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pcap.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   printcap parsing
   Copyright (C) Karl Auer 1993-1998

   Re-working by Martin Kiff, 1994
   
   Re-written again by Andrew Tridgell

   Modified for SVID support by Norm Jacobs, 1997

   Modified for CUPS support by Michael Sweet, 1999
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/*
 *  Parse printcap file.
 *
 *  This module does exactly one thing - it looks into the printcap file
 *  and tells callers if a specified string appears as a printer name.
 *
 *  The way this module looks at the printcap file is very simplistic.
 *  Only the local printcap file is inspected (no searching of NIS
 *  databases etc).
 *
 *  There are assumed to be one or more printer names per record, held
 *  as a set of sub-fields separated by vertical bar symbols ('|') in the
 *  first field of the record. The field separator is assumed to be a colon
 *  ':' and the record separator a newline.
 * 
 *  Lines ending with a backspace '\' are assumed to flag that the following
 *  line is a continuation line so that a set of lines can be read as one
 *  printcap entry.
 *
 *  A line stating with a hash '#' is assumed to be a comment and is ignored
 *  Comments are discarded before the record is strung together from the
 *  set of continuation lines.
 *
 *  Opening a pipe for "lpc status" and reading that would probably 
 *  be pretty effective. Code to do this already exists in the freely
 *  distributable PCNFS server code.
 *
 *  Modified to call SVID/XPG4 support if printcap name is set to "lpstat"
 *  in smb.conf under Solaris.
 *
 *  Modified to call CUPS support if printcap name is set to "cups"
 *  in smb.conf.
 */

#include "includes.h"

#include "smb.h"

#ifdef AIX
/*  ******************************************
     Extend for AIX system and qconfig file
       from 'boulard@univ-rennes1.fr
    ****************************************** */
static int strlocate(char *xpLine,char *xpS)
{
      int iS,iL,iRet;
      char *p;
      iS = strlen(xpS);
      iL = strlen(xpLine);

      iRet = 0;
      p = xpLine;
      while (iL >= iS)
      {
            if (strncmp(p,xpS,iS) == 0) {iRet =1;break;};
            p++;
            iL--;
      }
      /*DEBUG(3,(" strlocate %s in line '%s',ret=%d\n",xpS,xpLine,iRet));*/
      
      return(iRet);
}
      
      
/* ******************************************************************* */
/* *    Scan qconfig and search all virtual printer (device printer) * */
/* ******************************************************************* */
static void ScanQconfig_fn(char *psz,void (*fn)(char *, char *))
{
      int iEtat;
      FILE *pfile;
      char *line,*p;
      pstring name,comment;
      line  = NULL;
      *name = 0;
      *comment = 0;

      if ((pfile = sys_fopen(psz, "r")) == NULL)
      {
            DEBUG(0,( "Unable to open qconfig file %s for read!\n", psz));
            return;
      }

      iEtat = 0;
      /* scan qconfig file for searching <printername>:     */
      for (;(line = fgets_slash(NULL,sizeof(pstring),pfile)); safe_free(line))
      {
            if (*line == '*' || *line == 0)
            continue;
            switch (iEtat)
            {
                  case 0: /* locate an entry */
                   if (*line == '\t' || *line == ' ') continue;
                   if ((p=strchr(line,':')))
                   {
                        *p = '\0';
                        p = strtok(line,":");
                        if (strcmp(p,"bsh")!=0)
                          {
                            pstrcpy(name,p);
                            iEtat = 1;
                            continue;
                          }
                   }
                   break;
                  case 1: /* scanning device stanza */
                   if (*line == '*' || *line == 0) continue;
                   if (*line != '\t' && *line != ' ')
                   {
                     /* name is found without stanza device  */
                     /* probably a good printer ???         */
                     fn(name,comment);
                     iEtat = 0;
                     continue;
                    }
                  
                    if (strlocate(line,"backend"))
                    {
                        /* it's a device, not a virtual printer*/
                        iEtat = 0;
                    }
                    else if (strlocate(line,"device"))
                    {
                        /* it's a good virtual printer */
                        fn(name,comment);
                        iEtat = 0;
                        continue;
                    }
                    break;
            }
      }
      fclose(pfile);
}

/* Scan qconfig file and locate de printername */

static BOOL ScanQconfig(char *psz,char *pszPrintername)
{
      int iLg,iEtat;
      FILE *pfile;
      char *pName;
      char *line;

      pName = NULL;
      line  = NULL;
      if ((pszPrintername!= NULL) && ((iLg = strlen(pszPrintername)) > 0))
       pName = (char *) malloc(iLg+10);
      if (pName == NULL)
      {
            DEBUG(0,(" Unable to allocate memory for printer %s\n",pszPrintername));
            return(False);
      }
      if ((pfile = sys_fopen(psz, "r")) == NULL)
      {
            DEBUG(0,( "Unable to open qconfig file %s for read!\n", psz));
            SAFE_FREE(pName);
            return(False);
      }
      slprintf(pName, iLg + 9, "%s:",pszPrintername);
      iLg = strlen(pName);
      /*DEBUG(3,( " Looking for entry %s\n",pName));*/
      iEtat = 0;
      /* scan qconfig file for searching <printername>:     */
      for (;(line = fgets_slash(NULL,sizeof(pstring),pfile)); safe_free(line))
      {
            if (*line == '*' || *line == 0)
            continue;
            switch (iEtat)
            {
                  case 0: /* scanning entry */
                   if (strncmp(line,pName,iLg) == 0)
                   {
                        iEtat = 1;
                        continue;
                   }
                   break;
                  case 1: /* scanning device stanza */
                   if (*line == '*' || *line == 0) continue;
                   if (*line != '\t' && *line != ' ')
                   {
                     /* name is found without stanza device  */
                     /* probably a good printer ???         */
                     SAFE_FREE (line);
                     SAFE_FREE(pName);
                     fclose(pfile);
                     return(True);
                    }
                  
                    if (strlocate(line,"backend"))
                    {
                        /* it's a device, not a virtual printer*/
                        iEtat = 0;
                    }
                    else if (strlocate(line,"device"))
                    {
                        /* it's a good virtual printer */
                        SAFE_FREE (line);
                        SAFE_FREE(pName);
                        fclose(pfile);
                        return(True);
                    }
                    break;
            }
      }
      SAFE_FREE (pName);
      fclose(pfile);
      return(False);
}
#endif /* AIX */


/***************************************************************************
Scan printcap file pszPrintcapname for a printer called pszPrintername. 
Return True if found, else False. Returns False on error, too, after logging 
the error at level 0. For generality, the printcap name may be passed - if
passed as NULL, the configuration will be queried for the name. pszPrintername
must be in DOS codepage.
The xxx_printername_ok functions need fixing to understand they are being
given a DOS codepage. FIXME !! JRA.
***************************************************************************/

BOOL pcap_printername_ok(char *pszPrintername, const char *pszPrintcapname)
{
  char *line=NULL;
  const char *psz;
  char *p,*q;
  FILE *pfile;
  pstring cvt_buf;

  if (pszPrintername == NULL || pszPrintername[0] == '\0')
    {
      DEBUG(0,( "Attempt to locate null printername! Internal error?\n"));
      return(False);
    }

  /* only go looking if no printcap name supplied */
  if ((psz = pszPrintcapname) == NULL || psz[0] == '\0')
    if (((psz = lp_printcapname()) == NULL) || (psz[0] == '\0'))
      {
      DEBUG(0,( "No printcap file name configured!\n"));
      return(False);
      }

  pszPrintername = dos_to_unix(cvt_buf, pszPrintername);
#ifdef HAVE_CUPS
    if (strequal(psz, "cups"))
       return (cups_printername_ok(pszPrintername));
#endif /* HAVE_CUPS */

#ifdef SYSV
    if (strequal(psz, "lpstat"))
       return (sysv_printername_ok(pszPrintername));
#endif

#ifdef AIX
  if (strlocate(psz,"/qconfig"))
     return(ScanQconfig(psz,pszPrintername));
#endif

  if ((pfile = sys_fopen(psz, "r")) == NULL)
    {
      DEBUG(0,( "Unable to open printcap file %s for read!\n", psz));
      return(False);
    }

  for (;(line = fgets_slash(NULL,sizeof(pstring),pfile)); safe_free(line))
    {
      if (*line == '#' || *line == 0)
      continue;

      /* now we have a real printer line - cut it off at the first : */      
      p = strchr(line,':');
      if (p) *p = 0;
      
      /* now just check if the name is in the list */
      /* NOTE: I avoid strtok as the fn calling this one may be using it */
      for (p=line; p; p=q)
      {
        if ((q = strchr(p,'|'))) *q++ = 0;

        if (strequal(p,pszPrintername))
          {
            /* normalise the case */
            pstrcpy(pszPrintername,p);
            SAFE_FREE(line);
            fclose(pfile);
            return(True);           
          }
        p = q;
      }
    }

  fclose(pfile);
  return(False);
}


/***************************************************************************
run a function on each printer name in the printcap file. The function is 
passed the primary name and the comment (if possible). Note the fn() takes
strings in DOS codepage. This means the xxx_printer_fn() calls must be fixed
to return DOS codepage. FIXME !! JRA.
***************************************************************************/
void pcap_printer_fn(void (*fn)(char *, char *))
{
  pstring name,comment;
  char *line;
  char *psz;
  char *p,*q;
  FILE *pfile;

  /* only go looking if no printcap name supplied */
  if (((psz = lp_printcapname()) == NULL) || (psz[0] == '\0'))
    {
      DEBUG(0,( "No printcap file name configured!\n"));
      return;
    }

#ifdef HAVE_CUPS
    if (strequal(psz, "cups")) {
      cups_printer_fn(fn);
      return;
    }
#endif /* HAVE_CUPS */

#ifdef SYSV
    if (strequal(psz, "lpstat")) {
      sysv_printer_fn(fn);
      return;
    }
#endif

#ifdef AIX
  if (strlocate(psz,"/qconfig"))
  {
      ScanQconfig_fn(psz,fn);
     return;
  }
#endif

  if ((pfile = sys_fopen(psz, "r")) == NULL)
    {
      DEBUG(0,( "Unable to open printcap file %s for read!\n", psz));
      return;
    }

  for (;(line = fgets_slash(NULL,sizeof(pstring),pfile)); safe_free(line))
    {
      if (*line == '#' || *line == 0)
      continue;

      /* now we have a real printer line - cut it off at the first : */      
      p = strchr(line,':');
      if (p) *p = 0;
      
      /* now find the most likely printer name and comment 
       this is pure guesswork, but it's better than nothing */
      *name = 0;
      *comment = 0;
      for (p=line; p; p=q)
      {
        BOOL has_punctuation;
        if ((q = strchr(p,'|'))) *q++ = 0;

        has_punctuation = (strchr(p,' ') || strchr(p,'\t') || strchr(p,'(') || strchr(p,')'));

        if (strlen(p)>strlen(comment) && has_punctuation)
          {
            StrnCpy(comment,p,sizeof(comment)-1);
            continue;
          }

        if (strlen(p) <= MAXPRINTERLEN && strlen(p)>strlen(name) && !has_punctuation)
          {
            if (!*comment) pstrcpy(comment,name);
            pstrcpy(name,p);
            continue;
          }

        if (!strchr(comment,' ') && 
            strlen(p) > strlen(comment))
          {
            StrnCpy(comment,p,sizeof(comment)-1);
            continue;
          }
      }

      comment[60] = 0;
      name[MAXPRINTERLEN] = 0;

      if (*name) 
      fn(name,comment);
    }
  fclose(pfile);
}

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