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fio.c

/*    $OpenBSD: fio.c,v 1.30 2007/10/05 14:39:39 chl Exp $  */
/*    $NetBSD: fio.c,v 1.8 1997/07/07 22:57:55 phil 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[] = "@(#)fio.c   8.2 (Berkeley) 4/20/95";
#else
static const char rcsid[] = "$OpenBSD: fio.c,v 1.30 2007/10/05 14:39:39 chl Exp $";
#endif
#endif /* not lint */

#include "rcv.h"
#include <sys/file.h>
#include <sys/wait.h>

#include <unistd.h>
#include <paths.h>
#include <errno.h>
#include "extern.h"

/*
 * Mail -- a mail program
 *
 * File I/O.
 */

static volatile sig_atomic_t fiosignal;

/*
 * Wrapper for read() to catch EINTR.
 */
static ssize_t
myread(int fd, char *buf, int len)
{
      ssize_t nread;

      while ((nread = read(fd, buf, len)) == -1 && errno == EINTR)
            ;
      return(nread);
}

/*
 * Set up the input pointers while copying the mail file into /tmp.
 */
void
setptr(FILE *ibuf, off_t offset)
{
      int c, count;
      char *cp, *cp2;
      struct message this;
      FILE *mestmp;
      int maybe, inhead, omsgCount;
      char linebuf[LINESIZE], pathbuf[PATHSIZE];

      /* Get temporary file. */
      (void)snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir);
      if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL)
            err(1, "can't open %s", pathbuf);
      (void)rm(pathbuf);

      if (offset == 0) {
            msgCount = 0;
      } else {
            /* Seek into the file to get to the new messages */
            (void)fseeko(ibuf, offset, SEEK_SET);
            /*
             * We need to make "offset" a pointer to the end of
             * the temp file that has the copy of the mail file.
             * If any messages have been edited, this will be
             * different from the offset into the mail file.
             */
            (void)fseeko(otf, (off_t)0, SEEK_END);
            offset = ftell(otf);
      }
      omsgCount = msgCount;
      maybe = 1;
      inhead = 0;
      this.m_flag = MUSED|MNEW;
      this.m_size = 0;
      this.m_lines = 0;
      this.m_block = 0;
      this.m_offset = 0;
      for (;;) {
            if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) {
                  if (append(&this, mestmp))
                        err(1, "temporary file");
                  makemessage(mestmp, omsgCount);
                  return;
            }
            count = strlen(linebuf);
            /*
             * Transforms lines ending in <CR><LF> to just <LF>.
             * This allows mail to be able to read Eudora mailboxes
             * that reside on a DOS partition.
             */
            if (count >= 2 && linebuf[count-1] == '\n' &&
                linebuf[count - 2] == '\r') {
                  linebuf[count - 2] = '\n';
                  linebuf[count - 1] = '\0';
                  count--;
            }

            (void)fwrite(linebuf, sizeof(*linebuf), count, otf);
            if (ferror(otf))
                  err(1, "/tmp");
            if (count && linebuf[count - 1] == '\n')
                  linebuf[count - 1] = '\0';
            if (maybe && linebuf[0] == 'F' && ishead(linebuf)) {
                  msgCount++;
                  if (append(&this, mestmp))
                        err(1, "temporary file");
                  this.m_flag = MUSED|MNEW;
                  this.m_size = 0;
                  this.m_lines = 0;
                  this.m_block = blockof(offset);
                  this.m_offset = offsetof(offset);
                  inhead = 1;
            } else if (linebuf[0] == 0) {
                  inhead = 0;
            } else if (inhead) {
                  for (cp = linebuf, cp2 = "status";; cp++) {
                        if ((c = *cp2++) == 0) {
                              while (isspace(*cp++))
                                    ;
                              if (cp[-1] != ':')
                                    break;
                              while ((c = *cp++) != '\0')
                                    if (c == 'R')
                                          this.m_flag |= MREAD;
                                    else if (c == 'O')
                                          this.m_flag &= ~MNEW;
                              inhead = 0;
                              break;
                        }
                        if (*cp != c && *cp != toupper(c))
                              break;
                  }
            }
            offset += count;
            this.m_size += count;
            this.m_lines++;
            maybe = linebuf[0] == 0;
      }
}

/*
 * Drop the passed line onto the passed output buffer.
 * If a write error occurs, return -1, else the count of
 * characters written, including the newline if requested.
 */
int
putline(FILE *obuf, char *linebuf, int outlf)
{
      int c;

      c = strlen(linebuf);
      (void)fwrite(linebuf, sizeof(*linebuf), c, obuf);
      if (outlf) {
            (void)putc('\n', obuf);
            c++;
      }
      if (ferror(obuf))
            return(-1);
      return(c);
}

/*
 * Read up a line from the specified input into the line
 * buffer.  Return the number of characters read.  Do not
 * include the newline (or carriage return) at the end.
 */
int
readline(FILE *ibuf, char *linebuf, int linesize, int *signo)
{
      struct sigaction act;
      struct sigaction savetstp;
      struct sigaction savettou;
      struct sigaction savettin;
      struct sigaction saveint;
      struct sigaction savehup;
      sigset_t oset;
      int n;

      /*
       * Setup signal handlers if the caller asked us to catch signals.
       * Note that we do not restart system calls since we need the
       * read to be interruptible.
       */
      if (signo) {
            fiosignal = 0;
            sigemptyset(&act.sa_mask);
            act.sa_flags = 0;
            act.sa_handler = fioint;
            if (sigaction(SIGINT, NULL, &saveint) == 0 &&
                saveint.sa_handler != SIG_IGN) {
                  (void)sigaction(SIGINT, &act, &saveint);
                  (void)sigprocmask(SIG_UNBLOCK, &intset, &oset);
            }
            if (sigaction(SIGHUP, NULL, &savehup) == 0 &&
                savehup.sa_handler != SIG_IGN)
                  (void)sigaction(SIGHUP, &act, &savehup);
            (void)sigaction(SIGTSTP, &act, &savetstp);
            (void)sigaction(SIGTTOU, &act, &savettou);
            (void)sigaction(SIGTTIN, &act, &savettin);
      }

      clearerr(ibuf);
      if (fgets(linebuf, linesize, ibuf) == NULL) {
            if (ferror(ibuf))
                  clearerr(ibuf);
            n = -1;
      } else {
            n = strlen(linebuf);
            if (n > 0 && linebuf[n - 1] == '\n')
                  linebuf[--n] = '\0';
            if (n > 0 && linebuf[n - 1] == '\r')
                  linebuf[--n] = '\0';
      }

      if (signo) {
            (void)sigprocmask(SIG_SETMASK, &oset, NULL);
            (void)sigaction(SIGINT, &saveint, NULL);
            (void)sigaction(SIGHUP, &savehup, NULL);
            (void)sigaction(SIGTSTP, &savetstp, NULL);
            (void)sigaction(SIGTTOU, &savettou, NULL);
            (void)sigaction(SIGTTIN, &savettin, NULL);
            *signo = fiosignal;
      }

      return(n);
}

/*
 * Return a file buffer all ready to read up the
 * passed message pointer.
 */
FILE *
setinput(struct message *mp)
{

      fflush(otf);
      if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), SEEK_SET)
          < 0)
            err(1, "fseek");
      return(itf);
}

/*
 * Take the data out of the passed ghost file and toss it into
 * a dynamically allocated message structure.
 */
void
makemessage(FILE *f, int omsgCount)
{
      size_t size;
      struct message *nmessage;

      size = (msgCount + 1) * sizeof(struct message);
      nmessage = (struct message *)realloc(message, size);
      if (nmessage == 0)
            errx(1, "Insufficient memory for %d messages",
                msgCount);
      if (omsgCount == 0 || message == NULL)
            dot = nmessage;
      else
            dot = nmessage + (dot - message);
      message = nmessage;
      size -= (omsgCount + 1) * sizeof(struct message);
      fflush(f);
      (void)lseek(fileno(f), (off_t)sizeof(*message), SEEK_SET);
      if (myread(fileno(f), (void *) &message[omsgCount], size) != size)
            errx(1, "Message temporary file corrupted");
      message[msgCount].m_size = 0;
      message[msgCount].m_lines = 0;
      (void)Fclose(f);
}

/*
 * Append the passed message descriptor onto the temp file.
 * If the write fails, return 1, else 0
 */
int
append(struct message *mp, FILE *f)
{

      return(fwrite((char *) mp, sizeof(*mp), 1, f) != 1);
}

/*
 * Delete or truncate a file, but only if the file is a plain file.
 */
int
rm(char *name)
{
      struct stat sb;

      if (stat(name, &sb) < 0)
            return(-1);
      if (!S_ISREG(sb.st_mode)) {
            errno = EISDIR;
            return(-1);
      }
      if (unlink(name) == -1) {
            if (errno == EPERM)
                  return(truncate(name, (off_t)0));
            else
                  return(-1);
      }
      return(0);
}

static int sigdepth;          /* depth of holdsigs() */
static sigset_t nset, oset;
/*
 * Hold signals SIGHUP, SIGINT, and SIGQUIT.
 */
void
holdsigs(void)
{

      if (sigdepth++ == 0) {
            sigemptyset(&nset);
            sigaddset(&nset, SIGHUP);
            sigaddset(&nset, SIGINT);
            sigaddset(&nset, SIGQUIT);
            sigprocmask(SIG_BLOCK, &nset, &oset);
      }
}

/*
 * Release signals SIGHUP, SIGINT, and SIGQUIT.
 */
void
relsesigs(void)
{

      if (--sigdepth == 0)
            sigprocmask(SIG_SETMASK, &oset, NULL);
}

/*
 * Unblock and ignore a signal
 */
int
ignoresig(int sig, struct sigaction *oact, sigset_t *oset)
{
      struct sigaction act;
      sigset_t nset;
      int error;

      sigemptyset(&act.sa_mask);
      act.sa_flags = SA_RESTART;
      act.sa_handler = SIG_IGN;
      error = sigaction(sig, &act, oact);

      if (error == 0) {
            sigemptyset(&nset);
            sigaddset(&nset, sig);
            (void)sigprocmask(SIG_UNBLOCK, &nset, oset);
      } else if (oset != NULL)
            (void)sigprocmask(SIG_BLOCK, NULL, oset);

      return(error);
}

/*
 * Determine the size of the file possessed by
 * the passed buffer.
 */
off_t
fsize(FILE *iob)
{
      struct stat sbuf;

      if (fstat(fileno(iob), &sbuf) < 0)
            return(0);
      return(sbuf.st_size);
}

/*
 * Evaluate the string given as a new mailbox name.
 * Supported meta characters:
 *    %     for my system mail box
 *    %user for user's system mail box
 *    #     for previous file
 *    &     invoker's mbox file
 *    +file file in folder directory
 *    any shell meta character
 * Return the file name as a dynamic string.
 */
char *
expand(char *name)
{
      char xname[PATHSIZE];
      char cmdbuf[PATHSIZE];        /* also used for file names */
      pid_t pid;
      int l;
      char *cp, *shell;
      int pivec[2];
      struct stat sbuf;
      extern int wait_status;

      /*
       * The order of evaluation is "%" and "#" expand into constants.
       * "&" can expand into "+".  "+" can expand into shell meta characters.
       * Shell meta characters expand into constants.
       * This way, we make no recursive expansion.
       */
      switch (*name) {
      case '%':
            findmail(name[1] ? name + 1 : myname, xname, sizeof(xname));
            return(savestr(xname));
      case '#':
            if (name[1] != 0)
                  break;
            if (prevfile[0] == 0) {
                  puts("No previous file");
                  return(NULL);
            }
            return(savestr(prevfile));
      case '&':
            if (name[1] == 0 && (name = value("MBOX")) == NULL)
                  name = "~/mbox";
            /* fall through */
      }
      if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) {
            (void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1);
            name = savestr(xname);
      }
      /* catch the most common shell meta character */
      if (name[0] == '~' && homedir && (name[1] == '/' || name[1] == '\0')) {
            (void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1);
            name = savestr(xname);
      }
      if (strpbrk(name, "~{[*?$`'\"\\") == NULL)
            return(name);
      /* XXX - just use glob(3) and env expansion instead? */
      if (pipe(pivec) < 0) {
            warn("pipe");
            return(name);
      }
      (void)snprintf(cmdbuf, sizeof(cmdbuf), "echo %s", name);
      shell = value("SHELL");
      pid = start_command(shell, 0, -1, pivec[1], "-c", cmdbuf, NULL);
      if (pid < 0) {
            (void)close(pivec[0]);
            (void)close(pivec[1]);
            return(NULL);
      }
      (void)close(pivec[1]);
      l = myread(pivec[0], xname, PATHSIZE);
      if (l < 0)
            warn("read"); /* report error before errno changes */
      (void)close(pivec[0]);
      if (wait_child(pid) < 0 && WIFSIGNALED(wait_status) &&
          WTERMSIG(wait_status) != SIGPIPE) {
            fprintf(stderr, "\"%s\": Expansion failed.\n", name);
            return(NULL);
      }
      if (l < 0)
            return(NULL);
      if (l == 0) {
            fprintf(stderr, "\"%s\": No match.\n", name);
            return(NULL);
      }
      if (l == PATHSIZE) {
            fprintf(stderr, "\"%s\": Expansion buffer overflow.\n", name);
            return(NULL);
      }
      xname[l] = '\0';
      for (cp = &xname[l-1]; *cp == '\n' && cp > xname; cp--)
            ;
      cp[1] = '\0';
      if (strchr(xname, ' ') && stat(xname, &sbuf) < 0) {
            fprintf(stderr, "\"%s\": Ambiguous.\n", name);
            return(NULL);
      }
      return(savestr(xname));
}

/*
 * Determine the current folder directory name.
 */
int
getfold(char *name, int namelen)
{
      char *folder;

      if ((folder = value("folder")) == NULL)
            return(-1);
      if (*folder == '/')
            strlcpy(name, folder, namelen);
      else
            (void)snprintf(name, namelen, "%s/%s", homedir ? homedir : ".",
                folder);
      return(0);
}

/*
 * Return the name of the dead.letter file.
 */
char *
getdeadletter(void)
{
      char *cp;

      if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL)
            cp = expand("~/dead.letter");
      else if (*cp != '/') {
            char buf[PATHSIZE];

            (void)snprintf(buf, sizeof(buf), "~/%s", cp);
            cp = expand(buf);
      }
      return(cp);
}

/*
 * Signal handler used by readline() to catch SIGINT, SIGHUP, SIGTSTP,
 * SIGTTOU, SIGTTIN.
 */
void
fioint(int s)
{

      fiosignal = s;
}

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