libcurl (7.19,7) crashes with _mdns_query_callback on OSX (10.6.8)
my application crashes using libcurl for some unknown reason. It crashed spontaneously after many loops of the same code while using Guard Malloc.
Libcurl version information:
curl 7.19.7 (universal-apple-darwin10.0) libcurl/7.19.7 OpenSSL/0.9.8r zlib/1.2.3 Protocols: tftp ftp telnet dict ldap http file https ftps Features: GSS-Negotiate IPv6 Largefile NTLM SSL libz
Sourcecode:
char * process_url(char * url,char * post){
CURLcode res;
curl_easy_reset(curl);
if(curl){
curl_easy_setopt(curl, CURLOPT_URL, url);
curl_easy_setopt(curl, CURLOPT_TIMEOUT, 10);
curl_easy_setopt(curl, CURLOPT_POSTREDIR,CURL_REDIR_POST_ALL);
curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION,1L);
curl_easy_setopt(curl, CURLOPT_USERAGENT, "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_6_8) AppleWebKit/535.1 (KHTML, like Gecko) Chrome/13.0.782.107 Safari/535.1");
curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION,write_to_string);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, 0L);
curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, 0L);
if (post) {
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, post);
}
ResponseStruct result;开发者_如何学运维
result.response = malloc(sizeof(char));
result.response[0] = '\0';
result.length = 1;
curl_easy_setopt(curl, CURLOPT_WRITEDATA, &result);
res = curl_easy_perform(curl); //CRASHED HERE
if (res) {
printf("CURL FAILED WITH ERROR CODE %i\n",(int)res);
return NULL;
}
sec_sleep(1); //Prevent passing float limit.
return result.response;
}
return NULL;
}
Here is the function stack:
#0 0x7fff869d22ae in _mdns_query_callback
#1 0x7fff869bfc29 in handle_query_response
#2 0x7fff869bf08b in DNSServiceProcessResult
#3 0x7fff869d1a71 in _mdns_query_mDNSResponder
#4 0x7fff869d0c61 in _mdns_search
#5 0x7fff869cfffc in _mdns_addrinfo
#6 0x7fff869cf059 in search_addrinfo
#7 0x7fff869cea7a in si_addrinfo
#8 0x7fff869ce48d in getaddrinfo
#9 0x7fff831695fc in Curl_getaddrinfo_ex
#10 0x7fff83164a3d in Curl_getaddrinfo
#11 0x7fff8313dda3 in Curl_resolv
#12 0x7fff8313dfb6 in Curl_resolv_timeout
#13 0x7fff8314b225 in resolve_server
#14 0x7fff83150aaf in create_conn
#15 0x7fff83150c08 in Curl_connect
#16 0x7fff8315b817 in Curl_perform
#17 0x100001126 in process_url at main.c:90
#18 0x1000013f7 in cancel_outstanding_order at main.c:158
#19 0x100002aac in main at main.c:554
There are no threads used in the program. I checked my data int he debugger and it is fine. libcurl doesn't like something. Are there any solutions?
Thank you.
getaddrinfo() is a libc call that your operating system (OS X) provides.
As libcurl uses the exact same name resolve function for many operating systems where it doesn't crash I would say that it indicate that the problem is truly in OS X and not in libcurl.
I've never seen this bug reported though, which is odd if it truly is a bug in OS X but then I also never saw it reported on libcurl. Possibly that would suggest that the problem is rather in your application...
If you can repeat the problem with a stand-alone example program, then providing that to the curl project and ask them (us) to help you debug it could be an idea. If you cannot repeat it with a small program it would be another indication that the problem is rather caused by your application!
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