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aux.c

/*    $OpenBSD: aux.c,v 1.22 2004/09/15 22:21:40 deraadt Exp $    */
/*    $NetBSD: aux.c,v 1.5 1997/05/13 06:15:52 mikel Exp $  */

/*
 * Copyright (c) 1980, 1993
 *    The Regents of the University of California.  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. Neither the name of 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 REGENTS 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 REGENTS 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
#if 0
static const char sccsid[] = "@(#)aux.c   8.1 (Berkeley) 6/6/93";
#else
static const char rcsid[] = "$OpenBSD: aux.c,v 1.22 2004/09/15 22:21:40 deraadt Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * Auxiliary functions.
 */
static char *save2str(char *, char *);

/*
 * Return a pointer to a dynamic copy of the argument.
 */
char *
savestr(char *str)
{
      char *new;
      int size = strlen(str) + 1;

      if ((new = salloc(size)) != NULL)
            (void)memcpy(new, str, size);
      return(new);
}

/*
 * Make a copy of new argument incorporating old one.
 */
static char *
save2str(char *str, char *old)
{
      char *new;
      int newsize = strlen(str) + 1;
      int oldsize = old ? strlen(old) + 1 : 0;

      if ((new = salloc(newsize + oldsize)) != NULL) {
            if (oldsize) {
                  (void)memcpy(new, old, oldsize);
                  new[oldsize - 1] = ' ';
            }
            (void)memcpy(new + oldsize, str, newsize);
      }
      return(new);
}

/*
 * Touch the named message by setting its MTOUCH flag.
 * Touched messages have the effect of not being sent
 * back to the system mailbox on exit.
 */
void
touch(struct message *mp)
{

      mp->m_flag |= MTOUCH;
      if ((mp->m_flag & MREAD) == 0)
            mp->m_flag |= MREAD|MSTATUS;
}

/*
 * Test to see if the passed file name is a directory.
 * Return true if it is.
 */
int
isdir(char *name)
{
      struct stat sbuf;

      if (stat(name, &sbuf) < 0)
            return(0);
      return(S_ISDIR(sbuf.st_mode));
}

/*
 * Count the number of arguments in the given string raw list.
 */
int
argcount(char **argv)
{
      char **ap;

      for (ap = argv; *ap++ != NULL;)
            ;     
      return(ap - argv - 1);
}

/*
 * Return the desired header line from the passed message
 * pointer (or NULL if the desired header field is not available).
 */
char *
hfield(char *field, struct message *mp)
{
      FILE *ibuf;
      char linebuf[LINESIZE];
      int lc;
      char *hfield;
      char *colon, *oldhfield = NULL;

      ibuf = setinput(mp);
      if ((lc = mp->m_lines - 1) < 0)
            return(NULL);
      if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
            return(NULL);
      while (lc > 0) {
            if ((lc = gethfield(ibuf, linebuf, lc, &colon)) < 0)
                  return(oldhfield);
            if ((hfield = ishfield(linebuf, colon, field)) != NULL)
                  oldhfield = save2str(hfield, oldhfield);
      }
      return(oldhfield);
}

/*
 * Return the next header field found in the given message.
 * Return >= 0 if something found, < 0 elsewise.
 * "colon" is set to point to the colon in the header.
 * Must deal with \ continuations & other such fraud.
 */
int
gethfield(FILE *f, char *linebuf, int rem, char **colon)
{
      char line2[LINESIZE];
      char *cp, *cp2;
      int c;

      for (;;) {
            if (--rem < 0)
                  return(-1);
            if ((c = readline(f, linebuf, LINESIZE, NULL)) <= 0)
                  return(-1);
            for (cp = linebuf; isprint(*cp) && *cp != ' ' && *cp != ':';
                 cp++)
                  ;
            if (*cp != ':' || cp == linebuf)
                  continue;
            /*
             * I guess we got a headline.
             * Handle wraparounding
             */
            *colon = cp;
            cp = linebuf + c;
            for (;;) {
                  while (--cp >= linebuf && (*cp == ' ' || *cp == '\t'))
                        ;
                  cp++;
                  if (rem <= 0)
                        break;
                  ungetc(c = getc(f), f);
                  if (c != ' ' && c != '\t')
                        break;
                  if ((c = readline(f, line2, LINESIZE, NULL)) < 0)
                        break;
                  rem--;
                  for (cp2 = line2; *cp2 == ' ' || *cp2 == '\t'; cp2++)
                        ;
                  c -= cp2 - line2;
                  if (cp + c >= linebuf + LINESIZE - 2)
                        break;
                  *cp++ = ' ';
                  (void)memcpy(cp, cp2, c);
                  cp += c;
            }
            *cp = 0;
            return(rem);
      }
      /* NOTREACHED */
}

/*
 * Check whether the passed line is a header line of
 * the desired breed.  Return the field body, or 0.
 */

char*
ishfield(char *linebuf, char *colon, char *field)
{
      char *cp = colon;

      *cp = 0;
      if (strcasecmp(linebuf, field) != 0) {
            *cp = ':';
            return(0);
      }
      *cp = ':';
      for (cp++; *cp == ' ' || *cp == '\t'; cp++)
            ;
      return(cp);
}

/*
 * Copy a string, lowercasing it as we go.  ``dsize'' should be
 * the real size (not len) of the dest string (guarantee NUL term).
 */
size_t
istrlcpy(char *dst, const char *src, size_t dsize)
{
      char *d = dst;
      const char *s = src;
      size_t n = dsize;

      /* Copy as many bytes as will fit */
      if (n != 0 && --n != 0) {
            do {
                  if (isupper(*s))
                        *d++ = tolower(*s++);
                  else if ((*d++ = *s++) == 0)
                        break;
            } while (--n != 0);
      }

      /* Not enough room in dst, add NUL and traverse rest of src */
      if (n == 0) {
            if (dsize != 0)
                  *d = '\0';        /* NUL-terminate dst */
            while (*s++)
                  ;
      }

      return(s - src - 1);    /* count does not include NUL */
}

/*
 * The following code deals with input stacking to do source
 * commands.  All but the current file pointer are saved on
 * the stack.
 */
static      int   ssp;              /* Top of file stack */
struct sstack {
      FILE  *s_file;          /* File we were in. */
      int   s_cond;                 /* Saved state of conditionals */
      int   s_loading;        /* Loading .mailrc, etc. */
} sstack[NOFILE];

/*
 * Pushdown current input file and switch to a new one.
 * Set the global flag "sourcing" so that others will realize
 * that they are no longer reading from a tty (in all probability).
 */
int
source(void *v)
{
      char **arglist = v;
      FILE *fi;
      char *cp;

      if ((cp = expand(*arglist)) == NULL)
            return(1);
      if ((fi = Fopen(cp, "r")) == NULL) {
            warn("%s", cp);
            return(1);
      }
      if (ssp >= NOFILE - 1) {
            puts("Too much \"sourcing\" going on.");
            (void)Fclose(fi);
            return(1);
      }
      sstack[ssp].s_file = input;
      sstack[ssp].s_cond = cond;
      sstack[ssp].s_loading = loading;
      ssp++;
      loading = 0;
      cond = CANY;
      input = fi;
      sourcing++;
      return(0);
}

/*
 * Pop the current input back to the previous level.
 * Update the "sourcing" flag as appropriate.
 */
int
unstack(void)
{

      if (ssp <= 0) {
            puts("\"Source\" stack over-pop.");
            sourcing = 0;
            return(1);
      }
      (void)Fclose(input);
      if (cond != CANY)
            puts("Unmatched \"if\"");
      ssp--;
      cond = sstack[ssp].s_cond;
      loading = sstack[ssp].s_loading;
      input = sstack[ssp].s_file;
      if (ssp == 0)
            sourcing = loading;
      return(0);
}

/*
 * Touch the indicated file.
 * This is nifty for the shell.
 */
void
alter(char *name)
{
      struct stat sb;
      struct timeval tv[2];

      if (stat(name, &sb))
            return;
      (void) gettimeofday(&tv[0], (struct timezone *)0);
      tv[0].tv_sec++;
#ifdef TIMESPEC_TO_TIMEVAL
      TIMESPEC_TO_TIMEVAL(&tv[1], &sb.st_mtimespec);
#else
      tv[1].tv_sec = sb.st_mtime;
      tv[1].tv_usec = 0;
#endif
      (void)utimes(name, tv);
}

/*
 * Examine the passed line buffer and
 * return true if it is all blanks and tabs.
 */
int
blankline(char *linebuf)
{
      char *cp;

      for (cp = linebuf; *cp; cp++)
            if (*cp != ' ' && *cp != '\t')
                  return(0);
      return(1);
}

/*
 * Get sender's name from this message.  If the message has
 * a bunch of arpanet stuff in it, we may have to skin the name
 * before returning it.
 */
char *
nameof(struct message *mp, int reptype)
{
      char *cp, *cp2;

      cp = skin(name1(mp, reptype), reptype);
      if (reptype != 0 || charcount(cp, '!') < 2)
            return(cp);
      cp2 = strrchr(cp, '!');
      cp2--;
      while (cp2 > cp && *cp2 != '!')
            cp2--;
      if (*cp2 == '!')
            return(cp2 + 1);
      return(cp);
}

/*
 * Start of a "comment".
 * Ignore it.
 */
char *
skip_comment(char *cp)
{
      int nesting = 1;

      for (; nesting > 0 && *cp; cp++) {
            switch (*cp) {
            case '\\':
                  if (cp[1])
                        cp++;
                  break;
            case '(':
                  nesting++;
                  break;
            case ')':
                  nesting--;
                  break;
            }
      }
      return(cp);
}

/*
 * Skin an arpa net address according to the RFC 822 interpretation
 * of "host-phrase."
 */
char *
skin(char *name, int reptype)
{
      char *nbuf, *bufend, *cp, *cp2;
      int c, gotlt, lastsp;

      if (name == NULL)
            return(NULL);
      if (strchr(name, '(') == NULL && strchr(name, '<') == NULL
          && strchr(name, ' ') == NULL)
            return(name);

      /* We assume that length(input) <= length(output) */
      if ((nbuf = (char *)malloc(strlen(name) + 1)) == NULL)
            errx(1, "Out of memory");
      gotlt = 0;
      lastsp = 0;
      bufend = nbuf;
      for (cp = name, cp2 = bufend; (c = *cp++) != '\0'; ) {
            switch (c) {
            case '(':
                  cp = skip_comment(cp);
                  lastsp = 0;
                  break;

            case '"':
                  /*
                   * Start of a "quoted-string".
                   * Copy it in its entirety.
                   */
                  while ((c = *cp) != '\0') {
                        cp++;
                        if (c == '"')
                              break;
                        if (c != '\\')
                              *cp2++ = c;
                        else if ((c = *cp) != '\0') {
                              *cp2++ = c;
                              cp++;
                        }
                  }
                  lastsp = 0;
                  break;

            case ' ':
                  if (cp[0] == 'a' && cp[1] == 't' && cp[2] == ' ')
                        cp += 3, *cp2++ = '@';
                  else
                  if (cp[0] == '@' && cp[1] == ' ')
                        cp += 2, *cp2++ = '@';
                  else
                        lastsp = 1;
                  break;

            case '<':
                  /* in case of showname it is time to return */
                  if (reptype == 0 && value("showname") != NULL) {
                        *cp2 = 0;
                        return(savestr(nbuf));
                  }
                  cp2 = bufend;
                  gotlt++;
                  lastsp = 0;
                  break;

            case '>':
                  if (gotlt) {
                        gotlt = 0;
                        while ((c = *cp) && c != ',') {
                              cp++;
                              if (c == '(')
                                    cp = skip_comment(cp);
                              else if (c == '"')
                                    while ((c = *cp) != '\0') {
                                          cp++;
                                          if (c == '"')
                                                break;
                                          if (c == '\\' && *cp)
                                                cp++;
                                    }
                        }
                        lastsp = 0;
                        break;
                  }
                  /* Fall into . . . */

            default:
                  if (lastsp) {
                        lastsp = 0;
                        *cp2++ = ' ';
                  }
                  *cp2++ = c;
                  if (c == ',' && *cp == ' ' && !gotlt) {
                        *cp2++ = ' ';
                        while (*++cp == ' ')
                              ;
                        lastsp = 0;
                        bufend = cp2;
                  }
            }
      }
      *cp2 = 0;

      if ((cp = (char *)realloc(nbuf, strlen(nbuf) + 1)) != NULL)
            nbuf = cp;
      return(nbuf);
}

/*
 * Fetch the sender's name from the passed message.
 * Reptype can be
 *    0 -- get sender's name for display purposes
 *    1 -- get sender's name for reply
 *    2 -- get sender's name for Reply
 */
char *
name1(struct message *mp, int reptype)
{
      char namebuf[LINESIZE];
      char linebuf[LINESIZE];
      char *cp, *cp2;
      FILE *ibuf;
      int first = 1;

      if ((cp = hfield("from", mp)) != NULL)
            return(cp);
      if (reptype == 0 && (cp = hfield("sender", mp)) != NULL)
            return(cp);
      ibuf = setinput(mp);
      namebuf[0] = '\0';
      if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
            return(savestr(namebuf));
newname:
      for (cp = linebuf; *cp && *cp != ' '; cp++)
            ;
      for (; *cp == ' ' || *cp == '\t'; cp++)
            ;
      for (cp2 = &namebuf[strlen(namebuf)];
           *cp && *cp != ' ' && *cp != '\t' && cp2 < namebuf + LINESIZE - 1;)
            *cp2++ = *cp++;
      *cp2 = '\0';
      if (readline(ibuf, linebuf, LINESIZE, NULL) < 0)
            return(savestr(namebuf));
      if ((cp = strchr(linebuf, 'F')) == NULL)
            return(savestr(namebuf));
      if (strncmp(cp, "From", 4) != 0)
            return(savestr(namebuf));
      while ((cp = strchr(cp, 'r')) != NULL) {
            if (strncmp(cp, "remote", 6) == 0) {
                  if ((cp = strchr(cp, 'f')) == NULL)
                        break;
                  if (strncmp(cp, "from", 4) != 0)
                        break;
                  if ((cp = strchr(cp, ' ')) == NULL)
                        break;
                  cp++;
                  if (first) {
                        cp2 = namebuf;
                        first = 0;
                  } else
                        cp2 = strrchr(namebuf, '!') + 1;
                  strlcpy(cp2, cp, sizeof(namebuf) - (cp2 - namebuf) - 1);
                  strlcat(namebuf, "!", sizeof(namebuf));
                  goto newname;
            }
            cp++;
      }
      return(savestr(namebuf));
}

/*
 * Count the occurances of c in str
 */
int
charcount(char *str, int c)
{
      char *cp;
      int i;

      for (i = 0, cp = str; *cp; cp++)
            if (*cp == c)
                  i++;
      return(i);
}

/*
 * Convert c to upper case
 */
int
chraise(int c)
{

      if (islower(c))
            return(toupper(c));
      return(c);
}

/*
 * Copy s1 to s2, return pointer to null in s2.
 */
char *
copy(char *s1, char *s2)
{

      while ((*s2++ = *s1++) != '\0')
            ;
      return(s2 - 1);
}

/*
 * See if the given header field is supposed to be ignored.
 */
int
isign(char *field, struct ignoretab ignore[2])
{
      char realfld[LINESIZE];

      if (ignore == ignoreall)
            return(1);
      /*
       * Lower-case the string, so that "Status" and "status"
       * will hash to the same place.
       */
      istrlcpy(realfld, field, sizeof(realfld));
      if (ignore[1].i_count > 0)
            return(!member(realfld, ignore + 1));
      else
            return(member(realfld, ignore));
}

int
member(char *realfield, struct ignoretab *table)
{
      struct ignore *igp;

      for (igp = table->i_head[hash(realfield)]; igp != 0; igp = igp->i_link)
            if (*igp->i_field == *realfield &&
                equal(igp->i_field, realfield))
                  return(1);
      return(0);
}

void
clearnew(void)
{
      struct message *mp;

      for (mp = &message[0]; mp < &message[msgCount]; mp++) {
            if (mp->m_flag & MNEW) {
                  mp->m_flag &= ~MNEW;
                  mp->m_flag |= MSTATUS;
            }
      }
}

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