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console.c
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console.c
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/* CONSOLE.C (c)Copyright Roger Bowler, 1999-2003 */
/* ESA/390 Console Device Handler */
/*-------------------------------------------------------------------*/
/* This module contains device handling functions for console */
/* devices for the Hercules ESA/390 emulator. */
/* */
/* Telnet support is provided for two classes of console device: */
/* - local non-SNA 3270 display consoles via tn3270 */
/* - local non-SNA 3270 printers via tn3270 */
/* - 1052 and 3215 console printer keyboards via regular telnet */
/*-------------------------------------------------------------------*/
/*-------------------------------------------------------------------*/
/* This module also takes care of the differences between the */
/* remote 3270 and local non-SNA 3270 devices. In particular */
/* the support of command chaining, which is not supported on */
/* the remote 3270 implementation on which telnet 3270 is based. */
/* In the local non-SNA environment a chained read or write will */
/* continue at the buffer address where the previous command ended. */
/* In order to achieve this, this module will keep track of the */
/* buffer location, and adjust the buffer address on chained read */
/* and write operations. */
/* 03/06/00 Jan Jaeger. */
/*-------------------------------------------------------------------*/
/*-------------------------------------------------------------------*/
/* Add code to bypass bug in telnet client from TCP/IP for OS/390 */
/* where telnet responds with the server response rather then the */
/* client response as documented in RFC1576. */
/* 20/06/00 Jan Jaeger. */
/*-------------------------------------------------------------------*/
/*-------------------------------------------------------------------*/
/* Corrections to buffer position calculations in find_buffer_pos */
/* and get_screen_pos subroutines (symptom: message IEE305I) */
/* 09/12/00 Roger Bowler. */
/*-------------------------------------------------------------------*/
/*-------------------------------------------------------------------*/
/* When using VTAM with local non-SNA 3270 devices, ensure that */
/* enough bufferspace is available when doing IND$FILE type */
/* filetransfers. Code IOBUF=(,3992) in ATCSTRxx, and/or BUFNUM=xxx */
/* on the LBUILD LOCAL statement defining the 3270 device. JJ */
/* */
/*-------------------------------------------------------------------*/
#include "hercules.h"
#include "devtype.h"
#include "opcode.h"
#if defined(OPTION_DYNAMIC_LOAD) && defined(WIN32) && !defined(HDL_USE_LIBTOOL)
SYSBLK *psysblk;
#define sysblk (*psysblk)
#define config_cnslport (*config_cnslport)
static
#else
extern
#endif
char *config_cnslport;
/*-------------------------------------------------------------------*/
/* Telnet command definitions */
/*-------------------------------------------------------------------*/
#define BINARY 0 /* Binary Transmission */
#define IS 0 /* Used by terminal-type negotiation */
#define SEND 1 /* Used by terminal-type negotiation */
#define ECHO_OPTION 1 /* Echo option */
#define SUPPRESS_GA 3 /* Suppress go-ahead option */
#define TIMING_MARK 6 /* Timing mark option */
#define TERMINAL_TYPE 24 /* Terminal type option */
#define EOR 25 /* End of record option */
#define EOR_MARK 239 /* End of record marker */
#define SE 240 /* End of subnegotiation parameters */
#define NOP 241 /* No operation */
#define DATA_MARK 242 /* The data stream portion of a Synch.
This should always be accompanied
by a TCP Urgent notification */
#define BRK 243 /* Break character */
#define IP 244 /* Interrupt Process */
#define AO 245 /* Abort Output */
#define AYT 246 /* Are You There */
#define EC 247 /* Erase character */
#define EL 248 /* Erase Line */
#define GA 249 /* Go ahead */
#define SB 250 /* Subnegotiation of indicated option */
#define WILL 251 /* Indicates the desire to begin
performing, or confirmation that
you are now performing, the
indicated option */
#define WONT 252 /* Indicates the refusal to perform,
or continue performing, the
indicated option */
#define DO 253 /* Indicates the request that the
other party perform, or
confirmation that you are expecting
the other party to perform, the
indicated option */
#define DONT 254 /* Indicates the demand that the
other party stop performing,
or confirmation that you are no
longer expecting the other party
to perform, the indicated option */
#define IAC 255 /* Interpret as Command */
/*-------------------------------------------------------------------*/
/* 3270 definitions */
/*-------------------------------------------------------------------*/
/* 3270 local commands (CCWs) */
#define L3270_EAU 0x0F /* Erase All Unprotected */
#define L3270_EW 0x05 /* Erase/Write */
#define L3270_EWA 0x0D /* Erase/Write Alternate */
#define L3270_RB 0x02 /* Read Buffer */
#define L3270_RM 0x06 /* Read Modified */
#define L3270_WRT 0x01 /* Write */
#define L3270_WSF 0x11 /* Write Structured Field */
#define L3270_NOP 0x03 /* No Operation */
#define L3270_SELRM 0x0B /* Select RM */
#define L3270_SELRB 0x1B /* Select RB */
#define L3270_SELRMP 0x2B /* Select RMP */
#define L3270_SELRBP 0x3B /* Select RBP */
#define L3270_SELWRT 0x4B /* Select WRT */
#define L3270_SENSE 0x04 /* Sense */
#define L3270_SENSEID 0xE4 /* Sense ID */
/* 3270 remote commands */
#define R3270_EAU 0x6F /* Erase All Unprotected */
#define R3270_EW 0xF5 /* Erase/Write */
#define R3270_EWA 0x7E /* Erase/Write Alternate */
#define R3270_RB 0xF2 /* Read Buffer */
#define R3270_RM 0xF6 /* Read Modified */
#define R3270_RMA 0x6E /* Read Modified All */
#define R3270_WRT 0xF1 /* Write */
#define R3270_WSF 0xF3 /* Write Structured Field */
/* 3270 orders */
#define O3270_SBA 0x11 /* Set Buffer Address */
#define O3270_SF 0x1D /* Start Field */
#define O3270_SFE 0x29 /* Start Field Extended */
#define O3270_SA 0x28 /* Set Attribute */
#define O3270_IC 0x13 /* Insert Cursor */
#define O3270_MF 0x2C /* Modify Field */
#define O3270_PT 0x05 /* Program Tab */
#define O3270_RA 0x3C /* Repeat to Address */
#define O3270_EUA 0x12 /* Erase Unprotected to Addr */
#define O3270_GE 0x08 /* Graphic Escape */
/* Inbound structured fields */
#define SF3270_AID 0x88 /* Aid value of inbound SF */
#define SF3270_3270DS 0x80 /* SFID of 3270 datastream SF*/
/* 12 bit 3270 buffer address code conversion table */
static BYTE sba_code[] = { "\x40\xC1\xC2\xC3\xC4\xC5\xC6\xC7"
"\xC8\xC9\x4A\x4B\x4C\x4D\x4E\x4F"
"\x50\xD1\xD2\xD3\xD4\xD5\xD6\xD7"
"\xD8\xD9\x5A\x5B\x5C\x5D\x5E\x5F"
"\x60\x61\xE2\xE3\xE4\xE5\xE6\xE7"
"\xE8\xE9\x6A\x6B\x6C\x6D\x6E\x6F"
"\xF0\xF1\xF2\xF3\xF4\xF5\xF6\xF7"
"\xF8\xF9\x7A\x7B\x7C\x7D\x7E\x7F" };
/*-------------------------------------------------------------------*/
/* Internal macro definitions */
/*-------------------------------------------------------------------*/
#define DEBUG_LVL 0 /* 1 = status
2 = headers
3 = buffers */
#if DEBUG_LVL == 0
#define TNSDEBUG1(_format, _args...)
#define TNSDEBUG2(_format, _args...)
#define TNSDEBUG3(_format, _args...)
#endif
#if DEBUG_LVL == 1
#define TNSDEBUG1(_format, _args...) \
logmsg("console: " _format, ## _args)
#define TNSDEBUG2(_format, _args...)
#define TNSDEBUG3(_format, _args...)
#endif
#if DEBUG_LVL == 2
#define TNSDEBUG1(_format, _args...) \
logmsg("console: " _format, ## _args)
#define TNSDEBUG2(_format, _args...) \
logmsg("console: " _format, ## _args)
#define TNSDEBUG3(_format, _args...)
#endif
#if DEBUG_LVL == 3
#define TNSDEBUG1(_format, _args...) \
logmsg("console: " _format, ## _args)
#define TNSDEBUG2(_format, _args...) \
logmsg("console: " _format, ## _args)
#define TNSDEBUG3(_format, _args...) \
logmsg("console: " _format, ## _args)
#endif
#define TNSERROR(_format,_args...) \
logmsg("console: " _format, ## _args)
#define BUFLEN_3270 65536 /* 3270 Send/Receive buffer */
#define BUFLEN_1052 150 /* 1052 Send/Receive buffer */
#define SPACE ((BYTE)' ')
#undef FIX_QWS_BUG_FOR_MCS_CONSOLES
/*-------------------------------------------------------------------*/
/* Static data areas */
/*-------------------------------------------------------------------*/
static struct utsname hostinfo; /* Host info for this system */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO TRACE THE CONTENTS OF AN ASCII MESSAGE PACKET */
/*-------------------------------------------------------------------*/
#if DEBUG_LVL == 3
static void
packet_trace(BYTE *addr, int len)
{
unsigned int i, offset;
unsigned char c;
unsigned char print_chars[17];
for (offset=0; offset < len; )
{
memset(print_chars,0,sizeof(print_chars));
logmsg("+%4.4X ", offset);
for (i=0; i < 16; i++)
{
c = *addr++;
if (offset < len) {
logmsg("%2.2X", c);
print_chars[i] = '.';
if (isprint(c)) print_chars[i] = c;
c = guest_to_host(c);
if (isprint(c)) print_chars[i] = c;
}
else {
logmsg(" ");
}
offset++;
if ((offset & 3) == 0) {
logmsg(" ");
}
} /* end for(i) */
logmsg(" %s\n", print_chars);
} /* end for(offset) */
} /* end function packet_trace */
#else
#define packet_trace( _addr, _len)
#endif
#if 1
struct sockaddr_in * get_inet_socket(char *host_serv)
{
char *host = NULL;
char *serv;
struct sockaddr_in *sin;
if((serv = strchr(host_serv,':')))
{
*serv++ = '\0';
if(*host_serv)
host = host_serv;
}
else
serv = host_serv;
if(!(sin = malloc(sizeof(struct sockaddr_in))))
return sin;
sin->sin_family = AF_INET;
if(host)
{
struct hostent *hostent;
hostent = gethostbyname(host);
if(!hostent)
{
logmsg(_("HHCGI001I Unable to determine IP address from %s\n"),
host);
free(sin);
return NULL;
}
memcpy(&sin->sin_addr,*hostent->h_addr_list,sizeof(sin->sin_addr));
}
else
sin->sin_addr.s_addr = INADDR_ANY;
if(serv)
{
if(!isdigit(*serv))
{
struct servent *servent;
servent = getservbyname(serv, "tcp");
if(!servent)
{
logmsg(_("HHCGI002I Unable to determine port number from %s\n"),
host);
free(sin);
return NULL;
}
sin->sin_port = servent->s_port;
}
else
sin->sin_port = htons(atoi(serv));
}
else
{
logmsg(_("HHCGI003E Invalid parameter: %s\n"),
host_serv);
free(sin);
return NULL;
}
return sin;
}
#endif
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO REMOVE ANY IAC SEQUENCES FROM THE DATA STREAM */
/* Returns the new length after deleting IAC commands */
/*-------------------------------------------------------------------*/
static int
remove_iac (BYTE *buf, int len)
{
int m, n, c;
for (m=0, n=0; m < len; ) {
/* Interpret IAC commands */
if (buf[m] == IAC) {
/* Treat IAC in last byte of buffer as IAC NOP */
c = (++m < len)? buf[m++] : NOP;
/* Process IAC command */
switch (c) {
case IAC: /* Insert single IAC in buffer */
buf[n++] = IAC;
break;
case BRK: /* Set ATTN indicator */
break;
case IP: /* Set SYSREQ indicator */
break;
case WILL: /* Skip option negotiation command */
case WONT:
case DO:
case DONT:
m++;
break;
case SB: /* Skip until IAC SE sequence found */
for (; m < len; m++) {
if (buf[m] != IAC) continue;
if (++m >= len) break;
if (buf[m] == SE) { m++; break; }
} /* end for */
default: /* Ignore NOP or unknown command */
break;
} /* end switch(c) */
} else {
/* Copy data bytes */
if (n < m) buf[n] = buf[m];
m++; n++;
}
} /* end for */
if (n < m) {
TNSDEBUG3("%d IAC bytes removed, newlen=%d\n", m-n, n);
packet_trace (buf, n);
}
return n;
} /* end function remove_iac */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO DOUBLE UP ANY IAC BYTES IN THE DATA STREAM */
/* Returns the new length after inserting extra IAC bytes */
/*-------------------------------------------------------------------*/
static int
double_up_iac (BYTE *buf, int len)
{
int m, n, x, newlen;
/* Count the number of IAC bytes in the data */
for (x=0, n=0; n < len; n++)
if (buf[n] == IAC) x++;
/* Exit if nothing to do */
if (x == 0) return len;
/* Insert extra IAC bytes backwards from the end of the buffer */
newlen = len + x;
TNSDEBUG3("%d IAC bytes added, newlen=%d\n", x, newlen);
for (n=newlen, m=len; n > m; ) {
buf[--n] = buf[--m];
if (buf[n] == IAC) buf[--n] = IAC;
}
packet_trace (buf, newlen);
return newlen;
} /* end function double_up_iac */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO TRANSLATE A NULL-TERMINATED STRING TO EBCDIC */
/*-------------------------------------------------------------------*/
static BYTE *
translate_to_ebcdic (BYTE *str)
{
int i; /* Array subscript */
BYTE c; /* Character work area */
for (i = 0; str[i] != '\0'; i++)
{
c = str[i];
str[i] = (isprint(c) ? host_to_guest(c) : SPACE);
}
return str;
} /* end function translate_to_ebcdic */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO SEND A DATA PACKET TO THE CLIENT */
/*-------------------------------------------------------------------*/
static int
send_packet (int csock, BYTE *buf, int len, char *caption)
{
int rc; /* Return code */
if (caption != NULL) {
TNSDEBUG2("Sending %s\n", caption);
packet_trace (buf, len);
}
rc = send (csock, buf, len, 0);
if (rc < 0) {
TNSERROR("send: %s\n", strerror(errno));
return -1;
} /* end if(rc) */
return 0;
} /* end function send_packet */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO RECEIVE A DATA PACKET FROM THE CLIENT */
/* This subroutine receives bytes from the client. It stops when */
/* the receive buffer is full, or when the last two bytes received */
/* consist of the IAC character followed by a specified delimiter. */
/* If zero bytes are received, this means the client has closed the */
/* connection, and this is treated as an error. */
/* Input: */
/* csock is the socket number */
/* buf points to area to receive data */
/* reqlen is the number of bytes requested */
/* delim is the delimiter character (0=no delimiter) */
/* Output: */
/* buf is updated with data received */
/* The return value is the number of bytes received, or */
/* -1 if an error occurred. */
/*-------------------------------------------------------------------*/
static int
recv_packet (int csock, BYTE *buf, int reqlen, BYTE delim)
{
int rc=0; /* Return code */
int rcvlen=0; /* Length of data received */
while (rcvlen < reqlen) {
rc = recv (csock, buf + rcvlen, reqlen - rcvlen, 0);
if (rc < 0) {
TNSERROR("recv: %s\n", strerror(errno));
return -1;
}
if (rc == 0) {
TNSDEBUG1("Connection closed by client\n");
return -1;
}
rcvlen += rc;
if (delim != '\0' && rcvlen >= 2
&& buf[rcvlen-2] == IAC && buf[rcvlen-1] == delim)
break;
}
TNSDEBUG2("Packet received length=%d\n", rcvlen);
packet_trace (buf, rcvlen);
return rcvlen;
} /* end function recv_packet */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO RECEIVE A PACKET AND COMPARE WITH EXPECTED VALUE */
/*-------------------------------------------------------------------*/
static int
expect (int csock, BYTE *expected, int len, char *caption)
{
int rc; /* Return code */
BYTE buf[512]; /* Receive buffer */
#if 1
/* TCP/IP for MVS returns the server sequence rather then
the client sequence during bin negotiation 19/06/00 Jan Jaeger */
static BYTE do_bin[] = { IAC, DO, BINARY, IAC, WILL, BINARY };
static BYTE will_bin[] = { IAC, WILL, BINARY, IAC, DO, BINARY };
#endif
UNREFERENCED(caption);
rc = recv_packet (csock, buf, len, 0);
if (rc < 0) return -1;
#if 1
/* TCP/IP FOR MVS DOES NOT COMPLY TO RFC 1576 THIS IS A BYPASS */
if(memcmp(buf, expected, len) != 0
&& !(len == sizeof(will_bin)
&& memcmp(expected, will_bin, len) == 0
&& memcmp(buf, do_bin, len) == 0) )
#else
if (memcmp(buf, expected, len) != 0)
#endif
{
TNSDEBUG2("Expected %s\n", caption);
return -1;
}
TNSDEBUG2("Received %s\n", caption);
return 0;
} /* end function expect */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO NEGOTIATE TELNET PARAMETERS */
/* This subroutine negotiates the terminal type with the client */
/* and uses the terminal type to determine whether the client */
/* is to be supported as a 3270 display console or as a 1052/3215 */
/* printer-keyboard console. */
/* */
/* Valid display terminal types are "IBM-NNNN", "IBM-NNNN-M", and */
/* "IBM-NNNN-M-E", where NNNN is 3270, 3277, 3278, 3279, 3178, 3179, */
/* or 3180, M indicates the screen size (2=25x80, 3=32x80, 4=43x80, */
/* 5=27x132, X=determined by Read Partition Query command), and */
/* -E is an optional suffix indicating that the terminal supports */
/* extended attributes. Displays are negotiated into tn3270 mode. */
/* An optional device number suffix (example: IBM-3270@01F) may */
/* be specified to request allocation to a specific device number. */
/* Valid 3270 printer type is "IBM-3287-1" */
/* */
/* Terminal types whose first four characters are not "IBM-" are */
/* handled as printer-keyboard consoles using telnet line mode. */
/* */
/* Input: */
/* csock Socket number for client connection */
/* Output: */
/* class D=3270 display console, K=printer-keyboard console */
/* P=3270 printer */
/* model 3270 model indicator (2,3,4,5,X) */
/* extatr 3270 extended attributes (Y,N) */
/* devn Requested device number, or FFFF=any device number */
/* Return value: */
/* 0=negotiation successful, -1=negotiation error */
/*-------------------------------------------------------------------*/
static int
negotiate(int csock, BYTE *class, BYTE *model, BYTE *extatr, U16 *devn)
{
int rc; /* Return code */
BYTE *termtype; /* Pointer to terminal type */
BYTE *s; /* String pointer */
U16 devnum; /* Requested device number */
BYTE buf[512]; /* Telnet negotiation buffer */
static BYTE do_term[] = { IAC, DO, TERMINAL_TYPE };
static BYTE will_term[] = { IAC, WILL, TERMINAL_TYPE };
static BYTE req_type[] = { IAC, SB, TERMINAL_TYPE, SEND, IAC, SE };
static BYTE type_is[] = { IAC, SB, TERMINAL_TYPE, IS };
static BYTE do_eor[] = { IAC, DO, EOR, IAC, WILL, EOR };
static BYTE will_eor[] = { IAC, WILL, EOR, IAC, DO, EOR };
static BYTE do_bin[] = { IAC, DO, BINARY, IAC, WILL, BINARY };
static BYTE will_bin[] = { IAC, WILL, BINARY, IAC, DO, BINARY };
#if 0
static BYTE do_tmark[] = { IAC, DO, TIMING_MARK };
static BYTE will_tmark[] = { IAC, WILL, TIMING_MARK };
static BYTE wont_sga[] = { IAC, WONT, SUPPRESS_GA };
static BYTE dont_sga[] = { IAC, DONT, SUPPRESS_GA };
#endif
static BYTE wont_echo[] = { IAC, WONT, ECHO_OPTION };
static BYTE dont_echo[] = { IAC, DONT, ECHO_OPTION };
/* Perform terminal-type negotiation */
rc = send_packet (csock, do_term, sizeof(do_term),
"IAC DO TERMINAL_TYPE");
if (rc < 0) return -1;
rc = expect (csock, will_term, sizeof(will_term),
"IAC WILL TERMINAL_TYPE");
if (rc < 0) return -1;
/* Request terminal type */
rc = send_packet (csock, req_type, sizeof(req_type),
"IAC SB TERMINAL_TYPE SEND IAC SE");
if (rc < 0) return -1;
rc = recv_packet (csock, buf, sizeof(buf)-2, SE);
if (rc < 0) return -1;
if (rc < (int)(sizeof(type_is) + 2)
|| memcmp(buf, type_is, sizeof(type_is)) != 0
|| buf[rc-2] != IAC || buf[rc-1] != SE) {
TNSDEBUG2("Expected IAC SB TERMINAL_TYPE IS\n");
return -1;
}
buf[rc-2] = '\0';
termtype = buf + sizeof(type_is);
TNSDEBUG2("Received IAC SB TERMINAL_TYPE IS %s IAC SE\n",
termtype);
/* Check terminal type string for device name suffix */
s = strchr (termtype, '@');
if (s != NULL && sscanf (s, "@%hx", &devnum) == 1)
*devn = devnum;
else
*devn = 0xFFFF;
/* Test for non-display terminal type */
if (memcmp(termtype, "IBM-", 4) != 0)
{
#if 0
/* Perform line mode negotiation */
rc = send_packet (csock, do_tmark, sizeof(do_tmark),
"IAC DO TIMING_MARK");
if (rc < 0) return -1;
rc = expect (csock, will_tmark, sizeof(will_tmark),
"IAC WILL TIMING_MARK");
if (rc < 0) return 0;
rc = send_packet (csock, wont_sga, sizeof(wont_sga),
"IAC WONT SUPPRESS_GA");
if (rc < 0) return -1;
rc = expect (csock, dont_sga, sizeof(dont_sga),
"IAC DONT SUPPRESS_GA");
if (rc < 0) return -1;
#endif
if (memcmp(termtype, "ANSI", 4) == 0)
{
rc = send_packet (csock, wont_echo, sizeof(wont_echo),
"IAC WONT ECHO");
if (rc < 0) return -1;
rc = expect (csock, dont_echo, sizeof(dont_echo),
"IAC DONT ECHO");
if (rc < 0) return -1;
}
/* Return printer-keyboard terminal class */
*class = 'K';
*model = '-';
*extatr = '-';
return 0;
}
/* Determine display terminal model */
if (memcmp(termtype+4,"DYNAMIC",7) == 0) {
*model = 'X';
*extatr = 'Y';
} else {
if (!(memcmp(termtype+4, "3277", 4) == 0
|| memcmp(termtype+4, "3270", 4) == 0
|| memcmp(termtype+4, "3178", 4) == 0
|| memcmp(termtype+4, "3278", 4) == 0
|| memcmp(termtype+4, "3179", 4) == 0
|| memcmp(termtype+4, "3180", 4) == 0
|| memcmp(termtype+4, "3287", 4) == 0
|| memcmp(termtype+4, "3279", 4) == 0))
return -1;
*model = '2';
*extatr = 'N';
if (termtype[8]=='-') {
if (termtype[9] < '1' || termtype[9] > '5')
return -1;
*model = termtype[9];
if (memcmp(termtype+4, "328",3) == 0) *model = '2';
if (memcmp(termtype+10, "-E", 2) == 0)
*extatr = 'Y';
}
}
/* Perform end-of-record negotiation */
rc = send_packet (csock, do_eor, sizeof(do_eor),
"IAC DO EOR IAC WILL EOR");
if (rc < 0) return -1;
rc = expect (csock, will_eor, sizeof(will_eor),
"IAC WILL EOR IAC DO EOR");
if (rc < 0) return -1;
/* Perform binary negotiation */
rc = send_packet (csock, do_bin, sizeof(do_bin),
"IAC DO BINARY IAC WILL BINARY");
if (rc < 0) return -1;
rc = expect (csock, will_bin, sizeof(will_bin),
"IAC WILL BINARY IAC DO BINARY");
if (rc < 0) return -1;
/* Return display terminal class */
if (memcmp(termtype+4,"3287",4)==0) *class='P';
else *class = 'D';
return 0;
} /* end function negotiate */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO RECEIVE 3270 DATA FROM THE CLIENT */
/* This subroutine receives bytes from the client and appends them */
/* to any data already in the 3270 receive buffer. */
/* If zero bytes are received, this means the client has closed the */
/* connection, and attention and unit check status is returned. */
/* If the buffer is filled before receiving end of record, then */
/* attention and unit check status is returned. */
/* If the data ends with IAC followed by EOR_MARK, then the data */
/* is scanned to remove any IAC sequences, attention status is */
/* returned, and the read pending indicator is set. */
/* If the data accumulated in the buffer does not yet constitute a */
/* complete record, then zero status is returned, and a further */
/* call must be made to this subroutine when more data is available. */
/*-------------------------------------------------------------------*/
static BYTE
recv_3270_data (DEVBLK *dev)
{
int rc; /* Return code */
int eor = 0; /* 1=End of record received */
/* If there is a complete data record already in the buffer
then discard it before reading more data */
if (dev->readpending)
{
dev->rlen3270 = 0;
dev->readpending = 0;
}
/* Receive bytes from client */
rc = recv (dev->fd, dev->buf + dev->rlen3270,
BUFLEN_3270 - dev->rlen3270, 0);
if (rc < 0) {
TNSERROR("recv: %s\n", strerror(errno));
dev->sense[0] = SENSE_EC;
return (CSW_ATTN | CSW_UC);
}
/* If zero bytes were received then client has closed connection */
if (rc == 0) {
logmsg (_("HHCTE007I Device %4.4X connection closed by client %s\n"),
dev->devnum, inet_ntoa(dev->ipaddr));
dev->sense[0] = SENSE_IR;
return (CSW_ATTN | CSW_UC | CSW_DE);
}
/* Update number of bytes in receive buffer */
dev->rlen3270 += rc;
/* Check whether Attn indicator was received */
if (dev->rlen3270 >= 2
&& dev->buf[dev->rlen3270 - 2] == IAC
&& dev->buf[dev->rlen3270 - 1] == BRK)
eor = 1;
/* Check whether SysRq indicator was received */
if (dev->rlen3270 >= 2
&& dev->buf[dev->rlen3270 - 2] == IAC
&& dev->buf[dev->rlen3270 - 1] == IP)
eor = 1;
/* Check whether end of record marker was received */
if (dev->rlen3270 >= 2
&& dev->buf[dev->rlen3270 - 2] == IAC
&& dev->buf[dev->rlen3270 - 1] == EOR_MARK)
eor = 1;
/* If record is incomplete, test for buffer full */
if (eor == 0 && dev->rlen3270 >= BUFLEN_3270)
{
TNSDEBUG1("3270 buffer overflow\n");
dev->sense[0] = SENSE_DC;
return (CSW_ATTN | CSW_UC);
}
/* Return zero status if record is incomplete */
if (eor == 0) return 0;
/* Trace the complete 3270 data packet */
TNSDEBUG2("Packet received length=%d\n", dev->rlen3270);
packet_trace (dev->buf, dev->rlen3270);
/* Strip off the telnet EOR marker */
dev->rlen3270 -= 2;
/* Remove any embedded IAC commands */
dev->rlen3270 = remove_iac (dev->buf, dev->rlen3270);
/* Set the read pending indicator and return attention status */
dev->readpending = 1;
return (CSW_ATTN);
} /* end function recv_3270_data */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO SOLICIT 3270 DATA FROM THE CLIENT */
/* This subroutine sends a Read or Read Modified command to the */
/* client and then receives the data into the 3270 receive buffer. */
/* This subroutine is called by loc3270_execute_ccw as a result of */
/* processing a Read Buffer CCW, or a Read Modified CCW when no */
/* data is waiting in the 3270 read buffer. It waits until the */
/* client sends end of record. Certain tn3270 clients fail to */
/* flush their buffer until the user presses an attention key; */
/* these clients cause this routine to hang and are not supported. */
/* Since this routine is only called while a channel program is */
/* active on the device, we can rely on the dev->busy flag to */
/* prevent the connection thread from issuing a read and capturing */
/* the incoming data intended for this routine. */
/* The caller MUST hold the device lock. */
/* Returns zero status if successful, or unit check if error. */
/*-------------------------------------------------------------------*/
static BYTE
solicit_3270_data (DEVBLK *dev, BYTE cmd)
{
int rc; /* Return code */
int len; /* Data length */
BYTE buf[32]; /* tn3270 write buffer */
/* Clear the inbound buffer of any unsolicited
data accumulated by the connection thread */
dev->rlen3270 = 0;
dev->readpending = 0;
/* Construct a 3270 read command in the outbound buffer */
len = 0;
buf[len++] = cmd;
/* Append telnet EOR marker to outbound buffer */
buf[len++] = IAC;
buf[len++] = EOR_MARK;
/* Send the 3270 read command to the client */
rc = send_packet(dev->fd, buf, len, "3270 Read Command");
if (rc < 0)
{
dev->sense[0] = SENSE_DC;
return (CSW_UC);
}
/* Receive response data from the client */
do {
len = dev->rlen3270;
rc = recv_3270_data (dev);
TNSDEBUG2("read buffer: %d bytes received\n",
dev->rlen3270 - len);
} while(rc == 0);
/* Close the connection if an error occurred */
if (rc & CSW_UC)
{
dev->connected = 0;
dev->fd = -1;
dev->sense[0] = SENSE_DC;
return (CSW_UC);
}
/* Return zero status to indicate response received */
return 0;
} /* end function solicit_3270_data */
/*-------------------------------------------------------------------*/
/* SUBROUTINE TO RECEIVE 1052/3215 DATA FROM THE CLIENT */
/* This subroutine receives keyboard input characters from the */
/* client, and appends the characters to any data already in the */
/* keyboard buffer. */
/* If zero bytes are received, this means the client has closed the */
/* connection, and attention and unit check status is returned. */
/* If the buffer is filled before receiving end of record, then */
/* attention and unit check status is returned. */
/* If a break indication (control-C, IAC BRK, or IAC IP) is */
/* received, the attention and unit exception status is returned. */
/* When carriage return and line feed (CRLF) is received, then */
/* the CRLF is discarded, the data in the keyboard buffer is */
/* translated to EBCDIC, the read pending indicator is set, and */
/* attention status is returned. */
/* If CRLF has not yet been received, then zero status is returned, */
/* and a further call must be made to this subroutine when more */
/* data is available. */
/*-------------------------------------------------------------------*/
static BYTE
recv_1052_data (DEVBLK *dev)
{
int num; /* Number of bytes received */
int i; /* Array subscript */
BYTE buf[BUFLEN_1052]; /* Receive buffer */
BYTE c; /* Character work area */
/* Receive bytes from client */
num = recv (dev->fd, buf, BUFLEN_1052, 0);
/* Return unit check if error on receive */
if (num < 0) {
TNSERROR("recv: %s\n", strerror(errno));
dev->sense[0] = SENSE_EC;
return (CSW_ATTN | CSW_UC);
}
/* If zero bytes were received then client has closed connection */
if (num == 0) {
logmsg (_("HHCTE008I Device %4.4X connection closed by client %s\n"),
dev->devnum, inet_ntoa(dev->ipaddr));
dev->sense[0] = SENSE_IR;
return (CSW_ATTN | CSW_UC);
}
/* Trace the bytes received */
TNSDEBUG2("Bytes received length=%d\n", num);
packet_trace (buf, num);
/* Copy received bytes to keyboard buffer */
for (i = 0; i < num; i++)
{
/* Decrement keyboard buffer pointer if backspace received */
if (buf[i] == 0x08)
{
if (dev->keybdrem > 0) dev->keybdrem--;
continue;
}
/* Return unit exception if control-C received */
if (buf[i] == 0x03)
{
dev->keybdrem = 0;
return (CSW_ATTN | CSW_UX);
}
/* Return unit check if buffer is full */
if (dev->keybdrem >= BUFLEN_1052)
{
TNSDEBUG1("Console keyboard buffer overflow\n");
dev->keybdrem = 0;
dev->sense[0] = SENSE_EC;
return (CSW_ATTN | CSW_UC);
}
/* Copy character to keyboard buffer */
dev->buf[dev->keybdrem++] = buf[i];
/* Decrement keyboard buffer pointer if telnet
erase character sequence received */
if (dev->keybdrem >= 2
&& dev->buf[dev->keybdrem - 2] == IAC
&& dev->buf[dev->keybdrem - 1] == EC)
{
dev->keybdrem -= 2;
if (dev->keybdrem > 0) dev->keybdrem--;
continue;
}
/* Zeroize keyboard buffer pointer if telnet
erase line sequence received */
if (dev->keybdrem >= 2
&& dev->buf[dev->keybdrem - 2] == IAC
&& dev->buf[dev->keybdrem - 1] == EL)
{
dev->keybdrem = 0;
continue;