mdw@git.distorted.org.uk Git - adns/blob - src/internal.h

   1 /**/
   2
   3 #ifndef ADNS_INTERNAL_H_INCLUDED
   4 #define ADNS_INTERNAL_H_INCLUDED
   5
   6 #include <sys/time.h>
   7
   8 #include "adns.h"
   9
  10 /* Configuration and constants */
  11
  12 #define MAXSERVERS 5
  13 #define MAXUDPRETRIES 15
  14 #define UDPRETRYMS 2000
  15 #define TCPMS 30000
  16 #define LOCALRESOURCEMS 20
  17 #define UDPMAXDGRAM 512
  18 #define NSPORT 53
  19
  20 /* Shared data structures */
  21
  22 union adns__align {
  23   adns_status status;
  24   char *cp;
  25   adns_rrtype type;
  26   int int;
  27   struct in_addr ia;
  28   unsigned long ul;
  29 };
  30
  31 struct adns__query {
  32   /* FIXME: make sure this is all init'd properly */
  33   enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
  34   adns_query back, next;
  35   adns_query parent;
  36   struct { adns_query head, tail; } children;
  37   struct { adns_query back, next; } siblings;
  38   adns_rrtype type;
  39   adns_answer *answer;
  40   size_t ansalloc; ansused;
  41   int id, flags, udpretries;
  42   int nextudpserver;
  43   unsigned long sentudp, failedtcp; /* bitmap indexed by server */
  44   struct timeval timeout;
  45   void *context;
  46   unsigned char *querymsg;
  47   int querylen;
  48   char owner[1];
  49   /* After the owner name and nul comes the query message */
  50
  51   /* Possible states:
  52    *
  53    *  state   Queue   child  id   answer    nextudpserver  sentudp     failedtcp
  54    *
  55    *  udp     NONE    null   >=0  null      0              zero        zero
  56    *  udp     timew   null   >=0  null      any            nonzero     zero
  57    *  udp     NONE    null   >=0  null      any            nonzero     zero
  58    *
  59    *  tcpwait timew   null   >=0  null      irrelevant     zero        any
  60    *  tcpsent timew   null   >=0  null      irrelevant     zero        any
  61    *
  62    *  child   childw  set    >=0  partial   irrelevant     irrelevant  irrelevant
  63    *  done    output  null   -1   set/null  irrelevant     irrelevant  irrelevant
  64    *
  65    *                          +------------------------+
  66    *             START -----> |      udp/NONE          |
  67    *                          +------------------------+
  68    *                         /                       |\  \
  69    *        too big for UDP /             UDP timeout  \  \ send via UDP
  70    *        do this ASAP!  /              more retries  \  \   do this ASAP!
  71    *                     |_                  desired     \  _|
  72    *              +---------------+                     +-----------+
  73    *              | tcpwait/timew | ____                | udp/timew |
  74    *              +---------------+     \               +-----------+
  75    *                    |  ^             |                 | |
  76    *     TCP conn'd;    |  | TCP died    |                 | |
  77    *     send via TCP   |  | more        |     UDP timeout | |
  78    *     do this ASAP!  |  | servers     |      no more    | |
  79    *                    v  | to try      |      retries    | |
  80    *              +---------------+      |      desired    | |
  81    *              | tcpsent/timew | ____ |                 | |
  82    *              +---------------+     \|                 | |
  83    *                  \   \ TCP died     | TCP             | |
  84    *                   \   \ no more     | timeout         / |
  85    *                    \   \ servers    |                /  |
  86    *                     \   \ to try    |               /   |
  87    *                  got \   \          v             |_    / got
  88    *                 reply \   _| +------------------+      / reply
  89    *                        \     | done/output FAIL |     /
  90    *                         \    +------------------+    /
  91    *                          \                          /
  92    *                           _|                      |_
  93    *                             (..... got reply ....)
  94    *                              /                   \
  95    *        need child query/ies /                     \ no child query
  96    *                            /                       \
  97    *                          |_                         _|
  98    *                +--------------+                   +----------------+
  99    *                | child/childw | ----------------> | done/output OK |
 100    *                +--------------+  children done    +----------------+
 101    */
 102 };
 103
 104 typedef struct {
 105   size_t used, avail;
 106   unsigned char *buf;
 107 } adns__vbuf;
 108
 109 struct adns__state {
 110   /* FIXME: make sure this is all init'd properly */
 111   adns_initflags iflags;
 112   FILE *diagfile;
 113   struct { adns_query head, tail; } timew, childw, output;
 114   int nextid, udpsocket;
 115   adns_vbuf rqbuf, tcpsend, tcprecv;
 116   int nservers, tcpserver;
 117   enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
 118   int tcpsocket;
 119   struct timeval tcptimeout;
 120   struct server {
 121     struct in_addr addr;
 122   } servers[MAXSERVERS];
 123 };
 124
 125 /* From setup.c: */
 126
 127 void adns__vdiag(adns_state ads, adns_initflags prevent, const char *pfx,
 128                  int serv, const char *fmt, va_list al);
 129 void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
 130 void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
 131 void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
 132
 133 static inline int adns__vbuf_ensure(adns__vbuf *vb, size_t want);
 134 int adns__vbuf_append(adns__vbuf *vb, const byte *data, size_t len);
 135 int adns__vbuf_appendq(adns__vbuf *vb, const byte *data, size_t len);
 136 /* 1=>success, 0=>realloc failed */
 137
 138 /* From submit.c: */
 139
 140 void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
 141
 142 /* From query.c: */
 143
 144 void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
 145 void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
 146 adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
 147                           adns_rrtype type, adns_queryflags flags, int *qml_r);
 148
 149 /* From event.c: */
 150 void adns__tcp_broken(adns_state ads, const char *what, const char *why);
 151 void adns__tcp_tryconnect(adns_state ads);
 152
 153 /* Useful static inline functions: */
 154
 155 static inline void timevaladd(struct timeval *tv_io, long ms) {
 156   struct timeval tmp;
 157   assert(ms>=0);
 158   tmp= *tv_io;
 159   tmp.tv_usec += (ms%1000)*1000;
 160   tmp.tv_sec += ms/1000;
 161   if (tmp.tv_usec >= 1000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
 162   *tv_io= tmp;
 163 }
 164
 165 static inline int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
 166 static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
 167
 168 /* Useful macros */
 169
 170 #define LIST_UNLINK_PART(list,node,part) \
 171   do { \
 172     if ((node)->back) (node)->back->part next= (node)->part next; \
 173       else                        (list).head= (node)->part next; \
 174     if ((node)->next) (node)->next->part back= (node)->part back; \
 175       else                        (list).tail= (node)->part back; \
 176   } while(0)
 177
 178 #define LIST_LINK_TAIL_PART(list,node,part) \
 179   do { \
 180     (node)->part back= 0; \
 181     (node)->part next= (list).tail; \
 182     if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
 183     (list).tail= (node); \
 184   } while(0)
 185
 186 #define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
 187 #define LIST_LINK_TAIL_PART(list,node) LIST_LINK_TAIL(list,node,)
 188
 189 #endif