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/* $OpenBSD: fio.c,v 1.36 2015/10/16 18:21:43 mmcc Exp $ */ |
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/* $NetBSD: fio.c,v 1.8 1997/07/07 22:57:55 phil Exp $ */ |
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/* |
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* Copyright (c) 1980, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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*/ |
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#include "rcv.h" |
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#include <sys/file.h> |
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#include <sys/wait.h> |
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#include <unistd.h> |
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#include <paths.h> |
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#include <errno.h> |
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#include <glob.h> |
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#include "extern.h" |
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/* |
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* Mail -- a mail program |
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* |
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* File I/O. |
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*/ |
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static volatile sig_atomic_t fiosignal; |
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/* |
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* Wrapper for read() to catch EINTR. |
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*/ |
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static ssize_t |
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myread(int fd, char *buf, int len) |
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{ |
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ssize_t nread; |
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while ((nread = read(fd, buf, len)) == -1 && errno == EINTR) |
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; |
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return(nread); |
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} |
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/* |
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* Set up the input pointers while copying the mail file into /tmp. |
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*/ |
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void |
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setptr(FILE *ibuf, off_t offset) |
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{ |
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int c, count; |
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char *cp, *cp2; |
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struct message this; |
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FILE *mestmp; |
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int maybe, inhead, omsgCount; |
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char linebuf[LINESIZE], pathbuf[PATHSIZE]; |
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|
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/* Get temporary file. */ |
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(void)snprintf(pathbuf, sizeof(pathbuf), "%s/mail.XXXXXXXXXX", tmpdir); |
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if ((c = mkstemp(pathbuf)) == -1 || (mestmp = Fdopen(c, "r+")) == NULL) |
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err(1, "can't open %s", pathbuf); |
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(void)rm(pathbuf); |
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if (offset == 0) { |
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msgCount = 0; |
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} else { |
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/* Seek into the file to get to the new messages */ |
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(void)fseeko(ibuf, offset, SEEK_SET); |
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/* |
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* We need to make "offset" a pointer to the end of |
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* the temp file that has the copy of the mail file. |
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* If any messages have been edited, this will be |
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* different from the offset into the mail file. |
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*/ |
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(void)fseeko(otf, (off_t)0, SEEK_END); |
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offset = ftell(otf); |
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} |
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omsgCount = msgCount; |
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maybe = 1; |
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inhead = 0; |
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this.m_flag = MUSED|MNEW; |
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this.m_size = 0; |
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this.m_lines = 0; |
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this.m_block = 0; |
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this.m_offset = 0; |
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for (;;) { |
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if (fgets(linebuf, sizeof(linebuf), ibuf) == NULL) { |
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if (append(&this, mestmp)) |
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err(1, "temporary file"); |
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makemessage(mestmp, omsgCount); |
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return; |
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} |
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count = strlen(linebuf); |
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/* |
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* Transforms lines ending in <CR><LF> to just <LF>. |
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* This allows mail to be able to read Eudora mailboxes |
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* that reside on a DOS partition. |
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*/ |
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if (count >= 2 && linebuf[count-1] == '\n' && |
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linebuf[count - 2] == '\r') { |
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linebuf[count - 2] = '\n'; |
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linebuf[count - 1] = '\0'; |
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count--; |
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} |
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(void)fwrite(linebuf, sizeof(*linebuf), count, otf); |
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if (ferror(otf)) |
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err(1, "%s", pathbuf); |
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if (count && linebuf[count - 1] == '\n') |
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linebuf[count - 1] = '\0'; |
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if (maybe && linebuf[0] == 'F' && ishead(linebuf)) { |
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msgCount++; |
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if (append(&this, mestmp)) |
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err(1, "temporary file"); |
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this.m_flag = MUSED|MNEW; |
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this.m_size = 0; |
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this.m_lines = 0; |
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this.m_block = blockof(offset); |
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this.m_offset = offsetof(offset); |
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inhead = 1; |
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} else if (linebuf[0] == 0) { |
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inhead = 0; |
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} else if (inhead) { |
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for (cp = linebuf, cp2 = "status";; cp++) { |
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if ((c = (unsigned char)*cp2++) == 0) { |
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while (isspace((unsigned char)*cp++)) |
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; |
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if (cp[-1] != ':') |
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break; |
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while ((c = (unsigned char)*cp++) != '\0') |
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if (c == 'R') |
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this.m_flag |= MREAD; |
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else if (c == 'O') |
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this.m_flag &= ~MNEW; |
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inhead = 0; |
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break; |
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} |
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if (*cp != c && *cp != toupper(c)) |
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break; |
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} |
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} |
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offset += count; |
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this.m_size += count; |
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this.m_lines++; |
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maybe = linebuf[0] == 0; |
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} |
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} |
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/* |
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* Drop the passed line onto the passed output buffer. |
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* If a write error occurs, return -1, else the count of |
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* characters written, including the newline if requested. |
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*/ |
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int |
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putline(FILE *obuf, char *linebuf, int outlf) |
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{ |
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int c; |
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c = strlen(linebuf); |
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(void)fwrite(linebuf, sizeof(*linebuf), c, obuf); |
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if (outlf) { |
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(void)putc('\n', obuf); |
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c++; |
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} |
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if (ferror(obuf)) |
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return(-1); |
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return(c); |
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} |
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/* |
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* Read up a line from the specified input into the line |
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* buffer. Return the number of characters read. Do not |
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* include the newline (or carriage return) at the end. |
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*/ |
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int |
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readline(FILE *ibuf, char *linebuf, int linesize, int *signo) |
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{ |
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struct sigaction act; |
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struct sigaction savetstp; |
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struct sigaction savettou; |
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struct sigaction savettin; |
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struct sigaction saveint; |
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struct sigaction savehup; |
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sigset_t oset; |
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int n; |
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/* |
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* Setup signal handlers if the caller asked us to catch signals. |
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* Note that we do not restart system calls since we need the |
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* read to be interruptible. |
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*/ |
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if (signo) { |
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fiosignal = 0; |
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sigemptyset(&act.sa_mask); |
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act.sa_flags = 0; |
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act.sa_handler = fioint; |
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if (sigaction(SIGINT, NULL, &saveint) == 0 && |
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saveint.sa_handler != SIG_IGN) { |
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(void)sigaction(SIGINT, &act, &saveint); |
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(void)sigprocmask(SIG_UNBLOCK, &intset, &oset); |
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} |
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if (sigaction(SIGHUP, NULL, &savehup) == 0 && |
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savehup.sa_handler != SIG_IGN) |
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(void)sigaction(SIGHUP, &act, &savehup); |
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(void)sigaction(SIGTSTP, &act, &savetstp); |
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(void)sigaction(SIGTTOU, &act, &savettou); |
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(void)sigaction(SIGTTIN, &act, &savettin); |
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} |
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clearerr(ibuf); |
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if (fgets(linebuf, linesize, ibuf) == NULL) { |
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if (ferror(ibuf)) |
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clearerr(ibuf); |
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n = -1; |
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} else { |
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n = strlen(linebuf); |
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if (n > 0 && linebuf[n - 1] == '\n') |
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linebuf[--n] = '\0'; |
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if (n > 0 && linebuf[n - 1] == '\r') |
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linebuf[--n] = '\0'; |
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} |
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if (signo) { |
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(void)sigprocmask(SIG_SETMASK, &oset, NULL); |
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(void)sigaction(SIGINT, &saveint, NULL); |
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(void)sigaction(SIGHUP, &savehup, NULL); |
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(void)sigaction(SIGTSTP, &savetstp, NULL); |
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(void)sigaction(SIGTTOU, &savettou, NULL); |
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(void)sigaction(SIGTTIN, &savettin, NULL); |
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*signo = fiosignal; |
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} |
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return(n); |
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} |
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/* |
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* Return a file buffer all ready to read up the |
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* passed message pointer. |
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*/ |
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FILE * |
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setinput(struct message *mp) |
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{ |
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fflush(otf); |
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if (fseek(itf, (long)positionof(mp->m_block, mp->m_offset), SEEK_SET) |
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< 0) |
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err(1, "fseek"); |
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return(itf); |
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} |
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/* |
271 |
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* Take the data out of the passed ghost file and toss it into |
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* a dynamically allocated message structure. |
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*/ |
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void |
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makemessage(FILE *f, int omsgCount) |
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{ |
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size_t size; |
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struct message *nmessage; |
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280 |
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size = (msgCount + 1) * sizeof(struct message); |
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nmessage = realloc(message, size); |
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if (nmessage == 0) |
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err(1, "realloc"); |
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if (omsgCount == 0 || message == NULL) |
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dot = nmessage; |
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else |
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dot = nmessage + (dot - message); |
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message = nmessage; |
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size -= (omsgCount + 1) * sizeof(struct message); |
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fflush(f); |
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(void)lseek(fileno(f), (off_t)sizeof(*message), SEEK_SET); |
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if (myread(fileno(f), (void *) &message[omsgCount], size) != size) |
293 |
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errx(1, "Message temporary file corrupted"); |
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message[msgCount].m_size = 0; |
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message[msgCount].m_lines = 0; |
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(void)Fclose(f); |
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} |
298 |
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299 |
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/* |
300 |
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* Append the passed message descriptor onto the temp file. |
301 |
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* If the write fails, return 1, else 0 |
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*/ |
303 |
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int |
304 |
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append(struct message *mp, FILE *f) |
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{ |
306 |
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307 |
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return(fwrite((char *) mp, sizeof(*mp), 1, f) != 1); |
308 |
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} |
309 |
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310 |
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/* |
311 |
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* Delete or truncate a file, but only if the file is a plain file. |
312 |
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*/ |
313 |
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int |
314 |
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rm(char *name) |
315 |
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{ |
316 |
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struct stat sb; |
317 |
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318 |
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if (stat(name, &sb) < 0) |
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return(-1); |
320 |
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if (!S_ISREG(sb.st_mode)) { |
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errno = EISDIR; |
322 |
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return(-1); |
323 |
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} |
324 |
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if (unlink(name) == -1) { |
325 |
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if (errno == EPERM) |
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return(truncate(name, (off_t)0)); |
327 |
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else |
328 |
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return(-1); |
329 |
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} |
330 |
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return(0); |
331 |
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} |
332 |
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333 |
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static int sigdepth; /* depth of holdsigs() */ |
334 |
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static sigset_t nset, oset; |
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/* |
336 |
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* Hold signals SIGHUP, SIGINT, and SIGQUIT. |
337 |
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*/ |
338 |
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void |
339 |
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holdsigs(void) |
340 |
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{ |
341 |
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342 |
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if (sigdepth++ == 0) { |
343 |
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sigemptyset(&nset); |
344 |
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sigaddset(&nset, SIGHUP); |
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sigaddset(&nset, SIGINT); |
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sigaddset(&nset, SIGQUIT); |
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sigprocmask(SIG_BLOCK, &nset, &oset); |
348 |
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} |
349 |
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} |
350 |
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351 |
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/* |
352 |
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* Release signals SIGHUP, SIGINT, and SIGQUIT. |
353 |
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*/ |
354 |
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void |
355 |
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relsesigs(void) |
356 |
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{ |
357 |
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|
358 |
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if (--sigdepth == 0) |
359 |
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sigprocmask(SIG_SETMASK, &oset, NULL); |
360 |
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} |
361 |
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|
362 |
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/* |
363 |
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* Unblock and ignore a signal |
364 |
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*/ |
365 |
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int |
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ignoresig(int sig, struct sigaction *oact, sigset_t *oset) |
367 |
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{ |
368 |
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struct sigaction act; |
369 |
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sigset_t nset; |
370 |
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int error; |
371 |
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|
372 |
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sigemptyset(&act.sa_mask); |
373 |
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act.sa_flags = SA_RESTART; |
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act.sa_handler = SIG_IGN; |
375 |
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error = sigaction(sig, &act, oact); |
376 |
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|
377 |
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if (error == 0) { |
378 |
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sigemptyset(&nset); |
379 |
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sigaddset(&nset, sig); |
380 |
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(void)sigprocmask(SIG_UNBLOCK, &nset, oset); |
381 |
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} else if (oset != NULL) |
382 |
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(void)sigprocmask(SIG_BLOCK, NULL, oset); |
383 |
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|
384 |
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return(error); |
385 |
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} |
386 |
|
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|
387 |
|
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/* |
388 |
|
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* Determine the size of the file possessed by |
389 |
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* the passed buffer. |
390 |
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*/ |
391 |
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off_t |
392 |
|
|
fsize(FILE *iob) |
393 |
|
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{ |
394 |
|
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struct stat sbuf; |
395 |
|
|
|
396 |
|
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if (fstat(fileno(iob), &sbuf) < 0) |
397 |
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return(0); |
398 |
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return(sbuf.st_size); |
399 |
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} |
400 |
|
|
|
401 |
|
|
/* |
402 |
|
|
* Evaluate the string given as a new mailbox name. |
403 |
|
|
* Supported meta characters: |
404 |
|
|
* % for my system mail box |
405 |
|
|
* %user for user's system mail box |
406 |
|
|
* # for previous file |
407 |
|
|
* & invoker's mbox file |
408 |
|
|
* +file file in folder directory |
409 |
|
|
* any shell meta character |
410 |
|
|
* Return the file name as a dynamic string. |
411 |
|
|
*/ |
412 |
|
|
char * |
413 |
|
|
expand(char *name) |
414 |
|
|
{ |
415 |
|
|
const int flags = GLOB_BRACE|GLOB_TILDE|GLOB_NOSORT; |
416 |
|
|
char xname[PATHSIZE]; |
417 |
|
|
char cmdbuf[PATHSIZE]; /* also used for file names */ |
418 |
|
|
char *match = NULL; |
419 |
|
|
glob_t names; |
420 |
|
|
|
421 |
|
|
/* |
422 |
|
|
* The order of evaluation is "%" and "#" expand into constants. |
423 |
|
|
* "&" can expand into "+". "+" can expand into shell meta characters. |
424 |
|
|
* Shell meta characters expand into constants. |
425 |
|
|
* This way, we make no recursive expansion. |
426 |
|
|
*/ |
427 |
|
|
switch (*name) { |
428 |
|
|
case '%': |
429 |
|
|
findmail(name[1] ? name + 1 : myname, xname, sizeof(xname)); |
430 |
|
|
return(savestr(xname)); |
431 |
|
|
case '#': |
432 |
|
|
if (name[1] != 0) |
433 |
|
|
break; |
434 |
|
|
if (prevfile[0] == 0) { |
435 |
|
|
puts("No previous file"); |
436 |
|
|
return(NULL); |
437 |
|
|
} |
438 |
|
|
return(savestr(prevfile)); |
439 |
|
|
case '&': |
440 |
|
|
if (name[1] == 0 && (name = value("MBOX")) == NULL) |
441 |
|
|
name = "~/mbox"; |
442 |
|
|
/* fall through */ |
443 |
|
|
} |
444 |
|
|
if (name[0] == '+' && getfold(cmdbuf, sizeof(cmdbuf)) >= 0) { |
445 |
|
|
(void)snprintf(xname, sizeof(xname), "%s/%s", cmdbuf, name + 1); |
446 |
|
|
name = savestr(xname); |
447 |
|
|
} |
448 |
|
|
/* catch the most common shell meta character */ |
449 |
|
|
if (name[0] == '~' && homedir && (name[1] == '/' || name[1] == '\0')) { |
450 |
|
|
(void)snprintf(xname, sizeof(xname), "%s%s", homedir, name + 1); |
451 |
|
|
name = savestr(xname); |
452 |
|
|
} |
453 |
|
|
if (strpbrk(name, "~{[*?\\") == NULL) |
454 |
|
|
return(savestr(name)); |
455 |
|
|
|
456 |
|
|
/* XXX - does not expand enviroment variables. */ |
457 |
|
|
switch (glob(name, flags, NULL, &names)) { |
458 |
|
|
case 0: |
459 |
|
|
if (names.gl_pathc == 1) |
460 |
|
|
match = savestr(names.gl_pathv[0]); |
461 |
|
|
else |
462 |
|
|
fprintf(stderr, "\"%s\": Ambiguous.\n", name); |
463 |
|
|
break; |
464 |
|
|
case GLOB_NOSPACE: |
465 |
|
|
fprintf(stderr, "\"%s\": Out of memory.\n", name); |
466 |
|
|
break; |
467 |
|
|
case GLOB_NOMATCH: |
468 |
|
|
fprintf(stderr, "\"%s\": No match.\n", name); |
469 |
|
|
break; |
470 |
|
|
default: |
471 |
|
|
fprintf(stderr, "\"%s\": Expansion failed.\n", name); |
472 |
|
|
break; |
473 |
|
|
} |
474 |
|
|
globfree(&names); |
475 |
|
|
return(match); |
476 |
|
|
} |
477 |
|
|
|
478 |
|
|
/* |
479 |
|
|
* Determine the current folder directory name. |
480 |
|
|
*/ |
481 |
|
|
int |
482 |
|
|
getfold(char *name, int namelen) |
483 |
|
|
{ |
484 |
|
|
char *folder; |
485 |
|
|
|
486 |
|
|
if ((folder = value("folder")) == NULL) |
487 |
|
|
return(-1); |
488 |
|
|
if (*folder == '/') |
489 |
|
|
strlcpy(name, folder, namelen); |
490 |
|
|
else |
491 |
|
|
(void)snprintf(name, namelen, "%s/%s", homedir ? homedir : ".", |
492 |
|
|
folder); |
493 |
|
|
return(0); |
494 |
|
|
} |
495 |
|
|
|
496 |
|
|
/* |
497 |
|
|
* Return the name of the dead.letter file. |
498 |
|
|
*/ |
499 |
|
|
char * |
500 |
|
|
getdeadletter(void) |
501 |
|
|
{ |
502 |
|
|
char *cp; |
503 |
|
|
|
504 |
|
|
if ((cp = value("DEAD")) == NULL || (cp = expand(cp)) == NULL) |
505 |
|
|
cp = expand("~/dead.letter"); |
506 |
|
|
else if (*cp != '/') { |
507 |
|
|
char buf[PATHSIZE]; |
508 |
|
|
|
509 |
|
|
(void)snprintf(buf, sizeof(buf), "~/%s", cp); |
510 |
|
|
cp = expand(buf); |
511 |
|
|
} |
512 |
|
|
return(cp); |
513 |
|
|
} |
514 |
|
|
|
515 |
|
|
/* |
516 |
|
|
* Signal handler used by readline() to catch SIGINT, SIGHUP, SIGTSTP, |
517 |
|
|
* SIGTTOU, SIGTTIN. |
518 |
|
|
*/ |
519 |
|
|
void |
520 |
|
|
fioint(int s) |
521 |
|
|
{ |
522 |
|
|
|
523 |
|
|
fiosignal = s; |
524 |
|
|
} |