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emacs/lib-src/fakemail.c
2005-08-07 10:56:27 +00:00

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/* sendmail-like interface to /bin/mail for system V,
Copyright (C) 1985, 1994, 1999, 2002, 2003, 2004,
2005 Free Software Foundation, Inc.
This file is part of GNU Emacs.
GNU Emacs is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Emacs; see the file COPYING. If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA 02110-1301, USA. */
#define NO_SHORTNAMES
#define _XOPEN_SOURCE 500 /* for cuserid */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#if defined (BSD_SYSTEM) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
/* This program isnot used in BSD, so just avoid loader complaints. */
int
main ()
{
return 0;
}
#else /* not BSD 4.2 (or newer) */
#ifdef MSDOS
int
main ()
{
return 0;
}
#else /* not MSDOS */
/* This conditional contains all the rest of the file. */
/* These are defined in config in some versions. */
#ifdef static
#undef static
#endif
#ifdef WINDOWSNT
#include "ntlib.h"
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <pwd.h>
/* This is to declare cuserid. */
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
/* Type definitions */
#define boolean int
#define true 1
#define false 0
/* Various lists */
struct line_record
{
char *string;
struct line_record *continuation;
};
typedef struct line_record *line_list;
struct header_record
{
line_list text;
struct header_record *next;
struct header_record *previous;
};
typedef struct header_record *header;
struct stream_record
{
FILE *handle;
int (*action)();
struct stream_record *rest_streams;
};
typedef struct stream_record *stream_list;
/* A `struct linebuffer' is a structure which holds a line of text.
* `readline' reads a line from a stream into a linebuffer
* and works regardless of the length of the line.
*/
struct linebuffer
{
long size;
char *buffer;
};
struct linebuffer lb;
#define new_list() \
((line_list) xmalloc (sizeof (struct line_record)))
#define new_header() \
((header) xmalloc (sizeof (struct header_record)))
#define new_stream() \
((stream_list) xmalloc (sizeof (struct stream_record)))
#define alloc_string(nchars) \
((char *) xmalloc ((nchars) + 1))
/* Global declarations */
#define BUFLEN 1024
#define KEYWORD_SIZE 256
#define FROM_PREFIX "From"
#define MY_NAME "fakemail"
#define NIL ((line_list) NULL)
#define INITIAL_LINE_SIZE 200
#ifndef MAIL_PROGRAM_NAME
#define MAIL_PROGRAM_NAME "/bin/mail"
#endif
static char *my_name;
static char *the_date;
static char *the_user;
static line_list file_preface;
static stream_list the_streams;
static boolean no_problems = true;
extern FILE *popen ();
extern int fclose (), pclose ();
#ifdef CURRENT_USER
extern struct passwd *getpwuid ();
extern unsigned short geteuid ();
static struct passwd *my_entry;
#define cuserid(s) \
(my_entry = getpwuid (((int) geteuid ())), \
my_entry->pw_name)
#endif
/* Utilities */
/* Print error message. `s1' is printf control string, `s2' is arg for it. */
static void
error (s1, s2)
char *s1, *s2;
{
printf ("%s: ", my_name);
printf (s1, s2);
printf ("\n");
no_problems = false;
}
/* Print error message and exit. */
static void
fatal (s1, s2)
char *s1, *s2;
{
error (s1, s2);
exit (EXIT_FAILURE);
}
/* Like malloc but get fatal error if memory is exhausted. */
static long *
xmalloc (size)
int size;
{
long *result = (long *) malloc (((unsigned) size));
if (result == ((long *) NULL))
fatal ("virtual memory exhausted", 0);
return result;
}
static long *
xrealloc (ptr, size)
long *ptr;
int size;
{
long *result = (long *) realloc (ptr, ((unsigned) size));
if (result == ((long *) NULL))
fatal ("virtual memory exhausted");
return result;
}
/* Initialize a linebuffer for use */
void
init_linebuffer (linebuffer)
struct linebuffer *linebuffer;
{
linebuffer->size = INITIAL_LINE_SIZE;
linebuffer->buffer = ((char *) xmalloc (INITIAL_LINE_SIZE));
}
/* Read a line of text from `stream' into `linebuffer'.
Return the length of the line. */
long
readline (linebuffer, stream)
struct linebuffer *linebuffer;
FILE *stream;
{
char *buffer = linebuffer->buffer;
char *p = linebuffer->buffer;
char *end = p + linebuffer->size;
while (true)
{
int c = getc (stream);
if (p == end)
{
linebuffer->size *= 2;
buffer = ((char *) xrealloc ((long *)buffer, linebuffer->size));
p = buffer + (p - linebuffer->buffer);
end = buffer + linebuffer->size;
linebuffer->buffer = buffer;
}
if (c < 0 || c == '\n')
{
*p = 0;
break;
}
*p++ = c;
}
return p - buffer;
}
/* Extract a colon-terminated keyword from the string FIELD.
Return that keyword as a string stored in a static buffer.
Store the address of the rest of the string into *REST.
If there is no keyword, return NULL and don't alter *REST. */
char *
get_keyword (field, rest)
register char *field;
char **rest;
{
static char keyword[KEYWORD_SIZE];
register char *ptr;
register int c;
ptr = &keyword[0];
c = (unsigned char) *field++;
if (isspace (c) || c == ':')
return ((char *) NULL);
*ptr++ = (islower (c) ? toupper (c) : c);
while (((c = (unsigned char) *field++) != ':') && ! isspace (c))
*ptr++ = (islower (c) ? toupper (c) : c);
*ptr++ = '\0';
while (isspace (c))
c = (unsigned char) *field++;
if (c != ':')
return ((char *) NULL);
*rest = field;
return &keyword[0];
}
/* Nonzero if the string FIELD starts with a colon-terminated keyword. */
boolean
has_keyword (field)
char *field;
{
char *ignored;
return (get_keyword (field, &ignored) != ((char *) NULL));
}
/* Store the string FIELD, followed by any lines in THE_LIST,
into the buffer WHERE.
Concatenate lines, putting just a space between them.
Delete everything contained in parentheses.
When a recipient name contains <...>, we discard
everything except what is inside the <...>.
We don't pay attention to overflowing WHERE;
the caller has to make it big enough. */
char *
add_field (the_list, field, where)
line_list the_list;
register char *field, *where;
{
register char c;
while (true)
{
char *this_recipient_where;
int in_quotes = 0;
*where++ = ' ';
this_recipient_where = where;
while ((c = *field++) != '\0')
{
if (c == '\\')
*where++ = c;
else if (c == '"')
{
in_quotes = ! in_quotes;
*where++ = c;
}
else if (in_quotes)
*where++ = c;
else if (c == '(')
{
while (*field && *field != ')') ++field;
if (! (*field++)) break; /* no close */
continue;
}
else if (c == ',')
{
*where++ = ' ';
/* When we get to the end of one recipient,
don't discard it if the next one has <...>. */
this_recipient_where = where;
}
else if (c == '<')
/* Discard everything we got before the `<'. */
where = this_recipient_where;
else if (c == '>')
/* Discard the rest of this name that follows the `>'. */
{
while (*field && *field != ',') ++field;
if (! (*field++)) break; /* no comma */
continue;
}
else
*where++ = c;
}
if (the_list == NIL) break;
field = the_list->string;
the_list = the_list->continuation;
}
return where;
}
line_list
make_file_preface ()
{
char *the_string, *temp;
long idiotic_interface;
long prefix_length;
long user_length;
long date_length;
line_list result;
prefix_length = strlen (FROM_PREFIX);
time (&idiotic_interface);
the_date = ctime (&idiotic_interface);
/* the_date has an unwanted newline at the end */
date_length = strlen (the_date) - 1;
the_date[date_length] = '\0';
temp = cuserid ((char *) NULL);
user_length = strlen (temp);
the_user = alloc_string (user_length + 1);
strcpy (the_user, temp);
the_string = alloc_string (3 + prefix_length
+ user_length
+ date_length);
temp = the_string;
strcpy (temp, FROM_PREFIX);
temp = &temp[prefix_length];
*temp++ = ' ';
strcpy (temp, the_user);
temp = &temp[user_length];
*temp++ = ' ';
strcpy (temp, the_date);
result = new_list ();
result->string = the_string;
result->continuation = ((line_list) NULL);
return result;
}
void
write_line_list (the_list, the_stream)
register line_list the_list;
FILE *the_stream;
{
for ( ;
the_list != ((line_list) NULL) ;
the_list = the_list->continuation)
{
fputs (the_list->string, the_stream);
putc ('\n', the_stream);
}
return;
}
int
close_the_streams ()
{
register stream_list rem;
for (rem = the_streams;
rem != ((stream_list) NULL);
rem = rem->rest_streams)
no_problems = (no_problems &&
((*rem->action) (rem->handle) == 0));
the_streams = ((stream_list) NULL);
return (no_problems ? EXIT_SUCCESS : EXIT_FAILURE);
}
void
add_a_stream (the_stream, closing_action)
FILE *the_stream;
int (*closing_action)();
{
stream_list old = the_streams;
the_streams = new_stream ();
the_streams->handle = the_stream;
the_streams->action = closing_action;
the_streams->rest_streams = old;
return;
}
int
my_fclose (the_file)
FILE *the_file;
{
putc ('\n', the_file);
fflush (the_file);
return fclose (the_file);
}
boolean
open_a_file (name)
char *name;
{
FILE *the_stream = fopen (name, "a");
if (the_stream != ((FILE *) NULL))
{
add_a_stream (the_stream, my_fclose);
if (the_user == ((char *) NULL))
file_preface = make_file_preface ();
write_line_list (file_preface, the_stream);
return true;
}
return false;
}
void
put_string (s)
char *s;
{
register stream_list rem;
for (rem = the_streams;
rem != ((stream_list) NULL);
rem = rem->rest_streams)
fputs (s, rem->handle);
return;
}
void
put_line (string)
char *string;
{
register stream_list rem;
for (rem = the_streams;
rem != ((stream_list) NULL);
rem = rem->rest_streams)
{
char *s = string;
int column = 0;
/* Divide STRING into lines. */
while (*s != 0)
{
char *breakpos;
/* Find the last char that fits. */
for (breakpos = s; *breakpos && column < 78; ++breakpos)
{
if (*breakpos == '\t')
column += 8;
else
column++;
}
/* If we didn't reach end of line, break the line. */
if (*breakpos)
{
/* Back up to just after the last comma that fits. */
while (breakpos != s && breakpos[-1] != ',') --breakpos;
if (breakpos == s)
{
/* If no comma fits, move past the first address anyway. */
while (*breakpos != 0 && *breakpos != ',') ++breakpos;
if (*breakpos != 0)
/* Include the comma after it. */
++breakpos;
}
}
/* Output that much, then break the line. */
fwrite (s, 1, breakpos - s, rem->handle);
column = 8;
/* Skip whitespace and prepare to print more addresses. */
s = breakpos;
while (*s == ' ' || *s == '\t') ++s;
if (*s != 0)
fputs ("\n\t", rem->handle);
}
putc ('\n', rem->handle);
}
return;
}
#define mail_error error
/* Handle an FCC field. FIELD is the text of the first line (after
the header name), and THE_LIST holds the continuation lines if any.
Call open_a_file for each file. */
void
setup_files (the_list, field)
register line_list the_list;
register char *field;
{
register char *start;
register char c;
while (true)
{
while (((c = *field) != '\0')
&& (c == ' '
|| c == '\t'
|| c == ','))
field += 1;
if (c != '\0')
{
start = field;
while (((c = *field) != '\0')
&& c != ' '
&& c != '\t'
&& c != ',')
field += 1;
*field = '\0';
if (!open_a_file (start))
mail_error ("Could not open file %s", start);
*field = c;
if (c != '\0') continue;
}
if (the_list == ((line_list) NULL))
return;
field = the_list->string;
the_list = the_list->continuation;
}
}
/* Compute the total size of all recipient names stored in THE_HEADER.
The result says how big to make the buffer to pass to parse_header. */
int
args_size (the_header)
header the_header;
{
register header old = the_header;
register line_list rem;
register int size = 0;
do
{
char *field;
register char *keyword = get_keyword (the_header->text->string, &field);
if ((strcmp (keyword, "TO") == 0)
|| (strcmp (keyword, "CC") == 0)
|| (strcmp (keyword, "BCC") == 0))
{
size += 1 + strlen (field);
for (rem = the_header->text->continuation;
rem != NIL;
rem = rem->continuation)
size += 1 + strlen (rem->string);
}
the_header = the_header->next;
} while (the_header != old);
return size;
}
/* Scan the header described by the lists THE_HEADER,
and put all recipient names into the buffer WHERE.
Precede each recipient name with a space.
Also, if the header has any FCC fields, call setup_files for each one. */
void
parse_header (the_header, where)
header the_header;
register char *where;
{
register header old = the_header;
do
{
char *field;
register char *keyword = get_keyword (the_header->text->string, &field);
if (strcmp (keyword, "TO") == 0)
where = add_field (the_header->text->continuation, field, where);
else if (strcmp (keyword, "CC") == 0)
where = add_field (the_header->text->continuation, field, where);
else if (strcmp (keyword, "BCC") == 0)
{
where = add_field (the_header->text->continuation, field, where);
the_header->previous->next = the_header->next;
the_header->next->previous = the_header->previous;
}
else if (strcmp (keyword, "FCC") == 0)
setup_files (the_header->text->continuation, field);
the_header = the_header->next;
} while (the_header != old);
*where = '\0';
return;
}
/* Read lines from the input until we get a blank line.
Create a list of `header' objects, one for each header field,
each of which points to a list of `line_list' objects,
one for each line in that field.
Continuation lines are grouped in the headers they continue. */
header
read_header ()
{
register header the_header = ((header) NULL);
register line_list *next_line = ((line_list *) NULL);
init_linebuffer (&lb);
do
{
long length;
register char *line;
readline (&lb, stdin);
line = lb.buffer;
length = strlen (line);
if (length == 0) break;
if (has_keyword (line))
{
register header old = the_header;
the_header = new_header ();
if (old == ((header) NULL))
{
the_header->next = the_header;
the_header->previous = the_header;
}
else
{
the_header->previous = old;
the_header->next = old->next;
old->next = the_header;
}
next_line = &(the_header->text);
}
if (next_line == ((line_list *) NULL))
{
/* Not a valid header */
exit (EXIT_FAILURE);
}
*next_line = new_list ();
(*next_line)->string = alloc_string (length);
strcpy (((*next_line)->string), line);
next_line = &((*next_line)->continuation);
*next_line = NIL;
} while (true);
return the_header->next;
}
void
write_header (the_header)
header the_header;
{
register header old = the_header;
do
{
register line_list the_list;
for (the_list = the_header->text;
the_list != NIL;
the_list = the_list->continuation)
put_line (the_list->string);
the_header = the_header->next;
} while (the_header != old);
put_line ("");
return;
}
int
main (argc, argv)
int argc;
char **argv;
{
char *command_line;
header the_header;
long name_length;
char *mail_program_name;
char buf[BUFLEN + 1];
register int size;
FILE *the_pipe;
extern char *getenv ();
mail_program_name = getenv ("FAKEMAILER");
if (!(mail_program_name && *mail_program_name))
mail_program_name = MAIL_PROGRAM_NAME;
name_length = strlen (mail_program_name);
my_name = MY_NAME;
the_streams = ((stream_list) NULL);
the_date = ((char *) NULL);
the_user = ((char *) NULL);
the_header = read_header ();
command_line = alloc_string (name_length + args_size (the_header));
strcpy (command_line, mail_program_name);
parse_header (the_header, &command_line[name_length]);
the_pipe = popen (command_line, "w");
if (the_pipe == ((FILE *) NULL))
fatal ("cannot open pipe to real mailer");
add_a_stream (the_pipe, pclose);
write_header (the_header);
/* Dump the message itself */
while (!feof (stdin))
{
size = fread (buf, 1, BUFLEN, stdin);
buf[size] = '\0';
put_string (buf);
}
exit (close_the_streams ());
}
#endif /* not MSDOS */
#endif /* not BSD 4.2 (or newer) */
/* arch-tag: acb0afa6-315a-4c5b-b9e3-def5725c8783
(do not change this comment) */
/* fakemail.c ends here */