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Fernando Silveira writes:

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Hi,

  Well, I made this patch a long time ago (08/2002) because it was a
  need of a project, but had no time to send it to you. It adds support
  to `autologin' option of the telnet protocol. It has been used since
  made with busybox 0.60.3 at production and I had no problems with it.
  I have ported it to the HEAD revision of the CVS server (20040211) and
  I hope you enjoy and apply it to the official sources. :)

Thanks a lot!
This commit is contained in:
Eric Andersen 2004-02-22 12:25:47 +00:00
parent df2c56529c
commit 539ffc9129
3 changed files with 110 additions and 0 deletions
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15
include/usage.h
View File

@ -2415,11 +2415,26 @@
"$ cat /tmp/foo\n" \
"Hello\n"
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
#define telnet_trivial_usage \
"[-a] [-l USER] HOST [PORT]"
#define telnet_full_usage \
"Telnet is used to establish interactive communication with another\n" \
"computer over a network using the TELNET protocol.\n\n" \
"Options:\n" \
"\t-a\t\tAttempt an automatic login with the USER variable.\n" \
"\t-l USER\t\tAttempt an automatic login with the USER argument.\n" \
"\tHOST\t\tThe official name, alias or the IP address of the\n" \
"\t\t\tremote host.\n" \
"\tPORT\t\tThe remote port number to connect to. If it is not\n" \
"\t\t\tspecified, the default telnet (23) port is used.\n"
#else
#define telnet_trivial_usage \
"HOST [PORT]"
#define telnet_full_usage \
"Telnet is used to establish interactive communication with another\n"\
"computer over a network using the TELNET protocol."
#endif
#ifdef CONFIG_FEATURE_TELNETD_INETD
#define telnetd_trivial_usage \

10
networking/Config.in
View File

@ -479,6 +479,16 @@ config CONFIG_FEATURE_TELNET_TTYPE
remote host you are connecting to. This is useful to make sure that
things like ANSI colors and other control sequences behave.
config CONFIG_FEATURE_TELNET_AUTOLOGIN
bool " Pass USER type to remote host"
default y
depends on CONFIG_TELNET
help
Setting this option will forward the USER environment variable to the
remote host you are connecting to. This is useful when you need to
log into a machine without telling the username (autologin). This
option enables `-a' and `-l USER' arguments.
config CONFIG_TELNETD
bool "telnetd"
default n

85
networking/telnet.c
View File

@ -28,6 +28,8 @@
* Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen <andersen@codepoet.org>
* Modified 2001/05/07 to add ability to pass TTYPE to remote host by Jim McQuillan
* <jam@ltsp.org>
* Modified 2004/02/11 to add ability to pass the USER variable to remote host
* by Fernando Silveira <swrh@gmx.net>
*
*/
@ -129,6 +131,10 @@ static int one = 1;
static char *ttype;
#endif
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
static char *autologin;
#endif
#ifdef CONFIG_FEATURE_AUTOWIDTH
static int win_width, win_height;
#endif
@ -355,6 +361,34 @@ static void putiac_subopt(byte c, char *str)
}
#endif
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
static void putiac_subopt_autologin(void)
{
int len = strlen(autologin) + 6; // (2 + 1 + 1 + strlen + 2)
char *user = "USER";
if (G.iaclen + len > IACBUFSIZE)
iacflush();
putiac(IAC);
putiac(SB);
putiac(TELOPT_NEW_ENVIRON);
putiac(TELQUAL_IS);
putiac(NEW_ENV_VAR);
while(*user)
putiac(*user++);
putiac(NEW_ENV_VALUE);
while(*autologin)
putiac(*autologin++);
putiac(IAC);
putiac(SE);
}
#endif
#ifdef CONFIG_FEATURE_AUTOWIDTH
static void putiac_naws(byte c, int x, int y)
{
@ -495,6 +529,20 @@ static inline void to_ttype(void)
}
#endif
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
static inline void to_new_environ(void)
{
/* Tell server we will (or will not) do AUTOLOGIN */
if (autologin)
putiac2(WILL, TELOPT_NEW_ENVIRON);
else
putiac2(WONT, TELOPT_NEW_ENVIRON);
return;
}
#endif
#ifdef CONFIG_FEATURE_AUTOWIDTH
static inline void to_naws(void)
{
@ -513,6 +561,9 @@ static void telopt(byte c)
#ifdef CONFIG_FEATURE_TELNET_TTYPE
case TELOPT_TTYPE: to_ttype();break;
#endif
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
case TELOPT_NEW_ENVIRON: to_new_environ(); break;
#endif
#ifdef CONFIG_FEATURE_AUTOWIDTH
case TELOPT_NAWS: to_naws();
putiac_naws(c, win_width, win_height);
@ -539,6 +590,11 @@ static int subneg(byte c)
else
if (c == TELOPT_TTYPE)
putiac_subopt(TELOPT_TTYPE,ttype);
#endif
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
else
if (c == TELOPT_NEW_ENVIRON)
putiac_subopt_autologin();
#endif
break;
case TS_SUB2:
@ -579,6 +635,10 @@ extern int telnet_main(int argc, char** argv)
int maxfd;
#endif
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
int opt;
#endif
#ifdef CONFIG_FEATURE_AUTOWIDTH
get_terminal_width_height(0, &win_width, &win_height);
#endif
@ -598,8 +658,33 @@ extern int telnet_main(int argc, char** argv)
if (argc < 2)
bb_show_usage();
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
autologin = NULL;
while ((opt = getopt(argc, argv, "al:")) != EOF) {
switch (opt) {
case 'l':
autologin = bb_xstrdup(optarg);
break;
case 'a':
autologin = getenv("USER");
break;
case '?':
bb_show_usage();
break;
}
}
if (optind < argc) {
bb_lookup_host(&s_in, argv[optind++]);
s_in.sin_port = bb_lookup_port((optind < argc) ? argv[optind++] :
"telnet", "tcp", 23);
if (optind < argc)
bb_show_usage();
} else
bb_show_usage();
#else
bb_lookup_host(&s_in, argv[1]);
s_in.sin_port = bb_lookup_port((argc == 3) ? argv[2] : "telnet", "tcp", 23);
#endif
G.netfd = xconnect(&s_in);