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altermime.c
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altermime.c
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/*------------------------------------------------------------------------
Module: /extra/development/altermime-0.1.1/altermime.c
Author: Paul L Daniels
Project: AlterMime
State: Development
Creation Date: 02/05/2001
Description: Altermime is a program/object which will allow arbitary alterations to a given MIME encoded mailpack, such as disclaimer additions and attachment-nullification.
------------------------------------------------------------------------*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <sys/types.h>
#include <unistd.h>
#include <errno.h>
#include "mime_alter.h"
#include "logger.h"
/* Global DEFINES */
char ALTERMIMEAPP_VERSION[]="alterMIME v0.3.11 (November-2008) by Paul L Daniels - http://www.pldaniels.com/altermime\n";
char ALTERMIMEAPP_USAGE[]="altermime --input=<input mime pack> ( --input=- for stdin )\n"
" [--disclaimer=<disclaimer file>]\n"
" [--disclaimer-html=<HTML disclaimer file>]\n"
" [--disclaimer-b64=<BASE64 encoded dislcaimer>]\n"
" [--htmltoo]\n"
#ifdef DISPOS
" [--textpos=<positioning code>]\n"
" [--htmlpos=<positioning code>]\n"
#endif
#ifdef ALTERMIME_PRETEXT
/*" [--pretext] Insert disclaimer files in pretext mode.\n"*/ // By implication, pretext is inserted based on the file status below.
" [--pretext=<pretext file>]\n"
" [--pretext-html=<pretext HTML file>]\n"
" [--pretext-b64=<BASE64 encoded pretext >]\n"
#endif
" [--force-into-b64]\n"
" [--force-for-bad-html]\n"
" [--multipart-insert]\n"
" [--remove=<remove file name (regex)>] (if filename contains a /, matches on mime-type )\n"
" [--removeall]\n"
" [--replace=<filename to replace> --with=<replace with>]\n"
" [--xheader=\"...\"\n"
" [--alter-header=\"...\" --alter-with=\"...\" --alter-mode=<prefix|suffix|replace>]\n"
" [--altersigned]\n"
" [--tmpdir=<directory>\n"
" [--no-qmail-bounce]\n"
" [--verbose]\n"
" [--log-stdout]\n"
" [--log-stderr]\n"
" [--log-syslog]\n"
" [--debug]\n"
" [--version]\n\n"
"Option Descriptions:\n"
"\t--input=, Sets the mailpack file to be the filename supplied,\n"
"\t\tif the filename is a single '-' (hyphen) then the mailpack\n"
"\t\tis sourced via stdin and outputted via stdout.\n"
"\n"
"\t--disclaimer=, Set the plaintext disclaimer source file.\n"
"\t--disclaimer-html=, Set the HTML disclaimer source file.\n"
"\t--disclaimer-b64=, Set the BASE64 encoded disclaimer source file (implies --force-into-b64).\n"
"\n"
"\t--htmltoo, Sets alterMIME to insert the plaintext disclaimer into\n"
"\t--force-into-b64, Sets alterMIME to insert disclaimers into BASE64 encoded text segments\n"
"\t--force-for-bad-html, Force adding of the HTML disclaimer even when HTML is not correctly formatted\n"
"\t\tthe HTML portion of the email body ( if there is no explicitly\n"
"\t\tdefined HTML dislcaimer, see --disclaimer-html )\n"
"\n"
"\t--disclaimer-attachment=<filename> (use $CID in the disclaimer text to reference)\n"
"\n"
"\t--remove=, Remove any attachments which match the filename supplied,\n"
"\t\tif the filename text contains a forward-slash '/', then the\n"
"\t\tmatching will occur based on content-type headers rather than\n"
"\t\tby filename.\n"
"\t--removeall, Remove all attachments\n"
"\t--replace=, Replace attachments matching the given filename. Requires to\n"
"\t\tbe used with --with.\n"
"\t--with=, Replace the attachments specified by --replace with the file\n"
"\t\tspecified.\n"
"\t--xheader=, Insert a header line as specified into the first set of headers.\n"
"\t--alter-header=\"...\" --alter-with=\"...\" --alter-mode=(prefix|suffix|replace)\n"
"\t\tAlter an existing header in the mailpack. This function modifies the\n"
"\t\tvalue of the header, as apposed to the header name.\n"
"\t--altersigned, Force alterMIME to modify 'signed' emails\n"
"\t--tmpdir=<directory>, where to store temporary files when processing from STDIN\n"
"\t--no-qmail-bounce, Don't search into email bodies for attachment headers\n"
"\t--verbose, Describe details of the process occuring\n"
"\t--log-stdout, Send all output messages to stdout\n"
"\t--log-stderr, Send all output messages to stderr\n"
"\t--log-syslog, Send all output messages to syslog\n"
"\t--debug, Provide greater verbosity and debugging information\n"
"\t--version, display the alterMIME version string\n"
"\n";
/* Global variables / settings */
char ALTERMIMEAPP_default_remove_prefix[]="removed";
char ALTERMIMEAPP_removeall_filename[]=".*";
struct ALTERMIMEAPP_globals {
char tmpdir[1024];
char *input_file;
int input_is_stdin;
char *disclaimer_file;
char *disclaimer_html_file;
char *disclaimer_b64_file;
char *disclaimer_attachment;
int disclaimer_insert;
char *pretext_file;
char *pretext_html_file;
char *pretext_b64_file;
int pretext_insert;
char *remove_filename;
char *replace;
char *with;
char *xheader;
char *alter_header;
char *alter_with;
int alter_mode;
int verbose;
};
/*------------------------------------------------------------------------
Procedure: parse_args ID:1
Purpose: Parses the command line arguments and sets up internal parameters
Input: argc: The number of arguments
argv: Array of strings
Output: none
Errors:
------------------------------------------------------------------------*/
int ALTERMIMEAPP_parse_args( struct ALTERMIMEAPP_globals *glb, int argc, char **argv )
{
int i;
char *p=NULL;
char *q=NULL;
for (i = 1; i < argc; i++){
if ((argv[i][0] == '-')&&(argv[i][1] == '-'))
{
p = argv[i];
p += 2;
if (strncmp(p,"input=",6)==0) {
glb->input_file = p +strlen("input=");
} else if (strncmp(p,"tmpdir=",7)==0) {
snprintf(glb->tmpdir, sizeof(glb->tmpdir), "%s" ,p +strlen("tmpdir="));
} else if (strncmp(p,"htmltoo",7)==0) {
AM_set_HTMLtoo(1);
} else if (strncmp(p,"force-into-b64",sizeof("force-into-b64"))==0) {
AM_set_force_into_b64(1);
} else if (strncmp(p,"force-for-bad-html",sizeof("force-for-bad-html"))==0) {
AM_set_force_for_bad_html(1);
} else if (strncmp(p,"multipart-insert", strlen("multipart-insert"))==0) {
AM_set_multipart_insert(1);
} else if (strncmp(p,"pretext=", strlen("pretext="))==0) {
glb->pretext_file = p +strlen("pretext=");
glb->pretext_insert = 1;
// LOGGER_log("%s:%d:ALTERMIMEAPP_parse_args:DEBUG: pretext set to '%s'", FL, glb->pretext_file);
} else if (strncmp(p,"pretext-html=",strlen("pretext-html="))==0) {
glb->pretext_html_file = p +strlen("pretext-html=");
AM_set_HTMLtoo(1);
glb->pretext_insert = 1;
} else if (strncmp(p,"pretext-b64=",strlen("pretext-b64="))==0) {
glb->pretext_html_file = p +strlen("pretext-b64=");
AM_set_force_into_b64(1);
glb->pretext_insert = 1;
} else if (strncmp(p,"disclaimer=",11)==0) {
glb->disclaimer_file = p +strlen("disclaimer=");
AM_set_disclaimer_plain( glb->disclaimer_file, AM_DISCLAIMER_TYPE_FILENAME );
glb->disclaimer_insert = 1;
} else if (strncmp(p,"disclaimer-html=",16)==0) {
glb->disclaimer_html_file = p +strlen("disclaimer-html=");
AM_set_disclaimer_HTML( glb->disclaimer_html_file, AM_DISCLAIMER_TYPE_FILENAME );
glb->disclaimer_insert = 1;
AM_set_HTMLtoo(1);
} else if (strncmp(p,"disclaimer-b64=",strlen("disclaimer-b64="))==0) {
glb->disclaimer_b64_file = p +strlen("disclaimer-b64=");
AM_set_disclaimer_b64( glb->disclaimer_b64_file, AM_DISCLAIMER_TYPE_FILENAME );
glb->disclaimer_insert = 1;
AM_set_force_into_b64(1);
} else if (strncmp(p,"disclaimer-attachment=",strlen("disclaimer-attachment="))==0) {
glb->disclaimer_attachment = p +strlen("disclaimer-attachment=");
AM_set_disclaimer_attachment( glb->disclaimer_attachment, 0);
} else if (strncmp(p,"remove=",7)==0) {
glb->remove_filename = p +strlen("remove=");
} else if (strncmp(p, "remove_prefix=",13)==0) {
LOGGER_log("--remove_prefix is depricated, ignoring");
//glb->remove_prefix = p +strlen("remove_prefix=");
//
} else if (strncmp(p, "removeall",9)==0) {
glb->remove_filename = ALTERMIMEAPP_removeall_filename;
} else if (strncmp(p, "altersigned",11)==0) {
AM_set_altersigned(1);
} else if (strncmp(p, "replace",7)==0) {
glb->replace = p +strlen("replace=");
} else if (strncmp(p, "with",4)==0) {
glb->with = p +strlen("with=");
} else if (strncmp(p, "xheader",7)==0) {
glb->xheader = p +strlen("xheader=");
} else if (strncmp(p, "version",7)==0) {
fprintf(stdout,"%s",ALTERMIMEAPP_VERSION);
exit(0);
} else if (strncmp(p, "debug", 5)==0) {
AM_set_debug(1);
} else if (strncmp(p, "no-qmail-bounce",15)==0) {
AM_set_header_long_search(0);
} else if (strncmp(p, "verbose",7)==0) {
AM_set_verbose(1);
} else if (strncmp(p, "alter-header", strlen("alter-header"))==0) {
glb->alter_header = p +strlen("alter-header=");
if (*glb->alter_header == '\"') glb->alter_header++;
} else if (strncmp(p, "alter-with", strlen("alter-with"))==0) {
glb->alter_with = p +strlen("alter-with=");
if (*glb->alter_with == '\"') glb->alter_with++;
} else if (strncmp(p, "alter-mode", strlen("alter-mode"))==0) {
q = p +strlen("alter-mode=");
if (*q == '\"') q++;
glb->alter_mode = AM_HEADER_ADJUST_MODE_NONE;
if (strncmp( q, "prefix", strlen("prefix"))==0) { glb->alter_mode = AM_HEADER_ADJUST_MODE_PREFIX; }
else if (strncmp( q, "suffix", strlen("suffix"))==0) { glb->alter_mode = AM_HEADER_ADJUST_MODE_SUFFIX; }
else if (strncmp( q, "replace", strlen("replace"))==0) { glb->alter_mode = AM_HEADER_ADJUST_MODE_REPLACE; }
else { LOGGER_log("ERROR: Unknown header alter mode '%s'. Please use either of prefix, suffix or replace.", q); }
}
else if (strncmp(p, "log-stdout",strlen("log-stdout"))==0) { LOGGER_set_output_mode(_LOGGER_STDOUT); }
else if (strncmp(p, "log-stderr",strlen("log-stderr"))==0) { LOGGER_set_output_mode(_LOGGER_STDERR); }
else if (strncmp(p, "log-syslog",strlen("log-syslog"))==0) { LOGGER_set_output_mode(_LOGGER_SYSLOG); LOGGER_set_syslog_mode( LOG_MAIL|LOG_INFO ); }
else
{
LOGGER_log("Error, unknown parameter \"%s\"\n",p);
LOGGER_log("%s",ALTERMIMEAPP_USAGE);
exit(1);
} /* if-ELSE */
} /* if argv == '--' */
} /* for */
return 0;
}
/*-----------------------------------------------------------------\
Function Name : ALTERMIMEAPP_init
Returns Type : int
----Parameter List
1. struct ALTERMIMEAPP_globals *glb ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int ALTERMIMEAPP_init( struct ALTERMIMEAPP_globals *glb )
{
glb->input_is_stdin = 0;
glb->input_file = NULL;
glb->disclaimer_file = NULL;
glb->disclaimer_html_file = NULL;
glb->disclaimer_b64_file = NULL;
glb->disclaimer_insert = 0;
#ifdef ALTERMIME_PRETEXT
glb->pretext_insert = 0;
glb->pretext_file = NULL;
glb->pretext_html_file = NULL;
glb->pretext_b64_file = NULL;
#endif
glb->remove_filename = NULL;
glb->replace = NULL;
glb->with = NULL;
glb->xheader = NULL;
glb->verbose = 0;
glb->alter_header = NULL;
glb->alter_with = NULL;
glb->alter_mode = AM_HEADER_ADJUST_MODE_NONE;
snprintf(glb->tmpdir, sizeof(glb->tmpdir),"/tmp");
return 0;
}
/*-----------------------------------------------------------------\
Function Name : main
Returns Type : int
----Parameter List
1. int argc,
2. char **argv ,
------------------
Exit Codes :
Side Effects :
--------------------------------------------------------------------
Comments:
--------------------------------------------------------------------
Changes:
\------------------------------------------------------------------*/
int main( int argc, char **argv )
{
struct ALTERMIMEAPP_globals glb;
FILE *f;
LOGGER_set_output_mode(_LOGGER_STDOUT);
ALTERMIMEAPP_init( &glb );
ALTERMIMEAPP_parse_args(&glb,argc, argv);
if (!glb.input_file) {
LOGGER_log("Error: No input file specified\n");
LOGGER_log(ALTERMIMEAPP_USAGE);
exit(1);
}
if (((!glb.replace)&&(glb.with))||((glb.replace)&&(!glb.with)))
{
LOGGER_log("Error: Both --replace= and --with= must be set\n");
exit(1);
}
if( glb.input_file && !(glb.alter_mode||glb.replace||glb.disclaimer_file||glb.remove_filename||glb.xheader||glb.pretext_file||glb.pretext_html_file)) {
LOGGER_log("Error: Must specify an action for the input file.\n");
LOGGER_log( ALTERMIMEAPP_USAGE);
exit(1);
}
if ((strcmp(glb.input_file,"-") == 0) && (/**glb.disclaimer_file||**/glb.replace||glb.xheader)) {
LOGGER_log("Error: reading/writing from stdin/stdout not implemented for --xheader,--disclaimer, or --replace.\n");
LOGGER_log(ALTERMIMEAPP_USAGE);
exit(1);
}
if (glb.input_file[0]=='-') {
char scratch[1024];
size_t rc;
glb.input_is_stdin = 1;
snprintf(scratch,sizeof(scratch),"%s/%ld%d.amtmp", glb.tmpdir, time(NULL), getpid());
// free(glb.input_file);
glb.input_file = strdup(scratch);
f = fopen(glb.input_file, "w");
if (!f) {
LOGGER_log("%s:%d:ERROR: Cannot open '%s' for writing as a temporary file for alterMIME (%s)", FL, scratch, strerror(errno));
exit(1);
} else {
do {
rc = fread(scratch, 1, sizeof(scratch), stdin);
if (rc == -1) {
LOGGER_log("%s:%d:ERROR: Cannot read from '%s' (%s)", FL, glb.input_file, strerror(errno));
exit(1);
}
if (rc) {
rc = fwrite(scratch, 1, rc, f);
if (rc == -1) {
LOGGER_log("%s:%d:ERROR: Cannot write to '%s' (%s)", FL, glb.input_file, strerror(errno));
exit(1);
}
}
} while (rc);
fclose(f);
}
}
if ((glb.alter_mode != AM_HEADER_ADJUST_MODE_NONE)&&(glb.alter_with != NULL)&&(glb.alter_header != NULL))
{
AM_alter_header( glb.input_file, glb.alter_header, glb.alter_with, glb.alter_mode );
}
if ((glb.replace)&&(glb.with)) AM_attachment_replace( glb.input_file, glb.replace, glb.with);
#ifdef ALTERMIME_PRETEXT
AM_set_pretext(0);
#endif
if (glb.disclaimer_file) AM_add_disclaimer( glb.input_file );
if (glb.remove_filename) AM_nullify_attachment(glb.input_file, glb.remove_filename);
if (glb.xheader) AM_insert_Xheader( glb.input_file, glb.xheader);
AM_done();
#ifdef ALTERMIME_PRETEXT
if (glb.pretext_insert) {
// LOGGER_log("%s:%d:alterMIME: PRETEXT STAGE",FL);
// LOGGER_log("%s:%d:alterMIME: PRETEXT STAGE",FL);
// LOGGER_log("%s:%d:alterMIME: PRETEXT STAGE",FL);
// LOGGER_log("%s:%d:alterMIME: PRETEXT STAGE",FL);
AM_init();
// AM_set_debug(1);
AM_set_pretext(1);
if (glb.pretext_file) AM_set_disclaimer_plain( glb.pretext_file, AM_DISCLAIMER_TYPE_FILENAME );
if (glb.pretext_html_file) {
AM_set_disclaimer_HTML( glb.pretext_html_file, AM_DISCLAIMER_TYPE_FILENAME );
AM_set_HTMLtoo(1);
}
if (glb.pretext_b64_file) AM_set_disclaimer_b64( glb.pretext_b64_file, AM_DISCLAIMER_TYPE_FILENAME );
AM_add_disclaimer( glb.input_file );
}
#endif
if (glb.input_is_stdin) {
char scratch[1024];
size_t rc;
FILE *f;
f = fopen(glb.input_file, "r");
if (!f) {
LOGGER_log("%s:%d:ERROR: Cannot open alterMIME temporary file '%s' for reading (%s)", FL, scratch, strerror(errno));
exit(1);
}
do {
rc = fread(scratch, 1, sizeof(scratch), f);
if (rc == -1) {
LOGGER_log("%s:%d:ERROR: Cannot read from '%s' (%s)", FL, glb.input_file, strerror(errno));
exit(1);
}
if (rc) {
rc = fwrite(scratch, 1, rc, stdout);
if (rc == -1) {
LOGGER_log("%s:%d:ERROR: Cannot write to '%s' (%s)", FL, glb.input_file, strerror(errno));
exit(1);
}
}
} while (rc);
fclose(f);
unlink(glb.input_file);
}
return 0;
}
/*-------------------------------------------------END. */