dma.h

   1 /*
   2  * Copyright (c) 2008-2014, Simon Schubert <2@0x2c.org>.
   3  * Copyright (c) 2008 The DragonFly Project.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to The DragonFly Project
   6  * by Simon Schubert <2@0x2c.org> and
   7  * Matthias Schmidt <matthias@dragonflybsd.org>.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  * 3. Neither the name of The DragonFly Project nor the names of its
  20  *    contributors may be used to endorse or promote products derived
  21  *    from this software without specific, prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  24  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  25  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  26  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE
  27  * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  28  * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
  29  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  30  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  31  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
  32  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
  33  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #ifndef DMA_H
  38 #define DMA_H
  39
  40 #include <sys/types.h>
  41 #include <sys/queue.h>
  42 #include <sys/socket.h>
  43 #include <arpa/nameser.h>
  44 #include <arpa/inet.h>
  45 #include <openssl/ssl.h>
  46 #include <netdb.h>
  47 #include <sysexits.h>
  48
  49 #define VERSION "DragonFly Mail Agent " DMA_VERSION
  50
  51 #define BUF_SIZE        2048
  52 #define ERRMSG_SIZE     1024
  53 #define USERNAME_SIZE   50
  54 #define EHLO_RESPONSE_SIZE BUF_SIZE
  55 #define MIN_RETRY       300             /* 5 minutes */
  56 #define MAX_RETRY       (3*60*60)       /* retry at least every 3 hours */
  57 #define MAX_TIMEOUT     (5*24*60*60)    /* give up after 5 days */
  58 #define SLEEP_TIMEOUT   30              /* check for queue flush every 30 seconds */
  59 #ifndef PATH_MAX
  60 #define PATH_MAX        1024            /* Max path len */
  61 #endif
  62 #define SMTP_PORT       25              /* Default SMTP port */
  63 #define CON_TIMEOUT     (5*60)          /* Connection timeout per RFC5321 */
  64
  65 #define STARTTLS        0x002           /* StartTLS support */
  66 #define SECURETRANS     0x004           /* SSL/TLS in general */
  67 #define NOSSL           0x008           /* Do not use SSL */
  68 #define DEFER           0x010           /* Defer mails */
  69 #define INSECURE        0x020           /* Allow plain login w/o encryption */
  70 #define FULLBOUNCE      0x040           /* Bounce the full message */
  71 #define TLS_OPP         0x080           /* Opportunistic STARTTLS */
  72 #define NULLCLIENT      0x100           /* Nullclient support */
  73
  74 #ifndef CONF_PATH
  75 #error Please define CONF_PATH
  76 #endif
  77
  78 #ifndef LIBEXEC_PATH
  79 #error Please define LIBEXEC_PATH
  80 #endif
  81
  82 #define SPOOL_FLUSHFILE "flush"
  83
  84 #ifndef DMA_ROOT_USER
  85 #define DMA_ROOT_USER   "mail"
  86 #endif
  87 #ifndef DMA_GROUP
  88 #define DMA_GROUP       "mail"
  89 #endif
  90
  91 #ifndef MBOX_STRICT
  92 #define MBOX_STRICT     0
  93 #endif
  94
  95
  96 struct stritem {
  97         SLIST_ENTRY(stritem) next;
  98         char *str;
  99 };
 100 SLIST_HEAD(strlist, stritem);
 101
 102 struct alias {
 103         LIST_ENTRY(alias) next;
 104         char *alias;
 105         struct strlist dests;
 106 };
 107 LIST_HEAD(aliases, alias);
 108
 109 struct qitem {
 110         LIST_ENTRY(qitem) next;
 111         const char *sender;
 112         char *addr;
 113         char *queuefn;
 114         char *mailfn;
 115         char *queueid;
 116         FILE *queuef;
 117         FILE *mailf;
 118         int remote;
 119 };
 120 LIST_HEAD(queueh, qitem);
 121
 122 struct queue {
 123         struct queueh queue;
 124         char *id;
 125         FILE *mailf;
 126         char *tmpf;
 127         const char *sender;
 128 };
 129
 130 struct config {
 131         const char *smarthost;
 132         int port;
 133         const char *aliases;
 134         const char *spooldir;
 135         const char *authpath;
 136         const char *certfile;
 137         int features;
 138         const char *mailname;
 139         const char *masquerade_host;
 140         const char *masquerade_user;
 141
 142         /* XXX does not belong into config */
 143         SSL *ssl;
 144 };
 145
 146
 147 struct authuser {
 148         SLIST_ENTRY(authuser) next;
 149         char *login;
 150         char *password;
 151         char *host;
 152 };
 153 SLIST_HEAD(authusers, authuser);
 154
 155
 156 struct mx_hostentry {
 157         char            host[MAXDNAME];
 158         char            addr[INET6_ADDRSTRLEN];
 159         int             pref;
 160         struct addrinfo ai;
 161         struct sockaddr_storage sa;
 162 };
 163
 164 struct smtp_auth_mechanisms {
 165         int cram_md5;
 166         int login;
 167 };
 168
 169 struct smtp_features {
 170         struct smtp_auth_mechanisms auth;
 171         int starttls;
 172 };
 173
 174 /* global variables */
 175 extern struct aliases aliases;
 176 extern struct config config;
 177 extern struct strlist tmpfs;
 178 extern struct authusers authusers;
 179 extern char username[USERNAME_SIZE];
 180 extern uid_t useruid;
 181 extern const char *logident_base;
 182
 183 extern char neterr[ERRMSG_SIZE];
 184 extern char errmsg[ERRMSG_SIZE];
 185
 186 /* aliases_parse.y */
 187 int yyparse(void);
 188 int yywrap(void);
 189 int yylex(void);
 190 extern FILE *yyin;
 191
 192 /* conf.c */
 193 void trim_line(char *);
 194 void parse_conf(const char *);
 195 void parse_authfile(const char *);
 196
 197 /* crypto.c */
 198 void hmac_md5(unsigned char *, int, unsigned char *, int, unsigned char *);
 199 int smtp_auth_md5(int, char *, char *);
 200 int smtp_init_crypto(int, int, struct smtp_features*);
 201
 202 /* dns.c */
 203 int dns_get_mx_list(const char *, int, struct mx_hostentry **, int);
 204
 205 /* net.c */
 206 char *ssl_errstr(void);
 207 int read_remote(int, int, char *);
 208 ssize_t send_remote_command(int, const char*, ...)  __attribute__((__nonnull__(2), __format__ (__printf__, 2, 3)));
 209 int perform_server_greeting(int, struct smtp_features*);
 210 int deliver_remote(struct qitem *);
 211
 212 /* base64.c */
 213 int base64_encode(const void *, int, char **);
 214 int base64_decode(const char *, void *);
 215
 216 /* dma.c */
 217 #define EXPAND_ADDR     1
 218 #define EXPAND_WILDCARD 2
 219 int add_recp(struct queue *, const char *, int);
 220 void run_queue(struct queue *);
 221
 222 /* spool.c */
 223 int newspoolf(struct queue *);
 224 int linkspool(struct queue *);
 225 int load_queue(struct queue *);
 226 void delqueue(struct qitem *);
 227 int acquirespool(struct qitem *);
 228 void dropspool(struct queue *, struct qitem *);
 229 int flushqueue_since(unsigned int);
 230 int flushqueue_signal(void);
 231
 232 /* local.c */
 233 int deliver_local(struct qitem *);
 234
 235 /* mail.c */
 236 void bounce(struct qitem *, const char *);
 237 int readmail(struct queue *, int, int);
 238
 239 /* util.c */
 240 const char *hostname(void);
 241 void setlogident(const char *, ...) __attribute__((__format__ (__printf__, 1, 2)));
 242 void errlog(int, const char *, ...) __attribute__((__format__ (__printf__, 2, 3)));
 243 void errlogx(int, const char *, ...) __attribute__((__format__ (__printf__, 2, 3)));
 244 void set_username(void);
 245 void deltmp(void);
 246 int do_timeout(int, int);
 247 int open_locked(const char *, int, ...);
 248 char *rfc822date(void);
 249 int strprefixcmp(const char *, const char *);
 250 void init_random(void);
 251
 252 #endif