3 #ifndef ADNS_INTERNAL_H_INCLUDED
4 #define ADNS_INTERNAL_H_INCLUDED
6 #define PRINTFFORMAT(a,b) __attribute__((format(printf,a,b)))
7 typedef unsigned char byte;
17 /* Configuration and constants */
20 #define MAXUDPRETRIES 15
21 #define UDPRETRYMS 2000
23 #define LOCALRESOURCEMS 20
24 #define MAXUDPDGRAM 512
28 /* Shared data structures */
50 /* FIXME: make sure this is all init'd properly */
51 enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
52 adns_query back, next, parent;
53 struct { adns_query head, tail; } children;
54 struct { adns_query back, next; } siblings;
57 int id, flags, udpretries;
59 unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
60 struct timeval timeout;
65 /* After the owner name and nul comes the query message, pointed to by querymsg */
69 * state Queue child id answer nextudpserver sentudp failedtcp
71 * udp NONE null >=0 null 0 zero zero
72 * udp timew null >=0 null any nonzero zero
73 * udp NONE null >=0 null any nonzero zero
75 * tcpwait timew null >=0 null irrelevant zero any
76 * tcpsent timew null >=0 null irrelevant zero any
78 * child childw set >=0 partial irrelevant irrelevant irrelevant
79 * done output null -1 set/null irrelevant irrelevant irrelevant
81 * +------------------------+
82 * START -----> | udp/NONE |
83 * +------------------------+
85 * too big for UDP / UDP timeout \ \ send via UDP
86 * do this ASAP! / more retries \ \ do this ASAP!
88 * +---------------+ +-----------+
89 * | tcpwait/timew | ____ | udp/timew |
90 * +---------------+ \ +-----------+
92 * TCP conn'd; | | TCP died | | |
93 * send via TCP | | more | UDP timeout | |
94 * do this ASAP! | | servers | no more | |
95 * v | to try | retries | |
96 * +---------------+ | desired | |
97 * | tcpsent/timew | ____ | | |
98 * +---------------+ \| | |
99 * \ \ TCP died | TCP | |
100 * \ \ no more | timeout / |
104 * reply \ _| +------------------+ / reply
105 * \ | done/output FAIL | /
106 * \ +------------------+ /
109 * (..... got reply ....)
111 * need child query/ies / \ no child query
114 * +--------------+ +----------------+
115 * | child/childw | ----------------> | done/output OK |
116 * +--------------+ children done +----------------+
121 adns_initflags iflags;
123 struct { adns_query head, tail; } timew, childw, output;
124 int nextid, udpsocket, tcpsocket;
125 vbuf rqbuf, tcpsend, tcprecv;
126 int nservers, tcpserver;
127 enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
128 struct timeval tcptimeout;
131 } servers[MAXSERVERS];
136 void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
137 int serv, const char *fmt, va_list al);
138 void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
139 void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
140 void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
142 int adns__vbuf_ensure(vbuf *vb, int want);
143 int adns__vbuf_append(vbuf *vb, const byte *data, int len);
144 /* 1=>success, 0=>realloc failed */
145 void adns__vbuf_appendq(vbuf *vb, const byte *data, int len);
146 void adns__vbuf_init(vbuf *vb);
148 int adns__setnonblock(adns_state ads, int fd); /* => errno value */
152 void adns__query_nomem(adns_state ads, adns_query qu);
153 void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
157 void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
158 void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
159 adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
160 adns_rrtype type, adns_queryflags flags);
164 void adns__procdgram(adns_state ads, const byte *dgram, int len, int serv);
168 void adns__tcp_broken(adns_state ads, const char *what, const char *why);
169 void adns__tcp_tryconnect(adns_state ads, struct timeval now);
170 void adns__autosys(adns_state ads, struct timeval now);
172 /* Useful static inline functions: */
174 static inline void timevaladd(struct timeval *tv_io, long ms) {
178 tmp.tv_usec += (ms%1000)*1000;
179 tmp.tv_sec += ms/1000;
180 if (tmp.tv_usec >= 1000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
184 static inline int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
185 static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
189 #define LIST_INIT(list) ((list).head= (list).tail= 0)
191 #define LIST_UNLINK_PART(list,node,part) \
193 if ((node)->back) (node)->back->part next= (node)->part next; \
194 else (list).head= (node)->part next; \
195 if ((node)->next) (node)->next->part back= (node)->part back; \
196 else (list).tail= (node)->part back; \
199 #define LIST_LINK_TAIL_PART(list,node,part) \
201 (node)->part back= 0; \
202 (node)->part next= (list).tail; \
203 if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
204 (list).tail= (node); \
207 #define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
208 #define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)