* HISTORY
* Revision 3.1 1994/04/17 11:31:54 too
* initial revision
- * Modified 2000/06/13 for inclusion into BusyBox by Erik Andersen
- * <andersen@lineo.com>
+ * 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>
*
*/
-#warning This applet has moved to netkit-tiny. After BusyBox 0.49, this
-#warning applet will be removed from BusyBox. All maintenance efforts
-#warning should be done in the netkit-tiny source tree.
-
-
-#include "busybox.h"
#include <termios.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
-#include <netdb.h>
+#include "busybox.h"
#if 0
static const int DOTRACE = 1;
#include <arpa/inet.h> /* for inet_ntoa()... */
#define TRACE(x, y) do { if (x) printf y; } while (0)
#else
-#define TRACE(x, y)
+#define TRACE(x, y)
#endif
#if 0
#include <sys/time.h>
#endif
-static const int DATABUFSIZE = 128;
-static const int IACBUFSIZE = 128;
+#define DATABUFSIZE 128
+#define IACBUFSIZE 128
static const int CHM_TRY = 0;
static const int CHM_ON = 1;
typedef unsigned char byte;
/* use globals to reduce size ??? */ /* test this hypothesis later */
-struct Globalvars {
+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; /* allocating so static size is smaller */
- short len;
+ char buf[DATABUFSIZE]; /* allocating so static size is smaller */
byte telstate; /* telnet negotiation state from network input */
byte telwish; /* DO, DONT, WILL, WONT */
byte charmode;
byte telflags;
byte gotsig;
/* buffer to handle telnet negotiations */
- char * iacbuf;
+ char iacbuf[IACBUFSIZE];
short iaclen; /* could even use byte */
- struct termios termios_def;
- struct termios termios_raw;
+ 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)
-#else
-struct Globalvars G;
#endif
-static inline void iacflush()
+static inline void iacflush(void)
{
write(G.netfd, G.iacbuf, G.iaclen);
G.iaclen = 0;
}
/* Function prototypes */
-static int getport(char * p);
-static struct in_addr getserver(char * p);
-static int create_socket();
-static void setup_sockaddr_in(struct sockaddr_in * addr, int port);
-static int remote_connect(struct in_addr addr, int port);
-static void rawmode();
-static void cookmode();
-static void do_linemode();
-static void will_charmode();
+static void rawmode(void);
+static void cookmode(void);
+static void do_linemode(void);
+static void will_charmode(void);
static void telopt(byte c);
static int subneg(byte c);
-#if 0
-static int local_bind(int port);
-#endif
/* Some globals */
static int one = 1;
+#ifdef CONFIG_FEATURE_TELNET_TTYPE
+static char *ttype;
+#endif
+
+#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
+static char *autologin;
+#endif
+
+#ifdef CONFIG_FEATURE_AUTOWIDTH
+static int win_width, win_height;
+#endif
+
static void doexit(int ev)
{
cookmode();
exit(ev);
-}
+}
-static void conescape()
+static void conescape(void)
{
char b;
if (G.gotsig)
cookmode();
-
+
rrturn:
G.gotsig = 0;
-
+
}
-static void handlenetoutput()
+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 */
-
- int i;
+ * 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.
+ */
+
+ int i, j;
byte * p = G.buf;
+ byte outbuf[4*DATABUFSIZE];
- for (i = G.len; i > 0; i--, p++)
+ for (i = len, j = 0; i > 0; i--, p++)
{
if (*p == 0x1d)
{
conescape();
return;
}
+ outbuf[j++] = *p;
if (*p == 0xff)
- *p = 0x7f;
+ outbuf[j++] = 0xff;
+ else if (*p == 0x0d)
+ outbuf[j++] = 0x00;
}
- write(G.netfd, G.buf, G.len);
+ if (j > 0 )
+ write(G.netfd, outbuf, j);
}
-static void handlenetinput()
+static void handlenetinput(int len)
{
int i;
int cstart = 0;
- for (i = 0; i < G.len; i++)
+ for (i = 0; i < len; i++)
{
byte c = G.buf[i];
break;
case TS_SUB1: /* Subnegotiation */
case TS_SUB2: /* Subnegotiation */
- if (subneg(c) == TRUE)
+ if (subneg(c))
G.telstate = TS_0;
break;
}
if (G.iaclen) iacflush();
if (G.telstate == TS_0) G.telstate = 0;
- G.len = cstart;
+ len = cstart;
}
- if (G.len)
- write(1, G.buf, G.len);
+ if (len)
+ write(1, G.buf, len);
}
}
#endif
+#ifdef CONFIG_FEATURE_TELNET_TTYPE
+static void putiac_subopt(byte c, char *str)
+{
+ int len = strlen(str) + 6; // ( 2 + 1 + 1 + strlen + 2 )
+
+ if (G.iaclen + len > IACBUFSIZE)
+ iacflush();
+
+ putiac(IAC);
+ putiac(SB);
+ putiac(c);
+ putiac(0);
+
+ while(*str)
+ putiac(*str++);
+
+ putiac(IAC);
+ putiac(SE);
+}
+#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)
+{
+ if (G.iaclen + 9 > IACBUFSIZE)
+ iacflush();
+
+ putiac(IAC);
+ putiac(SB);
+ putiac(c);
+
+ putiac((x >> 8) & 0xff);
+ putiac(x & 0xff);
+ putiac((y >> 8) & 0xff);
+ putiac(y & 0xff);
+
+ putiac(IAC);
+ putiac(SE);
+}
+#endif
+
/* void putiacstring (subneg strings) */
/* ******************************* */
-char const escapecharis[] = "\r\nEscape character is ";
+static char const escapecharis[] = "\r\nEscape character is ";
-static void setConMode()
+static void setConMode(void)
{
if (G.telflags & UF_ECHO)
{
/* ******************************* */
-static void will_charmode()
+static void will_charmode(void)
{
G.charmode = CHM_TRY;
G.telflags |= (UF_ECHO | UF_SGA);
setConMode();
-
+
putiac2(DO, TELOPT_ECHO);
putiac2(DO, TELOPT_SGA);
iacflush();
}
-static void do_linemode()
+static void do_linemode(void)
{
G.charmode = CHM_TRY;
G.telflags &= ~(UF_ECHO | UF_SGA);
else if (G.telwish == DO) putiac2(WONT, c);
}
-static inline void to_echo()
+static inline 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.telflags & UF_ECHO)
{
if (G.telwish == WILL)
WriteCS(1, "\r\n"); /* sudden modec */
}
-static inline void to_sga()
+static inline void to_sga(void)
{
/* daemon always sends will/wont, client do/dont */
else
if (G.telwish == WONT)
return;
-
+
if ((G.telflags ^= UF_SGA) & UF_SGA) /* toggle */
putiac2(DO, TELOPT_SGA);
else
return;
}
+#ifdef CONFIG_FEATURE_TELNET_TTYPE
+static inline void to_ttype(void)
+{
+ /* Tell server we will (or won't) do TTYPE */
+
+ if(ttype)
+ putiac2(WILL, TELOPT_TTYPE);
+ else
+ putiac2(WONT, TELOPT_TTYPE);
+
+ return;
+}
+#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)
+{
+ /* Tell server we will do NAWS */
+ putiac2(WILL, TELOPT_NAWS);
+ return;
+}
+#endif
+
static void telopt(byte c)
{
switch (c)
{
- case TELOPT_ECHO: to_echo(c); break;
- case TELOPT_SGA: to_sga(c); break;
- default: to_notsup(c); break;
+ case TELOPT_ECHO: to_echo(); break;
+ case TELOPT_SGA: to_sga(); break;
+#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);
+ break;
+#endif
+ default: to_notsup(c);
+ break;
}
}
/* ******************************* */
-/* subnegotiation -- ignore all */
+/* subnegotiation -- ignore all (except TTYPE,NAWS) */
static int subneg(byte c)
{
case TS_SUB1:
if (c == IAC)
G.telstate = TS_SUB2;
+#ifdef CONFIG_FEATURE_TELNET_TTYPE
+ 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:
if (c == SE)
}
-static void rawmode()
+static void rawmode(void)
{
tcsetattr(0, TCSADRAIN, &G.termios_raw);
-}
+}
-static void cookmode()
+static void cookmode(void)
{
tcsetattr(0, TCSADRAIN, &G.termios_def);
}
extern int telnet_main(int argc, char** argv)
{
- struct in_addr host;
- int port;
+ int len;
+ struct sockaddr_in s_in;
#ifdef USE_POLL
struct pollfd ufds[2];
-#else
+#else
fd_set readfds;
int maxfd;
-#endif
+#endif
+
+#ifdef CONFIG_FEATURE_TELNET_AUTOLOGIN
+ int opt;
+#endif
+#ifdef CONFIG_FEATURE_AUTOWIDTH
+ get_terminal_width_height(0, &win_width, &win_height);
+#endif
+
+#ifdef CONFIG_FEATURE_TELNET_TTYPE
+ ttype = getenv("TERM");
+#endif
memset(&G, 0, sizeof G);
if (tcgetattr(0, &G.termios_def) < 0)
exit(1);
-
- G.termios_raw = G.termios_def;
+ G.termios_raw = G.termios_def;
cfmakeraw(&G.termios_raw);
-
- if (argc < 2) usage(telnet_usage);
- port = (argc > 2)? getport(argv[2]): 23;
-
- G.buf = xmalloc(DATABUFSIZE);
- G.iacbuf = xmalloc(IACBUFSIZE);
-
- host = getserver(argv[1]);
- G.netfd = remote_connect(host, port);
+ 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);
+
+ setsockopt(G.netfd, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one);
signal(SIGINT, fgotsig);
#ifdef USE_POLL
ufds[0].fd = 0; ufds[1].fd = G.netfd;
ufds[0].events = ufds[1].events = POLLIN;
-#else
+#else
FD_ZERO(&readfds);
FD_SET(0, &readfds);
FD_SET(G.netfd, &readfds);
maxfd = G.netfd + 1;
#endif
-
+
while (1)
{
#ifndef USE_POLL
fd_set rfds = readfds;
-
+
switch (select(maxfd, &rfds, NULL, NULL, NULL))
#else
switch (poll(ufds, 2, -1))
-#endif
+#endif
{
case 0:
/* timeout */
#ifdef USE_POLL
if (ufds[0].revents) /* well, should check POLLIN, but ... */
-#else
+#else
if (FD_ISSET(0, &rfds))
-#endif
+#endif
{
- G.len = read(0, G.buf, DATABUFSIZE);
+ len = read(0, G.buf, DATABUFSIZE);
- if (G.len <= 0)
+ if (len <= 0)
doexit(0);
- TRACE(0, ("Read con: %d\n", G.len));
-
- handlenetoutput();
+ TRACE(0, ("Read con: %d\n", len));
+
+ handlenetoutput(len);
}
#ifdef USE_POLL
if (ufds[1].revents) /* well, should check POLLIN, but ... */
-#else
+#else
if (FD_ISSET(G.netfd, &rfds))
-#endif
+#endif
{
- G.len = read(G.netfd, G.buf, DATABUFSIZE);
+ len = read(G.netfd, G.buf, DATABUFSIZE);
- if (G.len <= 0)
+ if (len <= 0)
{
WriteCS(1, "Connection closed by foreign host.\r\n");
doexit(1);
}
- TRACE(0, ("Read netfd (%d): %d\n", G.netfd, G.len));
+ TRACE(0, ("Read netfd (%d): %d\n", G.netfd, len));
- handlenetinput();
+ handlenetinput(len);
}
}
}
}
-static int getport(char * p)
-{
- unsigned int port = atoi(p);
-
- if ((unsigned)(port - 1 ) > 65534)
- {
- error_msg_and_die("%s: bad port number\n", p);
- }
- return port;
-}
-
-static struct in_addr getserver(char * host)
-{
- struct in_addr addr;
-
- struct hostent * he;
- if ((he = gethostbyname(host)) == NULL)
- {
- error_msg_and_die("%s: Unknown host\n", host);
- }
- memcpy(&addr, he->h_addr, sizeof addr);
-
- TRACE(1, ("addr: %s\n", inet_ntoa(addr)));
-
- return addr;
-}
-
-static int create_socket()
-{
- return socket(AF_INET, SOCK_STREAM, 0);
-}
-
-static void setup_sockaddr_in(struct sockaddr_in * addr, int port)
-{
- memset(addr, 0, sizeof addr);
- addr->sin_family = AF_INET;
- addr->sin_port = htons(port);
-}
-
-#if 0
-static int local_bind(int port)
-{
- struct sockaddr_in s_addr;
- int s = create_socket();
-
- setup_sockaddr_in(&s_addr, port);
-
- setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &one, sizeof one);
-
- if (bind(s, &s_addr, sizeof s_addr) < 0)
- {
- char * e = sys_errlist[errno];
- syserrorexit("bind");
- exit(1);
- }
- listen(s, 1);
-
- return s;
-}
-#endif
-
-static int remote_connect(struct in_addr addr, int port)
-{
- struct sockaddr_in s_addr;
- int s = create_socket();
-
- setup_sockaddr_in(&s_addr, port);
- s_addr.sin_addr = addr;
-
- setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &one, sizeof one);
-
- if (connect(s, (struct sockaddr *)&s_addr, sizeof s_addr) < 0)
- {
- perror_msg_and_die("Unable to connect to remote host");
- }
- return s;
-}
-
/*
Local Variables:
c-file-style: "linux"
tab-width: 4
End:
*/
-
projects / oweals / busybox.git / blobdiff