mirror of
https://github.com/sheumann/hush.git
synced 2024-10-29 20:27:40 +00:00
telnet: someone tried to do data optimization before me. Complete it.
text data bss dec hex filename 2558 0 404 2962 b92 busybox.t2/networking/telnet.o 2542 0 0 2542 9ee busybox.t3/networking/telnet.o
This commit is contained in:
Denis Vlasenko
parent
dfce08f281
commit
f24cdf1554
@ -32,10 +32,10 @@
|
||||
#define TRACE(x, y)
|
||||
#endif
|
||||
|
||||
#define DATABUFSIZE 128
|
||||
#define IACBUFSIZE 128
|
||||
|
||||
enum {
|
||||
DATABUFSIZE = 128,
|
||||
IACBUFSIZE = 128,
|
||||
|
||||
CHM_TRY = 0,
|
||||
CHM_ON = 1,
|
||||
CHM_OFF = 2,
|
||||
@ -50,40 +50,36 @@ enum {
|
||||
TS_SUB2 = 5,
|
||||
};
|
||||
|
||||
#define WriteCS(fd, str) write(fd, str, sizeof str -1)
|
||||
|
||||
typedef unsigned char byte;
|
||||
|
||||
/* use globals to reduce size ??? */ /* test this hypothesis later */
|
||||
static struct Globalvars {
|
||||
int netfd; /* console fd:s are 0 and 1 (and 2) */
|
||||
/* same buffer used both for network and console read/write */
|
||||
char buf[DATABUFSIZE]; /* allocating so static size is smaller */
|
||||
|
||||
struct globals {
|
||||
int netfd; /* console fd:s are 0 and 1 (and 2) */
|
||||
short iaclen; /* could even use byte */
|
||||
byte telstate; /* telnet negotiation state from network input */
|
||||
byte telwish; /* DO, DONT, WILL, WONT */
|
||||
byte charmode;
|
||||
byte telflags;
|
||||
byte gotsig;
|
||||
byte do_termios;
|
||||
/* buffer to handle telnet negotiations */
|
||||
#if ENABLE_FEATURE_TELNET_TTYPE
|
||||
char *ttype;
|
||||
#endif
|
||||
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
||||
const char *autologin;
|
||||
#endif
|
||||
#if ENABLE_FEATURE_AUTOWIDTH
|
||||
int win_width, win_height;
|
||||
#endif
|
||||
/* same buffer used both for network and console read/write */
|
||||
char buf[DATABUFSIZE]; /* allocating so static size is smaller */
|
||||
char iacbuf[IACBUFSIZE];
|
||||
short iaclen; /* could even use byte */
|
||||
struct termios termios_def;
|
||||
struct termios termios_raw;
|
||||
} G;
|
||||
};
|
||||
|
||||
#define xUSE_GLOBALVAR_PTR /* xUSE... -> don't use :D (makes smaller code) */
|
||||
#define G (*(struct globals*)bb_common_bufsiz1)
|
||||
|
||||
#ifdef USE_GLOBALVAR_PTR
|
||||
struct Globalvars * Gptr;
|
||||
#define G (*Gptr)
|
||||
#endif
|
||||
|
||||
static void iacflush(void)
|
||||
{
|
||||
write(G.netfd, G.iacbuf, G.iaclen);
|
||||
G.iaclen = 0;
|
||||
}
|
||||
|
||||
/* Function prototypes */
|
||||
static void rawmode(void);
|
||||
@ -93,20 +89,16 @@ static void will_charmode(void);
|
||||
static void telopt(byte c);
|
||||
static int subneg(byte c);
|
||||
|
||||
/* Some globals */
|
||||
#ifdef CONFIG_FEATURE_TELNET_TTYPE
|
||||
static char *ttype;
|
||||
#endif
|
||||
static void iacflush(void)
|
||||
{
|
||||
write(G.netfd, G.iacbuf, G.iaclen);
|
||||
G.iaclen = 0;
|
||||
}
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
||||
static const char *autologin;
|
||||
#endif
|
||||
#define write_str(fd, str) write(fd, str, sizeof(str) - 1)
|
||||
|
||||
#ifdef CONFIG_FEATURE_AUTOWIDTH
|
||||
static int win_width, win_height;
|
||||
#endif
|
||||
|
||||
static void doexit(int ev)
|
||||
static void /* buffer to handle telnet negotiations */
|
||||
doexit(int ev)
|
||||
{
|
||||
cookmode();
|
||||
exit(ev);
|
||||
@ -119,7 +111,7 @@ static void conescape(void)
|
||||
if (G.gotsig) /* came from line mode... go raw */
|
||||
rawmode();
|
||||
|
||||
WriteCS(1, "\r\nConsole escape. Commands are:\r\n\n"
|
||||
write_str(1, "\r\nConsole escape. Commands are:\r\n\n"
|
||||
" l go to line mode\r\n"
|
||||
" c go to character mode\r\n"
|
||||
" z suspend telnet\r\n"
|
||||
@ -128,18 +120,15 @@ static void conescape(void)
|
||||
if (read(0, &b, 1) <= 0)
|
||||
doexit(1);
|
||||
|
||||
switch (b)
|
||||
{
|
||||
switch (b) {
|
||||
case 'l':
|
||||
if (!G.gotsig)
|
||||
{
|
||||
if (!G.gotsig) {
|
||||
do_linemode();
|
||||
goto rrturn;
|
||||
}
|
||||
break;
|
||||
case 'c':
|
||||
if (G.gotsig)
|
||||
{
|
||||
if (G.gotsig) {
|
||||
will_charmode();
|
||||
goto rrturn;
|
||||
}
|
||||
@ -153,7 +142,7 @@ static void conescape(void)
|
||||
doexit(0);
|
||||
}
|
||||
|
||||
WriteCS(1, "continuing...\r\n");
|
||||
write_str(1, "continuing...\r\n");
|
||||
|
||||
if (G.gotsig)
|
||||
cookmode();
|
||||
@ -296,7 +285,7 @@ static void putiac2(byte wwdd, byte c)
|
||||
putiac(c);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_TTYPE
|
||||
#if ENABLE_FEATURE_TELNET_TTYPE
|
||||
static void putiac_subopt(byte c, char *str)
|
||||
{
|
||||
int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
|
||||
@ -317,10 +306,10 @@ static void putiac_subopt(byte c, char *str)
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
||||
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
||||
static void putiac_subopt_autologin(void)
|
||||
{
|
||||
int len = strlen(autologin) + 6; // (2 + 1 + 1 + strlen + 2)
|
||||
int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
|
||||
const char *user = "USER";
|
||||
|
||||
if (G.iaclen + len > IACBUFSIZE)
|
||||
@ -337,15 +326,15 @@ static void putiac_subopt_autologin(void)
|
||||
|
||||
putiac(NEW_ENV_VALUE);
|
||||
|
||||
while (*autologin)
|
||||
putiac(*autologin++);
|
||||
while (*G.autologin)
|
||||
putiac(*G.autologin++);
|
||||
|
||||
putiac(IAC);
|
||||
putiac(SE);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_AUTOWIDTH
|
||||
#if ENABLE_FEATURE_AUTOWIDTH
|
||||
static void putiac_naws(byte c, int x, int y)
|
||||
{
|
||||
if (G.iaclen + 9 > IACBUFSIZE)
|
||||
@ -419,24 +408,27 @@ static void do_linemode(void)
|
||||
|
||||
static void to_notsup(char c)
|
||||
{
|
||||
if (G.telwish == WILL) putiac2(DONT, c);
|
||||
else if (G.telwish == DO) putiac2(WONT, c);
|
||||
if (G.telwish == WILL)
|
||||
putiac2(DONT, c);
|
||||
else if (G.telwish == DO)
|
||||
putiac2(WONT, c);
|
||||
}
|
||||
|
||||
static void to_echo(void)
|
||||
{
|
||||
/* if server requests ECHO, don't agree */
|
||||
if (G.telwish == DO) { putiac2(WONT, TELOPT_ECHO); return; }
|
||||
else if (G.telwish == DONT) return;
|
||||
if (G.telwish == DO) {
|
||||
putiac2(WONT, TELOPT_ECHO);
|
||||
return;
|
||||
}
|
||||
if (G.telwish == DONT)
|
||||
return;
|
||||
|
||||
if (G.telflags & UF_ECHO)
|
||||
{
|
||||
if (G.telflags & UF_ECHO) {
|
||||
if (G.telwish == WILL)
|
||||
return;
|
||||
}
|
||||
else
|
||||
if (G.telwish == WONT)
|
||||
return;
|
||||
} else if (G.telwish == WONT)
|
||||
return;
|
||||
|
||||
if (G.charmode != CHM_OFF)
|
||||
G.telflags ^= UF_ECHO;
|
||||
@ -447,21 +439,18 @@ static void to_echo(void)
|
||||
putiac2(DONT, TELOPT_ECHO);
|
||||
|
||||
setConMode();
|
||||
WriteCS(1, "\r\n"); /* sudden modec */
|
||||
write_str(1, "\r\n"); /* sudden modec */
|
||||
}
|
||||
|
||||
static void to_sga(void)
|
||||
{
|
||||
/* daemon always sends will/wont, client do/dont */
|
||||
|
||||
if (G.telflags & UF_SGA)
|
||||
{
|
||||
if (G.telflags & UF_SGA) {
|
||||
if (G.telwish == WILL)
|
||||
return;
|
||||
}
|
||||
else
|
||||
if (G.telwish == WONT)
|
||||
return;
|
||||
} else if (G.telwish == WONT)
|
||||
return;
|
||||
|
||||
if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
|
||||
putiac2(DO, TELOPT_SGA);
|
||||
@ -469,31 +458,31 @@ static void to_sga(void)
|
||||
putiac2(DONT, TELOPT_SGA);
|
||||
}
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_TTYPE
|
||||
#if ENABLE_FEATURE_TELNET_TTYPE
|
||||
static void to_ttype(void)
|
||||
{
|
||||
/* Tell server we will (or won't) do TTYPE */
|
||||
|
||||
if(ttype)
|
||||
if (G.ttype)
|
||||
putiac2(WILL, TELOPT_TTYPE);
|
||||
else
|
||||
putiac2(WONT, TELOPT_TTYPE);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
||||
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
||||
static void to_new_environ(void)
|
||||
{
|
||||
/* Tell server we will (or will not) do AUTOLOGIN */
|
||||
|
||||
if (autologin)
|
||||
if (G.autologin)
|
||||
putiac2(WILL, TELOPT_NEW_ENVIRON);
|
||||
else
|
||||
putiac2(WONT, TELOPT_NEW_ENVIRON);
|
||||
}
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_AUTOWIDTH
|
||||
#if ENABLE_FEATURE_AUTOWIDTH
|
||||
static void to_naws(void)
|
||||
{
|
||||
/* Tell server we will do NAWS */
|
||||
@ -508,18 +497,18 @@ static void telopt(byte c)
|
||||
to_echo(); break;
|
||||
case TELOPT_SGA:
|
||||
to_sga(); break;
|
||||
#ifdef CONFIG_FEATURE_TELNET_TTYPE
|
||||
#if ENABLE_FEATURE_TELNET_TTYPE
|
||||
case TELOPT_TTYPE:
|
||||
to_ttype(); break;
|
||||
#endif
|
||||
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
||||
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
||||
case TELOPT_NEW_ENVIRON:
|
||||
to_new_environ(); break;
|
||||
#endif
|
||||
#ifdef CONFIG_FEATURE_AUTOWIDTH
|
||||
#if ENABLE_FEATURE_AUTOWIDTH
|
||||
case TELOPT_NAWS:
|
||||
to_naws();
|
||||
putiac_naws(c, win_width, win_height);
|
||||
putiac_naws(c, G.win_width, G.win_height);
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
@ -535,17 +524,16 @@ static void telopt(byte c)
|
||||
|
||||
static int subneg(byte c)
|
||||
{
|
||||
switch (G.telstate)
|
||||
{
|
||||
switch (G.telstate) {
|
||||
case TS_SUB1:
|
||||
if (c == IAC)
|
||||
G.telstate = TS_SUB2;
|
||||
#ifdef CONFIG_FEATURE_TELNET_TTYPE
|
||||
#if ENABLE_FEATURE_TELNET_TTYPE
|
||||
else
|
||||
if (c == TELOPT_TTYPE)
|
||||
putiac_subopt(TELOPT_TTYPE,ttype);
|
||||
putiac_subopt(TELOPT_TTYPE, G.ttype);
|
||||
#endif
|
||||
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
||||
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
||||
else
|
||||
if (c == TELOPT_NEW_ENVIRON)
|
||||
putiac_subopt_autologin();
|
||||
@ -578,6 +566,8 @@ static void cookmode(void)
|
||||
if (G.do_termios) tcsetattr(0, TCSADRAIN, &G.termios_def);
|
||||
}
|
||||
|
||||
void BUG_telnet_globals_too_big(void);
|
||||
|
||||
int telnet_main(int argc, char** argv);
|
||||
int telnet_main(int argc, char** argv)
|
||||
{
|
||||
@ -591,16 +581,18 @@ int telnet_main(int argc, char** argv)
|
||||
int maxfd;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_AUTOWIDTH
|
||||
get_terminal_width_height(0, &win_width, &win_height);
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_TTYPE
|
||||
ttype = getenv("TERM");
|
||||
#endif
|
||||
|
||||
if (sizeof(G) > sizeof(bb_common_bufsiz1))
|
||||
BUG_telnet_globals_too_big();
|
||||
/* memset(&G, 0, sizeof G); - already is */
|
||||
|
||||
#if ENABLE_FEATURE_AUTOWIDTH
|
||||
get_terminal_width_height(0, &G.win_width, &G.win_height);
|
||||
#endif
|
||||
|
||||
#if ENABLE_FEATURE_TELNET_TTYPE
|
||||
G.ttype = getenv("TERM");
|
||||
#endif
|
||||
|
||||
if (tcgetattr(0, &G.termios_def) >= 0) {
|
||||
G.do_termios = 1;
|
||||
G.termios_raw = G.termios_def;
|
||||
@ -610,9 +602,9 @@ int telnet_main(int argc, char** argv)
|
||||
if (argc < 2)
|
||||
bb_show_usage();
|
||||
|
||||
#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
|
||||
if (1 & getopt32(argc, argv, "al:", &autologin))
|
||||
autologin = getenv("USER");
|
||||
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
|
||||
if (1 & getopt32(argc, argv, "al:", &G.autologin))
|
||||
G.autologin = getenv("USER");
|
||||
argv += optind;
|
||||
#else
|
||||
argv++;
|
||||
@ -667,12 +659,9 @@ int telnet_main(int argc, char** argv)
|
||||
#endif
|
||||
{
|
||||
len = read(0, G.buf, DATABUFSIZE);
|
||||
|
||||
if (len <= 0)
|
||||
doexit(0);
|
||||
|
||||
TRACE(0, ("Read con: %d\n", len));
|
||||
|
||||
handlenetoutput(len);
|
||||
}
|
||||
|
||||
@ -683,13 +672,11 @@ int telnet_main(int argc, char** argv)
|
||||
#endif
|
||||
{
|
||||
len = read(G.netfd, G.buf, DATABUFSIZE);
|
||||
|
||||
if (len <= 0) {
|
||||
WriteCS(1, "Connection closed by foreign host.\r\n");
|
||||
write_str(1, "Connection closed by foreign host\r\n");
|
||||
doexit(1);
|
||||
}
|
||||
TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
|
||||
|
||||
handlenetinput(len);
|
||||
}
|
||||
}
|
||||
|
||||
Loading…
Reference in New Issue
Block a user