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/* ftpget.c - Fetch file(s) from ftp server
*
* Copyright 2016 Rob Landley <rob@landley.net>
*
* No standard for the command, but see https://www.ietf.org/rfc/rfc959.txt
* TODO: local can be -
* TEST: -g -s (when local and remote exist) -gc, -sc
* zero length file
USE_FTPGET(NEWTOY(ftpget, "<2>3P:cp:u:vgslLmMdD[-gs][!gslLmMdD]", TOYFLAG_USR|TOYFLAG_BIN))
USE_FTPPUT(OLDTOY(ftpput, ftpget, TOYFLAG_USR|TOYFLAG_BIN))
config FTPGET
bool "ftpget"
default y
help
usage: ftpget [-cvgslLmMdD] [-P PORT] [-p PASSWORD] [-u USER] HOST [LOCAL] REMOTE
Talk to ftp server. By default get REMOTE file via passive anonymous
transfer, optionally saving under a LOCAL name. Can also send, list, etc.
-c Continue partial transfer
-p Use PORT instead of "21"
-P Use PASSWORD instead of "ftpget@"
-u Use USER instead of "anonymous"
-v Verbose
Ways to interact with FTP server:
-d Delete file
-D Remove directory
-g Get file (default)
-l List directory
-L List (filenames only)
-m Move file on server from LOCAL to REMOTE
-M mkdir
-s Send file
config FTPPUT
bool "ftpput"
default y
help
An ftpget that defaults to -s instead of -g
*/
#define FOR_ftpget
#include "toys.h"
GLOBALS(
char *user;
char *port;
char *password;
)
// we should get one line of data, but it may be in multiple chunks
int xread2line(int fd, char *buf, int len)
{
int i, total = 0;
len--;
while (total<len && (i = xread(fd, buf, len-total))) {
total += i;
if (buf[total-1] == '\n') break;
}
if (total>=len) error_exit("overflow");
while (total--)
if (buf[total]=='\r' || buf[total]=='\n') buf[total] = 0;
else break;
if (toys.optflags & FLAG_v) fprintf(stderr, "%s\n", toybuf);
return total+1;
}
static int ftp_check(int fd)
{
int rc;
xread2line(fd, toybuf, sizeof(toybuf));
if (!sscanf(toybuf, "%d", &rc)) error_exit_raw(toybuf);
return rc;
}
void ftpget_main(void)
{
struct sockaddr_in6 si6;
int fd, rc, i, port;
socklen_t sl = sizeof(si6);
char *s, *remote = toys.optargs[2];
unsigned long long lenl, lenr;
if (!(toys.optflags&(FLAG_v-1)))
toys.optflags |= (toys.which->name[3]=='g') ? FLAG_g : FLAG_s;
if (!TT.user) TT.user = "anonymous";
if (!TT.password) TT.password = "ftpget@";
if (!TT.port) TT.port = "21";
if (!remote) remote = toys.optargs[1];
// connect
fd = xconnect(*toys.optargs, TT.port, 0, SOCK_STREAM, 0, AI_ADDRCONFIG);
if (getpeername(fd, (void *)&si6, &sl)) perror_exit("getpeername");
// Login
if (ftp_check(fd) != 220) error_exit_raw(toybuf);
dprintf(fd, "USER %s\r\n", TT.user);
rc = ftp_check(fd);
if (rc == 331) {
dprintf(fd, "PASS %s\r\n", TT.password);
rc = ftp_check(fd);
}
if (rc != 230) error_exit_raw(toybuf);
// Only do passive binary transfers
dprintf(fd, "TYPE I\r\n");
ftp_check(fd);
dprintf(fd, "PASV\r\n");
// PASV means the server opens a port you connect to instead of the server
// dialing back to the client. (Still insane, but less so.) So we need port #
// PASV output is "227 PASV ok (x,x,x,x,p1,p2)" where x,x,x,x is the IP addr
// (must match the server you're talking to???) and port is (256*p1)+p2
s = 0;
if (ftp_check(fd) == 227) for (s = toybuf; (s = strchr(s, ',')); s++) {
int p1, got = 0;
sscanf(s, ",%u,%u)%n", &p1, &port, &got);
if (!got) continue;
port += 256*p1;
break;
}
if (!s || port<1 || port>65535) error_exit_raw(toybuf);
si6.sin6_port = SWAP_BE16(port); // same field size/offset for v4 and v6
port = xsocket(si6.sin6_family, SOCK_STREAM, 0);
if (connect(port, (void *)&si6, sizeof(si6))) perror_exit("connect");
if (toys.optflags & (FLAG_s|FLAG_g)) {
int get = toys.optflags&FLAG_g, cnt = toys.optflags&FLAG_c;
// RETR blocks until file data read from data port, so use SIZE to check
// if file exists before creating local copy
lenr = 0;
dprintf(fd, "SIZE %s\r\n", remote);
if (ftp_check(fd) == 213) sscanf(toybuf, "%*u %llu", &lenr);
else if (get) error_exit("no %s", remote);
// Open file for reading or writing
i = xcreate(toys.optargs[1],
get ? (cnt ? O_APPEND : O_TRUNC)|O_CREAT|O_WRONLY : O_RDONLY, 0666);
lenl = fdlength(i);
if (get) {
if (cnt) {
if (lenl>=lenr) goto done;
dprintf(fd, "REST %llu\r\n", lenl);
if (ftp_check(fd) != 350) error_exit_raw(toybuf);
} else lenl = 0;
dprintf(fd, "RETR %s\r\n", remote);
lenl += xsendfile(port, i);
if (ftp_check(fd) != 226) error_exit_raw(toybuf);
if (lenl != lenr) error_exit("short read");
} else if (toys.optflags & FLAG_s) {
char *send = "STOR";
if (cnt && lenr) {
send = "APPE";
xlseek(i, lenl, SEEK_SET);
} else lenr = 0;
dprintf(fd, "%s %s\r\n", send, remote);
if (ftp_check(fd) != 150) error_exit_raw(toybuf);
lenr += xsendfile(i, port);
if (lenl != lenr) error_exit("short write %lld %lld", lenl, lenr);
close(port);
}
}
dprintf(fd, "QUIT\r\n");
ftp_check(fd);
// gslLmMdD
// STOR - upload
// APPE - append
// REST - must immediately precede RETR or STOR
// LIST - list directory contents
// NLST - just list names, one per line
// RNFR RNTO - rename from, rename to
// DELE - delete
// RMD - rmdir
// MKD - mkdir
done:
if (CFG_TOYBOX_FREE) {
xclose(i);
xclose(port);
xclose(fd);
}
}
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