/* * Copyright (c) 1985, 1988, 1990 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, 1988, 1990 Regents of the University of California.\n\ All rights reserved.\n"; #endif /* not lint */ #ifndef lint static char sccsid[] = "@(#)ftpd.c 5.40 (Berkeley) 7/2/91"; #endif /* not lint */ /* * FTP server. */ #include #include #include #include #include #include #include #include #define FTP_NAMES #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "pathnames.h" /* * File containing login names * NOT to be used on this machine. * Commonly used to disallow uucp. */ extern int errno; extern char *crypt(); extern char version[]; extern char *home; /* pointer to home directory for glob */ extern FILE *ftpd_popen(), *fopen(), *freopen(); extern int ftpd_pclose(), fclose(); extern char *getline(); extern char cbuf[]; extern off_t restart_point; 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 */ int 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[MAXHOSTNAMELEN]; char remotehost[MAXHOSTNAMELEN]; /* * 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; void lostconn(), myoob(); FILE *getdatasock(), *dataconn(); #ifdef SETPROCTITLE char **Argv = NULL; /* pointer to argument vector */ char *LastArgv = NULL; /* end of argv */ char proctitle[BUFSIZ]; /* initial part of title */ #endif /* SETPROCTITLE */ main(argc, argv, envp) int argc; char *argv[]; char **envp; { int addrlen, on = 1, tos; char *cp; /* * 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_DAEMON); 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); } #ifdef IP_TOS 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 */ argc--, argv++; while (argc > 0 && *argv[0] == '-') { for (cp = &argv[0][1]; *cp; cp++) switch (*cp) { case 'v': debug = 1; break; case 'd': debug = 1; break; case 'l': logging = 1; break; case 't': timeout = atoi(++cp); if (maxtimeout < timeout) maxtimeout = timeout; goto nextopt; case 'T': maxtimeout = atoi(++cp); if (timeout > maxtimeout) timeout = maxtimeout; goto nextopt; case 'u': { int val = 0; while (*++cp && *cp >= '0' && *cp <= '9') val = val*8 + *cp - '0'; if (*cp) fprintf(stderr, "ftpd: Bad value for -u\n"); else defumask = val; goto nextopt; } default: fprintf(stderr, "ftpd: Unknown flag -%c ignored.\n", *cp); break; } nextopt: argc--, argv++; } (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'; (void) gethostname(hostname, sizeof (hostname)); reply(220, "%s FTP server (%s) ready.", hostname, version); (void) setjmp(errcatch); for (;;) (void) yyparse(); /* NOTREACHED */ } void lostconn() { if (debug) syslog(LOG_DEBUG, "lost connection"); dologout(-1); } static char ttyline[20]; /* * Helper function for sgetpwnam(). */ 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). */ struct passwd * sgetpwnam(name) char *name; { static struct passwd save; register struct passwd *p; char *sgetsave(); 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); } int login_attempts; /* number of failed login attempts */ int askpasswd; /* had user command, ask for passwd */ /* * 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. */ user(name) char *name; { register char *cp; char *shell; char *getusershell(); 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, send ident as password."); } else reply(530, "User %s unknown.", name); 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; } } 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 */ checkuser(name) char *name; { register FILE *fd; register char *p; char line[BUFSIZ]; if ((fd = fopen(_PATH_FTPUSERS, "r")) != NULL) { while (fgets(line, sizeof(line), fd) != NULL) if ((p = index(line, '\n')) != NULL) { *p = '\0'; if (line[0] == '#') continue; if (strcmp(line, name) == 0) return (1); } (void) fclose(fd); } return (0); } /* * Terminate login as previous user, if any, resetting state; * used when USER command is given or login fails. */ end_login() { (void) seteuid((uid_t)0); if (logged_in) logwtmp(ttyline, "", ""); pw = NULL; logged_in = 0; guest = 0; } pass(passwd) char *passwd; { char *xpasswd, *salt; if (logged_in || askpasswd == 0) { reply(503, "Login with USER first."); return; } askpasswd = 0; if (!guest) { /* "ftp" is only account allowed no password */ if (pw == NULL) salt = "xx"; else salt = pw->pw_passwd; #ifdef DES xpasswd = crypt(passwd, salt); #else xpasswd = passwd; #endif /* The strcmp does not catch null passwords! */ if (pw == NULL || *pw->pw_passwd == '\0' || strcmp(xpasswd, pw->pw_passwd)) { reply(530, "Login incorrect."); pw = NULL; if (login_attempts++ >= 5) { syslog(LOG_NOTICE, "repeated login failures from %s", remotehost); exit(0); } return; } } login_attempts = 0; /* this time successful */ (void) setegid((gid_t)pw->pw_gid); (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; } if (guest) { reply(230, "Guest login ok, access restrictions apply."); #ifdef SETPROCTITLE sprintf(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 sprintf(proctitle, "%s: %s", remotehost, pw->pw_name); setproctitle(proctitle); #endif /* SETPROCTITLE */ if (logging) syslog(LOG_INFO, "FTP LOGIN FROM %s, %s", remotehost, pw->pw_name); } home = pw->pw_dir; /* home dir for globbing */ (void) umask(defumask); return; bad: /* Forget all about it... */ end_login(); } retrieve(cmd, name) char *cmd, *name; { FILE *fin, *dout; struct stat st; int (*closefunc)(); 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); return; } if (cmd == 0 && (fstat(fileno(fin), &st) < 0 || (st.st_mode&S_IFMT) != S_IFREG)) { reply(550, "%s: not a plain file.", name); goto done; } if (restart_point) { if (type == TYPE_A) { register int i, n, 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: (*closefunc)(fin); } store(name, mode, unique) char *name, *mode; int unique; { FILE *fout, *din; struct stat st; int (*closefunc)(); char *gunique(); if (unique && stat(name, &st) == 0 && (name = gunique(name)) == NULL) return; if (restart_point) mode = "r+w"; fout = fopen(name, mode); closefunc = fclose; if (fout == NULL) { perror_reply(553, name); return; } if (restart_point) { if (type == TYPE_A) { register int i, n, 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: (*closefunc)(fout); } FILE * getdatasock(mode) char *mode; { int s, on = 1, 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); #ifdef IP_TOS 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: (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, tos; file_size = size; byte_count = 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; #ifdef IP_TOS 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. */ send_data(instr, outstr, blksize) FILE *instr, *outstr; off_t blksize; { register int c, cnt; register char *buf; int netfd, filefd; 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. */ receive_data(instr, outstr) FILE *instr, *outstr; { register 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(230, "WARNING! %d bare linefeeds received in ASCII mode", bare_lfs); 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); } statfilecmd(filename) char *filename; { char line[BUFSIZ]; FILE *fin; int c; (void) sprintf(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"); } 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) #if NBBY == 8 printf(" %d", NBBY); #else printf(" %d", bytesize); /* need definition! */ #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"); } fatal(s) char *s; { reply(451, "Error in server: %s\n", s); reply(221, "Closing connection due to server error."); dologout(0); /* NOTREACHED */ } /* VARARGS2 */ reply(n, fmt, p0, p1, p2, p3, p4, p5) int n; char *fmt; { printf("%d ", n); printf(fmt, p0, p1, p2, p3, p4, p5); printf("\r\n"); (void)fflush(stdout); if (debug) { syslog(LOG_DEBUG, "<--- %d ", n); syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); } } /* VARARGS2 */ lreply(n, fmt, p0, p1, p2, p3, p4, p5) int n; char *fmt; { printf("%d- ", n); printf(fmt, p0, p1, p2, p3, p4, p5); printf("\r\n"); (void)fflush(stdout); if (debug) { syslog(LOG_DEBUG, "<--- %d- ", n); syslog(LOG_DEBUG, fmt, p0, p1, p2, p3, p4, p5); } } 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; if (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); else 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); else ack("RMD"); } pwd() { char path[MAXPATHLEN + 1]; extern char *getwd(); if (getwd(path) == (char *)NULL) reply(550, "%s.", path); else 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"); else 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)); #ifdef SETPROCTITLE sprintf(proctitle, "%s: connected", remotehost); setproctitle(proctitle); #endif /* SETPROCTITLE */ if (logging) { 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); } void 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") == 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: %lu of %lu bytes transferred", byte_count, file_size); else reply(213, "Status: %lu bytes transferred", 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. */ passive() { int len; register 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. */ char * gunique(local) char *local; { static char new[MAXPATHLEN]; struct stat st; char *cp = rindex(local, '/'); int count = 0; if (cp) *cp = '\0'; if (stat(cp ? local : ".", &st) < 0) { perror_reply(553, cp ? local : "."); return((char *) 0); } if (cp) *cp = '/'; (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; { reply(code, "%s: %s.", string, strerror(errno)); } static char *onefile[] = { "", 0 }; send_file_list(whichfiles) char *whichfiles; { struct stat st; DIR *dirp = NULL; struct dirent *dir; FILE *dout = NULL; register char **dirlist, *dirname; int simple = 0; char *strpbrk(); if (strpbrk(whichfiles, "~{[*?") != NULL) { extern char **ftpglob(), *globerr; globerr = NULL; dirlist = ftpglob(whichfiles); if (globerr != NULL) { reply(550, globerr); return; } else if (dirlist == NULL) { errno = ENOENT; perror_reply(550, whichfiles); return; } } else { onefile[0] = whichfiles; dirlist = onefile; simple = 1; } if (setjmp(urgcatch)) { transflag = 0; return; } 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); return; } perror_reply(550, whichfiles); if (dout != NULL) { (void) fclose(dout); transflag = 0; data = -1; pdata = -1; } return; } if ((st.st_mode&S_IFMT) == S_IFREG) { if (dout == NULL) { dout = dataconn("file list", (off_t)-1, "w"); if (dout == NULL) return; transflag++; } fprintf(dout, "%s%s\n", dirname, type == TYPE_A ? "\r" : ""); byte_count += strlen(dirname) + 1; continue; } else if ((st.st_mode&S_IFMT) != S_IFDIR) continue; if ((dirp = opendir(dirname)) == NULL) continue; while ((dir = readdir(dirp)) != NULL) { char nbuf[MAXPATHLEN]; if (dir->d_name[0] == '.' && dir->d_namlen == 1) continue; if (dir->d_name[0] == '.' && dir->d_name[1] == '.' && dir->d_namlen == 2) continue; 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 && (st.st_mode&S_IFMT) == S_IFREG)) { if (dout == NULL) { dout = dataconn("file list", (off_t)-1, "w"); if (dout == NULL) return; 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; } #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. */ /*VARARGS1*/ setproctitle(fmt, a, b, c) char *fmt; { register char *p, *bp, ch; register int i; char buf[BUFSIZ]; (void) sprintf(buf, fmt, a, b, c); /* 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 */