Initial revision

lib-src/fakemail.c

@@ -0,0 +1,627 @@
+/* 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 distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY.  No author or distributor
+accepts responsibility to anyone for the consequences of using it
+or for whether it serves any particular purpose or works at all,
+unless he says so in writing.  Refer to the GNU Emacs General Public
+License for full details.
+
+Everyone is granted permission to copy, modify and redistribute
+GNU Emacs, but only under the conditions described in the
+GNU Emacs General Public License.   A copy of this license is
+supposed to have been given to you along with GNU Emacs so you
+can know your rights and responsibilities.  It should be in a
+file named COPYING.  Among other things, the copyright notice
+and this notice must be preserved on all copies.  */
+
+
+#define NO_SHORTNAMES
+#include "../src/config.h"
+
+#if defined (BSD) && !defined (BSD4_1) && !defined (USE_FAKEMAIL)
+/* 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')
+	{
+	  if (c == '(')
+	    {
+	      while (*field && *field != ')') ++field;
+	      if (! (*field++)) break; /* no closer */
+	      if (! (*field))   break; /* closerNULL */
+	      c = *field;
+	    }
+	  *where++ = ((c == ','||c=='>'||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;
+  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 BSD 4.2 (or newer) */