mdw@git.distorted.org.uk Git - secnet/blob - comm-common.h

   1 /*
   2  * This file is part of secnet.
   3  * See README for full list of copyright holders.
   4  *
   5  * secnet is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version d of the License, or
   8  * (at your option) any later version.
   9  *
  10  * secnet is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * version 3 along with secnet; if not, see
  17  * https://www.gnu.org/licenses/gpl.html.
  18  */
  19
  20 #ifndef COMM_COMMON_H
  21 #define COMM_COMMON_H
  22
  23 #include "secnet.h"
  24 #include "util.h"
  25
  26 /*----- for all comms -----*/
  27
  28 struct comm_notify_entry {
  29     comm_notify_fn *fn;
  30     void *state;
  31     LIST_ENTRY(comm_notify_entry) entry;
  32 };
  33 LIST_HEAD(comm_notify_list, comm_notify_entry) notify;
  34
  35 struct commcommon { /* must be first so that void* is comm_common* */
  36     closure_t cl;
  37     struct comm_if ops;
  38     struct cloc loc;
  39     struct comm_notify_list notify;
  40     struct buffer_if *rbuf;
  41 };
  42
  43 void comm_request_notify(void *commst, void *nst, comm_notify_fn *fn);
  44 void comm_release_notify(void *commst, void *nst, comm_notify_fn *fn);
  45
  46 bool_t comm_notify(struct comm_notify_list *notify, struct buffer_if *buf,
  47                    const struct comm_addr *ca);
  48   /* Either: returns True, with message delivered and buffer freed.
  49    * Or: False, if no-one wanted it - buffer still allocd'd.
  50    * Ie, like comm_notify_fn. */
  51
  52 void comm_apply(struct commcommon *cc, void *st);
  53
  54 #define COMM_APPLY(st,cc,prefix,desc,loc)               \
  55     NEW(st);                                            \
  56     (cc)->loc=loc;                                      \
  57     (cc)->cl.description=desc;                          \
  58     (cc)->ops.sendmsg=prefix##sendmsg;                  \
  59     (cc)->ops.addr_to_string=prefix##addr_to_string;    \
  60     comm_apply((cc),(st))
  61    /* void COMM_APPLY(SOMETHING *st, struct commcommon *FUNCTIONOF(st),
  62     *                 prefix, "DESC", struct cloc loc);
  63     *   // Expects in scope: prefix##sendmsg, prefix##addr_to_string.
  64     */
  65
  66 #define COMM_APPLY_STANDARD(st,cc,desc,args)                            \
  67     item_t *item=list_elem(args,0);                                     \
  68     if (!item || item->type!=t_dict) {                                  \
  69         cfgfatal((cc)->loc,desc,"first argument must be a dictionary\n"); \
  70     }                                                                   \
  71     dict_t *d=item->data.dict;                                          \
  72     (cc)->rbuf=find_cl_if(d,"buffer",CL_BUFFER,True,desc,(cc)->loc)
  73     /* void COMM_APPLY_STANDARD(SOMETHING *st, struct commcommon *cc,
  74      *                          const char *desc, list_t *args);
  75      *   // Declares:
  76      *   //    item_t *item = <undefined>;
  77      *   //    dict_t *dict = <construction dictionary argument>;
  78      */
  79
  80 /*----- for udp-based comms -----*/
  81
  82 #define UDP_MAX_SOCKETS 3 /* 2 ought to do really */
  83
  84 #define MAX_AF MAX_RAW(AF_INET6,AF_INET)
  85
  86 struct udpsock {
  87     union iaddr addr;
  88     int fd;
  89     bool_t experienced[/*0=recv,1=send*/2][MAX_AF+1][/*success?*/2];
  90 };
  91
  92 struct udpsocks {
  93     int n_socks;
  94     struct udpsock socks[UDP_MAX_SOCKETS];
  95     /* private for udp_socks_* */
  96     struct udpcommon *uc; /* link to parent, for cfg, notify list, etc. */
  97     struct poll_interest *interest;
  98     const char *desc;
  99 };
 100
 101 struct udpcommon {
 102     struct commcommon cc;
 103     int port;
 104     string_t authbind;
 105     bool_t use_proxy;
 106     union iaddr proxy;
 107 };
 108
 109 bool_t udp_make_socket(struct udpcommon *uc, struct udpsock *us,
 110                        int failmsgclass);
 111   /* Caller should have filled in ->addr.  Fills in us->fd,
 112      ->experienced; updates ->addr.  Logs any errors with lg_[v]perror. */
 113 bool_t udp_import_socket(struct udpcommon *uc, struct udpsock *us,
 114                          int failmsgclass, int fd);
 115   /* Like udp_make_socket, but caller provides fd.  fd is not closed
 116      on error */
 117
 118 void udp_destroy_socket(struct udpcommon *uc, struct udpsock *us);
 119   /* Idempotent.  No errors are possible. */
 120
 121 const char *af_name(int af);
 122 void udp_sock_experienced(struct log_if *lg, struct udpcommon *uc,
 123                           struct udpsocks *socks, struct udpsock *us,
 124                           const union iaddr *dest, int af /* 0 means any */,
 125                           int r, int errnoval);
 126
 127 void udp_socks_register(struct udpcommon *uc, struct udpsocks *socks,
 128                         const char *desc);
 129 void udp_socks_deregister(struct udpcommon *uc, struct udpsocks *socks);
 130 void udp_socks_childpersist(struct udpcommon *uc, struct udpsocks *socks);
 131
 132 #define UDP_APPLY_STANDARD(st,uc,desc)                                  \
 133     (uc)->use_proxy=False;                                              \
 134     (uc)->authbind=dict_read_string(d,"authbind",False,"udp",(uc)->cc.loc); \
 135     (uc)->port=dict_read_number(d,"port",False,"udp",(uc)->cc.loc,0)
 136     /* void UDP_APPLY_STANDARD(SOMETHING *st, struct udpcommon *uc,
 137      *                         const char *desc);
 138      *   // Expects in scope:  dict_t *d=...;   as from COMM_APPLY_STANDARD
 139      */
 140
 141 #endif /*COMM_COMMON_H*/