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/* |
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|
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libftp 1.0 (stable): this is an FTP library to simplify the work to a Developer |
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who want to work with FTP servers (RFC 959). |
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Copyright (C) 2007/2008 omnipresent - omnipresent[at]email.it |
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|
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation, either version 3 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/> |
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|
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*/ |
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|
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#include <stdio.h> |
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#include <string.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <sys/types.h> |
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#include <sys/time.h> |
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#include <sys/socket.h> |
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#include <sys/stat.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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#include <fcntl.h> |
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|
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#include "ftp_main.h" |
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|
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/* Global Variable used to store the password length */ |
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|
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int pwd_len = 0; |
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|
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#define USR_TOO_LONG -2 |
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#define PWD_TOO_LONG -2 |
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|
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/*** |
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ftp_connect: |
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- char *host => HostName/IP |
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- int port => Port to connect to |
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- struct sockaddr_in * => pointer to sockaddr_in structure |
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- int verbose => Verbose? |
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. 0 Do not Print |
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. 1 Print |
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- ret => Success? |
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. sock Socket Descriptor Returned |
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.-1 Error |
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***/ |
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|
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|
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|
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int ftp_auth(int sck, char *usr, char *pwd, int verbose) { |
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|
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if (strlen(usr) > 50) { |
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|
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return USR_TOO_LONG; |
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|
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} |
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|
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char *auth = malloc(strlen("USER ")+strlen(usr)+2); |
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char buf[1024]={'\0'}; |
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int n = 0; |
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|
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sprintf(auth, "%s %s\n", "USER", usr); |
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|
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if (write(sck, auth, strlen(auth)) == -1) { |
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|
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if (verbose) { |
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|
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if (errno == EBADF) { |
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|
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fprintf(stderr, "Socket Descriptor Not Valid!\n"); |
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free(auth); |
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return -1; |
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} else if (errno == EIO) { |
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|
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fprintf(stderr, "I/O Error!\n"); |
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free(auth); |
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|
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return -1; |
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} else if (errno == EINTR) { |
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|
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fprintf(stderr, "Signal Interrupted The write() Function\n"); |
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free(auth); |
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return -1; |
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} |
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|
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} else { |
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|
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if (errno == EBADF) { |
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free(auth); |
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return -1; |
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} else if (errno == EIO) { |
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free(auth); |
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|
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return -1; |
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} else if (errno == EINTR) { |
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free(auth); |
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return -1; |
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} |
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|
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} |
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|
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free(auth); |
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|
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return -1; |
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|
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} |
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|
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free(auth); |
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|
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buf[1023] = '\0'; |
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|
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struct timeval tm; //tv_sec - tv_usec |
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fd_set readfds; |
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tm.tv_sec = 3; |
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tm.tv_usec = 0; |
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|
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FD_ZERO(&readfds); |
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|
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FD_SET(sck, &readfds); |
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sleep(1); //wait a little bit |
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|
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if (select(sck+1, &readfds, NULL, NULL, &tm) < 0 ) { |
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if (verbose) { |
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perror("select()"); |
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} |
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return -1; |
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} else { |
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|
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if (FD_ISSET(sck, &readfds)) { |
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|
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if ( (n = recv(sck, buf, 1022, 0)) < 0) { |
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if (verbose) { |
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perror("recv()"); |
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} |
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return -1; |
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} |
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|
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if (verbose) |
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printf("[Server] %s\n", buf); |
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|
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} |
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else { |
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if (verbose) |
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printf("[-] Timeout\n"); |
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|
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return -1; |
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} |
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} |
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|
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buf[n] = '\0'; |
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|
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if (ftp_login_handler(buf, 0) != 2) { //2? Yes.. Need a Password |
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return -1; |
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} |
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|
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memset(buf, 0x0, 1024); |
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|
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if (strlen(pwd) > 50) { |
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|
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return PWD_TOO_LONG; |
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|
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} |
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|
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auth = malloc(strlen("PASS ")+strlen(pwd)+2); |
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|
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sprintf(auth, "%s %s\n", "PASS", pwd); |
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|
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if (write(sck, auth, strlen(auth)) == -1) { |
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|
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if (verbose) { |
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if (errno == EBADF) { |
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fprintf(stderr, "Socket Descriptor Not Valid!\n"); |
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free(auth); |
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|
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return -1; |
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|
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} else if (errno == EIO) { |
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|
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fprintf(stderr, "I/O Error!\n"); |
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free(auth); |
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|
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return -1; |
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|
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} else if (errno == EINTR) { |
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|
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fprintf(stderr, "Signal Interrupted The write() Function\n"); |
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free(auth); |
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|
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return -1; |
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} |
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|
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} else { |
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|
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if (errno == EBADF) { |
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free(auth); |
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|
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return -1; |
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|
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} else if (errno == EIO) { |
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free(auth); |
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|
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return -1; |
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|
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} else if (errno == EINTR) { |
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free(auth); |
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|
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return -1; |
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} |
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|
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} |
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|
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free(auth); |
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|
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return -1; |
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|
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} |
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|
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pwd_len = strlen(pwd) - 1; |
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|
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free(auth); |
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|
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|
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FD_ZERO(&readfds); |
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|
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FD_SET(sck, &readfds); |
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|
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sleep(1); |
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|
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if (select(sck+1, &readfds, NULL, NULL, &tm) < 0 ) { |
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if (verbose) { |
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perror("select()"); |
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} |
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return -1; |
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} else { |
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|
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if (FD_ISSET(sck, &readfds)) { |
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|
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if ( (n= recv(sck, buf, 1022, 0)) < 0) { |
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if (verbose) { |
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perror("recv()"); |
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} |
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return -1; |
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} |
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|
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if (verbose) |
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printf("[Server] %s\n", buf); |
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|
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} |
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else { |
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if (verbose) |
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printf("[-] Timeout\n"); |
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|
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return -1; |
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} |
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} |
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|
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buf[n] = '\0'; |
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|
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if (ftp_login_handler(buf, 0) != 0) { |
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|
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return -1; |
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} |
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|
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memset(buf, 0x0, 1024); |
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|
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return 0; |
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|
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} |
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