*/
#include <termios.h>
-#include <unistd.h>
-#include <errno.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <signal.h>
#include <arpa/telnet.h>
-#include <sys/types.h>
-#include <sys/socket.h>
#include <netinet/in.h>
-#include "busybox.h"
-
-#if 0
-static const int DOTRACE = 1;
-#endif
+#include "libbb.h"
#ifdef DOTRACE
-#include <arpa/inet.h> /* for inet_ntoa()... */
#define TRACE(x, y) do { if (x) printf y; } while (0)
#else
#define TRACE(x, y)
#endif
-#if 0
-#define USE_POLL
-#include <sys/poll.h>
-#else
-#include <sys/time.h>
-#endif
-
-#define DATABUFSIZE 128
-#define IACBUFSIZE 128
+enum {
+ DATABUFSIZE = 128,
+ IACBUFSIZE = 128,
-static const int CHM_TRY = 0;
-static const int CHM_ON = 1;
-static const int CHM_OFF = 2;
+ CHM_TRY = 0,
+ CHM_ON = 1,
+ CHM_OFF = 2,
-static const int UF_ECHO = 0x01;
-static const int UF_SGA = 0x02;
+ UF_ECHO = 0x01,
+ UF_SGA = 0x02,
-enum {
TS_0 = 1,
TS_IAC = 2,
TS_OPT = 3,
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;
+#if ENABLE_FEATURE_TELNET_TTYPE
+ char *ttype;
+#endif
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+ const char *autologin;
+#endif
+#if ENABLE_FEATURE_AUTOWIDTH
+ unsigned win_width, win_height;
+#endif
+ /* same buffer used both for network and console read/write */
+ char buf[DATABUFSIZE];
/* buffer to handle telnet negotiations */
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
-
-static inline void iacflush(void)
-{
- write(G.netfd, G.iacbuf, G.iaclen);
- G.iaclen = 0;
-}
+};
+#define G (*(struct globals*)&bb_common_bufsiz1)
+void BUG_telnet_globals_too_big(void);
+#define INIT_G() do { \
+ if (sizeof(G) > COMMON_BUFSIZE) \
+ BUG_telnet_globals_too_big(); \
+ /* memset(&G, 0, sizeof G); - already is */ \
+} while (0)
/* Function prototypes */
static void rawmode(void);
static void telopt(byte c);
static int subneg(byte c);
-/* Some globals */
-static int one = 1;
-
-#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) ATTRIBUTE_NORETURN;
static void doexit(int ev)
{
cookmode();
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"
" e exit telnet\r\n");
- if (read(0, &b, 1) <= 0)
- doexit(1);
+ if (read(STDIN_FILENO, &b, 1) <= 0)
+ doexit(EXIT_FAILURE);
- 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;
}
rawmode();
break;
case 'e':
- doexit(0);
+ doexit(EXIT_SUCCESS);
}
- WriteCS(1, "continuing...\r\n");
+ write_str(1, "continuing...\r\n");
if (G.gotsig)
cookmode();
G.gotsig = 0;
}
+
static void handlenetoutput(int len)
{
- /* here we could do smart tricks how to handle 0xFF:s in output
- * stream like writing twice every sequence of FF:s (thus doing
- * many write()s. But I think interactive telnet application does
- * not need to be 100% 8-bit clean, so changing every 0xff:s to
- * 0x7f:s
+ /* here we could do smart tricks how to handle 0xFF:s in output
+ * stream like writing twice every sequence of FF:s (thus doing
+ * many write()s. But I think interactive telnet application does
+ * not need to be 100% 8-bit clean, so changing every 0xff:s to
+ * 0x7f:s
*
- * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
- * I don't agree.
- * first - I cannot use programs like sz/rz
- * second - the 0x0D is sent as one character and if the next
- * char is 0x0A then it's eaten by a server side.
- * third - whay doy you have to make 'many write()s'?
- * I don't understand.
- * So I implemented it. It's realy useful for me. I hope that
- * others people will find it interesting to.
+ * 2002-mar-21, Przemyslaw Czerpak (druzus@polbox.com)
+ * I don't agree.
+ * first - I cannot use programs like sz/rz
+ * second - the 0x0D is sent as one character and if the next
+ * char is 0x0A then it's eaten by a server side.
+ * third - whay doy you have to make 'many write()s'?
+ * I don't understand.
+ * So I implemented it. It's realy useful for me. I hope that
+ * others people will find it interesting too.
*/
int i, j;
byte * p = (byte*)G.buf;
byte outbuf[4*DATABUFSIZE];
- for (i = len, j = 0; i > 0; i--, p++)
- {
- if (*p == 0x1d)
- {
+ for (i = len, j = 0; i > 0; i--, p++) {
+ if (*p == 0x1d) {
conescape();
return;
}
outbuf[j++] = *p;
if (*p == 0xff)
- outbuf[j++] = 0xff;
+ outbuf[j++] = 0xff;
else if (*p == 0x0d)
- outbuf[j++] = 0x00;
+ outbuf[j++] = 0x00;
}
- if (j > 0 )
- write(G.netfd, outbuf, j);
+ if (j > 0)
+ write(G.netfd, outbuf, j);
}
-
static void handlenetinput(int len)
{
int i;
int cstart = 0;
- for (i = 0; i < len; i++)
- {
+ for (i = 0; i < len; i++) {
byte c = G.buf[i];
- if (G.telstate == 0) /* most of the time state == 0 */
- {
- if (c == IAC)
- {
+ if (G.telstate == 0) { /* most of the time state == 0 */
+ if (c == IAC) {
cstart = i;
G.telstate = TS_IAC;
}
- }
- else
- switch (G.telstate)
- {
- case TS_0:
- if (c == IAC)
- G.telstate = TS_IAC;
- else
- G.buf[cstart++] = c;
- break;
-
- case TS_IAC:
- if (c == IAC) /* IAC IAC -> 0xFF */
- {
- G.buf[cstart++] = c;
- G.telstate = TS_0;
- break;
- }
- /* else */
- switch (c)
- {
- case SB:
- G.telstate = TS_SUB1;
- break;
- case DO:
- case DONT:
- case WILL:
- case WONT:
- G.telwish = c;
- G.telstate = TS_OPT;
- break;
- default:
- G.telstate = TS_0; /* DATA MARK must be added later */
- }
- break;
- case TS_OPT: /* WILL, WONT, DO, DONT */
- telopt(c);
- G.telstate = TS_0;
- break;
- case TS_SUB1: /* Subnegotiation */
- case TS_SUB2: /* Subnegotiation */
- if (subneg(c))
- G.telstate = TS_0;
- break;
- }
+ } else
+ switch (G.telstate) {
+ case TS_0:
+ if (c == IAC)
+ G.telstate = TS_IAC;
+ else
+ G.buf[cstart++] = c;
+ break;
+
+ case TS_IAC:
+ if (c == IAC) { /* IAC IAC -> 0xFF */
+ G.buf[cstart++] = c;
+ G.telstate = TS_0;
+ break;
+ }
+ /* else */
+ switch (c) {
+ case SB:
+ G.telstate = TS_SUB1;
+ break;
+ case DO:
+ case DONT:
+ case WILL:
+ case WONT:
+ G.telwish = c;
+ G.telstate = TS_OPT;
+ break;
+ default:
+ G.telstate = TS_0; /* DATA MARK must be added later */
+ }
+ break;
+ case TS_OPT: /* WILL, WONT, DO, DONT */
+ telopt(c);
+ G.telstate = TS_0;
+ break;
+ case TS_SUB1: /* Subnegotiation */
+ case TS_SUB2: /* Subnegotiation */
+ if (subneg(c))
+ G.telstate = TS_0;
+ break;
+ }
}
- if (G.telstate)
- {
- if (G.iaclen) iacflush();
+ if (G.telstate) {
+ if (G.iaclen) iacflush();
if (G.telstate == TS_0) G.telstate = 0;
-
len = cstart;
}
if (len)
- write(1, G.buf, len);
+ write(STDOUT_FILENO, G.buf, len);
}
-
-/* ******************************* */
-
-static inline void putiac(int c)
+static void putiac(int c)
{
G.iacbuf[G.iaclen++] = c;
}
-
static void putiac2(byte wwdd, byte c)
{
if (G.iaclen + 3 > IACBUFSIZE)
putiac(c);
}
-#if 0
-static void putiac1(byte c)
-{
- if (G.iaclen + 2 > IACBUFSIZE)
- iacflush();
-
- putiac(IAC);
- putiac(c);
-}
-#endif
-
-#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 )
putiac(c);
putiac(0);
- while(*str)
+ while (*str)
putiac(*str++);
putiac(IAC);
}
#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)
- char *user = "USER";
+ int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
+ const char *user = "USER";
if (G.iaclen + len > IACBUFSIZE)
iacflush();
putiac(TELQUAL_IS);
putiac(NEW_ENV_VAR);
- while(*user)
+ while (*user)
putiac(*user++);
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)
}
#endif
-/* void putiacstring (subneg strings) */
-
-/* ******************************* */
-
-static char const escapecharis[] = "\r\nEscape character is ";
+static char const escapecharis[] ALIGN1 = "\r\nEscape character is ";
static void setConMode(void)
{
- if (G.telflags & UF_ECHO)
- {
+ if (G.telflags & UF_ECHO) {
if (G.charmode == CHM_TRY) {
G.charmode = CHM_ON;
printf("\r\nEntering character mode%s'^]'.\r\n", escapecharis);
rawmode();
}
- }
- else
- {
+ } else {
if (G.charmode != CHM_OFF) {
G.charmode = CHM_OFF;
printf("\r\nEntering line mode%s'^C'.\r\n", escapecharis);
}
}
-/* ******************************* */
-
static void will_charmode(void)
{
G.charmode = CHM_TRY;
iacflush();
}
-/* ******************************* */
-
-static inline void to_notsup(char c)
+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 inline void to_echo(void)
+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;
putiac2(DONT, TELOPT_ECHO);
setConMode();
- WriteCS(1, "\r\n"); /* sudden modec */
+ write_str(1, "\r\n"); /* sudden modec */
}
-static inline void to_sga(void)
+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 */
+ G.telflags ^= UF_SGA; /* toggle */
+ if (G.telflags & UF_SGA)
putiac2(DO, TELOPT_SGA);
else
putiac2(DONT, TELOPT_SGA);
-
- return;
}
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
-static inline void to_ttype(void)
+#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);
-
- return;
}
#endif
-#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
-static inline void to_new_environ(void)
+#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);
-
- return;
}
#endif
-#ifdef CONFIG_FEATURE_AUTOWIDTH
-static inline void to_naws(void)
+#if ENABLE_FEATURE_AUTOWIDTH
+static void to_naws(void)
{
/* Tell server we will do NAWS */
putiac2(WILL, TELOPT_NAWS);
- return;
}
#endif
static void telopt(byte c)
{
- switch (c)
- {
- case TELOPT_ECHO: to_echo(); break;
- case TELOPT_SGA: to_sga(); break;
-#ifdef CONFIG_FEATURE_TELNET_TTYPE
- case TELOPT_TTYPE: to_ttype();break;
+ switch (c) {
+ case TELOPT_ECHO:
+ to_echo(); break;
+ case TELOPT_SGA:
+ to_sga(); break;
+#if ENABLE_FEATURE_TELNET_TTYPE
+ case TELOPT_TTYPE:
+ to_ttype(); break;
#endif
-#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
- case TELOPT_NEW_ENVIRON: to_new_environ(); break;
+#if ENABLE_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);
- break;
+#if ENABLE_FEATURE_AUTOWIDTH
+ case TELOPT_NAWS:
+ to_naws();
+ putiac_naws(c, G.win_width, G.win_height);
+ break;
#endif
- default: to_notsup(c);
- break;
+ default:
+ to_notsup(c);
+ break;
}
}
-
-/* ******************************* */
-
/* subnegotiation -- ignore all (except TTYPE,NAWS) */
-
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();
return FALSE;
}
-/* ******************************* */
-
static void fgotsig(int sig)
{
G.gotsig = sig;
static void rawmode(void)
{
- if (G.do_termios) tcsetattr(0, TCSADRAIN, &G.termios_raw);
+ if (G.do_termios)
+ tcsetattr(0, TCSADRAIN, &G.termios_raw);
}
static void cookmode(void)
{
- if (G.do_termios) tcsetattr(0, TCSADRAIN, &G.termios_def);
+ if (G.do_termios)
+ tcsetattr(0, TCSADRAIN, &G.termios_def);
}
-int telnet_main(int argc, char** argv)
+/* poll gives smaller (-70 bytes) code */
+#define USE_POLL 1
+
+int telnet_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int telnet_main(int argc, char **argv)
{
+ char *host;
+ int port;
int len;
- struct sockaddr_in s_in;
#ifdef USE_POLL
struct pollfd ufds[2];
#else
int maxfd;
#endif
-#ifdef CONFIG_FEATURE_AUTOWIDTH
- get_terminal_width_height(0, &win_width, &win_height);
-#endif
+ INIT_G();
-#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);
+#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;
cfmakeraw(&G.termios_raw);
}
if (argc < 2)
bb_show_usage();
-#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
- if (1 & bb_getopt_ulflags(argc, argv, "al:", &autologin))
- autologin = getenv("USER");
-
- 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();
+#if ENABLE_FEATURE_TELNET_AUTOLOGIN
+ if (1 & getopt32(argv, "al:", &G.autologin))
+ G.autologin = getenv("USER");
+ argv += optind;
#else
- bb_lookup_host(&s_in, argv[1]);
- s_in.sin_port = bb_lookup_port((argc == 3) ? argv[2] : "telnet", "tcp", 23);
+ argv++;
#endif
+ if (!*argv)
+ bb_show_usage();
+ host = *argv++;
+ port = bb_lookup_port(*argv ? *argv++ : "telnet", "tcp", 23);
+ if (*argv) /* extra params?? */
+ bb_show_usage();
- G.netfd = xconnect(&s_in);
+ G.netfd = create_and_connect_stream_or_die(host, port);
- setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one);
+ setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
signal(SIGINT, fgotsig);
ufds[0].events = ufds[1].events = POLLIN;
#else
FD_ZERO(&readfds);
- FD_SET(0, &readfds);
+ FD_SET(STDIN_FILENO, &readfds);
FD_SET(G.netfd, &readfds);
maxfd = G.netfd + 1;
#endif
- while (1)
- {
+ while (1) {
#ifndef USE_POLL
fd_set rfds = readfds;
#ifdef USE_POLL
if (ufds[0].revents) /* well, should check POLLIN, but ... */
#else
- if (FD_ISSET(0, &rfds))
+ if (FD_ISSET(STDIN_FILENO, &rfds))
#endif
{
- len = read(0, G.buf, DATABUFSIZE);
-
+ len = read(STDIN_FILENO, G.buf, DATABUFSIZE);
if (len <= 0)
- doexit(0);
-
+ doexit(EXIT_SUCCESS);
TRACE(0, ("Read con: %d\n", len));
-
handlenetoutput(len);
}
#endif
{
len = read(G.netfd, G.buf, DATABUFSIZE);
-
- if (len <= 0)
- {
- WriteCS(1, "Connection closed by foreign host.\r\n");
- doexit(1);
+ if (len <= 0) {
+ write_str(1, "Connection closed by foreign host\r\n");
+ doexit(EXIT_FAILURE);
}
TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
-
handlenetinput(len);
}
}
}
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/
projects / oweals / busybox.git / blobdiff