/*
* Copyright (c) 1985 Corporation for Research and Educational Networking
* Copyright (c) 1988 University of Illinois Board of Trustees, Steven
*              Dorner, and Paul Pomes
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
*    must display the following acknowledgement:
*      This product includes software developed by the Corporation for
*      Research and Educational Networking (CREN), the University of
*      Illinois at Urbana, and their contributors.
* 4. Neither the name of CREN, the University nor the names of its
*    contributors may be used to endorse or promote products derived from
*    this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE TRUSTEES AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED.  IN NO EVENT SHALL THE TRUSTEES OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef lint
static char  RcsId[] = "@(#)$Id: ReadQi.c,v 1.5 1995/06/07 19:15:22 p-pomes Exp $";
#endif

/*
**  ReadQi -- Read and store response from Qi server
**
**      A Qi response has one of the following structures:
**
**      <-><code>:<subcode><ws><field name>:<string>
**      5XX:Error message
**      200:Ok.
**
**      The leading '-' marks a continuation line.  The last line of a
**      response will not have the '-'.
**
**      <code> is the response code.  Response codes are listed in qiapi.h
**      and closely follow the conventions of SMTP (RFC-821):
**
**      1XX - status
**      2XX - information
**      3XX - additional information or action needed
**      4XX - temporary errors
**      5XX - permanent errors
**      6XX - phquery specific codes
**
**      <subcode> links multiple fields (e.g., email and pager) to a single
**      individual.  If a name query results in a multiple match, subcode
**      increments by 1 for each person but has the same value for all response
**      lines for that individual.
**
**      <ws> is sufficient white space to right adjust <field name>: to the
**      same position on each line.
**
**      <field name> is one of the field type in phquery.h (e.g., department,
**      mailcode, etc).
**
**      <string> is either the value for <field name>, if <code> == 200 (LR_OK),
**      or an error message it <code> is anything else.
**
**      Parameters:
**              FromQi - stream descriptor for reading qi response
**              count - integer pointer for number of matches found.
**
**      Returns:
**              A pointer to a malloc()'ed block of QI_response structs that
**              is terminated with QI_response.code > 0.
**              Errors return a NULL pointer with the details reported via
**              syslog(3).
**
**      Side Effects:
**              Creates a block of data that must be later free()'d.
**              Advances FromQi.
*/

#include <syslog.h>
#ifdef __STDC__
# include <string.h>
#else /* !__STDC__ */
# include <strings.h>
#endif /* __STDC__ */
#include "qiapi.h"

#define         MAXSTR          4608
#define         CHNULL          ('\0')
#define         CPNULL          ((char *) NULL)

QIR *
ReadQi (FromQi, count)
   FILE *FromQi;
   int *count;
{
   int         i, code;
   int         loopcnt = 1;
   char        *tp;
   unsigned    qsize = sizeof (QIR);
   char        fstring[MAXSTR];        /* field string */
   char        message[MAXSTR];        /* field value */
   char        Temp[MAXSTR];
   int         CurField = -1;
   register QIR *Base, *RepChain;

   if (count != NULL)
       *count = 0;
   if ((Base = RepChain = (QIR *) malloc(qsize)) == NULL) {
       syslog(LOG_ERR, "ReadQi: malloc(%u): %m", qsize);
       return(QIR_NULL);
   }
   RepChain->field = -1;
   Base->message = CPNULL;
   do {
       *fstring = *message = CHNULL;
       if (fgets(Temp, MAXSTR-1, FromQi) == CPNULL) {
           syslog(LOG_ERR, "ReadQi: premature EOF");
           return(QIR_NULL);
       }
       if (QiDebug > 1)
           syslog(LOG_DEBUG, "ReadQi read =%s=", Temp);
       code = atoi(Temp);

       /* Loop immediately if we read a preliminary response (99<x<200) */
       if (code > 99 && code < 200)
           continue;

       /* Positive response codes are formatted "<code>:<message>" */
       if (code > 0 || abs(code) != 200) {
           RepChain->subcode = -1;
           if (sscanf(Temp, "%d:%[^\n]", &RepChain->code, message)
             != 2 || *message == CHNULL) {
               syslog(LOG_ERR, "ReadQi: short #1 sscanf: %m");
               return(QIR_NULL);
           }
       }

       /* Otherwise they are the 4 field type */
       else if ((i = sscanf(Temp, "%d:%d:%[^:]: %[^\n]",
         &RepChain->code, &RepChain->subcode, fstring, message))
         != 4 || *fstring == CHNULL || *message == CHNULL) {
           /*
            * The short sscanf() read may be due to a embedded
            * newline.  If so, continue for a bit to fill out the
            * code field before reading another line.
            */
           if (!(i == 3 && *message == CHNULL)) {
               syslog(LOG_ERR, "ReadQi: short #2 sscanf, expected 4 got %d",i);
               return(QIR_NULL);
           }
       }
       if (count != NULL && RepChain->subcode > 0)
           *count = RepChain->subcode;

       /*
        * Some fields go over multiple response lines.  In that case
        * the field is all blanks.  Copy the response field from the
        * previous response if not already set.
        */
       for (tp = fstring; tp <= fstring + (MAXSTR-1) && *tp == ' '; tp++)
           ;
       if (*tp)
           CurField = RepChain->field = FieldValue(tp);
       else
           RepChain->field = CurField;

       /* Now get a new line if message was empty. */
       if (*message == CHNULL)
           continue;
       RepChain->message = strdup(message);
       if (RepChain->code > 0)
           break;
       qsize += sizeof (QIR);
       if ((Base = (QIR *) realloc((char *) Base, qsize)) == NULL) {
           syslog(LOG_ERR, "ReadQi: realloc(%u): %m", qsize);
           return(QIR_NULL);
       }
       RepChain = Base + loopcnt;
       RepChain->field = -1;
       loopcnt++;
   } while (loopcnt);
   if (QiDebug)
       for (RepChain = Base; RepChain->code < 0; RepChain++)
           syslog(LOG_DEBUG, "code %d, subcode %d, field %d, message: %s",
             RepChain->code, RepChain->subcode,
             RepChain->field, RepChain->message);
   return(Base);
}

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