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- /*
- * Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994
- * The 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
- static char copyright[] =
- "@(#) Copyright (c) 1985, 1988, 1990, 1992, 1993, 1994\n\
- The Regents of the University of California. All rights reserved.\n";
- #endif /* not lint */
-
- #ifndef lint
- static char sccsid[] = "@(#)ftpd.c 8.5 (Berkeley) 4/28/95";
- #endif /* not lint */
-
- /*
- * FTP server.
- */
-
- #ifdef HAVE_CONFIG_H
- #include <config.h>
- #endif
-
- #include <sys/param.h>
- #include <sys/stat.h>
- #include <sys/ioctl.h>
- #include <sys/socket.h>
- #include <sys/wait.h>
-
- #include <netinet/in.h>
- #ifdef HAVE_NETINET_IN_SYSTM_H
- #include <netinet/in_systm.h>
- #endif
- #ifdef HAVE_NETINET_IP_H
- #include <netinet/ip.h>
- #endif
-
- #define FTP_NAMES
- #include <arpa/ftp.h>
- #include <arpa/inet.h>
- #include <arpa/telnet.h>
-
- #include <ctype.h>
- #include <dirent.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <glob.h>
- #include <limits.h>
- #include <netdb.h>
- #include <pwd.h>
- #include <setjmp.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <syslog.h>
- #include <time.h>
- #include <unistd.h>
- #include <paths.h>
- #include <crypt.h>
-
- #include "extern.h"
-
- #if __STDC__
- #include <stdarg.h>
- #else
- #include <varargs.h>
- #endif
-
- static char version[] = "Version 6.00";
-
- extern off_t restart_point;
- extern char cbuf[];
-
- struct sockaddr_in ctrl_addr;
- struct sockaddr_in data_source;
- struct sockaddr_in data_dest;
- struct sockaddr_in his_addr;
- struct sockaddr_in pasv_addr;
-
- int data;
- jmp_buf errcatch, urgcatch;
- int logged_in;
- struct passwd *pw;
- int debug;
- int timeout = 900; /* timeout after 15 minutes of inactivity */
- int maxtimeout = 7200;/* don't allow idle time to be set beyond 2 hours */
- int logging;
- int guest;
- int type;
- int form;
- int stru; /* avoid C keyword */
- int mode;
- int usedefault = 1; /* for data transfers */
- int pdata = -1; /* for passive mode */
- sig_atomic_t transflag;
- off_t file_size;
- off_t byte_count;
- #if !defined(CMASK) || CMASK == 0
- #undef CMASK
- #define CMASK 027
- #endif
- int defumask = CMASK; /* default umask value */
- char tmpline[7];
- char *hostname = 0;
- char *remotehost = 0;
-
- #define NUM_SIMUL_OFF_TO_STRS 4
-
- /* Returns a string with the decimal representation of the off_t OFF, taking
- into account that off_t might be longer than a long. The return value is
- a pointer to a static buffer, but a return value will only be reused every
- NUM_SIMUL_OFF_TO_STRS calls, to allow multiple off_t's to be conveniently
- printed with a single printf statement. */
- static char *
- off_to_str (off)
- off_t off;
- {
- static char bufs[NUM_SIMUL_OFF_TO_STRS][80];
- static char (*next_buf)[80] = bufs;
-
- if (next_buf > &bufs[NUM_SIMUL_OFF_TO_STRS])
- next_buf = bufs;
-
- if (sizeof (off) > sizeof (long))
- sprintf (*next_buf, "%qd", off);
- else if (sizeof (off) == sizeof (long))
- sprintf (*next_buf, "%ld", off);
- else
- sprintf (*next_buf, "%d", off);
-
- return *next_buf++;
- }
-
- /*
- * Timeout intervals for retrying connections
- * to hosts that don't accept PORT cmds. This
- * is a kludge, but given the problems with TCP...
- */
- #define SWAITMAX 90 /* wait at most 90 seconds */
- #define SWAITINT 5 /* interval between retries */
-
- int swaitmax = SWAITMAX;
- int swaitint = SWAITINT;
-
- #ifdef SETPROCTITLE
- char **Argv = NULL; /* pointer to argument vector */
- char *LastArgv = NULL; /* end of argv */
- char proctitle[LINE_MAX]; /* initial part of title */
- #endif /* SETPROCTITLE */
-
- #define LOGCMD(cmd, file) \
- if (logging > 1) \
- syslog(LOG_INFO,"%s %s%s", cmd, \
- *(file) == '/' ? "" : curdir(), file);
- #define LOGCMD2(cmd, file1, file2) \
- if (logging > 1) \
- syslog(LOG_INFO,"%s %s%s %s%s", cmd, \
- *(file1) == '/' ? "" : curdir(), file1, \
- *(file2) == '/' ? "" : curdir(), file2);
- #define LOGBYTES(cmd, file, cnt) \
- if (logging > 1) { \
- if (cnt == (off_t)-1) \
- syslog(LOG_INFO,"%s %s%s", cmd, \
- *(file) == '/' ? "" : curdir(), file); \
- else \
- syslog(LOG_INFO, "%s %s%s = %s bytes", \
- cmd, (*(file) == '/') ? "" : curdir(), file, \
- off_to_str (cnt)); \
- }
-
- static void ack __P((char *));
- static void myoob __P((int));
- static int checkuser __P((char *));
- static FILE *dataconn __P((char *, off_t, char *));
- static void dolog __P((struct sockaddr_in *));
- static char *curdir __P((void));
- static void end_login __P((void));
- static FILE *getdatasock __P((char *));
- static char *gunique __P((char *));
- static void lostconn __P((int));
- static int receive_data __P((FILE *, FILE *));
- static void send_data __P((FILE *, FILE *, off_t));
- static struct passwd *
- sgetpwnam __P((char *));
- static char *sgetsave __P((char *));
-
- static char *
- curdir()
- {
- static char *path = 0;
- if (path)
- free (path);
- path = getcwd (0, 0);
- if (! path)
- return ("");
- if (path[1] != '\0') { /* special case for root dir. */
- char *new = realloc (path, strlen (path) + 2); /* '/' + '\0' */
- if (! new)
- return "";
- strcat(new, "/");
- path = new;
- }
- /* For guest account, skip / since it's chrooted */
- return (guest ? path+1 : path);
- }
-
- int
- main(argc, argv, envp)
- int argc;
- char *argv[];
- char **envp;
- {
- extern char *localhost ();
- int addrlen, ch, on = 1, tos;
- char *cp, line[LINE_MAX];
- FILE *fd;
-
- /*
- * LOG_NDELAY sets up the logging connection immediately,
- * necessary for anonymous ftp's that chroot and can't do it later.
- */
- openlog("ftpd", LOG_PID | LOG_NDELAY, LOG_FTP);
- addrlen = sizeof(his_addr);
- if (getpeername(0, (struct sockaddr *)&his_addr, &addrlen) < 0) {
- syslog(LOG_ERR, "getpeername (%s): %m",argv[0]);
- exit(1);
- }
- addrlen = sizeof(ctrl_addr);
- if (getsockname(0, (struct sockaddr *)&ctrl_addr, &addrlen) < 0) {
- syslog(LOG_ERR, "getsockname (%s): %m",argv[0]);
- exit(1);
- }
- #if defined (IP_TOS) && defined (IPTOS_LOWDELAY) && defined (IPPROTO_IP)
- tos = IPTOS_LOWDELAY;
- if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
- syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
- #endif
- data_source.sin_port = htons(ntohs(ctrl_addr.sin_port) - 1);
- debug = 0;
- #ifdef SETPROCTITLE
- /*
- * Save start and extent of argv for setproctitle.
- */
- Argv = argv;
- while (*envp)
- envp++;
- LastArgv = envp[-1] + strlen(envp[-1]);
- #endif /* SETPROCTITLE */
-
- while ((ch = getopt(argc, argv, "dlt:T:u:v")) != EOF) {
- switch (ch) {
- case 'd':
- debug = 1;
- break;
-
- case 'l':
- logging++; /* > 1 == extra logging */
- break;
-
- case 't':
- timeout = atoi(optarg);
- if (maxtimeout < timeout)
- maxtimeout = timeout;
- break;
-
- case 'T':
- maxtimeout = atoi(optarg);
- if (timeout > maxtimeout)
- timeout = maxtimeout;
- break;
-
- case 'u':
- {
- long val = 0;
-
- val = strtol(optarg, &optarg, 8);
- if (*optarg != '\0' || val < 0)
- fprintf (stderr,
- "%s: bad value for -u", argv[0]);
- else
- defumask = val;
- break;
- }
-
- case 'v':
- debug = 1;
- break;
-
- default:
- fprintf (stderr,
- "%s: unknown flag -%c ignored", argv[0]);
- break;
- }
- }
- (void) freopen(_PATH_DEVNULL, "w", stderr);
- (void) signal(SIGPIPE, lostconn);
- (void) signal(SIGCHLD, SIG_IGN);
- if ((int)signal(SIGURG, myoob) < 0)
- syslog(LOG_ERR, "signal: %m");
-
- /* Try to handle urgent data inline */
- #ifdef SO_OOBINLINE
- if (setsockopt(0, SOL_SOCKET, SO_OOBINLINE, (char *)&on, sizeof(on)) < 0)
- syslog(LOG_ERR, "setsockopt: %m");
- #endif
-
- #ifdef F_SETOWN
- if (fcntl(fileno(stdin), F_SETOWN, getpid()) == -1)
- syslog(LOG_ERR, "fcntl F_SETOWN: %m");
- #endif
- dolog(&his_addr);
- /*
- * Set up default state
- */
- data = -1;
- type = TYPE_A;
- form = FORM_N;
- stru = STRU_F;
- mode = MODE_S;
- tmpline[0] = '\0';
-
- /* If logins are disabled, print out the message. */
- if ((fd = fopen(_PATH_NOLOGIN,"r")) != NULL) {
- while (fgets(line, sizeof(line), fd) != NULL) {
- if ((cp = strchr(line, '\n')) != NULL)
- *cp = '\0';
- lreply(530, "%s", line);
- }
- (void) fflush(stdout);
- (void) fclose(fd);
- reply(530, "System not available.");
- exit(0);
- }
- if ((fd = fopen(_PATH_FTPWELCOME, "r")) != NULL) {
- while (fgets(line, sizeof(line), fd) != NULL) {
- if ((cp = strchr(line, '\n')) != NULL)
- *cp = '\0';
- lreply(220, "%s", line);
- }
- (void) fflush(stdout);
- (void) fclose(fd);
- /* reply(220,) must follow */
- }
-
- hostname = localhost ();
- if (! hostname)
- perror_reply (550, "Local resource failure: malloc");
-
- reply(220, "%s FTP server (%s) ready.", hostname, version);
- (void) setjmp(errcatch);
- for (;;)
- (void) yyparse();
- /* NOTREACHED */
- }
-
- static void
- lostconn(signo)
- int signo;
- {
-
- if (debug)
- syslog(LOG_DEBUG, "lost connection");
- dologout(-1);
- }
-
- static char ttyline[20];
-
- /*
- * Helper function for sgetpwnam().
- */
- static char *
- sgetsave(s)
- char *s;
- {
- char *new = malloc((unsigned) strlen(s) + 1);
-
- if (new == NULL) {
- perror_reply(421, "Local resource failure: malloc");
- dologout(1);
- /* NOTREACHED */
- }
- (void) strcpy(new, s);
- return (new);
- }
-
- /*
- * Save the result of a getpwnam. Used for USER command, since
- * the data returned must not be clobbered by any other command
- * (e.g., globbing).
- */
- static struct passwd *
- sgetpwnam(name)
- char *name;
- {
- static struct passwd save;
- struct passwd *p;
-
- if ((p = getpwnam(name)) == NULL)
- return (p);
- if (save.pw_name) {
- free(save.pw_name);
- free(save.pw_passwd);
- free(save.pw_gecos);
- free(save.pw_dir);
- free(save.pw_shell);
- }
- save = *p;
- save.pw_name = sgetsave(p->pw_name);
- save.pw_passwd = sgetsave(p->pw_passwd);
- save.pw_gecos = sgetsave(p->pw_gecos);
- save.pw_dir = sgetsave(p->pw_dir);
- save.pw_shell = sgetsave(p->pw_shell);
- return (&save);
- }
-
- static int login_attempts; /* number of failed login attempts */
- static int askpasswd; /* had user command, ask for passwd */
- static char curname[10]; /* current USER name */
-
- /*
- * USER command.
- * Sets global passwd pointer pw if named account exists and is acceptable;
- * sets askpasswd if a PASS command is expected. If logged in previously,
- * need to reset state. If name is "ftp" or "anonymous", the name is not in
- * _PATH_FTPUSERS, and ftp account exists, set guest and pw, then just return.
- * If account doesn't exist, ask for passwd anyway. Otherwise, check user
- * requesting login privileges. Disallow anyone who does not have a standard
- * shell as returned by getusershell(). Disallow anyone mentioned in the file
- * _PATH_FTPUSERS to allow people such as root and uucp to be avoided.
- */
- void
- user(name)
- char *name;
- {
- char *cp, *shell;
-
- if (logged_in) {
- if (guest) {
- reply(530, "Can't change user from guest login.");
- return;
- }
- end_login();
- }
-
- guest = 0;
- if (strcmp(name, "ftp") == 0 || strcmp(name, "anonymous") == 0) {
- if (checkuser("ftp") || checkuser("anonymous"))
- reply(530, "User %s access denied.", name);
- else if ((pw = sgetpwnam("ftp")) != NULL) {
- guest = 1;
- askpasswd = 1;
- reply(331,
- "Guest login ok, type your name as password.");
- } else
- reply(530, "User %s unknown.", name);
- if (!askpasswd && logging)
- syslog(LOG_NOTICE,
- "ANONYMOUS FTP LOGIN REFUSED FROM %s", remotehost);
- return;
- }
- if (pw = sgetpwnam(name)) {
- if ((shell = pw->pw_shell) == NULL || *shell == 0)
- shell = _PATH_BSHELL;
- while ((cp = getusershell()) != NULL)
- if (strcmp(cp, shell) == 0)
- break;
- endusershell();
-
- if (cp == NULL || checkuser(name)) {
- reply(530, "User %s access denied.", name);
- if (logging)
- syslog(LOG_NOTICE,
- "FTP LOGIN REFUSED FROM %s, %s",
- remotehost, name);
- pw = (struct passwd *) NULL;
- return;
- }
- }
- if (logging)
- strncpy(curname, name, sizeof(curname)-1);
- if (pw && *pw->pw_passwd) {
- reply(331, "Password required for %s.", name);
- askpasswd = 1;
- }
- /*
- * Delay before reading passwd after first failed
- * attempt to slow down passwd-guessing programs.
- */
- if (login_attempts)
- sleep((unsigned) login_attempts);
- }
-
- /*
- * Check if a user is in the file _PATH_FTPUSERS
- */
- static int
- checkuser(name)
- char *name;
- {
- FILE *fd;
- int found = 0;
- char *p, line[BUFSIZ];
-
- if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) {
- while (fgets(line, sizeof(line), fd) != NULL)
- if ((p = strchr(line, '\n')) != NULL) {
- *p = '\0';
- if (line[0] == '#')
- continue;
- if (strcmp(line, name) == 0) {
- found = 1;
- break;
- }
- }
- (void) fclose(fd);
- }
- return (found);
- }
-
- /*
- * Terminate login as previous user, if any, resetting state;
- * used when USER command is given or login fails.
- */
- static void
- end_login()
- {
-
- (void) seteuid((uid_t)0);
- if (logged_in)
- logwtmp(ttyline, "", "");
- pw = NULL;
- logged_in = 0;
- guest = 0;
- }
-
- void
- pass(passwd)
- char *passwd;
- {
- char *salt, *xpasswd;
- FILE *fd;
-
- if (logged_in || askpasswd == 0) {
- reply(503, "Login with USER first.");
- return;
- }
- askpasswd = 0;
- if (!guest && (!pw || *pw->pw_passwd)) {
- salt = pw ? pw->pw_passwd : "xx";
- xpasswd = CRYPT (passwd, salt);
- if (pw && *pw->pw_passwd && strcmp(xpasswd, pw->pw_passwd)) {
- reply(530, "Login incorrect.");
- if (logging)
- syslog(LOG_NOTICE,
- "FTP LOGIN FAILED FROM %s, %s",
- remotehost, curname);
- pw = NULL;
- if (login_attempts++ >= 5) {
- syslog(LOG_NOTICE,
- "repeated login failures from %s",
- remotehost);
- exit(0);
- }
- return;
- }
- }
- login_attempts = 0; /* this time successful */
- if (setegid((gid_t)pw->pw_gid) < 0) {
- reply(550, "Can't set gid.");
- return;
- }
- (void) initgroups(pw->pw_name, pw->pw_gid);
-
- /* open wtmp before chroot */
- (void)sprintf(ttyline, "ftp%d", getpid());
- logwtmp(ttyline, pw->pw_name, remotehost);
- logged_in = 1;
-
- if (guest) {
- /*
- * We MUST do a chdir() after the chroot. Otherwise
- * the old current directory will be accessible as "."
- * outside the new root!
- */
- if (chroot(pw->pw_dir) < 0 || chdir("/") < 0) {
- reply(550, "Can't set guest privileges.");
- goto bad;
- }
- } else if (chdir(pw->pw_dir) < 0) {
- if (chdir("/") < 0) {
- reply(530, "User %s: can't change directory to %s.",
- pw->pw_name, pw->pw_dir);
- goto bad;
- } else
- lreply(230, "No directory! Logging in with home=/");
- }
- if (seteuid((uid_t)pw->pw_uid) < 0) {
- reply(550, "Can't set uid.");
- goto bad;
- }
- /*
- * Display a login message, if it exists.
- * N.B. reply(230,) must follow the message.
- */
- if ((fd = fopen(_PATH_FTPLOGINMESG, "r")) != NULL) {
- char *cp, line[LINE_MAX];
-
- while (fgets(line, sizeof(line), fd) != NULL) {
- if ((cp = strchr(line, '\n')) != NULL)
- *cp = '\0';
- lreply(230, "%s", line);
- }
- (void) fflush(stdout);
- (void) fclose(fd);
- }
- if (guest) {
- reply(230, "Guest login ok, access restrictions apply.");
- #ifdef SETPROCTITLE
- snprintf(proctitle, sizeof(proctitle),
- "%s: anonymous/%.*s", remotehost,
- sizeof(proctitle) - sizeof(remotehost) -
- sizeof(": anonymous/"), passwd);
- setproctitle(proctitle);
- #endif /* SETPROCTITLE */
- if (logging)
- syslog(LOG_INFO, "ANONYMOUS FTP LOGIN FROM %s, %s",
- remotehost, passwd);
- } else {
- reply(230, "User %s logged in.", pw->pw_name);
- #ifdef SETPROCTITLE
- snprintf(proctitle, sizeof(proctitle),
- "%s: %s", remotehost, pw->pw_name);
- setproctitle(proctitle);
- #endif /* SETPROCTITLE */
- if (logging)
- syslog(LOG_INFO, "FTP LOGIN FROM %s as %s",
- remotehost, pw->pw_name);
- }
- (void) umask(defumask);
- return;
- bad:
- /* Forget all about it... */
- end_login();
- }
-
- void
- retrieve(cmd, name)
- char *cmd, *name;
- {
- FILE *fin, *dout;
- struct stat st;
- int (*closefunc) __P((FILE *));
-
- if (cmd == 0) {
- fin = fopen(name, "r"), closefunc = fclose;
- st.st_size = 0;
- } else {
- char line[BUFSIZ];
-
- (void) sprintf(line, cmd, name), name = line;
- fin = ftpd_popen(line, "r"), closefunc = ftpd_pclose;
- st.st_size = -1;
- st.st_blksize = BUFSIZ;
- }
- if (fin == NULL) {
- if (errno != 0) {
- perror_reply(550, name);
- if (cmd == 0) {
- LOGCMD("get", name);
- }
- }
- return;
- }
- byte_count = -1;
- if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || !S_ISREG(st.st_mode))) {
- reply(550, "%s: not a plain file.", name);
- goto done;
- }
- if (restart_point) {
- if (type == TYPE_A) {
- off_t i, n;
- int c;
-
- n = restart_point;
- i = 0;
- while (i++ < n) {
- if ((c=getc(fin)) == EOF) {
- perror_reply(550, name);
- goto done;
- }
- if (c == '\n')
- i++;
- }
- } else if (lseek(fileno(fin), restart_point, L_SET) < 0) {
- perror_reply(550, name);
- goto done;
- }
- }
- dout = dataconn(name, st.st_size, "w");
- if (dout == NULL)
- goto done;
- send_data(fin, dout, st.st_blksize);
- (void) fclose(dout);
- data = -1;
- pdata = -1;
- done:
- if (cmd == 0)
- LOGBYTES("get", name, byte_count);
- (*closefunc)(fin);
- }
-
- void
- store(name, mode, unique)
- char *name, *mode;
- int unique;
- {
- FILE *fout, *din;
- struct stat st;
- int (*closefunc) __P((FILE *));
-
- if (unique && stat(name, &st) == 0 &&
- (name = gunique(name)) == NULL) {
- LOGCMD(*mode == 'w' ? "put" : "append", name);
- return;
- }
-
- if (restart_point)
- mode = "r+";
- fout = fopen(name, mode);
- closefunc = fclose;
- if (fout == NULL) {
- perror_reply(553, name);
- LOGCMD(*mode == 'w' ? "put" : "append", name);
- return;
- }
- byte_count = -1;
- if (restart_point) {
- if (type == TYPE_A) {
- off_t i, n;
- int c;
-
- n = restart_point;
- i = 0;
- while (i++ < n) {
- if ((c=getc(fout)) == EOF) {
- perror_reply(550, name);
- goto done;
- }
- if (c == '\n')
- i++;
- }
- /*
- * We must do this seek to "current" position
- * because we are changing from reading to
- * writing.
- */
- if (fseek(fout, 0L, L_INCR) < 0) {
- perror_reply(550, name);
- goto done;
- }
- } else if (lseek(fileno(fout), restart_point, L_SET) < 0) {
- perror_reply(550, name);
- goto done;
- }
- }
- din = dataconn(name, (off_t)-1, "r");
- if (din == NULL)
- goto done;
- if (receive_data(din, fout) == 0) {
- if (unique)
- reply(226, "Transfer complete (unique file name:%s).",
- name);
- else
- reply(226, "Transfer complete.");
- }
- (void) fclose(din);
- data = -1;
- pdata = -1;
- done:
- LOGBYTES(*mode == 'w' ? "put" : "append", name, byte_count);
- (*closefunc)(fout);
- }
-
- static FILE *
- getdatasock(mode)
- char *mode;
- {
- int on = 1, s, t, tries;
-
- if (data >= 0)
- return (fdopen(data, mode));
- (void) seteuid((uid_t)0);
- s = socket(AF_INET, SOCK_STREAM, 0);
- if (s < 0)
- goto bad;
- 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;
- for (tries = 1; ; tries++) {
- if (bind(s, (struct sockaddr *)&data_source,
- sizeof(data_source)) >= 0)
- break;
- if (errno != EADDRINUSE || tries > 10)
- goto bad;
- sleep(tries);
- }
- (void) seteuid((uid_t)pw->pw_uid);
- #if defined (IP_TOS) && defined (IPTOS_THROUGHPUT) && defined (IPPROTO_IP)
- on = IPTOS_THROUGHPUT;
- if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
- syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
- #endif
- return (fdopen(s, mode));
- bad:
- /* Return the real value of errno (close may change it) */
- t = errno;
- (void) seteuid((uid_t)pw->pw_uid);
- (void) close(s);
- errno = t;
- return (NULL);
- }
-
- static FILE *
- dataconn(name, size, mode)
- char *name;
- off_t size;
- char *mode;
- {
- char sizebuf[32];
- FILE *file;
- int retry = 0, tos;
-
- file_size = size;
- byte_count = 0;
- if (size != (off_t) -1)
- (void) sprintf(sizebuf, " (%s bytes)", off_to_str (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;
- #if defined (IP_TOS) && defined (IPTOS_LOWDELAY) && defined (IPPROTO_IP)
- tos = IPTOS_LOWDELAY;
- (void) setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos,
- sizeof(int));
- #endif
- reply(150, "Opening %s mode data connection for '%s'%s.",
- type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
- return (fdopen(pdata, mode));
- }
- if (data >= 0) {
- reply(125, "Using existing data connection for '%s'%s.",
- 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), strerror(errno));
- return (NULL);
- }
- data = fileno(file);
- while (connect(data, (struct sockaddr *)&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, "Opening %s mode data connection for '%s'%s.",
- type == TYPE_A ? "ASCII" : "BINARY", name, sizebuf);
- return (file);
- }
-
- /*
- * Tranfer the contents of "instr" to "outstr" peer using the appropriate
- * encapsulation of the data subject * to Mode, Structure, and Type.
- *
- * NB: Form isn't handled.
- */
- static void
- send_data(instr, outstr, blksize)
- FILE *instr, *outstr;
- off_t blksize;
- {
- int c, cnt, filefd, netfd;
- char *buf;
-
- transflag++;
- if (setjmp(urgcatch)) {
- transflag = 0;
- return;
- }
- switch (type) {
-
- case TYPE_A:
- while ((c = getc(instr)) != EOF) {
- byte_count++;
- if (c == '\n') {
- if (ferror(outstr))
- goto data_err;
- (void) putc('\r', outstr);
- }
- (void) putc(c, outstr);
- }
- fflush(outstr);
- transflag = 0;
- if (ferror(instr))
- goto file_err;
- if (ferror(outstr))
- goto data_err;
- reply(226, "Transfer complete.");
- return;
-
- case TYPE_I:
- case TYPE_L:
- if ((buf = malloc((u_int)blksize)) == NULL) {
- transflag = 0;
- perror_reply(451, "Local resource failure: malloc");
- return;
- }
- netfd = fileno(outstr);
- filefd = fileno(instr);
- while ((cnt = read(filefd, buf, (u_int)blksize)) > 0 &&
- write(netfd, buf, cnt) == cnt)
- byte_count += cnt;
- transflag = 0;
- (void)free(buf);
- if (cnt != 0) {
- if (cnt < 0)
- goto file_err;
- goto data_err;
- }
- reply(226, "Transfer complete.");
- return;
- default:
- transflag = 0;
- reply(550, "Unimplemented TYPE %d in send_data", type);
- return;
- }
-
- data_err:
- transflag = 0;
- perror_reply(426, "Data connection");
- return;
-
- file_err:
- transflag = 0;
- perror_reply(551, "Error on input file");
- }
-
- /*
- * 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.
- */
- static int
- receive_data(instr, outstr)
- FILE *instr, *outstr;
- {
- int c;
- int cnt, bare_lfs = 0;
- char buf[BUFSIZ];
-
- 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) != cnt)
- goto file_err;
- byte_count += cnt;
- }
- if (cnt < 0)
- goto data_err;
- transflag = 0;
- return (0);
-
- case TYPE_E:
- reply(553, "TYPE E not implemented.");
- transflag = 0;
- return (-1);
-
- case TYPE_A:
- while ((c = getc(instr)) != EOF) {
- byte_count++;
- if (c == '\n')
- bare_lfs++;
- while (c == '\r') {
- if (ferror(outstr))
- goto data_err;
- if ((c = getc(instr)) != '\n') {
- (void) putc ('\r', outstr);
- if (c == '\0' || c == EOF)
- goto contin2;
- }
- }
- (void) putc(c, outstr);
- contin2: ;
- }
- fflush(outstr);
- if (ferror(instr))
- goto data_err;
- if (ferror(outstr))
- goto file_err;
- transflag = 0;
- if (bare_lfs) {
- lreply(226,
- "WARNING! %d bare linefeeds received in ASCII mode",
- bare_lfs);
- (void)printf(" File may not have transferred correctly.\r\n");
- }
- return (0);
- default:
- reply(550, "Unimplemented TYPE %d in receive_data", type);
- transflag = 0;
- return (-1);
- }
-
- data_err:
- transflag = 0;
- perror_reply(426, "Data Connection");
- return (-1);
-
- file_err:
- transflag = 0;
- perror_reply(452, "Error writing file");
- return (-1);
- }
-
- void
- statfilecmd(filename)
- char *filename;
- {
- FILE *fin;
- int c;
- char line[LINE_MAX];
-
- (void)snprintf(line, sizeof(line), "/bin/ls -lgA %s", filename);
- fin = ftpd_popen(line, "r");
- lreply(211, "status of %s:", filename);
- while ((c = getc(fin)) != EOF) {
- if (c == '\n') {
- if (ferror(stdout)){
- perror_reply(421, "control connection");
- (void) ftpd_pclose(fin);
- dologout(1);
- /* NOTREACHED */
- }
- if (ferror(fin)) {
- perror_reply(551, filename);
- (void) ftpd_pclose(fin);
- return;
- }
- (void) putc('\r', stdout);
- }
- (void) putc(c, stdout);
- }
- (void) ftpd_pclose(fin);
- reply(211, "End of Status");
- }
-
- void
- statcmd()
- {
- struct sockaddr_in *sin;
- u_char *a, *p;
-
- lreply(211, "%s FTP server status:", hostname, version);
- printf(" %s\r\n", version);
- printf(" Connected to %s", remotehost);
- if (!isdigit(remotehost[0]))
- printf(" (%s)", inet_ntoa(his_addr.sin_addr));
- printf("\r\n");
- if (logged_in) {
- if (guest)
- printf(" Logged in anonymously\r\n");
- else
- printf(" Logged in as %s\r\n", pw->pw_name);
- } else if (askpasswd)
- printf(" Waiting for password\r\n");
- else
- printf(" Waiting for user name\r\n");
- printf(" TYPE: %s", typenames[type]);
- if (type == TYPE_A || type == TYPE_E)
- printf(", FORM: %s", formnames[form]);
- if (type == TYPE_L)
- #ifdef CHAR_BIT
- printf(" %d", CHAR_BIT);
- #else
- #if NBBY == 8
- printf(" %d", NBBY);
- #else
- printf(" %d", bytesize); /* need definition! */
- #endif
- #endif
- printf("; STRUcture: %s; transfer MODE: %s\r\n",
- strunames[stru], modenames[mode]);
- if (data != -1)
- printf(" Data connection open\r\n");
- else if (pdata != -1) {
- printf(" in Passive mode");
- sin = &pasv_addr;
- goto printaddr;
- } else if (usedefault == 0) {
- printf(" PORT");
- sin = &data_dest;
- printaddr:
- a = (u_char *) &sin->sin_addr;
- p = (u_char *) &sin->sin_port;
- #define UC(b) (((int) b) & 0xff)
- printf(" (%d,%d,%d,%d,%d,%d)\r\n", UC(a[0]),
- UC(a[1]), UC(a[2]), UC(a[3]), UC(p[0]), UC(p[1]));
- #undef UC
- } else
- printf(" No data connection\r\n");
- reply(211, "End of status");
- }
-
- void
- fatal(s)
- char *s;
- {
-
- reply(451, "Error in server: %s\n", s);
- reply(221, "Closing connection due to server error.");
- dologout(0);
- /* NOTREACHED */
- }
-
- void
- #if __STDC__
- reply(int n, const char *fmt, ...)
- #else
- reply(n, fmt, va_alist)
- int n;
- char *fmt;
- va_dcl
- #endif
- {
- va_list ap;
- #if __STDC__
- va_start(ap, fmt);
- #else
- va_start(ap);
- #endif
- (void)printf("%d ", n);
- (void)vprintf(fmt, ap);
- (void)printf("\r\n");
- (void)fflush(stdout);
- if (debug) {
- syslog(LOG_DEBUG, "<--- %d ", n);
- vsyslog(LOG_DEBUG, fmt, ap);
- }
- }
-
- void
- #if __STDC__
- lreply(int n, const char *fmt, ...)
- #else
- lreply(n, fmt, va_alist)
- int n;
- char *fmt;
- va_dcl
- #endif
- {
- va_list ap;
- #if __STDC__
- va_start(ap, fmt);
- #else
- va_start(ap);
- #endif
- (void)printf("%d- ", n);
- (void)vprintf(fmt, ap);
- (void)printf("\r\n");
- (void)fflush(stdout);
- if (debug) {
- syslog(LOG_DEBUG, "<--- %d- ", n);
- vsyslog(LOG_DEBUG, fmt, ap);
- }
- }
-
- static void
- ack(s)
- char *s;
- {
-
- reply(250, "%s command successful.", s);
- }
-
- void
- nack(s)
- char *s;
- {
-
- reply(502, "%s command not implemented.", s);
- }
-
- /* ARGSUSED */
- void
- yyerror(s)
- char *s;
- {
- char *cp;
-
- if (cp = strchr(cbuf,'\n'))
- *cp = '\0';
- reply(500, "'%s': command not understood.", cbuf);
- }
-
- void
- delete(name)
- char *name;
- {
- struct stat st;
-
- LOGCMD("delete", name);
- 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");
- }
-
- void
- cwd(path)
- char *path;
- {
-
- if (chdir(path) < 0)
- perror_reply(550, path);
- else
- ack("CWD");
- }
-
- void
- makedir(name)
- char *name;
- {
-
- LOGCMD("mkdir", name);
- if (mkdir(name, 0777) < 0)
- perror_reply(550, name);
- else
- reply(257, "MKD command successful.");
- }
-
- void
- removedir(name)
- char *name;
- {
-
- LOGCMD("rmdir", name);
- if (rmdir(name) < 0)
- perror_reply(550, name);
- else
- ack("RMD");
- }
-
- void
- pwd()
- {
- char *path = getcwd (0, 0);
- if (path) {
- reply(257, "\"%s\" is current directory.", path);
- free (path);
- } else
- reply(550, "%s.", strerror (errno));
- }
-
- 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);
- }
-
- void
- renamecmd(from, to)
- char *from, *to;
- {
-
- LOGCMD2("rename", from, to);
- if (rename(from, to) < 0)
- perror_reply(550, "rename");
- else
- ack("RNTO");
- }
-
- static void
- dolog(sin)
- struct sockaddr_in *sin;
- {
- char *name;
- struct hostent *hp = gethostbyaddr((char *)&sin->sin_addr,
- sizeof(struct in_addr), AF_INET);
-
- if (hp)
- name = hp->h_name;
- else
- name = inet_ntoa(sin->sin_addr);
-
- if (remotehost)
- free (remotehost);
- remotehost = malloc (strlen (name));
- strcpy (remotehost, name);
-
- #ifdef SETPROCTITLE
- snprintf(proctitle, sizeof(proctitle), "%s: connected", remotehost);
- setproctitle(proctitle);
- #endif /* SETPROCTITLE */
-
- if (logging)
- syslog(LOG_INFO, "connection from %s", remotehost);
- }
-
- /*
- * Record logout in wtmp file
- * and exit with supplied status.
- */
- void
- dologout(status)
- int status;
- {
-
- if (logged_in) {
- (void) seteuid((uid_t)0);
- logwtmp(ttyline, "", "");
- }
- /* beware of flushing buffers after a SIGPIPE */
- _exit(status);
- }
-
- static void
- myoob(signo)
- int signo;
- {
- char *cp;
-
- /* only process if transfer occurring */
- if (!transflag)
- return;
- cp = tmpline;
- if (telnet_fgets(cp, 7, stdin) == NULL) {
- reply(221, "You could at least say goodbye.");
- dologout(0);
- }
- upper(cp);
- if (strcmp(cp, "ABOR\r\n") == 0) {
- tmpline[0] = '\0';
- reply(426, "Transfer aborted. Data connection closed.");
- reply(226, "Abort successful");
- longjmp(urgcatch, 1);
- }
- if (strcmp(cp, "STAT\r\n") == 0) {
- if (file_size != (off_t) -1)
- reply(213, "Status: %s of %s bytes transferred",
- off_to_str (byte_count), off_to_str (file_size));
- else
- reply(213, "Status: %s bytes transferred",
- off_to_str (byte_count));
- }
- }
-
- /*
- * Note: a response of 425 is not mentioned as a possible response to
- * the PASV command in RFC959. However, it has been blessed as
- * a legitimate response by Jon Postel in a telephone conversation
- * with Rick Adams on 25 Jan 89.
- */
- void
- passive()
- {
- int len;
- char *p, *a;
-
- pdata = socket(AF_INET, SOCK_STREAM, 0);
- if (pdata < 0) {
- perror_reply(425, "Can't open passive connection");
- return;
- }
- pasv_addr = ctrl_addr;
- pasv_addr.sin_port = 0;
- (void) seteuid((uid_t)0);
- if (bind(pdata, (struct sockaddr *)&pasv_addr, sizeof(pasv_addr)) < 0) {
- (void) seteuid((uid_t)pw->pw_uid);
- goto pasv_error;
- }
- (void) seteuid((uid_t)pw->pw_uid);
- len = sizeof(pasv_addr);
- if (getsockname(pdata, (struct sockaddr *) &pasv_addr, &len) < 0)
- goto pasv_error;
- if (listen(pdata, 1) < 0)
- goto pasv_error;
- a = (char *) &pasv_addr.sin_addr;
- p = (char *) &pasv_addr.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]));
- return;
-
- pasv_error:
- (void) close(pdata);
- pdata = -1;
- perror_reply(425, "Can't open passive connection");
- return;
- }
-
- /*
- * Generate unique name for file with basename "local".
- * The file named "local" is already known to exist.
- * Generates failure reply on error.
- */
- static char *
- gunique(local)
- char *local;
- {
- static char *new = 0;
- struct stat st;
- int count;
- char *cp;
-
- cp = strrchr(local, '/');
- if (cp)
- *cp = '\0';
- if (stat(cp ? local : ".", &st) < 0) {
- perror_reply(553, cp ? local : ".");
- return ((char *) 0);
- }
- if (cp)
- *cp = '/';
-
- if (new)
- free (new);
-
- new = malloc (strlen (local) + 5); /* '.' + DIG + DIG + '\0' */
- if (new) {
- 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 (NULL);
- }
-
- /*
- * Format and send reply containing system error number.
- */
- void
- perror_reply(code, string)
- int code;
- char *string;
- {
-
- reply(code, "%s: %s.", string, strerror(errno));
- }
-
- static char *onefile[] = {
- "",
- 0
- };
-
- void
- send_file_list(whichf)
- char *whichf;
- {
- struct stat st;
- DIR *dirp = NULL;
- struct dirent *dir;
- FILE *dout = NULL;
- char **dirlist, *dirname;
- int simple = 0;
- int freeglob = 0;
- glob_t gl;
-
- if (strpbrk(whichf, "~{[*?") != NULL) {
- int flags = GLOB_NOCHECK;
-
- #ifdef GLOB_BRACE
- flags |= GLOB_BRACE;
- #endif
- #ifdef GLOB_QUOTE
- flags |= GLOB_QUOTE;
- #endif
- #ifdef GLOB_TILDE
- flags |= GLOB_TILDE;
- #endif
-
- memset(&gl, 0, sizeof(gl));
- freeglob = 1;
- if (glob(whichf, flags, 0, &gl)) {
- reply(550, "not found");
- goto out;
- } else if (gl.gl_pathc == 0) {
- errno = ENOENT;
- perror_reply(550, whichf);
- goto out;
- }
- dirlist = gl.gl_pathv;
- } else {
- onefile[0] = whichf;
- dirlist = onefile;
- simple = 1;
- }
-
- if (setjmp(urgcatch)) {
- transflag = 0;
- goto out;
- }
- while (dirname = *dirlist++) {
- if (stat(dirname, &st) < 0) {
- /*
- * If user typed "ls -l", etc, and the client
- * used NLST, do what the user meant.
- */
- if (dirname[0] == '-' && *dirlist == NULL &&
- transflag == 0) {
- retrieve("/bin/ls %s", dirname);
- goto out;
- }
- perror_reply(550, whichf);
- if (dout != NULL) {
- (void) fclose(dout);
- transflag = 0;
- data = -1;
- pdata = -1;
- }
- goto out;
- }
-
- if (S_ISREG(st.st_mode)) {
- if (dout == NULL) {
- dout = dataconn("file list", (off_t)-1, "w");
- if (dout == NULL)
- goto out;
- transflag++;
- }
- fprintf(dout, "%s%s\n", dirname,
- type == TYPE_A ? "\r" : "");
- byte_count += strlen(dirname) + 1;
- continue;
- } else if (!S_ISDIR(st.st_mode))
- continue;
-
- if ((dirp = opendir(dirname)) == NULL)
- continue;
-
- while ((dir = readdir(dirp)) != NULL) {
- char *nbuf;
-
- if (dir->d_name[0] == '.' && dir->d_namlen == 1)
- continue;
- if (dir->d_name[0] == '.' && dir->d_name[1] == '.' &&
- dir->d_namlen == 2)
- continue;
-
- nbuf = alloca (strlen (dirname) + 1 + strlen (dir->d_name) + 1);
- sprintf(nbuf, "%s/%s", dirname, dir->d_name);
-
- /*
- * We have to do a stat to insure it's
- * not a directory or special file.
- */
- if (simple || (stat(nbuf, &st) == 0 &&
- S_ISREG(st.st_mode))) {
- if (dout == NULL) {
- dout = dataconn("file list", (off_t)-1,
- "w");
- if (dout == NULL)
- goto out;
- transflag++;
- }
- if (nbuf[0] == '.' && nbuf[1] == '/')
- fprintf(dout, "%s%s\n", &nbuf[2],
- type == TYPE_A ? "\r" : "");
- else
- fprintf(dout, "%s%s\n", nbuf,
- type == TYPE_A ? "\r" : "");
- byte_count += strlen(nbuf) + 1;
- }
- }
- (void) closedir(dirp);
- }
-
- if (dout == NULL)
- reply(550, "No files found.");
- else if (ferror(dout) != 0)
- perror_reply(550, "Data connection");
- else
- reply(226, "Transfer complete.");
-
- transflag = 0;
- if (dout != NULL)
- (void) fclose(dout);
- data = -1;
- pdata = -1;
- out:
- if (freeglob) {
- freeglob = 0;
- globfree(&gl);
- }
- }
-
- #ifdef SETPROCTITLE
- /*
- * Clobber argv so ps will show what we're doing. (Stolen from sendmail.)
- * Warning, since this is usually started from inetd.conf, it often doesn't
- * have much of an environment or arglist to overwrite.
- */
- void
- #if __STDC__
- setproctitle(const char *fmt, ...)
- #else
- setproctitle(fmt, va_alist)
- char *fmt;
- va_dcl
- #endif
- {
- int i;
- va_list ap;
- char *p, *bp, ch;
- char buf[LINE_MAX];
-
- #if __STDC__
- va_start(ap, fmt);
- #else
- va_start(ap);
- #endif
- (void)vsnprintf(buf, sizeof(buf), fmt, ap);
-
- /* make ps print our process name */
- p = Argv[0];
- *p++ = '-';
-
- i = strlen(buf);
- if (i > LastArgv - p - 2) {
- i = LastArgv - p - 2;
- buf[i] = '\0';
- }
- bp = buf;
- while (ch = *bp++)
- if (ch != '\n' && ch != '\r')
- *p++ = ch;
- while (p < LastArgv)
- *p++ = ' ';
- }
- #endif /* SETPROCTITLE */
-