468 lines
9.5 KiB
C
468 lines
9.5 KiB
C
/*
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* ----------------------------------------------------------------------------
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* "THE BEER-WARE LICENSE" (Revision 42):
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* <phk@login.dknet.dk> wrote this file. As long as you retain this notice you
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* can do whatever you want with this stuff. If we meet some day, and you think
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* this stuff is worth it, you can buy me a beer in return. Poul-Henning Kamp
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* ----------------------------------------------------------------------------
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*
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* $Id: ftp.c,v 1.17 1996/07/08 10:08:00 jkh Exp $
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*
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* Return values have been sanitized:
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* -1 error, but you (still) have a session.
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* -2 error, your session is dead.
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*
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <netdb.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <stdarg.h>
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#include <string.h>
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#include <signal.h>
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#include <errno.h>
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#include <ctype.h>
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#include "ftp.h"
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <arpa/inet.h>
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/* Handy global for us to stick the port # */
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int FtpPort;
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/* How to see by a given code whether or not the connection has timed out */
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#define FTP_TIMEOUT(code) (code == 421)
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#ifndef STANDALONE_FTP
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#include "sysinstall.h"
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#endif /*STANDALONE_FTP*/
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static int sigpipe_caught = 0;
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static void
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catch_pipe(int sig)
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{
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sigpipe_caught = TRUE;
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}
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static void
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debug(FTP_t ftp, const char *fmt, ...)
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{
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char p[BUFSIZ];
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va_list ap;
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va_start(ap, fmt);
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#ifdef STANDALONE_FTP
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strcpy(p,"LIBFTP: ");
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(void) vsnprintf(p + strlen(p), sizeof p - strlen(p), fmt, ap);
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va_end(ap);
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write(ftp->fd_debug, p, strlen(p));
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#else
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if (isDebug()) {
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(void) vsnprintf(p, sizeof p - strlen(p), fmt, ap);
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msgDebug(p);
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}
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#endif
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}
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static int
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writes(int fd, char *s)
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{
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int i = strlen(s);
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signal(SIGPIPE, catch_pipe);
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if (i != write(fd, s, i) || sigpipe_caught) {
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if (sigpipe_caught)
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msgDebug("sigpipe caught during write - connection invalid\n");
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sigpipe_caught = FALSE;
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return IO_ERROR;
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}
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return 0;
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}
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static __inline char*
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get_a_line(FTP_t ftp)
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{
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static char buf[BUFSIZ];
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int i,j;
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signal(SIGPIPE, catch_pipe);
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for(i = 0; i < BUFSIZ;) {
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j = read(ftp->fd_ctrl, buf+i, 1);
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if (j != 1 || sigpipe_caught) {
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if (sigpipe_caught)
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msgDebug("sigpipe caught during read - connection invalid\n");
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sigpipe_caught = FALSE;
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return 0;
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}
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if (buf[i] == '\r' || buf[i] == '\n') {
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if (!i)
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continue;
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buf[i] = '\0';
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debug(ftp, "received <%s>\n", buf);
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return buf;
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}
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i++;
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}
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return buf;
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}
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static int
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get_a_number(FTP_t ftp, char **q)
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{
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char *p;
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int i = -1,j;
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while(1) {
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p = get_a_line(ftp);
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if (!p)
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return IO_ERROR;
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if (!(isdigit(p[0]) && isdigit(p[1]) && isdigit(p[2])))
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continue;
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if (i == -1 && p[3] == '-') {
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i = strtol(p, 0, 0);
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continue;
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}
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if (p[3] != ' ' && p[3] != '\t')
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continue;
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j = strtol(p, 0, 0);
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if (i == -1) {
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if (q) *q = p+4;
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return j;
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} else if (j == i) {
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if (q) *q = p+4;
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return j;
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}
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}
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}
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static int
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zap(FTP_t ftp)
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{
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int i;
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i = writes(ftp->fd_ctrl,"QUIT\r\n");
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if (isDebug())
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msgDebug("Zapping ftp connection on %d returns %d\n", ftp->fd_ctrl, i);
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close(ftp->fd_ctrl); ftp->fd_ctrl = -1;
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close(ftp->fd_xfer); ftp->fd_xfer = -1;
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ftp->state = init;
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return IO_ERROR;
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}
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static int
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botch(FTP_t ftp, char *func, char *state)
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{
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debug(ftp, "Botch: %s called outside state %s\n",func,state);
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return IO_ERROR;
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}
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static int
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cmd(FTP_t ftp, const char *fmt, ...)
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{
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char p[BUFSIZ];
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int i;
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va_list ap;
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va_start(ap, fmt);
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(void) vsnprintf(p, sizeof p, fmt, ap);
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va_end(ap);
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debug(ftp, "send <%s>\n", p);
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strcat(p,"\r\n");
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if (writes(ftp->fd_ctrl, p))
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return IO_ERROR;
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i = get_a_number(ftp, 0);
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return i;
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}
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FTP_t
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FtpInit()
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{
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FTP_t ftp;
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ftp = malloc(sizeof *ftp);
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if (!ftp)
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return ftp;
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memset(ftp, 0, sizeof *ftp);
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ftp->fd_ctrl = -1;
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ftp->fd_xfer = -1;
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ftp->fd_debug = -1;
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ftp->state = init;
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return ftp;
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}
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#ifdef STANDALONE_FTP
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void
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FtpDebug(FTP_t ftp, int i)
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{
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ftp->fd_debug = i;
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}
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#endif
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int
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FtpOpen(FTP_t ftp, char *host, char *user, char *passwd)
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{
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struct hostent *he = NULL;
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struct sockaddr_in sin;
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int s;
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unsigned long temp;
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int i;
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if (ftp->state != init)
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return botch(ftp,"FtpOpen","init");
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if (!user)
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user = "ftp";
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if (!passwd)
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passwd = "??@??(FreeBSD:libftp)"; /* XXX */
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debug(ftp, "FtpOpen(ftp, %s, %s, %s)\n", host, user, passwd);
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temp = inet_addr(host);
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if (temp != INADDR_NONE) {
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debug(ftp, "Using dotted IP address `%s'\n", host);
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ftp->addrtype = sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = temp;
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}
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else {
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debug(ftp, "Trying to resolve `%s'\n", host);
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he = gethostbyname(host);
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if (!he) {
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debug(ftp, "Lookup of `%s' failed!\n", host);
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return zap(ftp);
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}
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ftp->addrtype = sin.sin_family = he->h_addrtype;
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bcopy(he->h_addr, (char *)&sin.sin_addr, he->h_length);
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}
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sin.sin_port = htons(FtpPort ? FtpPort : 21);
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if ((s = socket(ftp->addrtype, SOCK_STREAM, 0)) < 0)
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{
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debug(ftp, "Socket open failed: %s (%i)\n", strerror(errno), errno);
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return zap(ftp);
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}
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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debug(ftp,"Connection failed: %s (%i)\n", strerror(errno), errno);
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(void)close(s);
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return zap(ftp);
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}
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ftp->fd_ctrl = s;
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debug(ftp, "open (%d)\n",get_a_number(ftp,0));
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i = cmd(ftp, "USER %s", user);
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if (i >= 300 && i < 400)
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i = cmd(ftp,"PASS %s",passwd);
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if (i >= 299 || i < 0) {
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close(ftp->fd_ctrl);
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ftp->fd_ctrl = -1;
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return zap(ftp);
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}
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ftp->state = isopen;
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return 0;
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}
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void
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FtpClose(FTP_t ftp)
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{
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if (ftp->state != init)
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return;
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if (ftp->state != isopen)
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botch(ftp,"FtpClose","open or init");
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debug(ftp, "FtpClose(ftp)\n");
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zap(ftp);
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}
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int
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FtpChdir(FTP_t ftp, char *dir)
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{
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int i;
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if (ftp->state != isopen)
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return botch(ftp,"FtpChdir","open");
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i = cmd(ftp, "CWD %s", dir);
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if (i < 0)
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return i;
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else if (i != 250)
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return -1;
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return 0;
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}
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int
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FtpGet(FTP_t ftp, char *file)
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{
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int i,s;
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char *q;
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unsigned char addr[64];
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struct sockaddr_in sin;
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u_long a;
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debug(ftp, "FtpGet(ftp,%s)\n", file);
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if (ftp->state != isopen)
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return botch(ftp, "FtpGet", "open");
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if (ftp->binary) {
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i = cmd(ftp, "TYPE I");
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if (i < 0 || FTP_TIMEOUT(i))
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return zap(ftp);
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if (i > 299)
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return -1;
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}
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else
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return -1;
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if ((s = socket(ftp->addrtype, SOCK_STREAM, 0)) < 0)
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return zap(ftp);
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if (ftp->passive) {
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debug(ftp, "send <%s>\n", "PASV");
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if (writes(ftp->fd_ctrl, "PASV\r\n"))
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return zap(ftp);
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i = get_a_number(ftp, &q);
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if (i < 0)
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return zap(ftp);
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if (i != 227)
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return zap(ftp);
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while (*q && !isdigit(*q))
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q++;
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if (!*q)
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return zap(ftp);
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q--;
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for(i = 0; i < 6; i++) {
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q++;
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addr[i] = strtol(q, &q, 10);
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}
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sin.sin_family = ftp->addrtype;
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bcopy(addr, (char *)&sin.sin_addr, 4);
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bcopy(addr + 4, (char *)&sin.sin_port, 2);
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debug(ftp, "Opening active socket to %s : %u\n", inet_ntoa(sin.sin_addr), htons(sin.sin_port));
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debug(ftp, "Connecting to %s:%u\n", inet_ntoa(sin.sin_addr), htons(sin.sin_port));
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if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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(void)close(s);
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debug(ftp, "connect: %s (%d)\n", strerror(errno), errno);
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return -1;
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}
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ftp->fd_xfer = s;
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i = cmd(ftp,"RETR %s", file);
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if (i < 0 || FTP_TIMEOUT(i)) {
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close(s);
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return zap(ftp);
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}
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else if (i > 299) {
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if (isDebug())
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msgDebug("FTP: No such file %s, moving on.\n", file);
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close(s);
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return -1;
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}
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ftp->state = xfer;
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return s;
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} else {
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i = sizeof sin;
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getsockname(ftp->fd_ctrl, (struct sockaddr *)&sin, &i);
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sin.sin_port = 0;
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i = sizeof sin;
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if (bind(s,(struct sockaddr *)&sin, i) < 0) {
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close (s);
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debug(ftp, "bind failed %d\n", errno);
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return zap(ftp);
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}
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getsockname(s, (struct sockaddr *)&sin, &i);
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if (listen(s, 1) < 0) {
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close (s);
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debug(ftp, "listen failed %d\n", errno);
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return zap(ftp);
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}
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a = ntohl(sin.sin_addr.s_addr);
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i = cmd(ftp, "PORT %d,%d,%d,%d,%d,%d",
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(a >> 24) & 0xff,
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(a >> 16) & 0xff,
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(a >> 8) & 0xff,
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a & 0xff,
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(ntohs(sin.sin_port) >> 8) & 0xff,
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ntohs(sin.sin_port) & 0xff);
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if (i != 200)
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return -1;
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i = cmd(ftp,"RETR %s", file);
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if (i < 0) {
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close(s);
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return zap(ftp);
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}
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else if (i > 299 || FTP_TIMEOUT(i)) {
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if (isDebug())
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msgDebug("FTP: No such file %s, moving on.\n", file);
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close(s);
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if (FTP_TIMEOUT(i))
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return zap(ftp);
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else
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return -1;
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}
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ftp->fd_xfer = accept(s, 0, 0);
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if (ftp->fd_xfer < 0) {
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close(s);
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return zap(ftp);
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}
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ftp->state = xfer;
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close(s);
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return(ftp->fd_xfer);
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}
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}
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int
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FtpEOF(FTP_t ftp)
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{
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int i;
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if (ftp->state != xfer)
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return botch(ftp, "FtpEOF", "xfer");
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debug(ftp, "FtpEOF(ftp)\n");
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close(ftp->fd_xfer);
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ftp->fd_xfer = -1;
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ftp->state = isopen;
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i = get_a_number(ftp,0);
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if (i < 0)
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return zap(ftp);
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else if (i != 250 && i != 226)
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return -1;
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else
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return 0;
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}
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#ifdef STANDALONE_FTP
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/* main.c */
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int
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main(int argc, char **argv)
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{
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FTP_t ftp;
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int i;
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char c;
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ftp = FtpInit();
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if (!ftp)
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err(1, "FtpInit()");
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FtpDebug(ftp, 1);
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i = FtpOpen(ftp, "freefall.cdrom.com", "ftp", "phk-libftp@");
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FtpBinary(ftp, 1);
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FtpPassive(ftp, 0);
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FtpChdir(ftp, "/pub");
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FtpChdir(ftp, "FreeBSD");
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i = FtpGet(ftp, "README");
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while (1 == read(i, &c, 1))
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putchar(c);
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FtpEOF(ftp);
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return 0;
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}
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#endif /*STANDALONE_FTP*/
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