1/* $NetBSD: split_addr.c,v 1.3 2020/03/18 19:05:16 christos Exp $ */ 2 3/*++ 4/* NAME 5/* split_addr 3 6/* SUMMARY 7/* recipient localpart address splitter 8/* SYNOPSIS 9/* #include <split_addr.h> 10/* 11/* char *split_addr_internal(localpart, delimiter_set) 12/* char *localpart; 13/* const char *delimiter_set; 14/* LEGACY SUPPORT 15/* char *split_addr(localpart, delimiter_set) 16/* char *localpart; 17/* const char *delimiter_set; 18/* DESCRIPTION 19/* split_addr*() null-terminates \fIlocalpart\fR at the first 20/* occurrence of the \fIdelimiter\fR character(s) found, and 21/* returns a pointer to the remainder. 22/* 23/* With split_addr_internal(), the address must be in internal 24/* (unquoted) form. 25/* 26/* split_addr() is a backwards-compatible form for legacy code. 27/* 28/* Reserved addresses are not split: postmaster, mailer-daemon, 29/* double-bounce. Addresses that begin with owner-, or addresses 30/* that end in -request are not split when the owner_request_special 31/* parameter is set. 32/* LICENSE 33/* .ad 34/* .fi 35/* The Secure Mailer license must be distributed with this software. 36/* AUTHOR(S) 37/* Wietse Venema 38/* IBM T.J. Watson Research 39/* P.O. Box 704 40/* Yorktown Heights, NY 10598, USA 41/* 42/* Wietse Venema 43/* Google, Inc. 44/* 111 8th Avenue 45/* New York, NY 10011, USA 46/*--*/ 47 48/* System library. */ 49 50#include <sys_defs.h> 51#include <string.h> 52 53#ifdef STRCASECMP_IN_STRINGS_H 54#include <strings.h> 55#endif 56 57/* Utility library. */ 58 59#include <split_at.h> 60#include <stringops.h> 61 62/* Global library. */ 63 64#include <mail_params.h> 65#include <mail_addr.h> 66#include <split_addr.h> 67 68/* split_addr_internal - split address with extreme prejudice */ 69 70char *split_addr_internal(char *localpart, const char *delimiter_set) 71{ 72 ssize_t len; 73 74 /* 75 * Don't split these, regardless of what the delimiter is. 76 */ 77 if (strcasecmp(localpart, MAIL_ADDR_POSTMASTER) == 0) 78 return (0); 79 if (strcasecmp(localpart, MAIL_ADDR_MAIL_DAEMON) == 0) 80 return (0); 81 if (strcasecmp_utf8(localpart, var_double_bounce_sender) == 0) 82 return (0); 83 84 /* 85 * Backwards compatibility: don't split owner-foo or foo-request. 86 */ 87 if (strchr(delimiter_set, '-') != 0 && var_ownreq_special != 0) { 88 if (strncasecmp(localpart, "owner-", 6) == 0) 89 return (0); 90 if ((len = strlen(localpart) - 8) > 0 91 && strcasecmp(localpart + len, "-request") == 0) 92 return (0); 93 } 94 95 /* 96 * Safe to split this address. Do not split the address if the result 97 * would have a null localpart. 98 */ 99 if ((len = strcspn(localpart, delimiter_set)) == 0 || localpart[len] == 0) { 100 return (0); 101 } else { 102 localpart[len] = 0; 103 return (localpart + len + 1); 104 } 105} 106