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POc query txt record
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copied!<p>Every body, I have write program to read the dns txt record, but it has some issue, who can tell my why? Following is my source code</p> <pre><code>char blockItem[512]; bzero(blockItem,512); /*Temp Save the txt record value*/ int responseLength; /*The Length of response*/ int i; /*For Loop Controller*/ ns_msg query_parse_msg; /*List of response message * For txt record , It sould only one response! * */ ns_rr query_parse_rr; /*One response message*/ u_char responseByte[512]; /*Variable that for storage query answer.*/ bzero(responseByte,512); /*Clear variable*/ if ((responseLength = res_query(host,C_IN,T_TXT,responseByte,512)) < 0) { /*Query DNS Server*/ return HOSTNOTFIND; } else { if (ns_initparse(responseByte,responseLength,&query_parse_msg) < 0) { /*Pass the answer to ns_msg(May be it mean cut the dns header)*/ printf("%s\n","Cannot Read response Message"); return NOTSUCCESSFUL; } else { for (i =0;i < ns_msg_count(query_parse_msg,ns_s_an);i++) { /*Count the toolly response*/ if (ns_parserr(&query_parse_msg,ns_s_an,i,&query_parse_rr)) { /*Pass the msg list to rr.*/ printf("%s\n","Parse failed!"); return NOTSUCCESSFUL; } else { u_char const *rdata = (u_char*)(ns_rr_rdata(query_parse_rr) ); char *blockItem; blockItem=(char*)rdata; blockItem[strlen((char*)rdata)-2] = '\0'; /*Pass the ns_rr to char data type.*/ printf("Normal:%s\n",(u_char *)blockItem); } } } </code></pre> <p>OutPut: <code>Fv=spf1 redirect=_spf.google.com</code></p> <p>But original txt record should be <code>v=spf1 redirect=_spf.google.com</code></p> <p>My issue is <code>u_char const *rdata = (u_char*)(ns_rr_rdata(query_parse_rr) )</code></p> <p>If i change it to <code>u_char const *rdata = (u_char*)(ns_rr_rdata(query_parse_rr) +1)</code></p> <p>Output will change to: <code>v=spf1 redirect=_spf.google.com</code></p> <p>Also , I has refer how to query MX record, i found that has +2, Anything can tell me why??</p>

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