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Diffstat (limited to 'networking/telnet.c')
-rw-r--r--networking/telnet.c179
1 files changed, 83 insertions, 96 deletions
diff --git a/networking/telnet.c b/networking/telnet.c
index 1341572..82dbb58 100644
--- a/networking/telnet.c
+++ b/networking/telnet.c
@@ -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) */
+};
-#ifdef USE_GLOBALVAR_PTR
-struct Globalvars * Gptr;
-#define G (*Gptr)
-#endif
+#define G (*(struct globals*)bb_common_bufsiz1)
-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
-
-#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
-static const char *autologin;
-#endif
+static void iacflush(void)
+{
+ write(G.netfd, G.iacbuf, G.iaclen);
+ G.iaclen = 0;
+}
-#ifdef CONFIG_FEATURE_AUTOWIDTH
-static int win_width, win_height;
-#endif
+#define write_str(fd, str) write(fd, str, sizeof(str) - 1)
-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)
{
@@ -591,15 +581,17 @@ int telnet_main(int argc, char** argv)
int maxfd;
#endif
-#ifdef CONFIG_FEATURE_AUTOWIDTH
- get_terminal_width_height(0, &win_width, &win_height);
-#endif
+ if (sizeof(G) > sizeof(bb_common_bufsiz1))
+ BUG_telnet_globals_too_big();
+ /* memset(&G, 0, sizeof G); - already is */
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
- ttype = getenv("TERM");
+#if ENABLE_FEATURE_AUTOWIDTH
+ get_terminal_width_height(0, &G.win_width, &G.win_height);
#endif
- /* memset(&G, 0, sizeof G); - already is */
+#if ENABLE_FEATURE_TELNET_TTYPE
+ G.ttype = getenv("TERM");
+#endif
if (tcgetattr(0, &G.termios_def) >= 0) {
G.do_termios = 1;
@@ -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);
}
}
generated by cgit v1.1 at 2024-12-27 06:52:11 +0000