729 lines
15 KiB
C
729 lines
15 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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* Major Changelog:
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*
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* Jordan K. Hubbard
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* 17 Jan 1996
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*
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* Turned inside out. Now returns xfers as new file ids, not as a special
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* `state' of FTP_t
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*
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* $Id: ftpio.c,v 1.6 1996/06/17 23:16:04 jkh Exp $
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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 <sys/socket.h>
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#include <netinet/in.h>
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#include <stdarg.h>
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#include <string.h>
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#include <ctype.h>
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#include <sys/signal.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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#include <ftpio.h>
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#define SUCCESS 0
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#define FAILURE -1
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#ifndef TRUE
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#define TRUE (1)
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#define FALSE (0)
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#endif
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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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/* Internal routines - deal only with internal FTP_t type */
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static FTP_t ftp_new(void);
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static void check_passive(FILE *fp);
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static int ftp_read_method(void *n, char *buf, int nbytes);
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static int ftp_write_method(void *n, const char *buf, int nbytes);
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static int ftp_close_method(void *n);
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static int writes(int fd, char *s);
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static __inline char *get_a_line(FTP_t ftp);
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static int get_a_number(FTP_t ftp, char **q);
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static int botch(char *func, char *botch_state);
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static int cmd(FTP_t ftp, const char *fmt, ...);
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static int ftp_login_session(FTP_t ftp, char *host, char *user, char *passwd, int port);
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static int ftp_file_op(FTP_t ftp, char *operation, char *file, FILE **fp, char *mode, int *seekto);
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static int ftp_close(FTP_t ftp);
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static int get_url_info(char *url_in, char *host_ret, int *port_ret, char *name_ret);
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/* Global status variable - ick */
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int FtpTimedOut;
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/* FTP status codes */
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#define FTP_ASCII_HAPPY 200
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#define FTP_BINARY_HAPPY 200
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#define FTP_PORT_HAPPY 200
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#define FTP_QUIT_HAPPY 221
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#define FTP_TRANSFER_HAPPY 226
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#define FTP_PASSIVE_HAPPY 227
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#define FTP_CHDIR_HAPPY 250
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/*
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* XXX
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* gross! evil! bad! We really need an access primitive for cookie in stdio itself.
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* it's too convenient a hook to bury and it's already exported through funopen as it is, so...
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* XXX
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*/
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#define fcookie(fp) ((fp)->_cookie)
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/* Placeholder in case we want to do any pre-init stuff at some point */
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int
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networkInit()
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{
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return SUCCESS; /* XXX dummy function for now XXX */
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}
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/* Check a return code with some lenience for back-dated garbage that might be in the buffer */
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static int
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check_code(FTP_t ftp, int var, int preferred)
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{
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ftp->errno = 0;
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while (1) {
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if (var == preferred)
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return 0;
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else if (var == 226) /* last operation succeeded */
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var = get_a_number(ftp, NULL);
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else if (var == 220) /* chit-chat */
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var = get_a_number(ftp, NULL);
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else if (var == 200) /* success codes */
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var = get_a_number(ftp, NULL);
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else {
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ftp->errno = var;
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return 1;
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}
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}
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}
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int
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ftpAscii(FILE *fp)
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{
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FTP_t ftp = fcookie(fp);
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int i;
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if (!ftp->is_binary)
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return SUCCESS;
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i = cmd(ftp, "TYPE A");
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if (i < 0 || check_code(ftp, i, FTP_ASCII_HAPPY))
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return i;
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ftp->is_binary = FALSE;
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return SUCCESS;
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}
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int
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ftpBinary(FILE *fp)
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{
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FTP_t ftp = fcookie(fp);
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int i;
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if (ftp->is_binary)
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return SUCCESS;
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i = cmd(ftp, "TYPE I");
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if (i < 0 || check_code(ftp, i, FTP_BINARY_HAPPY))
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return i;
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ftp->is_binary = TRUE;
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return SUCCESS;
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}
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int
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ftpChdir(FILE *fp, char *dir)
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{
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int i;
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FTP_t ftp = fcookie(fp);
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i = cmd(ftp, "CWD %s", dir);
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if (i < 0 || check_code(ftp, i, FTP_CHDIR_HAPPY))
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return i;
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return SUCCESS;
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}
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int
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ftpErrno(FILE *fp)
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{
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FTP_t ftp = fcookie(fp);
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return ftp->errno;
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}
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size_t
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ftpGetSize(FILE *fp, char *name)
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{
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int i;
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char p[BUFSIZ], *cp;
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FTP_t ftp = fcookie(fp);
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check_passive(fp);
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sprintf(p, "SIZE %s\r\n", name);
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i = writes(ftp->fd_ctrl, p);
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if (i)
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return (size_t)-1;
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i = get_a_number(ftp, &cp);
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if (check_code(ftp, i, 213))
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return (size_t)-1;
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return (size_t)atoi(cp);
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}
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time_t
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ftpGetModtime(FILE *fp, char *name)
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{
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char p[BUFSIZ], *cp;
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struct tm t;
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time_t t0 = time (0);
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FTP_t ftp = fcookie(fp);
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int i;
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check_passive(fp);
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sprintf(p, "MDTM %s\r\n", name);
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i = writes(ftp->fd_ctrl, p);
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if (i)
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return (time_t)0;
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i = get_a_number(ftp, &cp);
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if (check_code(ftp, i, 213))
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return (time_t)0;
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while (*cp && !isdigit(*cp))
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cp++;
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if (!*cp)
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return (time_t)0;
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t0 = localtime (&t0)->tm_gmtoff;
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sscanf(cp, "%04d%02d%02d%02d%02d%02d", &t.tm_year, &t.tm_mon, &t.tm_mday, &t.tm_hour, &t.tm_min, &t.tm_sec);
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t.tm_mon--;
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t.tm_year -= 1900;
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t.tm_isdst=-1;
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t.tm_gmtoff = 0;
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t0 += mktime (&t);
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return t0;
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}
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FILE *
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ftpGet(FILE *fp, char *file, int *seekto)
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{
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FILE *fp2;
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FTP_t ftp = fcookie(fp);
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check_passive(fp);
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if (ftpBinary(fp) != SUCCESS)
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return NULL;
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if (ftp_file_op(ftp, "RETR", file, &fp2, "r", seekto) == SUCCESS)
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return fp2;
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return NULL;
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}
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/* Returns a standard FILE pointer type representing an open control connection */
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FILE *
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ftpLogin(char *host, char *user, char *passwd, int port)
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{
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FTP_t n;
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FILE *fp;
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if (networkInit() != SUCCESS)
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return NULL;
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n = ftp_new();
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fp = NULL;
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if (n && ftp_login_session(n, host, user, passwd, port) == SUCCESS) {
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fp = funopen(n, ftp_read_method, ftp_write_method, NULL, ftp_close_method); /* BSD 4.4 function! */
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fp->_file = n->fd_ctrl;
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}
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return fp;
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}
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FILE *
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ftpPut(FILE *fp, char *file)
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{
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FILE *fp2;
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FTP_t ftp = fcookie(fp);
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check_passive(fp);
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if (ftp_file_op(ftp, "STOR", file, &fp2, "w", NULL) == SUCCESS)
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return fp2;
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return NULL;
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}
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/* Unlike binary mode, passive mode is a toggle! :-( */
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int
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ftpPassive(FILE *fp, int st)
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{
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FTP_t ftp = fcookie(fp);
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int i;
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if (ftp->is_passive == st)
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return SUCCESS;
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i = cmd(ftp, "PASSIVE");
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if (i < 0)
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return i;
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ftp->is_passive = !ftp->is_passive;
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return SUCCESS;
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}
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FILE *
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ftpGetURL(char *url, char *user, char *passwd)
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{
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char host[255], name[255];
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int port;
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static FILE *fp = NULL;
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FILE *fp2;
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if (fp) { /* Close previous managed connection */
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fclose(fp);
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fp = NULL;
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}
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if (get_url_info(url, host, &port, name) == SUCCESS) {
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fp = ftpLogin(host, user, passwd, port);
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if (fp) {
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fp2 = ftpGet(fp, name, NULL);
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return fp2;
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}
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}
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return NULL;
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}
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FILE *
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ftpPutURL(char *url, char *user, char *passwd)
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{
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char host[255], name[255];
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int port;
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static FILE *fp = NULL;
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FILE *fp2;
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if (fp) { /* Close previous managed connection */
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fclose(fp);
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fp = NULL;
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}
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if (get_url_info(url, host, &port, name) == SUCCESS) {
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fp = ftpLogin(host, user, passwd, port);
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if (fp) {
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fp2 = ftpPut(fp, name);
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return fp2;
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}
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}
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return NULL;
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}
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/* Internal workhorse function for dissecting URLs. Takes a URL as the first argument and returns the
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result of such disection in the host, user, passwd, port and name variables. */
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static int
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get_url_info(char *url_in, char *host_ret, int *port_ret, char *name_ret)
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{
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char *name, *host, *cp, url[BUFSIZ];
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int port;
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name = host = NULL;
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/* XXX add http:// here or somewhere reasonable at some point XXX */
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if (strncmp("ftp://", url_in, 6) != NULL)
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return FAILURE;
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/* We like to stomp a lot on the URL string in dissecting it, so copy it first */
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strncpy(url, url_in, BUFSIZ);
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host = url + 6;
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if ((cp = index(host, ':')) != NULL) {
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*(cp++) = '\0';
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port = strtol(cp, 0, 0);
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}
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else
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port = 0; /* use default */
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if (port_ret)
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*port_ret = port;
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if ((name = index(cp ? cp : host, '/')) != NULL)
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*(name++) = '\0';
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if (host_ret)
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strcpy(host_ret, host);
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if (name && name_ret)
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strcpy(name_ret, name);
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return SUCCESS;
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}
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static FTP_t
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ftp_new(void)
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{
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FTP_t ftp;
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ftp = (FTP_t)malloc(sizeof *ftp);
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if (!ftp)
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return NULL;
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memset(ftp, 0, sizeof *ftp);
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ftp->fd_ctrl = -1;
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ftp->con_state = init;
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ftp->is_binary = FALSE;
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ftp->is_passive = FALSE;
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ftp->errno = 0;
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return ftp;
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}
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static int
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ftp_read_method(void *vp, char *buf, int nbytes)
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{
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int i, fd;
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FTP_t n = (FTP_t)vp;
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fd = n->fd_ctrl;
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i = (fd >= 0) ? read(fd, buf, nbytes) : EOF;
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return i;
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}
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static int
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ftp_write_method(void *vp, const char *buf, int nbytes)
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{
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int i, fd;
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FTP_t n = (FTP_t)vp;
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fd = n->fd_ctrl;
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i = (fd >= 0) ? write(fd, buf, nbytes) : EOF;
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return i;
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}
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static int
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ftp_close_method(void *n)
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{
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int i;
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i = ftp_close((FTP_t)n);
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free(n);
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return i;
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}
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static void
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check_passive(FILE *fp)
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{
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if (getenv("FTP_PASSIVE_MODE"))
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ftpPassive(fp, TRUE);
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}
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static void
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ftp_timeout()
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{
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FtpTimedOut = TRUE;
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/* Debug("ftp_pkg: ftp_timeout called - operation timed out"); */
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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 n, i = strlen(s);
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/* Set the timer */
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FtpTimedOut = FALSE;
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signal(SIGALRM, ftp_timeout);
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alarm(120);
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/* Debug("ftp_pkg: writing \"%s\" to ftp connection %d", s, fd); */
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n = write(fd, s, i);
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alarm(0);
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if (i != n)
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return FAILURE;
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return SUCCESS;
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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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/* Set the timer */
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FtpTimedOut = FALSE;
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signal(SIGALRM, ftp_timeout);
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/* Debug("ftp_pkg: trying to read a line from %d", ftp->fd_ctrl); */
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for(i = 0; i < BUFSIZ;) {
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alarm(120);
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j = read(ftp->fd_ctrl, buf + i, 1);
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alarm(0);
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if (j != 1)
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return NULL;
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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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return buf;
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}
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i++;
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}
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/* Debug("ftp_pkg: read string \"%s\" from %d", buf, ftp->fd_ctrl); */
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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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ftp_close(ftp);
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return FAILURE;
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}
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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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/* Debug("ftp_pkg: read reply %d from server (%s)", j, p); */
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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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/* Debug("ftp_pkg: read reply %d from server (%s)", j, p); */
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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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ftp_close(FTP_t ftp)
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{
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int i;
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if (ftp->con_state == isopen) {
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/* Debug("ftp_pkg: in ftp_close(), sending QUIT"); */
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i = cmd(ftp, "QUIT");
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close(ftp->fd_ctrl);
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ftp->fd_ctrl = -1;
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ftp->con_state = init;
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if (check_code(ftp, i, FTP_QUIT_HAPPY)) {
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ftp->errno = i;
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return FAILURE;
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}
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/* Debug("ftp_pkg: ftp_close() - proper shutdown"); */
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return SUCCESS;
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}
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/* Debug("ftp_pkg: ftp_close() - improper shutdown"); */
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return FAILURE;
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}
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static int
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botch(char *func, char *botch_state)
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{
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/* Debug("ftp_pkg: botch: %s(%s)", func, botch_state); */
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return FAILURE;
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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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if (ftp->con_state != isopen)
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return botch("cmd", "open");
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strcat(p, "\r\n");
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i = writes(ftp->fd_ctrl, p);
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if (i)
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return FAILURE;
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while ((i = get_a_number(ftp, NULL)) == 220);
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return i;
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}
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static int
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ftp_login_session(FTP_t ftp, char *host, char *user, char *passwd, int port)
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{
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|
struct hostent *he = NULL;
|
|
struct sockaddr_in sin;
|
|
int s;
|
|
unsigned long temp;
|
|
int i;
|
|
|
|
if (networkInit() != SUCCESS)
|
|
return FAILURE;
|
|
|
|
if (ftp->con_state != init) {
|
|
ftp_close(ftp);
|
|
return FAILURE;
|
|
}
|
|
|
|
if (!user)
|
|
user = "ftp";
|
|
|
|
if (!passwd)
|
|
passwd = "setup@";
|
|
|
|
if (!port)
|
|
port = 21;
|
|
|
|
temp = inet_addr(host);
|
|
if (temp != INADDR_NONE) {
|
|
ftp->addrtype = sin.sin_family = AF_INET;
|
|
sin.sin_addr.s_addr = temp;
|
|
}
|
|
else {
|
|
he = gethostbyname(host);
|
|
if (!he)
|
|
return FAILURE;
|
|
ftp->addrtype = sin.sin_family = he->h_addrtype;
|
|
bcopy(he->h_addr, (char *)&sin.sin_addr, he->h_length);
|
|
}
|
|
|
|
sin.sin_port = htons(port);
|
|
|
|
if ((s = socket(ftp->addrtype, SOCK_STREAM, 0)) < 0)
|
|
return FAILURE;
|
|
|
|
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
|
|
(void)close(s);
|
|
return FAILURE;
|
|
}
|
|
|
|
ftp->fd_ctrl = s;
|
|
ftp->con_state = isopen;
|
|
|
|
i = cmd(ftp, "USER %s", user);
|
|
if (i >= 300 && i < 400)
|
|
i = cmd(ftp, "PASS %s", passwd);
|
|
if (i >= 299 || i < 0) {
|
|
ftp_close(ftp);
|
|
return FAILURE;
|
|
}
|
|
return SUCCESS;
|
|
}
|
|
|
|
static int
|
|
ftp_file_op(FTP_t ftp, char *operation, char *file, FILE **fp, char *mode, int *seekto)
|
|
{
|
|
int i,s;
|
|
char *q;
|
|
unsigned char addr[64];
|
|
struct sockaddr_in sin;
|
|
u_long a;
|
|
|
|
if (!fp)
|
|
return FAILURE;
|
|
*fp = NULL;
|
|
|
|
if (ftp->con_state != isopen)
|
|
return botch("ftp_file_op", "open");
|
|
|
|
if ((s = socket(ftp->addrtype, SOCK_STREAM, 0)) < 0)
|
|
return FAILURE;
|
|
|
|
if (ftp->is_passive) {
|
|
if (writes(ftp->fd_ctrl, "PASV\r\n")) {
|
|
ftp_close(ftp);
|
|
return FAILURE;
|
|
}
|
|
i = get_a_number(ftp, &q);
|
|
if (check_code(ftp, i, FTP_PASSIVE_HAPPY)) {
|
|
ftp_close(ftp);
|
|
return i;
|
|
}
|
|
while (*q && !isdigit(*q))
|
|
q++;
|
|
if (!*q) {
|
|
ftp_close(ftp);
|
|
return FAILURE;
|
|
}
|
|
q--;
|
|
for (i = 0; i < 6; i++) {
|
|
q++;
|
|
addr[i] = strtol(q, &q, 10);
|
|
}
|
|
|
|
sin.sin_family = ftp->addrtype;
|
|
bcopy(addr, (char *)&sin.sin_addr, 4);
|
|
bcopy(addr + 4, (char *)&sin.sin_port, 2);
|
|
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
|
|
(void)close(s);
|
|
return FAILURE;
|
|
}
|
|
if (seekto && *seekto) {
|
|
i = cmd(ftp, "RETR %d", *seekto);
|
|
if (i < 0 || FTP_TIMEOUT(i)) {
|
|
close(s);
|
|
ftp->errno = i;
|
|
return i;
|
|
}
|
|
else if (i != 350)
|
|
*seekto = 0;
|
|
}
|
|
i = cmd(ftp, "%s %s", operation, file);
|
|
if (i < 0 || i > 299) {
|
|
close(s);
|
|
ftp->errno = i;
|
|
return i;
|
|
}
|
|
*fp = fdopen(s, mode);
|
|
}
|
|
else {
|
|
int fd;
|
|
|
|
i = sizeof sin;
|
|
getsockname(ftp->fd_ctrl, (struct sockaddr *)&sin, &i);
|
|
sin.sin_port = 0;
|
|
i = sizeof sin;
|
|
if (bind(s, (struct sockaddr *)&sin, i) < 0) {
|
|
close (s);
|
|
return FAILURE;
|
|
}
|
|
getsockname(s,(struct sockaddr *)&sin,&i);
|
|
if (listen(s, 1) < 0) {
|
|
close(s);
|
|
return FAILURE;
|
|
}
|
|
a = ntohl(sin.sin_addr.s_addr);
|
|
i = cmd(ftp, "PORT %d,%d,%d,%d,%d,%d",
|
|
(a >> 24) & 0xff,
|
|
(a >> 16) & 0xff,
|
|
(a >> 8) & 0xff,
|
|
a & 0xff,
|
|
(ntohs(sin.sin_port) >> 8) & 0xff,
|
|
ntohs(sin.sin_port) & 0xff);
|
|
if (check_code(ftp, i, FTP_PORT_HAPPY)) {
|
|
close(s);
|
|
return i;
|
|
}
|
|
if (seekto && *seekto) {
|
|
i = cmd(ftp, "RETR %d", *seekto);
|
|
if (i < 0 || FTP_TIMEOUT(i)) {
|
|
close(s);
|
|
ftp->errno = i;
|
|
return i;
|
|
}
|
|
else if (i != 350)
|
|
*seekto = 0;
|
|
}
|
|
i = cmd(ftp, "%s %s", operation, file);
|
|
if (i < 0 || i > 299) {
|
|
close(s);
|
|
ftp->errno = i;
|
|
return FAILURE;
|
|
}
|
|
fd = accept(s, 0, 0);
|
|
if (fd < 0) {
|
|
close(s);
|
|
ftp->errno = 401;
|
|
return FAILURE;
|
|
}
|
|
close(s);
|
|
*fp = fdopen(fd, mode);
|
|
}
|
|
if (*fp)
|
|
return SUCCESS;
|
|
else
|
|
return FAILURE;
|
|
}
|