int dns_getaddr(const char *host, struct in_addr *addr, st_utime_t timeout)
{
char name[MAXDNAME], **domain;
const char *cp;
int s, n, maxlen, dots;
int trailing_dot, tried_as_is;
st_netfd_t nfd;
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
h_errno = NETDB_INTERNAL;
return -1;
}
if (_res.options & RES_USEVC) {
h_errno = NETDB_INTERNAL;
errno = ENOSYS;
return -1;
}
if (!host || *host == '\0') {
h_errno = HOST_NOT_FOUND;
return -1;
}
/* Create UDP socket */
if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
h_errno = NETDB_INTERNAL;
return -1;
}
if ((nfd = st_netfd_open_socket(s)) == NULL) {
h_errno = NETDB_INTERNAL;
n = errno;
close(s);
errno = n;
return -1;
}
maxlen = sizeof(name) - 1;
n = 0;
dots = 0;
trailing_dot = 0;
tried_as_is = 0;
for (cp = host; *cp && n < maxlen; cp++) {
dots += (*cp == '.');
name[n++] = *cp;
}
if (name[n - 1] == '.')
trailing_dot = 1;
/*
* If there are dots in the name already, let's just give it a try
* 'as is'. The threshold can be set with the "ndots" option.
*/
if (dots >= _res.ndots) {
if (query_domain(nfd, host, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
tried_as_is = 1;
}
/*
* We do at least one level of search if
* - there is no dot and RES_DEFNAME is set, or
* - there is at least one dot, there is no trailing dot,
* and RES_DNSRCH is set.
*/
if ((!dots && (_res.options & RES_DEFNAMES)) ||
(dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
name[n++] = '.';
for (domain = _res.dnsrch; *domain; domain++) {
strncpy(name + n, *domain, maxlen - n);
if (query_domain(nfd, name, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
if (!(_res.options & RES_DNSRCH))
break;
}
}
/*
* If we have not already tried the name "as is", do that now.
* note that we do this regardless of how many dots were in the
* name or whether it ends with a dot.
*/
if (!tried_as_is) {
if (query_domain(nfd, host, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
}
CLOSE_AND_RETURN(-1);
}
int main (int argc, char *argv[])
{
int sd, newSd, cliLen;
struct sockaddr_in cliAddr, servAddr;
char line[MAX_MSG];
char return_buffer[RB_LENGTH];
char no_result[10]="NO RESULT";
char ret_svr[10]="127.0.0.1";
memset(return_buffer, 0, 2048);
printf("WIT/WHOIS Prototype server for The OpenNIC Project. By Martin Coleman. Public Domain.\n");
/* create socket */
sd = socket(AF_INET, SOCK_STREAM, 0);
if(sd<0)
{
fprintf(stderr, "cannot open socket\n");
return ERROR;
}
/* bind server port */
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
servAddr.sin_port = htons(SERVER_PORT);
if(bind(sd, (struct sockaddr *) &servAddr, sizeof(servAddr))<0)
{
fprintf(stderr, "cannot bind port\n");
return ERROR;
}
listen(sd,5);
while(1)
{
#ifdef VERBOSE
printf("%s: waiting for data on port TCP %u\n",argv[0],SERVER_PORT);
#endif
cliLen = sizeof(cliAddr);
newSd = accept(sd, (struct sockaddr *) &cliAddr, &cliLen);
if(newSd<0)
{
fprintf(stderr, "cannot accept connection\n");
return ERROR;
}
/* init line */
memset(line, 0, MAX_MSG);
/* receive segments */
int rc=0;
if(rc=recv(newSd, line, MAX_MSG, 0))
{
chomp(line);
#ifdef VERBOSE
printf("query received from %s for %s\n", inet_ntoa(cliAddr.sin_addr), line);
#endif
if(!query_domain(line))
{
send(newSd, no_result, 10, 0);
} else {
sprintf(return_buffer, "%s\r\n", domain_record);
send(newSd, return_buffer, RB_LENGTH, 0);
}
memset(line, 0, MAX_MSG);
memset(return_buffer, 0, 2048);
}
close(newSd);
memset(line, 0, MAX_MSG);
}
}
int main (int argc, char *argv[])
{
int sd, newSd, cliLen;
struct sockaddr_in cliAddr, servAddr;
char line[MAX_MSG];
char return_buffer[RB_LENGTH];
char no_result[10]="NO RESULT";
char ret_svr[10]="127.0.0.1";
printf("WIT/WHOIS server for The OpenNIC Project. Rev.4 (C) 2012 Martin COLEMAN.\n");
/* create socket */
sd = socket(AF_INET, SOCK_STREAM, 0);
if(sd<0)
{
fprintf(stderr, "cannot open socket\n");
return ERROR;
}
/* bind server port */
servAddr.sin_family = AF_INET;
servAddr.sin_addr.s_addr = htonl(INADDR_ANY);
servAddr.sin_port = htons(SERVER_PORT);
if(bind(sd, (struct sockaddr *) &servAddr, sizeof(servAddr))<0)
{
fprintf(stderr, "cannot bind port\n");
return ERROR;
}
listen(sd,5);
while(1)
{
#ifdef VERBOSE
printf("%s: waiting for data on port TCP %u\n",argv[0],SERVER_PORT);
#endif
cliLen = sizeof(cliAddr);
newSd = accept(sd, (struct sockaddr *) &cliAddr, &cliLen);
if(newSd<0)
{
fprintf(stderr, "cannot accept connection\n");
return ERROR;
}
/* init line */
memset(line, 0, MAX_MSG);
/* receive segments */
int rc=0;
if(rc=recv(newSd, line, MAX_MSG, 0))
{
chomp(line);
#ifdef VERBOSE
printf("query received from %s for %s\n", inet_ntoa(cliAddr.sin_addr), line);
#endif
query_domain(line);
#ifdef DEBUG
printf("[%s] [%s]\n", line, DOMAINRECORD.dr_domain);
#endif
if(strcmp(line, DOMAINRECORD.dr_domain))
{
send(newSd, no_result, 10, 0);
} else {
#ifdef DEBUG
#ifdef VERBOSE
printf("Domain: %s\nRegistered: %s\nName: %s\nEmail: %s\n\r\n", DOMAINRECORD.dr_domain, DOMAINRECORD.dr_registered, DOMAINRECORD.dr_name, DOMAINRECORD.dr_email); /* this is probably not needed anymore. M. */
#endif
#endif
sprintf(return_buffer, "Welcome to the OpenNIC Registry!\r\nDomain: %s.oz\r\nDomain Registered: %s\r\nDomain Expires: %s\r\nDomain Updated: %s\r\nDomain Status: Active\r\nRegistrant Name: %s\r\nRegistrant Email: %s\r\nNS1: %s\r\nNS2: %s\r\nRegistrar URL: www.opennic.oz\r\n", DOMAINRECORD.dr_domain, DOMAINRECORD.dr_registered, DOMAINRECORD.expires, DOMAINRECORD.updated, DOMAINRECORD.dr_name, DOMAINRECORD.dr_email, DOMAINRECORD.ns1, DOMAINRECORD.ns2);
send(newSd, return_buffer, RB_LENGTH, 0);
}
memset(line, 0, MAX_MSG);
DOMAINRECORD.dr_domain[0]='\0';
DOMAINRECORD.dr_registered[0]='\0';
DOMAINRECORD.expires[0]='\0';
DOMAINRECORD.updated[0]='\0';
DOMAINRECORD.dr_name[0]='\0';
DOMAINRECORD.dr_email[0]='\0';
DOMAINRECORD.ns1[0]='\0';
DOMAINRECORD.ns2[0]='\0';
}
close(newSd);
memset(line, 0, MAX_MSG);
}
}
int dns_getaddr(const char *hosttest, struct in_addr *addr, st_utime_t timeout)
{
//return 0;
// host="www.baidu.com";
#if 0
char *host=malloc(128);
memset(host,0,128);
strcpy(host,hosttest);
#endif
char host[128];
memset(host,0,128);
strcpy(host,hosttest);
LOGD("hosttest [%s] host[%s]",hosttest,host);
char name[MAXDNAME], **domain;
const char *cp;
int s, n, maxlen, dots;
int trailing_dot, tried_as_is;
st_netfd_t nfd;
if ((_res.options & RES_INIT) == 0 && res_init() == -1) {
h_errno = NETDB_INTERNAL;
return -1;
}
if (_res.options & RES_USEVC) {
h_errno = NETDB_INTERNAL;
errno = ENOSYS;
return -1;
}
if (!host || *host == '\0') {
h_errno = HOST_NOT_FOUND;
return -1;
}
/* Create UDP socket */
if ((s = socket(PF_INET, SOCK_DGRAM, 0)) < 0) {
h_errno = NETDB_INTERNAL;
return -1;
}
if ((nfd = st_netfd_open_socket(s)) == NULL) {
h_errno = NETDB_INTERNAL;
n = errno; //n用来记录错误号
close(s);
errno = n;
return -1;
}
//可以走到这里
maxlen = sizeof(name) - 1;
LOGD("maxlen[%d]",maxlen);
n = 0; //此时n是计数器
dots = 0;
trailing_dot = 0;
tried_as_is = 0;
for (cp = host; *cp && n < maxlen; cp++) {
//dots记录host中有几个.
dots += (*cp == '.'); //走这里
name[n++] = *cp; //看起来好像是复制host到name中
}
//n是后加，所以n-1，此时n-1对应的是最后一个字符
if (name[n - 1] == '.')
trailing_dot = 1;
LOGD("========AAA===name[%s]=========",name);
/*
* If there are dots in the name already, let's just give it a try
* 'as is'. The threshold can be set with the "ndots" option.
*/
if (dots >= _res.ndots) {
if (query_domain(nfd, host, addr, timeout) == 0)
{
/*貌似我的query域名就是返回0，只好关闭并且退出了*/
// LOGD("query_domain return 0");
/*不管我是否注释掉这句话都有段错误*/
return 0;
#if 0
CLOSE_AND_RETURN(0);
#else
int ret=0;
LOGD("===BB==========");
// LOGD("%-40s %s", (char *)host, inet_ntoa(addr));
// LOGD("DO RETURN ret[%d]",ret);
//LOGD(" errno[%d]",errno);
// n = errno;
// st_netfd_close(nfd);
// errno = n;
return -1;
// goto ZBTEST;
#endif
//下面这句话不被执行，上面的return直接退出了这个函数
slogi("query_domain WILL NOT HERE");
}
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
tried_as_is = 1;
}
/*
* We do at least one level of search if
* - there is no dot and RES_DEFNAME is set, or
* - there is at least one dot, there is no trailing dot,
* and RES_DNSRCH is set.
*/
if ((!dots && (_res.options & RES_DEFNAMES)) ||
(dots && !trailing_dot && (_res.options & RES_DNSRCH))) {
name[n++] = '.';
for (domain = _res.dnsrch; *domain; domain++) {
strncpy(name + n, *domain, maxlen - n);
if (query_domain(nfd, name, addr, timeout) == 0)
CLOSE_AND_RETURN(0);
if (h_errno == NETDB_INTERNAL && errno == EINTR)
CLOSE_AND_RETURN(-1);
if (!(_res.options & RES_DNSRCH))
break;
}
}
/*
* If we have not already tried the name "as is", do that now.
* note that we do this regardless of how many dots were in the
* name or whether it ends with a dot.
*/
if (!tried_as_is) {
if (query_domain(nfd, host, addr, timeout) == 0)
{
//LOGD("===HERE=query_domain");
LOGD("----1----query_domain------");
CLOSE_AND_RETURN(0);
}
}
CLOSE_AND_RETURN(-1);
// ZBTEST:
// LOGD("ZBTEST");
// return 0;
}
