implement SMTP mode -- doesn't support source routing or the

[unix-history] / usr / src / usr.sbin / sendmail / src / collect.c

# include <errno.h>
# include "sendmail.h"

static char     SccsId[] = "@(#)collect.c       3.24    %G%";

/*
**  COLLECT -- read & parse message header & make temp file.
**
**      Creates a temporary file name and copies the standard
**      input to that file.  While it is doing it, it looks for
**      "From:" and "Sender:" fields to use as the from-person
**      (but only if the -a flag is specified).  It prefers to
**      to use the "Sender:" field.
**
**      MIT seems to like to produce "Sent-By:" fields instead
**      of "Sender:" fields.  We used to catch this, but it turns
**      out that the "Sent-By:" field doesn't always correspond
**      to someone real ("___057", for instance), as required by
**      the protocol.  So we limp by.....
**
**      Parameters:
**              from -- the person we think it may be from.  If
**                      there is a "From" line, we will replace
**                      the name of the person by this.  If NULL,
**                      do no such replacement.
**
**      Returns:
**              Name of the "from" person extracted from the
**              arpanet header.
**
**      Side Effects:
**              Temp file is created and filled.
**              The from person may be set.
*/

long    MsgSize;                /* size of message in bytes */
FILE    *TempFile;              /* the tempfile (after creation) */

maketemp(from)
       char *from;
{
       register FILE *tf;
       char buf[MAXFIELD+1];
       register char *p;
       char *xfrom;
       extern char *hvalue();
       extern char *mktemp();
       extern char *index();

       /*
       **  Create the temp file name and create the file.
       */

       (void) mktemp(InFileName);
       (void) close(creat(InFileName, 0600));
       if ((tf = fopen(InFileName, "w")) == NULL)
       {
               syserr("Cannot create %s", InFileName);
               return;
       }

       /*
       **  Tell ARPANET to go ahead.
       */

       if (ArpaMode == ARPA_MAIL)
       {
               extern char Arpa_Enter[];

               message(Arpa_Enter, "Enter mail, end with \".\" on a line by itself");
       }

       /*
       **  Try to read a UNIX-style From line
       */

       if (fgets(buf, sizeof buf, stdin) == NULL)
               return;
# ifndef NOTUNIX
       if (!SaveFrom && strncmp(buf, "From ", 5) == 0)
       {
               eatfrom(buf);
               (void) fgets(buf, sizeof buf, stdin);
       }
# endif NOTUNIX

       /*
       **  Copy stdin to temp file & do message editting.
       **      To keep certain mailers from getting confused,
       **      and to keep the output clean, lines that look
       **      like UNIX "From" lines are deleted in the header,
       **      and prepended with ">" in the body.
       */

       for (; !feof(stdin); !feof(stdin) && fgets(buf, sizeof buf, stdin))
       {
               register char c;
               extern bool isheader();

               /* see if the header is over */
               if (!isheader(buf))
                       break;

               /* get the rest of this field */
               while ((c = getc(stdin)) == ' ' || c == '\t')
               {
                       p = &buf[strlen(buf)];
                       *p++ = c;
                       if (fgets(p, sizeof buf - (p - buf), stdin) == NULL)
                               break;
               }
               if (!feof(stdin))
                       (void) ungetc(c, stdin);

               MsgSize += strlen(buf);

               /*
               **  Snarf header away.
               */

               if (bitset(H_EOH, chompheader(buf, FALSE)))
                       break;
       }

# ifdef DEBUG
       if (Debug)
               printf("EOH\n");
# endif DEBUG

       /* throw away a blank line */
       if (buf[0] == '\n')
               (void) fgets(buf, sizeof buf, stdin);

       /*
       **  Collect the body of the message.
       */

       for (; !feof(stdin); !feof(stdin) && fgets(buf, sizeof buf, stdin) != NULL)
       {
               register int i;
               register char *bp = buf;

               /* check for end-of-message */
               if (!IgnrDot && buf[0] == '.' && (buf[1] == '\n' || buf[1] == '\0'))
                       break;

               /* check for transparent dot */
               if (Smtp && *bp == '.')
                       bp++;

# ifndef NOTUNIX
               /* Hide UNIX-like From lines */
               if (strncmp(bp, "From ", 5) == 0)
               {
                       fputs(">", tf);
                       MsgSize++;
               }
# endif NOTUNIX

               /*
               **  Figure message length, output the line to the temp
               **  file, and insert a newline if missing.
               */

               i = strlen(bp);
               MsgSize += i;
               fputs(bp, tf);
               if (bp[i - 1] != '\n')
                       fputs("\n", tf);
               if (ferror(tf))
               {
                       if (errno == ENOSPC)
                       {
                               (void) freopen(InFileName, "w", tf);
                               fputs("\nMAIL DELETED BECAUSE OF LACK OF DISK SPACE\n\n", tf);
                               syserr("collect: Out of disk space for temp file");
                       }
                       else
                               syserr("collect: Cannot write %s", InFileName);
                       (void) freopen("/dev/null", "w", tf);
               }
       }
       (void) fclose(tf);

       /*
       **  Find out some information from the headers.
       **      Examples are who is the from person & the date.
       */

       /* from person */
       xfrom = hvalue("sender");
       if (xfrom == NULL)
               xfrom = OrigFrom;
       if (ArpaMode != ARPA_NONE)
               setfrom(xfrom, (char *) NULL);

       /* full name of from person */
       p = hvalue("full-name");
       if (p != NULL)
               define('x', p);
       else
       {
               register char *q;

               /*
               **  Try to extract the full name from a general From:
               **  field.  We take anything which is a comment as a
               **  first choice.  Failing in that, we see if there is
               **  a "machine readable" name (in <angle brackets>); if
               **  so we take anything preceeding that clause.
               **
               **  If we blow it here it's not all that serious.
               */

               p = hvalue("original-from");
               if (p == NULL)
                       p = OrigFrom;
               q = index(p, '(');
               if (q != NULL)
               {
                       int parenlev = 0;

                       for (p = q; *p != '\0'; p++)
                       {
                               if (*p == '(')
                                       parenlev++;
                               else if (*p == ')' && --parenlev <= 0)
                                       break;
                       }
                       if (*p == ')')
                       {
                               *p = '\0';
                               if (*++q != '\0')
                                       define('x', newstr(q));
                               *p = ')';
                       }
               }
               else if ((q = index(p, '<')) != NULL)
               {
                       char savec;

                       while (*--q == ' ')
                               continue;
                       while (isspace(*p))
                               p++;
                       savec = *++q;
                       *q = '\0';
                       if (*p != '\0')
                               define('x', newstr(p));
                       *q = savec;
               }
       }

       /* date message originated */
       p = hvalue("posted-date");
       if (p == NULL)
               p = hvalue("date");
       if (p != NULL)
       {
               define('a', p);
               /* we don't have a good way to do canonical conversion ....
               define('d', newstr(arpatounix(p)));
               .... so we will ignore the problem for the time being */
       }

       if ((TempFile = fopen(InFileName, "r")) == NULL)
               syserr("Cannot reopen %s", InFileName);

# ifdef DEBUG
       if (Debug)
       {
               HDR *h;
               extern char *capitalize();

               printf("----- collected header -----\n");
               for (h = Header; h != NULL; h = h->h_link)
                       printf("%s: %s\n", capitalize(h->h_field), h->h_value);
               printf("----------------------------\n");
       }
# endif DEBUG
       return;
}
\f/*
**  EATFROM -- chew up a UNIX style from line and process
**
**      This does indeed make some assumptions about the format
**      of UNIX messages.
**
**      Parameters:
**              fm -- the from line.
**
**      Returns:
**              none.
**
**      Side Effects:
**              extracts what information it can from the header,
**              such as the date.
*/

# ifndef NOTUNIX

char    *DowList[] =
{
       "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", NULL
};

char    *MonthList[] =
{
       "Jan", "Feb", "Mar", "Apr", "May", "Jun",
       "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
       NULL
};

eatfrom(fm)
       char *fm;
{
       register char *p;
       register char **dt;

# ifdef DEBUG
       if (Debug > 1)
               printf("eatfrom(%s)\n", fm);
# endif DEBUG

       /* find the date part */
       p = fm;
       while (*p != '\0')
       {
               /* skip a word */
               while (*p != '\0' && *p != ' ')
                       *p++;
               while (*p == ' ')
                       *p++;
               if (!isupper(*p) || p[3] != ' ' || p[13] != ':' || p[16] != ':')
                       continue;

               /* we have a possible date */
               for (dt = DowList; *dt != NULL; dt++)
                       if (strncmp(*dt, p, 3) == 0)
                               break;
               if (*dt == NULL)
                       continue;

               for (dt = MonthList; *dt != NULL; dt++)
                       if (strncmp(*dt, &p[4], 3) == 0)
                               break;
               if (*dt != NULL)
                       break;
       }

       if (*p != NULL)
       {
               char *q;

               /* we have found a date */
               q = xalloc(25);
               strncpy(q, p, 25);
               q[24] = '\0';
               define('d', q);
       }
}

# endif NOTUNIX