123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
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/*++
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/* NAME
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/* header_opts 3
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/* SUMMARY
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/* message header classification
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/* SYNOPSIS
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/* #include <header_opts.h>
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/*
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/* HEADER_OPTS *header_opts_find(string)
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/* const char *string;
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/* DESCRIPTION
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/* header_opts_find() takes a message header line and looks up control
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/* information for the corresponding header type.
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/* DIAGNOSTICS
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/* Panic: input is not a valid header line. The result is a pointer
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/* to HEADER_OPTS in case of success, a null pointer when the header
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/* label was not recognized.
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/* SEE ALSO
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/* header_opts(3h) the gory details
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/* LICENSE
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/* .ad
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/* .fi
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/* The Secure Mailer license must be distributed with this software.
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/* AUTHOR(S)
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/* Wietse Venema
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/* IBM T.J. Watson Research
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/* P.O. Box 704
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/* Yorktown Heights, NY 10598, USA
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/*--*/
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/* System library. */
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#include <sys_defs.h>
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#include <ctype.h>
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/* Utility library. */
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#include <msg.h>
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#include <htable.h>
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#include <vstring.h>
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/* Global library. */
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#include "header_opts.h"
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/*
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* Header names are given in the preferred capitalization. The lookups are
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* case-insensitive.
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*/
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static HEADER_OPTS header_opts[] = {
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"Apparently-To", HDR_APPARENTLY_TO, HDR_OPT_RECIP,
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"Bcc", HDR_BCC, HDR_OPT_DROP | HDR_OPT_XRECIP,
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"Cc", HDR_CC, HDR_OPT_XRECIP,
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"Delivered-To", HDR_DELIVERED_TO, 0,
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"Date", HDR_DATE, 0,
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"Errors-To", HDR_ERRORS_TO, HDR_OPT_RECIP,
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"From", HDR_FROM, HDR_OPT_SENDER,
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"Message-Id", HDR_MESSAGE_ID, 0,
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"Received", HDR_RECEIVED, 0,
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"Reply-To", HDR_REPLY_TO, HDR_OPT_RECIP,
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"Resent-Bcc", HDR_RESENT_BCC, HDR_OPT_DROP | HDR_OPT_XRECIP | HDR_OPT_RR,
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"Resent-Cc", HDR_RESENT_CC, HDR_OPT_XRECIP | HDR_OPT_RR,
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"Resent-Date", HDR_RESENT_DATE, HDR_OPT_RR,
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"Resent-From", HDR_RESENT_FROM, HDR_OPT_SENDER | HDR_OPT_RR,
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"Resent-Message-Id", HDR_RESENT_MESSAGE_ID, HDR_OPT_RR,
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"Resent-Reply-To", HDR_RESENT_REPLY_TO, HDR_OPT_RECIP | HDR_OPT_RR,
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"Resent-Sender", HDR_RESENT_SENDER, HDR_OPT_SENDER | HDR_OPT_RR,
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"Resent-To", HDR_RESENT_TO, HDR_OPT_XRECIP | HDR_OPT_RR,
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"Return-Path", HDR_RETURN_PATH, HDR_OPT_DROP | HDR_OPT_SENDER,
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"Return-Receipt-To", HDR_RETURN_RECEIPT_TO, HDR_OPT_RECIP,
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"Sender", HDR_SENDER, HDR_OPT_SENDER,
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"To", HDR_TO, HDR_OPT_XRECIP,
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};
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#define HEADER_OPTS_SIZE (sizeof(header_opts) / sizeof(header_opts[0]))
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static HTABLE *header_hash; /* quick lookup */
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static VSTRING *header_key;
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/* header_opts_init - initialize */
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static void header_opts_init(void)
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{
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HEADER_OPTS *hp;
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const char *cp;
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/*
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* Build a hash table for quick lookup, and allocate memory for
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* lower-casing the lookup key.
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*/
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header_key = vstring_alloc(10);
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header_hash = htable_create(HEADER_OPTS_SIZE);
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for (hp = header_opts; hp < header_opts + HEADER_OPTS_SIZE; hp++) {
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VSTRING_RESET(header_key);
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for (cp = hp->name; *cp; cp++)
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VSTRING_ADDCH(header_key, TOLOWER(*cp));
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VSTRING_TERMINATE(header_key);
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htable_enter(header_hash, vstring_str(header_key), (char *) hp);
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}
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}
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/* header_opts_find - look up header options */
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HEADER_OPTS *header_opts_find(const char *string)
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{
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const char *cp;
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if (header_hash == 0)
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header_opts_init();
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/*
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* Look up the lower-cased version of the header name.
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*/
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VSTRING_RESET(header_key);
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for (cp = string; *cp != ':'; cp++) {
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if (*cp == 0)
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msg_panic("header_opts_find: no colon in header: %.30s", string);
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VSTRING_ADDCH(header_key, TOLOWER(*cp));
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}
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VSTRING_TERMINATE(header_key);
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return ((HEADER_OPTS *) htable_find(header_hash, vstring_str(header_key)));
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}
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