diff options
Diffstat (limited to 'src/global/header_opts.c')
| -rw-r--r-- | src/global/header_opts.c | 179 |
1 files changed, 179 insertions, 0 deletions
diff --git a/src/global/header_opts.c b/src/global/header_opts.c new file mode 100644 index 0000000..c0c4d5c --- /dev/null +++ b/src/global/header_opts.c @@ -0,0 +1,179 @@ +/*++ +/* NAME +/* header_opts 3 +/* SUMMARY +/* message header classification +/* SYNOPSIS +/* #include <header_opts.h> +/* +/* const HEADER_OPTS *header_opts_find(string) +/* const char *string; +/* DESCRIPTION +/* header_opts_find() takes a message header line and looks up control +/* information for the corresponding header type. +/* DIAGNOSTICS +/* Panic: input is not a valid header line. The result is a pointer +/* to HEADER_OPTS in case of success, a null pointer when the header +/* label was not recognized. +/* SEE ALSO +/* header_opts(3h) the gory details +/* LICENSE +/* .ad +/* .fi +/* The Secure Mailer license must be distributed with this software. +/* AUTHOR(S) +/* Wietse Venema +/* IBM T.J. Watson Research +/* P.O. Box 704 +/* Yorktown Heights, NY 10598, USA +/*--*/ + +/* System library. */ + +#include <sys_defs.h> +#include <ctype.h> + +/* Utility library. */ + +#include <msg.h> +#include <htable.h> +#include <vstring.h> +#include <stringops.h> +#include <argv.h> +#include <mymalloc.h> + +/* Global library. */ + +#include <mail_params.h> +#include <header_opts.h> + + /* + * Header names are given in the preferred capitalization. The lookups are + * case-insensitive. + * + * XXX Removing Return-Path: headers should probably be done only with mail + * that enters via a non-SMTP channel. Changing this now could break other + * software. See also comments in bounce_notify_util.c. + */ +static HEADER_OPTS header_opts[] = { + "Apparently-To", HDR_APPARENTLY_TO, HDR_OPT_RECIP, + "Bcc", HDR_BCC, HDR_OPT_XRECIP, + "Cc", HDR_CC, HDR_OPT_XRECIP, + "Content-Description", HDR_CONTENT_DESCRIPTION, HDR_OPT_MIME, + "Content-Disposition", HDR_CONTENT_DISPOSITION, HDR_OPT_MIME, + "Content-ID", HDR_CONTENT_ID, HDR_OPT_MIME, + "Content-Length", HDR_CONTENT_LENGTH, 0, + "Content-Transfer-Encoding", HDR_CONTENT_TRANSFER_ENCODING, HDR_OPT_MIME, + "Content-Type", HDR_CONTENT_TYPE, HDR_OPT_MIME, + "Delivered-To", HDR_DELIVERED_TO, 0, + "Disposition-Notification-To", HDR_DISP_NOTIFICATION, HDR_OPT_SENDER, + "Date", HDR_DATE, 0, + "Errors-To", HDR_ERRORS_TO, HDR_OPT_SENDER, + "From", HDR_FROM, HDR_OPT_SENDER, + "Mail-Followup-To", HDR_MAIL_FOLLOWUP_TO, HDR_OPT_SENDER, + "Message-Id", HDR_MESSAGE_ID, 0, + "MIME-Version", HDR_MIME_VERSION, HDR_OPT_MIME, + "Received", HDR_RECEIVED, 0, + "Reply-To", HDR_REPLY_TO, HDR_OPT_SENDER, + "Resent-Bcc", HDR_RESENT_BCC, HDR_OPT_XRECIP | HDR_OPT_RR, + "Resent-Cc", HDR_RESENT_CC, HDR_OPT_XRECIP | HDR_OPT_RR, + "Resent-Date", HDR_RESENT_DATE, HDR_OPT_RR, + "Resent-From", HDR_RESENT_FROM, HDR_OPT_SENDER | HDR_OPT_RR, + "Resent-Message-Id", HDR_RESENT_MESSAGE_ID, HDR_OPT_RR, + "Resent-Reply-To", HDR_RESENT_REPLY_TO, HDR_OPT_RECIP | HDR_OPT_RR, + "Resent-Sender", HDR_RESENT_SENDER, HDR_OPT_SENDER | HDR_OPT_RR, + "Resent-To", HDR_RESENT_TO, HDR_OPT_XRECIP | HDR_OPT_RR, + "Return-Path", HDR_RETURN_PATH, HDR_OPT_SENDER, + "Return-Receipt-To", HDR_RETURN_RECEIPT_TO, HDR_OPT_SENDER, + "Sender", HDR_SENDER, HDR_OPT_SENDER, + "To", HDR_TO, HDR_OPT_XRECIP, +}; + +#define HEADER_OPTS_SIZE (sizeof(header_opts) / sizeof(header_opts[0])) + +static HTABLE *header_hash; /* quick lookup */ +static VSTRING *header_key; + +/* header_opts_init - initialize */ + +static void header_opts_init(void) +{ + const HEADER_OPTS *hp; + const char *cp; + + /* + * Build a hash table for quick lookup, and allocate memory for + * lower-casing the lookup key. + */ + header_key = vstring_alloc(10); + header_hash = htable_create(HEADER_OPTS_SIZE); + for (hp = header_opts; hp < header_opts + HEADER_OPTS_SIZE; hp++) { + VSTRING_RESET(header_key); + for (cp = hp->name; *cp; cp++) + VSTRING_ADDCH(header_key, TOLOWER(*cp)); + VSTRING_TERMINATE(header_key); + htable_enter(header_hash, vstring_str(header_key), (void *) hp); + } +} + +/* header_drop_init - initialize "header drop" flags */ + +static void header_drop_init(void) +{ + ARGV *hdr_drop_list; + char **cpp; + HTABLE_INFO *ht; + HEADER_OPTS *hp; + + /* + * Having one main.cf parameter for the "drop" header flag does not + * generalize to the "sender", "extract", etc., flags. Flags would need + * to be grouped by header name, but that would be unwieldy, too: + * + * message_header_flags = { apparently-to = recipient }, { bcc = recipient, + * extract, drop }, { from = sender }, ... + * + * Thus, it is unlikely that all header flags will become configurable. + */ + hdr_drop_list = argv_split(var_drop_hdrs, CHARS_COMMA_SP); + for (cpp = hdr_drop_list->argv; *cpp; cpp++) { + lowercase(*cpp); + if ((ht = htable_locate(header_hash, *cpp)) == 0) { + hp = (HEADER_OPTS *) mymalloc(sizeof(*hp)); + hp->type = HDR_OTHER; + hp->flags = HDR_OPT_DROP; + ht = htable_enter(header_hash, *cpp, (void *) hp); + hp->name = ht->key; + } else + hp = (HEADER_OPTS *) ht->value; + hp->flags |= HDR_OPT_DROP; + } + argv_free(hdr_drop_list); +} + +/* header_opts_find - look up header options */ + +const HEADER_OPTS *header_opts_find(const char *string) +{ + const char *cp; + + if (header_hash == 0) { + header_opts_init(); + header_drop_init(); + } + + /* + * Look up the lower-cased version of the header name. + */ + VSTRING_RESET(header_key); + for (cp = string; *cp != ':'; cp++) { + if (*cp == 0) + msg_panic("header_opts_find: no colon in header: %.30s", string); + VSTRING_ADDCH(header_key, TOLOWER(*cp)); + } + vstring_truncate(header_key, + trimblanks(vstring_str(header_key), cp - string) + - vstring_str(header_key)); + VSTRING_TERMINATE(header_key); + return ((const HEADER_OPTS *) htable_find(header_hash, vstring_str(header_key))); +} |