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fakemail.c
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C/C++ Source or Header
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1996-09-28
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13KB
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610 lines
/* sendmail-like interface to /bin/mail for system V,
Copyright (C) 1985 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 1, 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, 675 Mass Ave, Cambridge, MA 02139, USA. */
#define NO_SHORTNAMES
#include "../src/config.h"
#if defined (BSD) && !defined (BSD4_1)
/* This program isnot used in BSD, so just avoid loader complaints. */
main ()
{
}
#else /* not BSD 4.2 (or newer) */
/* This conditional contains all the rest of the file. */
/* These are defined in config in some versions. */
#ifdef static
#undef static
#endif
#ifdef read
#undef read
#undef write
#undef open
#undef close
#endif
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <time.h>
#include <pwd.h>
/* 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 ();
extern char *malloc (), *realloc ();
#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 (1);
}
/* Like malloc but get fatal error if memory is exhausted. */
static char *
xmalloc (size)
int size;
{
char *result = malloc (((unsigned) size));
if (result == ((char *) NULL))
fatal ("virtual memory exhausted", 0);
return result;
}
static char *
xrealloc (ptr, size)
char *ptr;
int size;
{
char *result = realloc (ptr, ((unsigned) size));
if (result == ((char *) 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 (buffer, linebuffer->size));
p += buffer - linebuffer->buffer;
end += buffer - linebuffer->buffer;
linebuffer->buffer = buffer;
}
if (c < 0 || c == '\n')
{
*p = 0;
break;
}
*p++ = c;
}
return p - buffer;
}
char *
get_keyword (field, rest)
register char *field;
char **rest;
{
static char keyword[KEYWORD_SIZE];
register char *ptr;
register char c;
ptr = &keyword[0];
c = *field++;
if ((isspace (c)) || (c == ':'))
return ((char *) NULL);
*ptr++ = ((islower (c)) ? (toupper (c)) : c);
while (((c = *field++) != ':') && (!(isspace (c))))
*ptr++ = ((islower (c)) ? (toupper (c)) : c);
*ptr++ = '\0';
while (isspace (c)) c = *field++;
if (c != ':') return ((char *) NULL);
*rest = field;
return &keyword[0];
}
boolean
has_keyword (field)
char *field;
{
char *ignored;
return (get_keyword (field, &ignored) != ((char *) NULL));
}
char *
add_field (the_list, field, where)
line_list the_list;
register char *field, *where;
{
register char c;
while (true)
{
*where++ = ' ';
while ((c = *field++) != '\0')
*where++ = ((c == ',') ? ' ' : 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 ? 0 : 1);
}
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 (s)
char *s;
{
register stream_list rem;
for (rem = the_streams;
rem != ((stream_list) NULL);
rem = rem->rest_streams)
{
fputs (s, rem->handle);
putc ('\n', rem->handle);
}
return;
}
#define mail_error error
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;
}
}
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;
}
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;
}
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 (1);
}
*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;
}
void
main (argc, argv)
int argc;
char **argv;
{
char *command_line;
header the_header;
long name_length = strlen (MAIL_PROGRAM_NAME);
char buf[BUFLEN + 1];
register int size;
FILE *the_pipe;
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 BSD 4.2 (or newer) */