*
*/
-#include <termios.h>
-#include <arpa/telnet.h>
#include <netinet/in.h>
#include "libbb.h"
+#ifdef __BIONIC__
+/* should be in arpa/telnet.h */
+#define IAC 255 /* interpret as command: */
+#define DONT 254 /* you are not to use option */
+#define DO 253 /* please, you use option */
+#define WONT 252 /* I won't use option */
+#define WILL 251 /* I will use option */
+#define SB 250 /* interpret as subnegotiation */
+#define SE 240 /* end sub negotiation */
+#define TELOPT_ECHO 1 /* echo */
+#define TELOPT_SGA 3 /* suppress go ahead */
+#define TELOPT_TTYPE 24 /* terminal type */
+#define TELOPT_NAWS 31 /* window size */
+#else
+#include <arpa/telnet.h>
+#endif
#ifdef DOTRACE
#define TRACE(x, y) do { if (x) printf y; } while (0)
typedef unsigned char byte;
+enum { netfd = 3 };
struct globals {
- int netfd; /* console fd:s are 0 and 1 (and 2) */
- short iaclen; /* could even use byte */
+ int iaclen; /* could even use byte, but it's a loss on x86 */
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;
const char *autologin;
#endif
#if ENABLE_FEATURE_AUTOWIDTH
- int win_width, win_height;
+ unsigned win_width, win_height;
#endif
/* same buffer used both for network and console read/write */
char buf[DATABUFSIZE];
struct termios termios_def;
struct termios termios_raw;
};
-
-#define G (*(struct globals*)bb_common_bufsiz1)
-
+#define G (*(struct globals*)&bb_common_bufsiz1)
+#define INIT_G() do { \
+ struct G_sizecheck { \
+ char G_sizecheck[sizeof(G) > COMMON_BUFSIZE ? -1 : 1]; \
+ }; \
+} while (0)
/* Function prototypes */
static void rawmode(void);
static void telopt(byte c);
static int subneg(byte c);
-static void iacflush(void)
+static void iac_flush(void)
{
- write(G.netfd, G.iacbuf, G.iaclen);
+ write(netfd, G.iacbuf, G.iaclen);
G.iaclen = 0;
}
#define write_str(fd, str) write(fd, str, sizeof(str) - 1)
+static void doexit(int ev) NORETURN;
static void doexit(int ev)
{
cookmode();
exit(ev);
}
-static void conescape(void)
+static void con_escape(void)
{
char b;
- if (G.gotsig) /* came from line mode... go raw */
+ if (bb_got_signal) /* came from line mode... go raw */
rawmode();
write_str(1, "\r\nConsole escape. Commands are:\r\n\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) {
case 'l':
- if (!G.gotsig) {
+ if (!bb_got_signal) {
do_linemode();
- goto rrturn;
+ goto ret;
}
break;
case 'c':
- if (G.gotsig) {
+ if (bb_got_signal) {
will_charmode();
- goto rrturn;
+ goto ret;
}
break;
case 'z':
rawmode();
break;
case 'e':
- doexit(0);
+ doexit(EXIT_SUCCESS);
}
write_str(1, "continuing...\r\n");
- if (G.gotsig)
+ if (bb_got_signal)
cookmode();
-
- rrturn:
- G.gotsig = 0;
+ ret:
+ bb_got_signal = 0;
}
-static void handlenetoutput(int len)
+static void handle_net_output(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 - why do you have to make 'many write()s'?
+ * I don't understand.
+ * So I implemented it. It's really useful for me. I hope that
+ * other people will find it interesting too.
*/
int i, j;
- byte * p = (byte*)G.buf;
+ byte *p = (byte*)G.buf;
byte outbuf[4*DATABUFSIZE];
- for (i = len, j = 0; i > 0; i--, p++)
- {
- if (*p == 0x1d)
- {
- conescape();
+ for (i = len, j = 0; i > 0; i--, p++) {
+ if (*p == 0x1d) {
+ con_escape();
return;
}
outbuf[j++] = *p;
outbuf[j++] = 0x00;
}
if (j > 0)
- write(G.netfd, outbuf, j);
+ write(netfd, outbuf, j);
}
-static void handlenetinput(int len)
+static void handle_net_input(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;
}
+ continue;
}
- 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 == TS_0) G.telstate = 0;
+ 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)
+ iac_flush();
+ if (G.telstate == TS_0)
+ G.telstate = 0;
len = cstart;
}
if (len)
- write(1, G.buf, len);
+ write(STDOUT_FILENO, G.buf, len);
}
-static void putiac(int c)
+static void put_iac(int c)
{
G.iacbuf[G.iaclen++] = c;
}
-static void putiac2(byte wwdd, byte c)
+static void put_iac2(byte wwdd, byte c)
{
if (G.iaclen + 3 > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(wwdd);
- putiac(c);
+ put_iac(IAC);
+ put_iac(wwdd);
+ put_iac(c);
}
#if ENABLE_FEATURE_TELNET_TTYPE
-static void putiac_subopt(byte c, char *str)
+static void put_iac_subopt(byte c, char *str)
{
- int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
+ int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
if (G.iaclen + len > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(SB);
- putiac(c);
- putiac(0);
+ put_iac(IAC);
+ put_iac(SB);
+ put_iac(c);
+ put_iac(0);
while (*str)
- putiac(*str++);
+ put_iac(*str++);
- putiac(IAC);
- putiac(SE);
+ put_iac(IAC);
+ put_iac(SE);
}
#endif
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
-static void putiac_subopt_autologin(void)
+static void put_iac_subopt_autologin(void)
{
int len = strlen(G.autologin) + 6; // (2 + 1 + 1 + strlen + 2)
const char *user = "USER";
if (G.iaclen + len > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(SB);
- putiac(TELOPT_NEW_ENVIRON);
- putiac(TELQUAL_IS);
- putiac(NEW_ENV_VAR);
+ put_iac(IAC);
+ put_iac(SB);
+ put_iac(TELOPT_NEW_ENVIRON);
+ put_iac(TELQUAL_IS);
+ put_iac(NEW_ENV_VAR);
while (*user)
- putiac(*user++);
+ put_iac(*user++);
- putiac(NEW_ENV_VALUE);
+ put_iac(NEW_ENV_VALUE);
while (*G.autologin)
- putiac(*G.autologin++);
+ put_iac(*G.autologin++);
- putiac(IAC);
- putiac(SE);
+ put_iac(IAC);
+ put_iac(SE);
}
#endif
#if ENABLE_FEATURE_AUTOWIDTH
-static void putiac_naws(byte c, int x, int y)
+static void put_iac_naws(byte c, int x, int y)
{
if (G.iaclen + 9 > IACBUFSIZE)
- iacflush();
+ iac_flush();
- putiac(IAC);
- putiac(SB);
- putiac(c);
+ put_iac(IAC);
+ put_iac(SB);
+ put_iac(c);
- putiac((x >> 8) & 0xff);
- putiac(x & 0xff);
- putiac((y >> 8) & 0xff);
- putiac(y & 0xff);
+ put_iac((x >> 8) & 0xff);
+ put_iac(x & 0xff);
+ put_iac((y >> 8) & 0xff);
+ put_iac(y & 0xff);
- putiac(IAC);
- putiac(SE);
+ put_iac(IAC);
+ put_iac(SE);
}
#endif
-static char const escapecharis[] = "\r\nEscape character is ";
+static char const escapecharis[] ALIGN1 = "\r\nEscape character is ";
static void setConMode(void)
{
G.telflags |= (UF_ECHO | UF_SGA);
setConMode();
- putiac2(DO, TELOPT_ECHO);
- putiac2(DO, TELOPT_SGA);
- iacflush();
+ put_iac2(DO, TELOPT_ECHO);
+ put_iac2(DO, TELOPT_SGA);
+ iac_flush();
}
static void do_linemode(void)
G.telflags &= ~(UF_ECHO | UF_SGA);
setConMode();
- putiac2(DONT, TELOPT_ECHO);
- putiac2(DONT, TELOPT_SGA);
- iacflush();
+ put_iac2(DONT, TELOPT_ECHO);
+ put_iac2(DONT, TELOPT_SGA);
+ iac_flush();
}
static void to_notsup(char c)
{
if (G.telwish == WILL)
- putiac2(DONT, c);
+ put_iac2(DONT, c);
else if (G.telwish == DO)
- putiac2(WONT, c);
+ put_iac2(WONT, c);
}
static void to_echo(void)
{
/* if server requests ECHO, don't agree */
if (G.telwish == DO) {
- putiac2(WONT, TELOPT_ECHO);
+ put_iac2(WONT, TELOPT_ECHO);
return;
}
if (G.telwish == DONT)
G.telflags ^= UF_ECHO;
if (G.telflags & UF_ECHO)
- putiac2(DO, TELOPT_ECHO);
+ put_iac2(DO, TELOPT_ECHO);
else
- putiac2(DONT, TELOPT_ECHO);
+ put_iac2(DONT, TELOPT_ECHO);
setConMode();
write_str(1, "\r\n"); /* sudden modec */
} else if (G.telwish == WONT)
return;
- if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
- putiac2(DO, TELOPT_SGA);
+ G.telflags ^= UF_SGA; /* toggle */
+ if (G.telflags & UF_SGA)
+ put_iac2(DO, TELOPT_SGA);
else
- putiac2(DONT, TELOPT_SGA);
+ put_iac2(DONT, TELOPT_SGA);
}
#if ENABLE_FEATURE_TELNET_TTYPE
/* Tell server we will (or won't) do TTYPE */
if (G.ttype)
- putiac2(WILL, TELOPT_TTYPE);
+ put_iac2(WILL, TELOPT_TTYPE);
else
- putiac2(WONT, TELOPT_TTYPE);
+ put_iac2(WONT, TELOPT_TTYPE);
}
#endif
/* Tell server we will (or will not) do AUTOLOGIN */
if (G.autologin)
- putiac2(WILL, TELOPT_NEW_ENVIRON);
+ put_iac2(WILL, TELOPT_NEW_ENVIRON);
else
- putiac2(WONT, TELOPT_NEW_ENVIRON);
+ put_iac2(WONT, TELOPT_NEW_ENVIRON);
}
#endif
static void to_naws(void)
{
/* Tell server we will do NAWS */
- putiac2(WILL, TELOPT_NAWS);
+ put_iac2(WILL, TELOPT_NAWS);
}
#endif
#if ENABLE_FEATURE_AUTOWIDTH
case TELOPT_NAWS:
to_naws();
- putiac_naws(c, G.win_width, G.win_height);
+ put_iac_naws(c, G.win_width, G.win_height);
break;
#endif
default:
#if ENABLE_FEATURE_TELNET_TTYPE
else
if (c == TELOPT_TTYPE)
- putiac_subopt(TELOPT_TTYPE, G.ttype);
+ put_iac_subopt(TELOPT_TTYPE, G.ttype);
#endif
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
else
if (c == TELOPT_NEW_ENVIRON)
- putiac_subopt_autologin();
+ put_iac_subopt_autologin();
#endif
break;
case TS_SUB2:
return FALSE;
}
-static void fgotsig(int sig)
-{
- G.gotsig = sig;
-}
-
-
static void rawmode(void)
{
if (G.do_termios)
tcsetattr(0, TCSADRAIN, &G.termios_def);
}
-void BUG_telnet_globals_too_big(void);
+/* poll gives smaller (-70 bytes) code */
+#define USE_POLL 1
-int telnet_main(int argc, char** argv);
-int telnet_main(int argc, char** argv)
+int telnet_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int telnet_main(int argc UNUSED_PARAM, char **argv)
{
char *host;
int port;
int maxfd;
#endif
- if (sizeof(G) > sizeof(bb_common_bufsiz1))
- BUG_telnet_globals_too_big();
- /* memset(&G, 0, sizeof G); - already is */
+ INIT_G();
#if ENABLE_FEATURE_AUTOWIDTH
get_terminal_width_height(0, &G.win_width, &G.win_height);
cfmakeraw(&G.termios_raw);
}
- if (argc < 2)
- bb_show_usage();
-
#if ENABLE_FEATURE_TELNET_AUTOLOGIN
- if (1 & getopt32(argc, argv, "al:", &G.autologin))
+ if (1 & getopt32(argv, "al:", &G.autologin))
G.autologin = getenv("USER");
argv += optind;
#else
if (*argv) /* extra params?? */
bb_show_usage();
- G.netfd = create_and_connect_stream_or_die(host, port);
+ xmove_fd(create_and_connect_stream_or_die(host, port), netfd);
- setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
+ setsockopt(netfd, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
- signal(SIGINT, fgotsig);
+ signal(SIGINT, record_signo);
#ifdef USE_POLL
- ufds[0].fd = 0; ufds[1].fd = G.netfd;
+ ufds[0].fd = 0; ufds[1].fd = netfd;
ufds[0].events = ufds[1].events = POLLIN;
#else
FD_ZERO(&readfds);
- FD_SET(0, &readfds);
- FD_SET(G.netfd, &readfds);
- maxfd = G.netfd + 1;
+ FD_SET(STDIN_FILENO, &readfds);
+ FD_SET(netfd, &readfds);
+ maxfd = netfd + 1;
#endif
while (1) {
/* timeout */
case -1:
/* error, ignore and/or log something, bay go to loop */
- if (G.gotsig)
- conescape();
+ if (bb_got_signal)
+ con_escape();
else
sleep(1);
break;
default:
#ifdef USE_POLL
- if (ufds[0].revents) /* well, should check POLLIN, but ... */
+ if (ufds[0].revents)
#else
- if (FD_ISSET(0, &rfds))
+ if (FD_ISSET(STDIN_FILENO, &rfds))
#endif
{
- len = read(0, G.buf, DATABUFSIZE);
+ len = safe_read(STDIN_FILENO, G.buf, DATABUFSIZE);
if (len <= 0)
- doexit(0);
+ doexit(EXIT_SUCCESS);
TRACE(0, ("Read con: %d\n", len));
- handlenetoutput(len);
+ handle_net_output(len);
}
#ifdef USE_POLL
- if (ufds[1].revents) /* well, should check POLLIN, but ... */
+ if (ufds[1].revents)
#else
- if (FD_ISSET(G.netfd, &rfds))
+ if (FD_ISSET(netfd, &rfds))
#endif
{
- len = read(G.netfd, G.buf, DATABUFSIZE);
+ len = safe_read(netfd, G.buf, DATABUFSIZE);
if (len <= 0) {
write_str(1, "Connection closed by foreign host\r\n");
- doexit(1);
+ doexit(EXIT_FAILURE);
}
- TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
- handlenetinput(len);
+ TRACE(0, ("Read netfd (%d): %d\n", netfd, len));
+ handle_net_input(len);
}
}
- }
+ } /* while (1) */
}
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