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 #define PRINTFFORMAT(a,b) __attribute__((format(printf,a,b)))
   7 typedef unsigned char byte;
   8
   9 #include <stdarg.h>
  10 #include <assert.h>
  11 #include <unistd.h>
  12
  13 #include <sys/time.h>
  14
  15 #include "adns.h"
  16
  17 typedef enum {
  18   rtf_deref=     0x1, /* dereference domains and perhaps produce extra data */
  19   rtf_mail822=   0x2, /* make mailboxes be in RFC822 rcpt field format */
  20 } rrtype_flags;
  21
  22 struct adns__rrtype {
  23   int qtype;
  24   rrtype_flags rflags;
  25   void (*recv_fn)(void);
  26 };
  27
  28 /* Configuration and constants */
  29
  30 #define MAXSERVERS 5
  31 #define MAXUDPRETRIES /*15*/5
  32 #define UDPRETRYMS 2000
  33 #define TCPMS 30000
  34 #define LOCALRESOURCEMS 20
  35 #define MAXUDPDGRAM 512
  36 #define NSPORT 53
  37 #define MAXDNAME 255
  38
  39 /* Shared data structures */
  40
  41 typedef union {
  42   adns_status status;
  43   char *cp;
  44   adns_rrtype type;
  45   int i;
  46   struct in_addr ia;
  47   unsigned long ul;
  48 } rr_align;
  49
  50 typedef struct {
  51   int used, avail;
  52   byte *buf;
  53 } vbuf;
  54
  55 typedef union {
  56   void *ext;
  57   int dmaddr_index;
  58 } qcontext;
  59
  60 struct adns__query {
  61   /* FIXME: make sure this is all init'd properly */
  62   enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
  63   adns_query back, next, parent;
  64   struct { adns_query head, tail; } children;
  65   struct { adns_query back, next; } siblings;
  66   adns_rrtype type;
  67   vbuf answer;
  68   int id, flags, udpretries;
  69   int udpnextserver;
  70   unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
  71   struct timeval timeout;
  72   byte *querymsg;
  73   int querylen;
  74   qcontext context;
  75   char owner[1];
  76   /* After the owner name and nul comes the query message, pointed to by querymsg */
  77
  78   /* Possible states:
  79    *
  80    *  state   Queue   child  id   answer    nextudpserver  sentudp     failedtcp
  81    *
  82    *  udp     NONE    null   >=0  null      0              zero        zero
  83    *  udp     timew   null   >=0  null      any            nonzero     zero
  84    *  udp     NONE    null   >=0  null      any            nonzero     zero
  85    *
  86    *  tcpwait timew   null   >=0  null      irrelevant     zero        any
  87    *  tcpsent timew   null   >=0  null      irrelevant     zero        any
  88    *
  89    *  child   childw  set    >=0  partial   irrelevant     irrelevant  irrelevant
  90    *  done    output  null   -1   set/null  irrelevant     irrelevant  irrelevant
  91    *
  92    *                          +------------------------+
  93    *             START -----> |      udp/NONE          |
  94    *                          +------------------------+
  95    *                         /                       |\  \
  96    *        too big for UDP /             UDP timeout  \  \ send via UDP
  97    *        do this ASAP!  /              more retries  \  \   do this ASAP!
  98    *                     |_                  desired     \  _|
  99    *              +---------------+                     +-----------+
 100    *              | tcpwait/timew | ____                | udp/timew |
 101    *              +---------------+     \               +-----------+
 102    *                    |  ^             |                 | |
 103    *     TCP conn'd;    |  | TCP died    |                 | |
 104    *     send via TCP   |  | more        |     UDP timeout | |
 105    *     do this ASAP!  |  | servers     |      no more    | |
 106    *                    v  | to try      |      retries    | |
 107    *              +---------------+      |      desired    | |
 108    *              | tcpsent/timew | ____ |                 | |
 109    *              +---------------+     \|                 | |
 110    *                  \   \ TCP died     | TCP             | |
 111    *                   \   \ no more     | timeout         / |
 112    *                    \   \ servers    |                /  |
 113    *                     \   \ to try    |               /   |
 114    *                  got \   \          v             |_    / got
 115    *                 reply \   _| +------------------+      / reply
 116    *                        \     | done/output FAIL |     /
 117    *                         \    +------------------+    /
 118    *                          \                          /
 119    *                           _|                      |_
 120    *                             (..... got reply ....)
 121    *                              /                   \
 122    *        need child query/ies /                     \ no child query
 123    *                            /                       \
 124    *                          |_                         _|
 125    *                +--------------+                   +----------------+
 126    *                | child/childw | ----------------> | done/output OK |
 127    *                +--------------+  children done    +----------------+
 128    */
 129 };
 130
 131 struct adns__state {
 132   adns_initflags iflags;
 133   FILE *diagfile;
 134   struct { adns_query head, tail; } timew, childw, output;
 135   int nextid, udpsocket, tcpsocket;
 136   vbuf rqbuf, tcpsend, tcprecv;
 137   int nservers, tcpserver;
 138   enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
 139   struct timeval tcptimeout;
 140   struct server {
 141     struct in_addr addr;
 142   } servers[MAXSERVERS];
 143 };
 144
 145 /* From setup.c: */
 146
 147 void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
 148                  int serv, const char *fmt, va_list al);
 149 void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
 150 void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
 151 void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
 152
 153 int adns__vbuf_ensure(vbuf *vb, int want);
 154 int adns__vbuf_append(vbuf *vb, const byte *data, int len);
 155 /* 1=>success, 0=>realloc failed */
 156 void adns__vbuf_appendq(vbuf *vb, const byte *data, int len);
 157 void adns__vbuf_init(vbuf *vb);
 158
 159 int adns__setnonblock(adns_state ads, int fd); /* => errno value */
 160
 161 /* From submit.c: */
 162
 163 void adns__query_nomem(adns_state ads, adns_query qu);
 164 void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
 165
 166 /* From query.c: */
 167
 168 void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
 169 void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
 170 adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
 171                           adns_rrtype type, adns_queryflags flags);
 172
 173 /* From reply.c: */
 174
 175 void adns__procdgram(adns_state ads, const byte *dgram, int len, int serv);
 176
 177 /* From event.c: */
 178
 179 void adns__tcp_broken(adns_state ads, const char *what, const char *why);
 180 void adns__tcp_tryconnect(adns_state ads, struct timeval now);
 181 void adns__autosys(adns_state ads, struct timeval now);
 182
 183 /* Useful static inline functions: */
 184
 185 static inline void timevaladd(struct timeval *tv_io, long ms) {
 186   struct timeval tmp;
 187   assert(ms>=0);
 188   tmp= *tv_io;
 189   tmp.tv_usec += (ms%1000)*1000000;
 190   tmp.tv_sec += ms/1000;
 191   if (tmp.tv_usec >= 1000000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
 192   *tv_io= tmp;
 193 }
 194
 195 static inline int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
 196 static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
 197
 198 /* Useful macros */
 199
 200 #define LIST_INIT(list) ((list).head= (list).tail= 0)
 201
 202 #define LIST_UNLINK_PART(list,node,part) \
 203   do { \
 204     if ((node)->back) (node)->back->part next= (node)->part next; \
 205       else                        (list).head= (node)->part next; \
 206     if ((node)->next) (node)->next->part back= (node)->part back; \
 207       else                        (list).tail= (node)->part back; \
 208   } while(0)
 209
 210 #define LIST_LINK_TAIL_PART(list,node,part) \
 211   do { \
 212     (node)->part back= 0; \
 213     (node)->part next= (list).tail; \
 214     if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
 215     (list).tail= (node); \
 216   } while(0)
 217
 218 #define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
 219 #define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)
 220
 221 #endif