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 UDPMAXRETRIES /*15*/5
21 #define UDPRETRYMS 2000
23 #define LOCALRESOURCEMS 20
25 #define DNS_UDPPORT 53
26 #define DNS_MAXUDP 512
27 #define DNS_MAXDOMAIN 255
28 #define DNS_HDRSIZE 12
29 #define DNS_CLASS_IN 1
31 /* Shared data structures */
53 /* FIXME: make sure this is all init'd properly */
54 enum { query_udp, query_tcpwait, query_tcpsent, query_child, query_done } state;
55 adns_query back, next, parent;
56 struct { adns_query head, tail; } children;
57 struct { adns_query back, next; } siblings;
60 int id, flags, udpretries;
62 unsigned long udpsent, tcpfailed; /* bitmap indexed by server */
63 struct timeval timeout;
68 /* After the owner name and nul comes the query message, pointed to by querymsg */
72 * state Queue child id answer nextudpserver sentudp failedtcp
74 * udp NONE null >=0 null 0 zero zero
75 * udp timew null >=0 null any nonzero zero
76 * udp NONE null >=0 null any nonzero zero
78 * tcpwait timew null >=0 null irrelevant zero any
79 * tcpsent timew null >=0 null irrelevant zero any
81 * child childw set >=0 partial irrelevant irrelevant irrelevant
82 * done output null -1 set/null irrelevant irrelevant irrelevant
84 * +------------------------+
85 * START -----> | udp/NONE |
86 * +------------------------+
88 * too big for UDP / UDP timeout \ \ send via UDP
89 * do this ASAP! / more retries \ \ do this ASAP!
91 * +---------------+ +-----------+
92 * | tcpwait/timew | ____ | udp/timew |
93 * +---------------+ \ +-----------+
95 * TCP conn'd; | | TCP died | | |
96 * send via TCP | | more | UDP timeout | |
97 * do this ASAP! | | servers | no more | |
98 * v | to try | retries | |
99 * +---------------+ | desired | |
100 * | tcpsent/timew | ____ | | |
101 * +---------------+ \| | |
102 * \ \ TCP died | TCP | |
103 * \ \ no more | timeout / |
107 * reply \ _| +------------------+ / reply
108 * \ | done/output FAIL | /
109 * \ +------------------+ /
112 * (..... got reply ....)
114 * need child query/ies / \ no child query
117 * +--------------+ +----------------+
118 * | child/childw | ----------------> | done/output OK |
119 * +--------------+ children done +----------------+
124 adns_initflags iflags;
126 struct { adns_query head, tail; } timew, childw, output;
127 int nextid, udpsocket, tcpsocket;
128 vbuf rqbuf, tcpsend, tcprecv;
129 int nservers, tcpserver;
130 enum adns__tcpstate { server_disconnected, server_connecting, server_ok } tcpstate;
131 struct timeval tcptimeout;
134 } servers[MAXSERVERS];
139 void adns__vdiag(adns_state ads, const char *pfx, adns_initflags prevent,
140 int serv, const char *fmt, va_list al);
141 void adns__debug(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
142 void adns__warn(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
143 void adns__diag(adns_state ads, int serv, const char *fmt, ...) PRINTFFORMAT(3,4);
145 int adns__vbuf_ensure(vbuf *vb, int want);
146 int adns__vbuf_append(vbuf *vb, const byte *data, int len);
147 /* 1=>success, 0=>realloc failed */
148 void adns__vbuf_appendq(vbuf *vb, const byte *data, int len);
149 void adns__vbuf_init(vbuf *vb);
151 int adns__setnonblock(adns_state ads, int fd); /* => errno value */
155 void adns__query_nomem(adns_state ads, adns_query qu);
156 void adns__query_fail(adns_state ads, adns_query qu, adns_status stat);
160 void adns__query_udp(adns_state ads, adns_query qu, struct timeval now);
161 void adns__query_tcp(adns_state ads, adns_query qu, struct timeval now);
162 adns_status adns__mkquery(adns_state ads, const char *owner, int ol, int id,
163 adns_rrtype type, adns_queryflags flags);
167 void adns__procdgram(adns_state ads, const byte *dgram, int len, int serv);
171 void adns__tcp_broken(adns_state ads, const char *what, const char *why);
172 void adns__tcp_tryconnect(adns_state ads, struct timeval now);
173 void adns__autosys(adns_state ads, struct timeval now);
175 /* Useful static inline functions: */
177 static inline void timevaladd(struct timeval *tv_io, long ms) {
181 tmp.tv_usec += (ms%1000)*1000000;
182 tmp.tv_sec += ms/1000;
183 if (tmp.tv_usec >= 1000000) { tmp.tv_sec++; tmp.tv_usec -= 1000; }
187 static inline int ctype_whitespace(int c) { return c==' ' || c=='\n' || c=='\t'; }
188 static inline int ctype_digit(int c) { return c>='0' && c<='9'; }
192 #define LIST_INIT(list) ((list).head= (list).tail= 0)
194 #define LIST_UNLINK_PART(list,node,part) \
196 if ((node)->back) (node)->back->part next= (node)->part next; \
197 else (list).head= (node)->part next; \
198 if ((node)->next) (node)->next->part back= (node)->part back; \
199 else (list).tail= (node)->part back; \
202 #define LIST_LINK_TAIL_PART(list,node,part) \
204 (node)->part back= 0; \
205 (node)->part next= (list).tail; \
206 if ((list).tail) (list).tail->part back= (node); else (list).part head= (node); \
207 (list).tail= (node); \
210 #define LIST_UNLINK(list,node) LIST_UNLINK_PART(list,node,)
211 #define LIST_LINK_TAIL(list,node) LIST_LINK_TAIL_PART(list,node,)