source: trunk/athena/bin/discuss/mclient/dsmail.c @ 23271

 /*
 *
 *      Copyright (C) 1988, 1989 by the Massachusetts Institute of Technology
 *      Developed by the MIT Student Information Processing Board (SIPB).
 *      For copying information, see the file mit-copyright.h in this release.
 *
 */
/*
 *
 * dsmail.c - Modifies/parses mail to discuss
 *
 *        $Id: dsmail.c,v 1.11 2006-03-10 07:11:39 ghudson Exp $
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sysexits.h>
#include <regex.h>
#include <sys/fcntl.h>


#include <discuss/discuss.h>
#include <rpc.h>
#include "config.h"

#define DEFAULT_SUBJECT "No subject found in mail header"
#define BUFFLEN 400
#define LISTLEN 40

/* Ultrix sux */
#ifndef EX_CONFIG
#define EX_CONFIG EX_SOFTWARE
#endif

#ifndef lint
static char rcsid[] =
    "$Id: dsmail.c,v 1.11 2006-03-10 07:11:39 ghudson Exp $";
#endif

extern char *optarg;                /* External variables for getopt */
extern int optind;

char *deflist[] = {
        "^to$","^from$","^cc$","^[^d].*-to$",".*-from$","^date$",
        "^message-id$", "^mime-version$", "^content-.*$", NULL
};
                
char *subjlist[] = {
        "^subject$",NULL
};

char *inreplyto[] = {
        "^in-reply-to$",NULL
};

char *fromlist[] = {
        "^from$",NULL
};     

char *progname;
char *save[LISTLEN],*reject[LISTLEN];
char *usr_mtg = "";
int dodefs, allfields, debug, have_host, subject_match=0;
char *optarg;
int optind;
extern tfile unix_tfile();
int reply_to;

void PRS();
void lower();
void trim();
void SendToMeeting();
int parse_reply_to();
int have_trn_num();
int subject_compare();

main(argc,argv)
        int argc;
        char *argv[];
{
     FILE *f;
     char line[BUFFLEN+1],*colonp,*ep;
     char *subject=NULL,*reply_to_str=NULL;
     int i,ok_prev=0,iscont = 0, have_signature = 0, len, d;
     char filename[60], signature[35], field_name[100];
     
#if defined(__APPLE__) && defined(__MACH__)
     add_error_table(&et_dsc_error_table);
#else
     initialize_dsc_error_table();
#endif

     PRS(argc,argv);                            /* Parse args */

     line[BUFFLEN]='\0';

     if (debug) 
          f=stdout;
     else {
          (void) mktemp(strcpy(filename, "/tmp/DSXXXXXX"));
          if ((d = open(filename, O_CREAT|O_EXCL|O_RDWR, 0600)) == -1)
            {
              fprintf (stderr, "250-Can't create temporary file ");
              fflush (stderr);
              perror(filename);
              return EX_TEMPFAIL;
            }
          if ((f = fdopen(d, "w+")) == NULL)
            {
              perror("250-Can't fdopen temporary file");
              return EX_TEMPFAIL;
            }
     }

     if (debug) printf("start of text->");
     
     if (fgets(line,BUFFLEN,stdin)==NULL)
          exit(EX_NOINPUT);

     while (*line != '\n') {                    /* Do headers */
          if (!iscont) {
               char *cp;

               ep = line + strlen(line);
               colonp = strchr(line, ':');
               if (colonp == NULL)
                    colonp = ep;
               len = colonp - line;
               if (len > sizeof(field_name))
                    len = sizeof(field_name)-1;
               strncpy(field_name, line, len);
               field_name[len] = '\0';
               lower(field_name);

               if (list_compare(field_name,subjlist)) { /* Subject */
                    cp = colonp;
                    if (*cp == ':')
                         cp++;
                    while (isspace(*cp))
                         cp++;

                    /* ignore second subject line */
                    if (subject==NULL) {
                         subject=malloc(ep-cp+1);
                         if (!subject)
                             exit (EX_TEMPFAIL);                                
                         (void) strcpy(subject,cp);

                         /* Trim subject */
                         trim(subject);
                    }   
               } else if (list_compare(field_name, inreplyto)) {
                    /* ignore second subject line */
                    cp = colonp;
                    if (*cp == ':')
                         cp++;

                    if (reply_to_str==NULL) {
                         reply_to_str=malloc(ep-cp+1);
                         if (!reply_to_str)
                             exit (EX_TEMPFAIL);                                
                         (void) strcpy(reply_to_str,cp);
                    }   
               }
               else if (list_compare(field_name,fromlist)) {
                    cp = colonp;
                    if (*cp == ':') {
                         cp++;
                         extract_full_name(cp, signature, sizeof(signature));
                         have_signature = TRUE;
                         if (debug)
                              printf ("got sig: %s\n",
                                      signature);
                    }
               }
          } else {
               if (list_compare(field_name, inreplyto) && reply_to_str != NULL) {
                    /* Concat reply-to */
                    reply_to_str = realloc(reply_to_str,strlen(reply_to_str) + strlen(line) + 1);
                    if (!reply_to_str)
                        exit (EX_TEMPFAIL);                             
                    strcpy(reply_to_str+strlen(reply_to_str),line);
               }
          }

          if ((ok_prev && iscont) || (!iscont && CheckField(field_name))) {
               ok_prev=1;
               fprintf(f,"%s",line);
          } else
               ok_prev=0;

          iscont = line[strlen(line)-1] != '\n';
          if (fgets(line,BUFFLEN,stdin)==NULL)
               goto bye;
          if (!iscont)
               iscont = (line[0] == ' ' || line[0] == '\t');
     }
     fprintf (f, "\n");

     /* Copy over body of message */
     while (fgets(line,BUFFLEN,stdin)!=NULL) {
          fprintf(f,"%s",line);
     }
     if (fflush(f) == EOF) {
          fprintf (stderr, "250-Can't write to ");
          fflush (stderr);
          perror (debug ? "standard output" : filename);
          exit (EX_TEMPFAIL);
     }
     
     SendToMeeting(f,(subject==NULL) ? DEFAULT_SUBJECT : subject,
                   reply_to_str,
                   (have_signature) ? signature : NULL);
 bye:
     if (!debug)
          (void) unlink(filename); 
     exit (EX_OK);
     
}

void SendToMeeting(f, subject, reply_to_str, signature)
char *subject;
char *reply_to_str;
char *signature;     
FILE *f;
{
     int len,have_mtg_info;
     static char module[100] = "discuss@";
     char *mtg_name,*cp,*short_name;
     int fatal_err, result, smtp_code, exit_code, reply_to_trn;
     tfile transaction;
     mtg_info minfo;
     trn_info tinfo;
     int trn_no, i;
     
     gethostname(&module[8], sizeof(module)-8);
     init_rpc();
     set_module(module, &fatal_err, &result);

     switch (result) {
     case 0:
          break;
     case RPC_NS_TIMEOUT:
          smtp_code = 250;
          exit_code = EX_TEMPFAIL;
          break;
     default:
          smtp_code = 554;
          exit_code = EX_CONFIG;
          break;
     }
     if (result) {
          fprintf(stderr, "%03d-Can't connect to discuss server: %s\n",
                  smtp_code, error_message(result));
          exit (exit_code);
     }
     
     rewind(f); lseek(fileno(f), 0, L_SET);
     transaction = unix_tfile(fileno(f));

     cp = strchr(subject, '\n');
     if (cp)
          *cp = '\0';

     /* Parse reply_to_string */
     have_mtg_info = FALSE;
     reply_to_trn = 0;
     if (reply_to_str != NULL && have_trn_num(reply_to_str)) {
          short_name = usr_mtg + strlen(usr_mtg);
          while (short_name > usr_mtg && *short_name != '/')
               short_name--;

          if (*short_name == '/')
               short_name++;

          reply_to_trn = parse_reply_to(reply_to_str, short_name);
          if (reply_to_trn == 0) {
               /* Get mtg info, to check out long name */
               get_mtg_info(usr_mtg, &minfo, &result);
               if (result == 0) {
                    have_mtg_info = TRUE;
                    reply_to_trn = parse_reply_to(reply_to_str, minfo.long_name);
               } else
                    reply_to_trn = parse_reply_to(reply_to_str, NULL);
          }
     }

     if (reply_to_trn == 0 && subject_match && strcmp(subject, DEFAULT_SUBJECT) && *subject != '\0') {
          if (!have_mtg_info) {
               /* Get mtg info, to check out long name */
               get_mtg_info(usr_mtg, &minfo, &result);
               if (result == 0)
                    have_mtg_info = TRUE;
          }
          if (have_mtg_info) {
               /* Walk through meeting, doing subject comparisons */
               for (i = 0; i < subject_match; i++) {
                    if (minfo.last-i < minfo.first)
                         break;

                    get_trn_info(usr_mtg, minfo.last-i, &tinfo, &result);
                    if (result == 0) {
                         if (subject_compare(tinfo.subject, subject)) {
                              reply_to_trn = minfo.last-i;
                              dsc_destroy_trn_info(&tinfo);
                              break;
                         }
                         dsc_destroy_trn_info(&tinfo);
                    }
               }
          }
     }

     if (debug) {
          printf("subject is ``%s''\nreply to %d in %s\n",
                 subject, reply_to_trn, usr_mtg);
     } 

     if (signature == NULL || *signature == '\0') {
          add_trn(usr_mtg, transaction, subject, reply_to_trn, &trn_no, &result);
     } else {
          if (get_server_version() < SERVER_2) {
               add_trn(usr_mtg, transaction, subject, reply_to_trn, &trn_no, &result);
          } else {
               add_trn2(usr_mtg, transaction, subject, signature, reply_to_trn, &trn_no, &result);
          }
     }

     /* If error, try it as a non-reply */
     if ((result == NO_SUCH_TRN || result == DELETED_TRN || result == NO_ACCESS)  && reply_to_trn != 0) {
          tdestroy(transaction);
          rewind(f); lseek(fileno(f), 0, L_SET);
          transaction = unix_tfile(fileno(f));
          if (signature == NULL || *signature == '\0' || get_server_version() < SERVER_2) {
               add_trn(usr_mtg, transaction, subject, 0, &trn_no, &result);
          } else {
               add_trn2(usr_mtg, transaction, subject, signature, 0, &trn_no, &result);
          }
     }
     
     switch (result) {
     case 0:
          break;
     default:
          smtp_code = 550;
          exit_code = EX_CANTCREAT;
     }
     if (result) {
          fprintf (stderr, "%03d-Can't enter transaction", smtp_code);
          if (reply_to)
               fprintf (stderr, " as reply to %d", reply_to);
          fprintf (stderr, "\n%03d- into meeting %s: %s\n",
                   smtp_code, usr_mtg, error_message (result));
          exit(exit_code);
     }
     (void) fclose(f);
}

void
lower(s)
char *s;
{
     while (*s) {
          if (isupper(*s))
               *s = tolower(*s);
          s++;
     }
}

void
trim(s)
char *s;
{
     char *cp;

     cp = &s[strlen(s)]-1;
     while (cp >= s && isspace(*cp)) {
          *cp-- = '\0';
     }
}

int CheckField(key)
        char *key;
{
        int keepfield;

        keepfield=allfields;
        if (!keepfield && dodefs && list_compare(key,deflist))
                keepfield=1;
        if (!keepfield && list_compare(key,save))
                keepfield=1;
        if (keepfield && list_compare(key,reject))
                keepfield=0;
        return(keepfield);
}

/* Parse command line arguments */
void PRS(argc,argv)
        int argc;
        char **argv;
{
        int c,rp,sp;
        
        progname=argv[0];
        sp=rp=0;
        optind=1;               /* Initialize for getopt */
        while ((c = getopt(argc,argv,"AZDs:da:r:h")) != EOF)
                switch(c) {
                case 'd':
                        dodefs=!dodefs;
                        break;

                case 's':
                        subject_match = atoi(optarg);
                        break;

                case 'D':
                        debug=!debug;
                        break;

                case 'A':
                        allfields=!allfields;
                        break;

                case 'a':
                        lower(optarg);
                        save[sp++]=optarg;
                        if (sp>=LISTLEN) {
                                fprintf(stderr,"500-Too many accept fields\n");
                                exit (EX_USAGE);
                        }
                        break;

                case 'h':
                        have_host = 1;
                        break;

                case 'r':
                        lower(optarg);
                        reject[rp++]=optarg;
                        if (sp>=LISTLEN) {
                                fprintf(stderr,"500-Too many reject fields\n");
                                exit (EX_USAGE);
                        }
                }    
        if (optind>=argc) 
                goto lusage;
        usr_mtg=argv[optind];
        if (have_host) {
                usr_mtg = strchr (usr_mtg, ':');
                if (!usr_mtg)
                        goto lusage;
                usr_mtg++;
        }
        save[sp]=NULL;          /* Insert terminators */
        reject[rp]=NULL;
        return;
 lusage:
        printf("500-Usage: %s [-dADZ] [-s subject-match-count] [-a field] [-r field] meeting-path-name\n",
               progname);
        exit (EX_USAGE);
}

int list_compare(s,list)
        char *s,**list;
{
        char buf[BUFSIZ];
        regex_t reg;
        int status;

        while (*list!=NULL) {
                status = regcomp(&reg, *list, REG_NOSUB);
                if (status != 0) {
                        regerror(status, &reg, buf, sizeof(buf));
                        fprintf(stderr,"554-%s - %s: %s\n",
                                progname, *list, buf);
                }
                if (regexec(&reg, s, 0, NULL, 0) == 0) {
                        regfree(&reg);
                        return 1;
                }
                regfree(&reg);
                list++;
        }
        return(0);
}

strip_addr(addr, dest, dest_size)
char *addr,*dest;
int dest_size;
{
     char *dest_end,*dp,*sp,*quote_start;
     int paren_level,found_angle;

     dest_end = &dest[dest_size-1];
     dp = dest;
     sp = addr;
     paren_level = 0;

eat_white:
     while (isspace(*sp) && *sp != '\n')
          sp++;

     if (*sp == '(')
          goto eat_comment;

     if (*sp == '"')
          goto eat_string;

     if (*sp == '<') {
          dp = dest;
          sp++;
          found_angle = TRUE;
          goto eat_white;
     }

     if (*sp == '>' && found_angle) {
          *sp++;
          goto eat_white;
     }

     if (*sp == '\0' || *sp == '\n') {
          *dp++ = '\0';
          goto post_proc;
     }

     *dp++ = *sp++;
     if (dp == dest_end) {
          *dp++ = '\0';
          goto post_proc;
     }

     goto eat_white;

eat_comment:
     paren_level++;
     sp++;

cont_comment:
     while (*sp != ')' && *sp != '(' && *sp) {
          sp++;
     }

     if (*sp == '\0') {
          *dp = '\0';
          goto post_proc;
     }

     if (*sp == '(')
          goto eat_comment;

     sp++;              /* ) */
     paren_level--;
     if (paren_level <= 0)
          goto eat_white;

     goto cont_comment;

eat_string:
     quote_start = sp;
     sp++;

     while(*sp != '"' && *sp) 
          sp++;

     if (!*sp) {
          *dp = '\0';
          goto post_proc;
     }

     if (*++sp == '@') {                /* "foo"@bar */
          sp = quote_start;
          *dp++ = *sp++;
          while (dp < dest_end && *sp != '"')
               *dp++ = *sp++;

          if (dp == dest_end) {
               *dp = '\0';
               goto post_proc;
          }
          *dp++ = *sp++;
          if (dp == dest_end) {
               *dp++ = '\0';
               goto post_proc;
          }
     }
     goto eat_white;

     /* No post processing */
post_proc:
     return;
}

/*
 *
 *   Routine to extract a full name from an address.  If no full name
 *   can be found, then we simply return the stripped address.
 *
 */
extract_full_name(addr, dest, dest_size)
char *addr,*dest;
int dest_size;
{
     char *dest_end,*dp,*sp,*bracket,*close_paren;
     int paren_level,non_white;

     dest_end = &dest[dest_size-1];
     dp = dest;
     sp = addr;

     /* Find angle bracket (if possible) */
     while (*sp && *sp != '<' && *sp != '\n')
          sp++;

     bracket = NULL;
     if (*sp == '<')
          bracket = sp;

     non_white = 0;
     if (bracket != NULL) {
          for (sp = addr; sp < bracket; sp++) {
               if (!isspace(*sp) && *sp != '"')
                    non_white++;
          }
     }

     if (non_white > 1) {               /* We have a name */
          sp = addr;
          while (isspace(*sp) || *sp == '"')    /* Skip leading spaces */
               sp++;

          while (isspace(*(bracket-1)) || *(bracket-1) == '"')  /* Skip trailing spaces */
               bracket--;

          /* Copy it over */
          while (sp < bracket && dp < dest_end)
               *dp++ = *sp++;

          *dp++ = '\0';
          return;
     }

     /* Now, let's see if we have name in a comment (look back from the
        end for a parenthesis. */
     for (sp = addr; *sp && *sp != '\n'; sp++)
          ;

     sp--;
     while (sp > addr && isspace(*sp))
          sp--;

     if (*sp == ')') {                  /* Name in comment */
          close_paren = sp;
          paren_level = 1;
          sp--;

          for (;sp > addr; sp--) {
               if (*sp == ')')
                    paren_level++;
               else if (*sp == '(') {
                    paren_level--;
                    if (paren_level == 0)
                         break;
               }
          }

          if (*sp == '(') {             /* Copy it over */
               sp++;

               while(isspace(*sp))
                    sp++;

               while (sp < close_paren && dp < dest_end)
                    *dp++ = *sp++;

               *dp = '\0';
               return;
          }
     }

     strip_addr(addr, dest, dest_size);
     return;
}         

/*
 *
 *   parse_reply_to() - Parse an in-reply-to message for a given message.
 *
 */
int
parse_reply_to(str, mtg_name)
char *str;
char *mtg_name;
{
     char *bracketp,*end_bracketp,*startp,*cp;
     int trn_num,mtg_name_len;

     startp = str;
     while (1) {
          bracketp = strchr(startp, '[');
          if (bracketp == NULL)
               return(0);

          end_bracketp = strchr(bracketp, ']');
          if (end_bracketp == NULL || end_bracketp - bracketp > 10)
               return(0);

          trn_num = 0;
          cp = bracketp+1;
          while (isdigit(*cp)) {
               trn_num = trn_num*10 + *cp++ - '0';
          }
          
          if (*cp == '\\')                              /* Skip quoting char */
               cp++;
          
          if (*cp != ']')
               trn_num = 0;
          
          if (trn_num == 0)
               return(0);
          
          cp++;
          while (isspace(*cp) || *cp == '"')
               cp++;
          
          if (mtg_name == NULL)                         /* Match anything */
               return(trn_num);

          /* Look for "in" */
          if (*cp != 'i' && *cp != 'I')
               return(trn_num);
          
          cp++;
          if (*cp != 'n' && *cp != 'N')
               return(trn_num);

          cp++;
          while (isspace(*cp) || *cp == '"')
               cp++;

          /* Check for meeting name.  If it doesn't match, we don't have
             a transaction number */
          mtg_name_len = strlen(mtg_name);
          if (mtg_name == NULL || strlen(cp) < mtg_name_len) {
               startp = cp;
               continue;
          }

          /* Check if match, and ends fine (random punctuation or space) */
          if (!strncasecmp(cp, mtg_name, mtg_name_len) &&
              !isalnum(*(cp+mtg_name_len)) && *(cp+mtg_name_len) != '_' &&
              *(cp+mtg_name_len) != '-')
               return(trn_num);

          startp = cp;
     }
}

int
have_trn_num(str)
char *str;
{
     char *bracketp,*end_bracketp,*cp;
     int trn_num;

     bracketp = strchr(str, '[');
     if (bracketp == NULL)
          return(FALSE);

     end_bracketp = strchr(bracketp, ']');
     if (end_bracketp == NULL || end_bracketp - bracketp > 10)
          return;

     trn_num = 0;
     cp = bracketp+1;
     while (isdigit(*cp)) {
          trn_num = trn_num*10 + *cp++ - '0';
     }

     if (*cp == '\\')                           /* Skip quoting char */
          cp++;

     if (*cp != ']')
          trn_num = 0;

     if (trn_num == 0)
          return(FALSE);

     return(TRUE);
}

/*
 *
 *   Compare subjects, ignoring 're: *' at the beginning and trailing
 *      white space
 *
 */
int
subject_compare(subj1, subj2)
char *subj1, *subj2;
{
     char *cp;
     int min_len, len1, len2;

     while (*subj1) {
          while (isspace(*subj1))
               subj1++;

          cp = subj1;

          if (*cp != 'r' && *cp != 'R')
               break;

          cp++;
          if (*cp != 'e' && *cp != 'E')
               break;
          cp++;

          if (*cp != ':')
               break;

          subj1 = cp+1;
     }

     while (*subj2) {
          while (isspace(*subj2))
               subj2++;

          cp = subj2;

          if (*cp != 'r' && *cp != 'R')
               break;

          cp++;
          if (*cp != 'e' && *cp != 'E')
               break;
          cp++;

          if (*cp != ':')
               break;

          subj2 = cp+1;
     }

     /* Compare subjects, ignoring trailing white-space */
     len1 = strlen(subj1);
     len2 = strlen(subj2);
     if (len1 < len2)
          min_len = len1;
     else
          min_len = len2;

     if (min_len <= 0)
          return(0);

     if (strncasecmp(subj1, subj2, min_len))
          return(0);

     if (len1 == len2)
          return(1);

     if (len1 < len2)
          cp = &subj2[len1];
     else
          cp = &subj1[len2];

     /* If rest if white-space, we match */
     while (*cp) {
          if (*cp != ' ')
               return(0);
          cp++;
     }
     return(1);
}