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ftp: code shrink

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This commit is contained in:
Denis Vlasenko 2009-03-09 04:13:59 +00:00
parent 9e95920efd
commit f1a11b5a4e
1 changed files with 119 additions and 132 deletions
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251
networking/ftpd.c
View File

@ -17,49 +17,52 @@
#include <syslog.h>
#include <netinet/tcp.h>
#define FTP_DATACONN 150
#define FTP_NOOPOK 200
#define FTP_TYPEOK 200
#define FTP_PORTOK 200
#define FTP_STRUOK 200
#define FTP_MODEOK 200
#define FTP_ALLOOK 202
#define FTP_STATOK 211
#define FTP_STATFILE_OK 213
#define FTP_HELP 214
#define FTP_SYSTOK 215
#define FTP_GREET 220
#define FTP_GOODBYE 221
#define FTP_TRANSFEROK 226
#define FTP_PASVOK 227
#define FTP_LOGINOK 230
#define FTP_CWDOK 250
#define FTP_RMDIROK 250
#define FTP_DELEOK 250
#define FTP_RENAMEOK 250
#define FTP_PWDOK 257
#define FTP_MKDIROK 257
#define FTP_GIVEPWORD 331
#define FTP_RESTOK 350
#define FTP_RNFROK 350
#define FTP_BADSENDCONN 425
#define FTP_BADSENDNET 426
#define FTP_BADSENDFILE 451
#define FTP_BADCMD 500
#define FTP_COMMANDNOTIMPL 502
#define FTP_NEEDUSER 503
#define FTP_NEEDRNFR 503
#define FTP_BADSTRU 504
#define FTP_BADMODE 504
#define FTP_LOGINERR 530
#define FTP_FILEFAIL 550
#define FTP_NOPERM 550
#define FTP_UPLOADFAIL 553
#define STR1(s) #s
#define STR(s) STR1(s)
enum {
OPT_v = (1 << 0),
OPT_w = (1 << 1),
FTP_DATACONN = 150,
FTP_NOOPOK = 200,
FTP_TYPEOK = 200,
FTP_PORTOK = 200,
FTP_STRUOK = 200,
FTP_MODEOK = 200,
FTP_ALLOOK = 202,
FTP_STATOK = 211,
FTP_STATFILE_OK = 213,
FTP_HELP = 214,
FTP_SYSTOK = 215,
FTP_GREET = 220,
FTP_GOODBYE = 221,
FTP_TRANSFEROK = 226,
FTP_PASVOK = 227,
FTP_LOGINOK = 230,
FTP_CWDOK = 250,
FTP_RMDIROK = 250,
FTP_DELEOK = 250,
FTP_RENAMEOK = 250,
FTP_PWDOK = 257,
FTP_MKDIROK = 257,
FTP_GIVEPWORD = 331,
FTP_RESTOK = 350,
FTP_RNFROK = 350,
FTP_BADSENDCONN = 425,
FTP_BADSENDNET = 426,
FTP_BADSENDFILE = 451,
FTP_BADCMD = 500,
FTP_COMMANDNOTIMPL = 502,
FTP_NEEDUSER = 503,
FTP_NEEDRNFR = 503,
FTP_BADSTRU = 504,
FTP_BADMODE = 504,
FTP_LOGINERR = 530,
FTP_FILEFAIL = 550,
FTP_NOPERM = 550,
FTP_UPLOADFAIL = 553,
#define mk_const4(a,b,c,d) (((a * 0x100 + b) * 0x100 + c) * 0x100 + d)
#define mk_const3(a,b,c) ((a * 0x100 + b) * 0x100 + c)
const_ALLO = mk_const4('A', 'L', 'L', 'O'),
@ -158,7 +161,7 @@ replace_char(char *str, char from, char to)
}
static void
ftp_write_str_common(unsigned status, const char *str, char sep)
cmdio_write(unsigned status, const char *str)
{
char *escaped_str, *response;
int len;
@ -167,7 +170,7 @@ ftp_write_str_common(unsigned status, const char *str, char sep)
* In telnet, 0xff is an escape char, and needs to be escaped: */
escaped_str = replace_text(str, '\xff', "\xff\xff");
response = xasprintf("%u%c%s\r", status, sep, escaped_str);
response = xasprintf("%u%s\r", status, escaped_str);
free(escaped_str);
/* ?! does FTP send embedded LFs as NULs? wow */
@ -175,32 +178,27 @@ ftp_write_str_common(unsigned status, const char *str, char sep)
replace_char(response, '\n', '\0');
response[len++] = '\n'; /* tack on trailing '\n' */
xwrite(STDIN_FILENO, response, len);
xwrite(STDOUT_FILENO, response, len);
free(response);
}
static void
cmdio_write(int status, const char *p_text)
{
ftp_write_str_common(status, p_text, ' ');
}
static void
cmdio_write_ok(int status)
{
ftp_write_str_common(status, "Operation successful", ' ');
fdprintf(STDOUT_FILENO, "%u Operation successful\r\n", status);
}
/* TODO: output strerr(errno) if errno != 0? */
static void
cmdio_write_hyphen(int status, const char *p_text)
cmdio_write_error(int status)
{
ftp_write_str_common(status, p_text, '-');
fdprintf(STDOUT_FILENO, "%u Error\r\n", status);
}
static void
cmdio_write_raw(const char *p_text)
{
xwrite_str(STDIN_FILENO, p_text);
xwrite_str(STDOUT_FILENO, p_text);
}
/* Simple commands */
@ -217,7 +215,7 @@ handle_pwd(void)
/* We have to promote each " to "" */
promoted_cwd = replace_text(cwd, '\"', "\"\"");
free(cwd);
response = xasprintf("\"%s\"", promoted_cwd);
response = xasprintf(" \"%s\"", promoted_cwd);
free(promoted_cwd);
cmdio_write(FTP_PWDOK, response);
free(response);
@ -227,7 +225,7 @@ static void
handle_cwd(void)
{
if (!G.ftp_arg || chdir(G.ftp_arg) != 0) {
cmdio_write(FTP_FILEFAIL, "Can't change directory");
cmdio_write_error(FTP_FILEFAIL);
return;
}
cmdio_write_ok(FTP_CWDOK);
@ -240,41 +238,40 @@ handle_cdup(void)
handle_cwd();
}
static void
handle_type(void)
{
if (G.ftp_arg
&& ( ((G.ftp_arg[0] | 0x20) == 'i' && G.ftp_arg[1] == '\0')
|| !strcasecmp(G.ftp_arg, "L8")
|| !strcasecmp(G.ftp_arg, "L 8")
)
) {
cmdio_write_ok(FTP_TYPEOK);
} else {
cmdio_write(FTP_BADCMD, "Unrecognised TYPE command");
}
}
//static void
//handle_type(void)
//{
// if (G.ftp_arg
// && ( ((G.ftp_arg[0] | 0x20) == 'i' && G.ftp_arg[1] == '\0')
// || !strcasecmp(G.ftp_arg, "L8")
// || !strcasecmp(G.ftp_arg, "L 8")
// )
// ) {
// cmdio_write_ok(FTP_TYPEOK);
// } else {
// cmdio_write_error(FTP_BADCMD);
// }
//}
static void
handle_stat(void)
{
cmdio_write_hyphen(FTP_STATOK, "FTP server status:");
cmdio_write_raw(" TYPE: BINARY\r\n");
cmdio_write_ok(FTP_STATOK);
cmdio_write_raw(STR(FTP_STATOK)"-FTP server status:\r\n"
"TYPE: BINARY\r\n"
STR(FTP_STATOK)" Ok\r\n");
}
static void
handle_help(void)
{
cmdio_write_hyphen(FTP_HELP, "Recognized commands:");
cmdio_write_raw(" ALLO CDUP CWD HELP LIST\r\n"
" MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
" REST RETR STAT STRU SYST TYPE USER\r\n"
cmdio_write_raw(STR(FTP_HELP)"-Commands:\r\n"
"ALLO CDUP CWD HELP LIST\r\n"
"MODE NLST NOOP PASS PASV PORT PWD QUIT\r\n"
"REST RETR STAT STRU SYST TYPE USER\r\n"
#if ENABLE_FEATURE_FTP_WRITE
" APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
"APPE DELE MKD RMD RNFR RNTO STOR STOU\r\n"
#endif
);
cmdio_write(FTP_HELP, "Help OK");
STR(FTP_HELP)" Ok\r\n");
}
/* Download commands */
@ -302,7 +299,7 @@ ftpdataio_get_pasv_fd(void)
remote_fd = accept(G.pasv_listen_fd, NULL, 0);
if (remote_fd < 0) {
cmdio_write(FTP_BADSENDCONN, "Can't establish connection");
cmdio_write_error(FTP_BADSENDCONN);
return remote_fd;
}
@ -372,7 +369,7 @@ static int
data_transfer_checks_ok(void)
{
if (!pasv_active() && !port_active()) {
cmdio_write(FTP_BADSENDCONN, "Use PORT or PASV first");
cmdio_write_raw(STR(FTP_BADSENDCONN)" Use PORT or PASV first\r\n");
return 0;
}
@ -425,7 +422,7 @@ handle_pasv(void)
addr = xmalloc_sockaddr2dotted_noport(&G.local_addr->u.sa);
replace_char(addr, '.', ',');
response = xasprintf("Entering Passive Mode (%s,%u,%u)",
response = xasprintf(" Entering Passive Mode (%s,%u,%u)",
addr, (int)(port >> 8), (int)(port & 255));
free(addr);
@ -466,7 +463,7 @@ handle_port(void)
if (lsa == NULL) {
bail:
cmdio_write(FTP_BADCMD, "Illegal PORT command");
cmdio_write_error(FTP_BADCMD);
return;
}
@ -500,14 +497,14 @@ handle_retr(void)
/* O_NONBLOCK is useful if file happens to be a device node */
opened_file = G.ftp_arg ? open(G.ftp_arg, O_RDONLY | O_NONBLOCK) : -1;
if (opened_file < 0) {
cmdio_write(FTP_FILEFAIL, "Can't open file");
cmdio_write_error(FTP_FILEFAIL);
return;
}
retval = fstat(opened_file, &statbuf);
if (retval < 0 || !S_ISREG(statbuf.st_mode)) {
/* Note - pretend open failed */
cmdio_write(FTP_FILEFAIL, "Can't open file");
cmdio_write_error(FTP_FILEFAIL);
goto file_close_out;
}
@ -521,7 +518,7 @@ handle_retr(void)
xlseek(opened_file, offset, SEEK_SET);
response = xasprintf(
"Opening BINARY mode data connection for %s (%"OFF_FMT"u bytes)",
" Opening BINARY mode data connection for %s (%"OFF_FMT"u bytes)",
G.ftp_arg, statbuf.st_size);
remote_fd = get_remote_transfer_fd(response);
free(response);
@ -531,7 +528,7 @@ handle_retr(void)
trans_ret = bb_copyfd_eof(opened_file, remote_fd);
ftpdataio_dispose_transfer_fd();
if (trans_ret < 0)
cmdio_write(FTP_BADSENDFILE, "Error sending local file");
cmdio_write_error(FTP_BADSENDFILE);
else
cmdio_write_ok(FTP_TRANSFEROK);
@ -681,9 +678,9 @@ handle_dir_common(int full_details, int stat_cmd)
if (stat_cmd) {
fd = STDIN_FILENO;
cmdio_write_hyphen(FTP_STATFILE_OK, "Status follows:");
cmdio_write_raw(STR(FTP_STATFILE_OK)"-Status follows:\r\n");
} else {
fd = get_remote_transfer_fd("Here comes the directory listing");
fd = get_remote_transfer_fd(" Here comes the directory listing");
if (fd < 0)
goto bail;
}
@ -735,7 +732,7 @@ static void
handle_mkd(void)
{
if (!G.ftp_arg || mkdir(G.ftp_arg, 0777) != 0) {
cmdio_write(FTP_FILEFAIL, "Create directory operation failed");
cmdio_write_error(FTP_FILEFAIL);
return;
}
cmdio_write_ok(FTP_MKDIROK);
@ -745,7 +742,7 @@ static void
handle_rmd(void)
{
if (!G.ftp_arg || rmdir(G.ftp_arg) != 0) {
cmdio_write(FTP_FILEFAIL, "Deletion failed");
cmdio_write_error(FTP_FILEFAIL);
return;
}
cmdio_write_ok(FTP_RMDIROK);
@ -755,7 +752,7 @@ static void
handle_dele(void)
{
if (!G.ftp_arg || unlink(G.ftp_arg) != 0) {
cmdio_write(FTP_FILEFAIL, "Deletion failed");
cmdio_write_error(FTP_FILEFAIL);
return;
}
cmdio_write_ok(FTP_DELEOK);
@ -764,19 +761,7 @@ handle_dele(void)
static void
handle_rnfr(void)
{
struct stat statbuf;
/* Clear old value */
free(G.rnfr_filename);
G.rnfr_filename = NULL;
if (!G.ftp_arg
|| stat(G.ftp_arg, &statbuf) != 0
/* || it isn't a regular file or a directory? */
) {
cmdio_write(FTP_FILEFAIL, "RNFR command failed");
return;
}
G.rnfr_filename = xstrdup(G.ftp_arg);
cmdio_write_ok(FTP_RNFROK);
}
@ -788,7 +773,7 @@ handle_rnto(void)
/* If we didn't get a RNFR, throw a wobbly */
if (G.rnfr_filename == NULL || G.ftp_arg == NULL) {
cmdio_write(FTP_NEEDRNFR, "RNFR required first");
cmdio_write_raw(STR(FTP_NEEDRNFR)" RNFR required first\r\n");
return;
}
@ -797,7 +782,7 @@ handle_rnto(void)
G.rnfr_filename = NULL;
if (retval) {
cmdio_write(FTP_FILEFAIL, "Rename failed");
cmdio_write_error(FTP_FILEFAIL);
return;
}
cmdio_write_ok(FTP_RENAMEOK);
@ -820,8 +805,8 @@ handle_upload_common(int is_append, int is_unique)
local_file_fd = -1;
if (is_unique) {
tempname = xstrdup("FILE: uniq.XXXXXX");
local_file_fd = mkstemp(tempname + 6);
tempname = xstrdup(" FILE: uniq.XXXXXX");
local_file_fd = mkstemp(tempname + 7);
} else if (G.ftp_arg) {
int flags = O_WRONLY | O_CREAT | O_TRUNC;
if (is_append)
@ -831,7 +816,7 @@ handle_upload_common(int is_append, int is_unique)
local_file_fd = open(G.ftp_arg, flags, 0666);
}
if (local_file_fd < 0) {
cmdio_write(FTP_UPLOADFAIL, "Can't create file");
cmdio_write_error(FTP_UPLOADFAIL);
return;
}
@ -840,7 +825,7 @@ handle_upload_common(int is_append, int is_unique)
if (offset)
xlseek(local_file_fd, offset, SEEK_SET);
remote_fd = get_remote_transfer_fd(tempname ? tempname : "Ok to send data");
remote_fd = get_remote_transfer_fd(tempname ? tempname : " Ok to send data");
free(tempname);
if (remote_fd < 0)
@ -850,7 +835,7 @@ handle_upload_common(int is_append, int is_unique)
ftpdataio_dispose_transfer_fd();
if (trans_ret < 0)
cmdio_write(FTP_BADSENDFILE, "Failure writing to local file");
cmdio_write_error(FTP_BADSENDFILE);
else
cmdio_write_ok(FTP_TRANSFEROK);
@ -949,7 +934,7 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
setsockopt(STDIN_FILENO, SOL_SOCKET, SO_OOBINLINE, &const_int_1, sizeof(const_int_1));
cmdio_write(FTP_GREET, "Welcome");
cmdio_write_raw(STR(FTP_GREET)" Welcome\r\n");
#ifdef IF_WE_WANT_TO_REQUIRE_LOGIN
{
@ -959,20 +944,20 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
if (cmdval == const_USER) {
if (G.ftp_arg == NULL || strcasecmp(G.ftp_arg, "anonymous") != 0)
cmdio_write(FTP_LOGINERR, "Server is anonymous only");
cmdio_write_raw(STR(FTP_LOGINERR)" Server is anonymous only\r\n");
else {
user_was_specified = 1;
cmdio_write(FTP_GIVEPWORD, "Please specify the password");
cmdio_write_raw(STR(FTP_GIVEPWORD)" Please specify the password\r\n");
}
} else if (cmdval == const_PASS) {
if (user_was_specified)
break;
cmdio_write(FTP_NEEDUSER, "Login with USER");
cmdio_write_raw(STR(FTP_NEEDUSER)" Login with USER\r\n");
} else if (cmdval == const_QUIT) {
cmdio_write(FTP_GOODBYE, "Goodbye");
cmdio_write_raw(STR(FTP_GOODBYE)" Goodbye\r\n");
return 0;
} else {
cmdio_write(FTP_LOGINERR, "Login with USER and PASS");
cmdio_write_raw(STR(FTP_LOGINERR)" Login with USER and PASS\r\n");
}
}
}
@ -1021,7 +1006,7 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
uint32_t cmdval = cmdio_get_cmd_and_arg();
if (cmdval == const_QUIT) {
cmdio_write(FTP_GOODBYE, "Goodbye");
cmdio_write_raw(STR(FTP_GOODBYE)" Goodbye\r\n");
return 0;
}
if (cmdval == const_PWD)
@ -1037,13 +1022,14 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
else if (cmdval == const_NOOP)
cmdio_write_ok(FTP_NOOPOK);
else if (cmdval == const_SYST)
cmdio_write(FTP_SYSTOK, "UNIX Type: L8");
cmdio_write_raw(STR(FTP_SYSTOK)" UNIX Type: L8\r\n");
else if (cmdval == const_HELP)
handle_help();
else if (cmdval == const_LIST) /* ls -l */
handle_list();
else if (cmdval == const_TYPE)
handle_type();
//handle_type();
cmdio_write_ok(FTP_TYPEOK);
else if (cmdval == const_PORT)
handle_port();
else if (cmdval == const_REST)
@ -1055,20 +1041,20 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
// && (G.ftp_arg[0] | 0x20) == 'f'
// && G.ftp_arg[1] == '\0'
//) {
cmdio_write(FTP_STRUOK, "Command ignored");
cmdio_write_ok(FTP_STRUOK);
//} else
// cmdio_write(FTP_BADSTRU, "Bad STRU command");
// cmdio_write_raw(STR(FTP_BADSTRU)" Bad STRU command\r\n");
} else if (cmdval == const_MODE) {
//if (G.ftp_arg
// && (G.ftp_arg[0] | 0x20) == 's'
// && G.ftp_arg[1] == '\0'
//) {
cmdio_write(FTP_MODEOK, "Command ignored");
cmdio_write_ok(FTP_MODEOK);
//} else
// cmdio_write(FTP_BADMODE, "Bad MODE command");
// cmdio_write_raw(STR(FTP_BADMODE)" Bad MODE command\r\n");
}
else if (cmdval == const_ALLO)
cmdio_write(FTP_ALLOOK, "Command ignored");
cmdio_write_ok(FTP_ALLOOK);
else if (cmdval == const_STAT) {
if (G.ftp_arg == NULL)
handle_stat();
@ -1076,10 +1062,10 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
handle_stat_file();
} else if (cmdval == const_USER) {
/* FTP_LOGINERR confuses clients: */
/* cmdio_write(FTP_LOGINERR, "Can't change to another user"); */
cmdio_write(FTP_GIVEPWORD, "Command ignored");
/* cmdio_write_raw(STR(FTP_LOGINERR)" Can't change to another user\r\n"); */
cmdio_write_ok(FTP_GIVEPWORD);
} else if (cmdval == const_PASS)
cmdio_write(FTP_LOGINOK, "Command ignored");
cmdio_write_ok(FTP_LOGINOK);
#if ENABLE_FEATURE_FTP_WRITE
else if (G.opts & OPT_w) {
if (cmdval == const_STOR)
@ -1110,17 +1096,18 @@ int ftpd_main(int argc UNUSED_PARAM, char **argv)
|| cmdval == const_APPE
|| cmdval == const_STOU
) {
cmdio_write(FTP_NOPERM, "Permission denied");
cmdio_write_raw(STR(FTP_NOPERM)" Permission denied\r\n");
}
#endif
else {
/* Which unsupported commands were seen in the wild?
* (doesn't necessarily mean "we must support them")
* wget 1.11.4: SIZE - todo.
* lftp 3.6.3: MDTM - works fine without it anyway.
* IPv6-style PASV: "EPSV 2"
* wget 1.11.4: SIZE - todo
* lftp 3.6.3: FEAT - is it useful?
* MDTM - works fine without it anyway
* IPv6-style PASV: "EPSV 2" - todo
*/
cmdio_write(FTP_BADCMD, "Unknown command");
cmdio_write_raw(STR(FTP_BADCMD)" Unknown command\r\n");
}
}
}