fd;
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char *shell;
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char line[BUFSIZ], *index(), *getusershell();
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if (logged_in) {
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if (guest) {
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reply(530, "Can't change user from guest login.");
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return;
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}
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end_login();
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}
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guest = 0;
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if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
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if ((pw = sgetpwnam("ftp")) != NULL) {
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guest = 1;
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askpasswd = 1;
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reply(331, "Guest login ok, send ident as password.");
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} else
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reply(530, "User %s unknown.", name);
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return;
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}
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if (pw = sgetpwnam(name)) {
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if ((shell = pw->pw_shell) == NULL || *shell == 0)
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shell = "/bin/sh";
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while ((cp = getusershell()) != NULL)
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if (strcmp(cp, shell) == 0)
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break;
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endusershell();
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if (cp == NULL) {
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reply(530, "User %s access denied.", name);
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pw = (struct passwd *) NULL;
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return;
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}
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if ((fd = fopen(FTPUSERS, "r")) != NULL) {
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while (fgets(line, sizeof (line), fd) != NULL) {
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if ((cp = index(line, '\n')) != NULL)
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*cp = '\0';
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if (strcmp(line, name) == 0) {
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reply(530, "User %s access denied.", name);
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pw = (struct passwd *) NULL;
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return;
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}
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}
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}
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(void) fclose(fd);
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}
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reply(331, "Password required for %s.", name);
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askpasswd = 1;
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/*
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* Delay before reading passwd after first failed
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* attempt to slow down passwd-guessing programs.
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*/
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if (login_attempts)
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sleep((unsigned) login_attempts);
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}
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/*
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* Terminate login as previous user, if any, resetting state;
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* used when USER command is given or login fails.
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*/
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end_login()
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{
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(void) seteuid((uid_t)0);
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if (logged_in)
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logwtmp(ttyline, "", "");
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pw = NULL;
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logged_in = 0;
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guest = 0;
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}
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pass(passwd)
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char *passwd;
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{
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char *xpasswd, *salt;
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if (logged_in || askpasswd == 0) {
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reply(503, "Login with USER first.");
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return;
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}
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askpasswd = 0;
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if (!guest) { /* "ftp" is only account allowed no password */
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if (pw == NULL)
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salt = "xx";
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else
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salt = pw->pw_passwd;
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xpasswd = crypt(passwd, salt);
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/* The strcmp does not catch null passwords! */
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if (pw == NULL || *pw->pw_passwd == '\0' ||
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strcmp(xpasswd, pw->pw_passwd)) {
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reply(530, "Login incorrect.");
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pw = NULL;
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if (login_attempts++ >= 5) {
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syslog(LOG_ERR,
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"repeated login failures from %s",
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remotehost);
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exit(0);
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}
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return;
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}
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}
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login_attempts = 0; /* this time successful */
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(void) setegid((gid_t)pw->pw_gid);
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(void) initgroups(pw->pw_name, pw->pw_gid);
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if (chdir(pw->pw_dir)) {
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if (chdir("/")) {
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reply(550, "User %s: can't change directory to %s.",
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pw->pw_name, pw->pw_dir);
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goto bad;
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}
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}
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/* open wtmp before chroot */
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(void)sprintf(ttyline, "ftp%d", getpid());
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logwtmp(ttyline, pw->pw_name, remotehost);
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logged_in = 1;
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if (guest && chroot(pw->pw_dir) < 0) {
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reply(550, "Can't set guest privileges.");
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goto bad;
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}
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if (seteuid((uid_t)pw->pw_uid) < 0) {
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reply(550, "Can't set uid.");
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goto bad;
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}
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if (guest)
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reply(230, "Guest login ok, access restrictions apply.");
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else
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reply(230, "User %s logged in.", pw->pw_name);
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home = pw->pw_dir; /* home dir for globbing */
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return;
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bad:
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/* Forget all about it... */
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end_login();
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}
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/*
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* return a printable type string
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*/
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char *print_type(t)
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{
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switch (t)
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{
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case TYPE_A: return("ASCII ");
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case TYPE_L:
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case TYPE_I: return("Binary ");
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}
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return("");
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}
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retrieve(cmd, name)
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char *cmd, *name;
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{
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FILE *fin, *dout;
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struct stat st;
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int (*closefunc)(), tmp;
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void (*oldpipe)(); /* Hold value of SIGPIPE during close */
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if (cmd == 0) {
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fin = fopen(name, "r"), closefunc = fclose;
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} else {
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char line[BUFSIZ];
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(void) sprintf(line, cmd, name), name = line;
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fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
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}
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if (fin == NULL) {
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if (errno != 0)
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perror_reply(550, name);
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return;
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}
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st.st_size = 0;
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if (cmd == 0 &&
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(stat(name, &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) {
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reply(550, "%s: not a plain file.", name);
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goto done;
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}
|
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dout = dataconn(name, st.st_size, "w");
|
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if (dout == NULL)
|
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goto done;
|
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if ((tmp = send_data(fin, dout)) > 0 || ferror(dout) > 0) {
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perror_reply(550, name);
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}
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else if (tmp == 0) {
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reply(226, "%sTransfer complete.", print_type(type));
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}
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/*
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* If the transfer failed because the data connection got aborted,
|
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* then the fclose may cause a SIGPIPE trying to flush the buffers
|
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* and abort the whole session. Ignore SIGPIPEs during the fclose.
|
|
*/
|
|
oldpipe = signal(SIGPIPE, SIG_IGN);
|
|
(void) fclose(dout);
|
|
data = -1;
|
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pdata = -1;
|
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signal(SIGPIPE, oldpipe);
|
|
done:
|
|
(*closefunc)(fin);
|
|
}
|
|
|
|
store(name, mode, unique)
|
|
char *name, *mode;
|
|
int unique;
|
|
{
|
|
FILE *fout, *din;
|
|
int (*closefunc)(), tmp;
|
|
char *gunique();
|
|
|
|
{
|
|
struct stat st;
|
|
|
|
if (unique && stat(name, &st) == 0 &&
|
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(name = gunique(name)) == NULL)
|
|
return;
|
|
fout = fopen(name, mode), closefunc = fclose;
|
|
}
|
|
if (fout == NULL) {
|
|
perror_reply(553, name);
|
|
return;
|
|
}
|
|
din = dataconn(name, (off_t)-1, "r");
|
|
if (din == NULL)
|
|
goto done;
|
|
if ((tmp = receive_data(din, fout)) > 0 || ferror(fout) > 0)
|
|
perror_reply(552, name);
|
|
else if (tmp == 0) {
|
|
if (ferror(fout) > 0)
|
|
perror_reply(552, name);
|
|
else if (unique)
|
|
reply(226, "Transfer complete (unique file name:%s).",
|
|
name);
|
|
else
|
|
reply(226, "%sTransfer complete.", print_type(type));
|
|
}
|
|
(void) fclose(din);
|
|
data = -1;
|
|
pdata = -1;
|
|
done:
|
|
(*closefunc)(fout);
|
|
}
|
|
|
|
FILE *
|
|
getdatasock(mode)
|
|
char *mode;
|
|
{
|
|
int s, on = 1;
|
|
|
|
if (data >= 0)
|
|
return (fdopen(data, mode));
|
|
s = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (s < 0)
|
|
return (NULL);
|
|
(void) seteuid((uid_t)0);
|
|
if (setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *) &on, sizeof (on)) < 0)
|
|
goto bad;
|
|
/* anchor socket to avoid multi-homing problems */
|
|
data_source.sin_family = AF_INET;
|
|
data_source.sin_addr = ctrl_addr.sin_addr;
|
|
if (bind(s, (struct sockaddr *)&data_source, sizeof (data_source)) < 0)
|
|
goto bad;
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
return (fdopen(s, mode));
|
|
bad:
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
(void) close(s);
|
|
return (NULL);
|
|
}
|
|
|
|
FILE *
|
|
dataconn(name, size, mode)
|
|
char *name;
|
|
off_t size;
|
|
char *mode;
|
|
{
|
|
char sizebuf[32];
|
|
FILE *file;
|
|
int retry = 0;
|
|
|
|
if (size != (off_t) -1)
|
|
(void) sprintf (sizebuf, " (%ld bytes)", size);
|
|
else
|
|
(void) strcpy(sizebuf, "");
|
|
if (pdata >= 0) {
|
|
struct sockaddr_in from;
|
|
int s, fromlen = sizeof(from);
|
|
|
|
s = accept(pdata, (struct sockaddr *)&from, &fromlen);
|
|
if (s < 0) {
|
|
reply(425, "Can't open data connection.");
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
return(NULL);
|
|
}
|
|
(void) close(pdata);
|
|
pdata = s;
|
|
reply(150, "%sdata connection for %s (%s,%d)%s.",
|
|
print_type(type),
|
|
name, inet_ntoa(from.sin_addr),
|
|
ntohs(from.sin_port), sizebuf);
|
|
return(fdopen(pdata, mode));
|
|
}
|
|
if (data >= 0) {
|
|
reply(125, "Using existing %sdata connection for %s%s.",
|
|
print_type(type),
|
|
name, sizebuf);
|
|
usedefault = 1;
|
|
return (fdopen(data, mode));
|
|
}
|
|
if (usedefault)
|
|
data_dest = his_addr;
|
|
usedefault = 1;
|
|
file = getdatasock(mode);
|
|
if (file == NULL) {
|
|
reply(425, "Can't create data socket (%s,%d): %s.",
|
|
inet_ntoa(data_source.sin_addr),
|
|
ntohs(data_source.sin_port),
|
|
errno < sys_nerr ? sys_errlist[errno] : "unknown error");
|
|
return (NULL);
|
|
}
|
|
data = fileno(file);
|
|
(void) setsockopt(data, SOL_SOCKET, SO_SNDBUF, (char *)&socksize,
|
|
sizeof (socksize));
|
|
(void) setsockopt(data, SOL_SOCKET, SO_RCVBUF, (char *)&socksize,
|
|
sizeof (socksize));
|
|
while (connect(data, &data_dest, sizeof (data_dest)) < 0) {
|
|
if (errno == EADDRINUSE && retry < swaitmax) {
|
|
sleep((unsigned) swaitint);
|
|
retry += swaitint;
|
|
continue;
|
|
}
|
|
perror_reply(425, "Can't build data connection");
|
|
(void) fclose(file);
|
|
data = -1;
|
|
return (NULL);
|
|
}
|
|
reply(150, "%sdata connection for %s (%s,%d)%s.",
|
|
print_type(type),
|
|
name, inet_ntoa(data_dest.sin_addr),
|
|
ntohs(data_dest.sin_port), sizebuf);
|
|
return (file);
|
|
}
|
|
|
|
/*
|
|
* Envelope for 'send_data_body'. Allow data connections to fail without
|
|
* terminating the daemon, but SIGPIPE is set to be ignored so that if
|
|
* one occurs on the data channel we'll just catch the error return on
|
|
* the write rather than causing the whole session to abort.
|
|
*/
|
|
|
|
send_data(instr, outstr)
|
|
FILE *instr; /* Data being sent */
|
|
FILE *outstr; /* Connection being transmitted upon */
|
|
{
|
|
int value; /* Return value from send_data_body */
|
|
void (*oldpipe)(); /* Old handler for SIGPIPE */
|
|
|
|
oldpipe = signal(SIGPIPE, SIG_IGN);
|
|
value = send_data_body(instr, outstr);
|
|
signal(SIGPIPE, oldpipe);
|
|
return (value);
|
|
}
|
|
|
|
/*
|
|
* Tranfer the contents of "instr" to
|
|
* "outstr" peer using the appropriate
|
|
* encapulation of the date subject
|
|
* to Mode, Structure, and Type.
|
|
*
|
|
* NB: Form isn't handled.
|
|
*/
|
|
send_data_body(instr, outstr)
|
|
FILE *instr, *outstr;
|
|
{
|
|
register int c;
|
|
int netfd, filefd, cnt;
|
|
|
|
transflag++;
|
|
if (setjmp(urgcatch)) {
|
|
transflag = 0;
|
|
return(-1);
|
|
}
|
|
switch (type) {
|
|
|
|
case TYPE_A:
|
|
while ((c = getc(instr)) != EOF) {
|
|
if (c == '\n') {
|
|
if (ferror (outstr)) {
|
|
transflag = 0;
|
|
return (1);
|
|
}
|
|
(void) putc('\r', outstr);
|
|
}
|
|
(void) putc(c, outstr);
|
|
}
|
|
transflag = 0;
|
|
if (ferror (instr) || ferror (outstr)) {
|
|
return (1);
|
|
}
|
|
return (0);
|
|
|
|
case TYPE_I:
|
|
case TYPE_L:
|
|
netfd = fileno(outstr);
|
|
filefd = fileno(instr);
|
|
|
|
while ((cnt = read(filefd, buf, sizeof (buf))) > 0) {
|
|
if (write(netfd, buf, cnt) < 0) {
|
|
transflag = 0;
|
|
return (1);
|
|
}
|
|
}
|
|
transflag = 0;
|
|
return (cnt < 0);
|
|
}
|
|
reply(550, "Unimplemented TYPE %d in send_data", type);
|
|
transflag = 0;
|
|
return (-1);
|
|
}
|
|
|
|
/*
|
|
* Transfer data from peer to
|
|
* "outstr" using the appropriate
|
|
* encapulation of the data subject
|
|
* to Mode, Structure, and Type.
|
|
*
|
|
* N.B.: Form isn't handled.
|
|
*/
|
|
receive_data(instr, outstr)
|
|
FILE *instr, *outstr;
|
|
{
|
|
register int c;
|
|
int cnt;
|
|
|
|
|
|
transflag++;
|
|
if (setjmp(urgcatch)) {
|
|
transflag = 0;
|
|
return(-1);
|
|
}
|
|
switch (type) {
|
|
|
|
case TYPE_I:
|
|
case TYPE_L:
|
|
while ((cnt = read(fileno(instr), buf, sizeof buf)) > 0) {
|
|
if (write(fileno(outstr), buf, cnt) < 0) {
|
|
transflag = 0;
|
|
return (1);
|
|
}
|
|
}
|
|
transflag = 0;
|
|
return (cnt < 0);
|
|
|
|
case TYPE_E:
|
|
reply(553, "TYPE E not implemented.");
|
|
transflag = 0;
|
|
return (-1);
|
|
|
|
case TYPE_A:
|
|
while ((c = getc(instr)) != EOF) {
|
|
while (c == '\r') {
|
|
if (ferror (outstr)) {
|
|
transflag = 0;
|
|
return (1);
|
|
}
|
|
if ((c = getc(instr)) != '\n')
|
|
(void) putc ('\r', outstr);
|
|
}
|
|
(void) putc (c, outstr);
|
|
}
|
|
transflag = 0;
|
|
if (ferror (instr) || ferror (outstr))
|
|
return (1);
|
|
return (0);
|
|
}
|
|
transflag = 0;
|
|
fatal("Unknown type in receive_data.");
|
|
/*NOTREACHED*/
|
|
}
|
|
|
|
fatal(s)
|
|
char *s;
|
|
{
|
|
reply(451, "Error in server: %s\n", s);
|
|
reply(221, "Closing connection due to server error.");
|
|
dologout(0);
|
|
}
|
|
|
|
/*VARARGS2*/
|
|
reply(n, s, va_alist)
|
|
int n;
|
|
char *s;
|
|
va_dcl
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap);
|
|
printf("%d ", n);
|
|
_doprnt(s, ap, stdout);
|
|
printf("\r\n");
|
|
(void) fflush(stdout);
|
|
if (debug) {
|
|
syslog(LOG_DEBUG, "<--- %d ", n);
|
|
vsyslog(LOG_DEBUG, s, ap);
|
|
}
|
|
va_end(ap);
|
|
}
|
|
|
|
/*VARARGS2*/
|
|
lreply(n, s, va_alist)
|
|
int n;
|
|
char *s;
|
|
va_dcl
|
|
{
|
|
va_list ap;
|
|
|
|
va_start(ap);
|
|
printf("%d-", n);
|
|
_doprnt(s, ap, stdout);
|
|
printf("\r\n");
|
|
(void) fflush(stdout);
|
|
if (debug) {
|
|
syslog(LOG_DEBUG, "<--- %d- ", n);
|
|
vsyslog(LOG_DEBUG, s, ap);
|
|
}
|
|
va_end(ap);
|
|
}
|
|
|
|
ack(s)
|
|
char *s;
|
|
{
|
|
reply(250, "%s command successful.", s);
|
|
}
|
|
|
|
nack(s)
|
|
char *s;
|
|
{
|
|
reply(502, "%s command not implemented.", s);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
yyerror(s)
|
|
char *s;
|
|
{
|
|
char *cp;
|
|
|
|
cp = index(cbuf,'\n');
|
|
*cp = '\0';
|
|
reply(500, "'%s': command not understood.",cbuf);
|
|
}
|
|
|
|
delete(name)
|
|
char *name;
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(name, &st) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
if ((st.st_mode&S_IFMT) == S_IFDIR) {
|
|
if (rmdir(name) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
goto done;
|
|
}
|
|
if (unlink(name) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
done:
|
|
ack("DELE");
|
|
}
|
|
|
|
cwd(path)
|
|
char *path;
|
|
{
|
|
|
|
if (chdir(path) < 0) {
|
|
perror_reply(550, path);
|
|
return;
|
|
}
|
|
ack("CWD");
|
|
}
|
|
|
|
makedir(name)
|
|
char *name;
|
|
{
|
|
if (mkdir(name, 0777) < 0)
|
|
perror_reply(550, name);
|
|
else
|
|
reply(257, "MKD command successful.");
|
|
}
|
|
|
|
removedir(name)
|
|
char *name;
|
|
{
|
|
|
|
if (rmdir(name) < 0) {
|
|
perror_reply(550, name);
|
|
return;
|
|
}
|
|
ack("RMD");
|
|
}
|
|
|
|
pwd()
|
|
{
|
|
char path[MAXPATHLEN + 1];
|
|
extern char *getwd();
|
|
|
|
if (getwd(path) == (char *)NULL) {
|
|
reply(550, "%s.", path);
|
|
return;
|
|
}
|
|
reply(257, "\"%s\" is current directory.", path);
|
|
}
|
|
|
|
char *
|
|
renamefrom(name)
|
|
char *name;
|
|
{
|
|
struct stat st;
|
|
|
|
if (stat(name, &st) < 0) {
|
|
perror_reply(550, name);
|
|
return ((char *)0);
|
|
}
|
|
reply(350, "File exists, ready for destination name");
|
|
return (name);
|
|
}
|
|
|
|
renamecmd(from, to)
|
|
char *from, *to;
|
|
{
|
|
|
|
if (rename(from, to) < 0) {
|
|
perror_reply(550, "rename");
|
|
return;
|
|
}
|
|
ack("RNTO");
|
|
}
|
|
|
|
dolog(sin)
|
|
struct sockaddr_in *sin;
|
|
{
|
|
struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
|
|
sizeof (struct in_addr), AF_INET);
|
|
time_t t, time();
|
|
extern char *ctime();
|
|
|
|
if (hp)
|
|
(void) strncpy(remotehost, hp->h_name, sizeof (remotehost));
|
|
else
|
|
(void) strncpy(remotehost, inet_ntoa(sin->sin_addr),
|
|
sizeof (remotehost));
|
|
if (!logging)
|
|
return;
|
|
t = time((time_t *) 0);
|
|
syslog(LOG_INFO, "connection from %s at %s",
|
|
remotehost, ctime(&t));
|
|
}
|
|
|
|
/*
|
|
* Record logout in wtmp file
|
|
* and exit with supplied status.
|
|
*/
|
|
dologout(status)
|
|
int status;
|
|
{
|
|
if (logged_in) {
|
|
(void) seteuid((uid_t)0);
|
|
logwtmp(ttyline, "", "");
|
|
}
|
|
/* beware of flushing buffers after a SIGPIPE */
|
|
_exit(status);
|
|
}
|
|
|
|
myoob()
|
|
{
|
|
char *cp;
|
|
|
|
/* only process if transfer occurring */
|
|
if (!transflag)
|
|
return;
|
|
cp = tmpline;
|
|
if (getline(cp, 7, stdin) == NULL) {
|
|
reply(221, "You could at least say goodbye.");
|
|
dologout(0);
|
|
}
|
|
upper(cp);
|
|
if (strcmp(cp, "ABOR\r\n"))
|
|
return;
|
|
tmpline[0] = '\0';
|
|
reply(426,"Transfer aborted. Data connection closed.");
|
|
reply(226,"Abort successful");
|
|
longjmp(urgcatch, 1);
|
|
}
|
|
|
|
/*
|
|
* Note: The 530 reply codes could be 4xx codes, except nothing is
|
|
* given in the state tables except 421 which implies an exit. (RFC959)
|
|
*/
|
|
passive()
|
|
{
|
|
int len;
|
|
struct sockaddr_in tmp;
|
|
register char *p, *a;
|
|
|
|
pdata = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (pdata < 0) {
|
|
reply(530, "Can't open passive connection");
|
|
return;
|
|
}
|
|
tmp = ctrl_addr;
|
|
tmp.sin_port = 0;
|
|
(void) seteuid((uid_t)0);
|
|
if (bind(pdata, (struct sockaddr *) &tmp, sizeof(tmp)) < 0) {
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
reply(530, "Can't open passive connection");
|
|
return;
|
|
}
|
|
(void) seteuid((uid_t)pw->pw_uid);
|
|
len = sizeof(tmp);
|
|
if (getsockname(pdata, (struct sockaddr *) &tmp, &len) < 0) {
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
reply(530, "Can't open passive connection");
|
|
return;
|
|
}
|
|
if (listen(pdata, 1) < 0) {
|
|
(void) close(pdata);
|
|
pdata = -1;
|
|
reply(530, "Can't open passive connection");
|
|
return;
|
|
}
|
|
a = (char *) &tmp.sin_addr;
|
|
p = (char *) &tmp.sin_port;
|
|
|
|
#define UC(b) (((int) b) & 0xff)
|
|
|
|
reply(227, "Entering Passive Mode (%d,%d,%d,%d,%d,%d)", UC(a[0]),
|
|
UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
|
|
}
|
|
|
|
/*
|
|
* Generate unique name for file with basename "local".
|
|
* The file named "local" is already known to exist.
|
|
* Generates failure reply on error.
|
|
*/
|
|
char *
|
|
gunique(local)
|
|
char *local;
|
|
{
|
|
static char new[MAXPATHLEN];
|
|
struct stat st;
|
|
char *cp = rindex(local, '/');
|
|
int d, count=0;
|
|
|
|
if (cp)
|
|
*cp = '\0';
|
|
d = stat(cp ? local : ".", &st);
|
|
if (cp)
|
|
*cp = '/';
|
|
if (d < 0) {
|
|
perror_reply(553, local);
|
|
return((char *) 0);
|
|
}
|
|
(void) strcpy(new, local);
|
|
cp = new + strlen(new);
|
|
*cp++ = '.';
|
|
for (count = 1; count < 100; count++) {
|
|
(void) sprintf(cp, "%d", count);
|
|
if (stat(new, &st) < 0)
|
|
return(new);
|
|
}
|
|
reply(452, "Unique file name cannot be created.");
|
|
return((char *) 0);
|
|
}
|
|
|
|
/*
|
|
* Format and send reply containing system error number.
|
|
*/
|
|
perror_reply(code, string)
|
|
int code;
|
|
char *string;
|
|
{
|
|
|
|
if (errno < sys_nerr)
|
|
reply(code, "%s: %s.", string, sys_errlist[errno]);
|
|
else
|
|
reply(code, "%s: unknown error %d.", string, errno);
|
|
}
|