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/* ========================================================================
* Copyright 2006-2007 University of Washington
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* ========================================================================
*/
#include <string.h>
#include <tcl.h>
#include <unistd.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#define VERSION "0.1"
#define READBUF 4096
#define RESULT_MAX 16
int append_rbuf(char *, char *, int);
int WPSendCmd(ClientData, Tcl_Interp *, int, Tcl_Obj *CONST []);
/*
* WPComm_Init - entry point for Web Alpine servlet communications.
*
* returns: TCL defined values for success or failure
*
*/
int
Wpcomm_Init(Tcl_Interp *interp)
{
if(Tcl_PkgRequire(interp, "Tcl", TCL_VERSION, 0) == NULL
&& TCL_VERSION[0] == '7'
&& Tcl_PkgRequire(interp, "Tcl", "8.0", 0) == NULL)
return TCL_ERROR;
if(Tcl_PkgProvide(interp, "WPComm", VERSION) != TCL_OK)
return TCL_ERROR;
Tcl_CreateObjCommand(interp, "WPSend", WPSendCmd,
(ClientData)NULL, (Tcl_CmdDeleteProc *)NULL);
return TCL_OK;
}
/*
* WPSendCmd - establish communication with the specified device,
* send the given command and return results to caller.
*
*/
int
WPSendCmd(ClientData clientData, Tcl_Interp *interp, int objc, Tcl_Obj *CONST objv[])
{
char buf[READBUF], lbuf[32], *errbuf = NULL, rbuf[RESULT_MAX], *fname, *cmd;
int s, i, n, b, rs, rv = TCL_ERROR, wlen;
struct sockaddr_un name;
Tcl_Obj *lObj;
errno = 0;
if(objc == 3
&& (fname = Tcl_GetStringFromObj(objv[1], NULL))
&& (cmd = (char *) Tcl_GetByteArrayFromObj(objv[2], &wlen))){
if((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1){
snprintf(errbuf = buf, sizeof(buf), "WPC: socket: %s", strerror(errno));
}
else{
name.sun_family = AF_UNIX;
strcpy(name.sun_path, fname);
if(connect(s, (struct sockaddr *) &name, sizeof(name)) == -1){
if(errno == ECONNREFUSED || errno == ENOENT)
snprintf(errbuf = buf, sizeof(buf), "WPC: Inactive session");
else
snprintf(errbuf = buf, sizeof(buf), "WPC: connect: %s", strerror(errno));
}
else if((n = wlen) != 0){
if(n < 0x7fffffff){
snprintf(lbuf, sizeof(lbuf), "%d\n", n);
i = strlen(lbuf);
if(write(s, lbuf, i) == i){
for(i = 0; n; n = n - i)
if((i = write(s, cmd + i, n)) == -1){
snprintf(errbuf = buf, sizeof(buf), "WPC: write: %s", strerror(errno));
break;
}
}
else
snprintf(errbuf = buf, sizeof(buf), "Can't write command length.");
}
else
snprintf(errbuf = buf, sizeof(buf), "Command too long.");
rbuf[0] = '\0';
rs = 0;
lObj = NULL;
while((n = read(s, buf, READBUF)) > 0)
if(!errbuf){
for(i = b = 0; i < n; i++)
if(buf[i] == '\n'){
if(rs){
Tcl_AppendToObj(Tcl_GetObjResult(interp), &buf[b], i - b);
Tcl_AppendToObj(Tcl_GetObjResult(interp), " ", 1);
}
else{
rs = 1;
if(append_rbuf(rbuf, &buf[b], i - b) < 0)
snprintf(errbuf = buf, sizeof(buf), "WPC: Response Code Overrun");
else if(!strcasecmp(rbuf,"OK"))
rv = TCL_OK;
else if(!strcasecmp(rbuf,"ERROR"))
rv = TCL_ERROR;
else if(!strcasecmp(rbuf,"BREAK"))
rv = TCL_BREAK;
else if(!strcasecmp(rbuf,"RETURN"))
rv = TCL_RETURN;
else
snprintf(errbuf = buf, sizeof(buf), "WPC: Unexpected response: %s", rbuf);
}
b = i + 1;
}
if(i - b > 0){
if(rs)
Tcl_AppendToObj(Tcl_GetObjResult(interp), &buf[b], i - b);
else if(append_rbuf(rbuf, &buf[b], i - b) < 0)
snprintf(errbuf = buf, sizeof(buf), "WPC: Response Code Overrun");
}
}
if(!errbuf){
if(n < 0){
snprintf(errbuf = buf, sizeof(buf), "WPC: read: %s", strerror(errno));
rv = TCL_ERROR;
}
else if(!rs){
if(n == 0)
snprintf(errbuf = buf, sizeof(buf), "WPC: Server connection closed (%d)", errno);
else
snprintf(errbuf = buf, sizeof(buf), "WPC: Invalid Response to \"%.*s\" (len %d) (%d): %.*s", 12, cmd, wlen, errno, RESULT_MAX, rbuf);
rv = TCL_ERROR;
}
else if(rv == TCL_ERROR){
char *s = Tcl_GetStringFromObj(Tcl_GetObjResult(interp), NULL);
if(!(s && *s))
snprintf(errbuf = buf, sizeof(buf), "WPC: Empty ERROR Response");
}
}
}
close(s);
}
}
else
snprintf(errbuf = buf, sizeof(buf), "Usage: %s path cmd", Tcl_GetStringFromObj(objv[0], NULL));
if(errbuf)
Tcl_SetResult(interp, errbuf, TCL_VOLATILE);
return(rv);
}
int
append_rbuf(char *rbuf, char *b, int l)
{
int i;
if(l + (i = strlen(rbuf)) > RESULT_MAX)
return(-1);
rbuf += i;
while(l--)
*rbuf++ = *b++;
*rbuf = '\0';
return(0);
}
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