Migrated from linuxjunk…<\/p>\n
Compile with g++ code.cpp -lcurl -o randpages. Creates random IP addresses, then attempts to grab a page from http:\/\/IP using libcurl. Reports those that reply.<\/p>\n
#include using namespace std;<\/p>\n struct MemoryStruct { static size_t mem->memory = (char *) realloc(mem->memory, mem->size + realsize + 1); memcpy(&(mem->memory[mem->size]), ptr, realsize); return realsize; string fetch_url(string url,bool &fail) { struct MemoryStruct chunk;<\/p>\n chunk.memory =(char*) malloc(1); \/* will be grown as needed by the realloc above *\/ curl_global_init(CURL_GLOBAL_ALL);<\/p>\n \/* init the curl session *\/ \/* specify URL to get *\/ \/* send all data to this function *\/ \/* we pass our ‘chunk’ struct to the callback function *\/ \/* some servers don’t like requests that are made without a user-agent \/* get it! *\/ fail = false; \/* cleanup curl stuff *\/ \/* string s = chunk.memory; \/* we’re done with libcurl, so clean it up *\/ return s; string rand_ip() {<\/p>\n \/\/ anything but localhost please! string s = stringify(top) + “.” + stringify(rand()%256) + “.” + stringify(rand()%256) + “.” + stringify(rand()%256);<\/p>\n return s; string rand_url(bool &fail) {<\/p>\n string current_address;<\/p>\n bool no_address = true;<\/p>\n string ip = rand_ip(); string doc = fetch_url(current_address,fail);<\/p>\n return ip; size_t failed_connections = 0; if(argc < 1) cout << \"randpages for(;;) { if(fail) { failed_connections++; } else { valid_connections++; }<\/p>\n if(!fail) cout << url << \" \" << valid_connections << \" \" << failed_connections << endl;\n }\n}\n[\/sourcecode]\n<\/p>\n","protected":false},"excerpt":{"rendered":" Migrated from linuxjunk… Compile with g++ code.cpp -lcurl -o randpages. Creates random IP addresses, then attempts to grab a page from http:\/\/IP using libcurl. Reports those that reply. #include #include #include “stringify.h” #include #include #include using namespace std; struct MemoryStruct { char *memory; size_t size; }; static size_t WriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[1],"tags":[],"class_list":["post-327","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/p1RRoU-5h","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/327","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/comments?post=327"}],"version-history":[{"count":2,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/327\/revisions"}],"predecessor-version":[{"id":329,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/posts\/327\/revisions\/329"}],"wp:attachment":[{"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/media?parent=327"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/categories?post=327"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/41j.com\/blog\/wp-json\/wp\/v2\/tags?post=327"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}
\n#include
\n#include “stringify.h”
\n#include
\n#include
\n#include
\n char *memory;
\n size_t size;
\n};<\/p>\n
\nWriteMemoryCallback(void *ptr, size_t size, size_t nmemb, void *data)
\n{
\n size_t realsize = size * nmemb;
\n struct MemoryStruct *mem = (struct MemoryStruct *)data;<\/p>\n
\n if (mem->memory == NULL) {
\n \/* out of memory! *\/
\n printf(“not enough memory (realloc returned NULL)\\n”);
\n exit(EXIT_FAILURE);
\n }<\/p>\n
\n mem->size += realsize;
\n mem->memory[mem->size] = 0;<\/p>\n
\n}<\/p>\n
\n CURL *curl_handle;<\/p>\n
\n chunk.size = 0; \/* no data at this point *\/<\/p>\n
\n curl_handle = curl_easy_init();
\n curl_easy_setopt(curl_handle, CURLOPT_CONNECTTIMEOUT, 3);
\n curl_easy_setopt(curl_handle, CURLOPT_TIMEOUT, 3);<\/p>\n
\n curl_easy_setopt(curl_handle, CURLOPT_URL, url.c_str());<\/p>\n
\n curl_easy_setopt(curl_handle, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);<\/p>\n
\n curl_easy_setopt(curl_handle, CURLOPT_WRITEDATA, (void *)&chunk);<\/p>\n
\n field, so we provide one *\/
\n curl_easy_setopt(curl_handle, CURLOPT_USERAGENT, “libcurl-agent\/1.0”);<\/p>\n
\n CURLcode res = curl_easy_perform(curl_handle);<\/p>\n
\n if(res != 0) fail = true;
\n \/\/ if(doc.size() == 0) fail = true;<\/p>\n
\n curl_easy_cleanup(curl_handle);<\/p>\n
\n * Now, our chunk.memory points to a memory block that is chunk.size
\n * bytes big and contains the remote file.
\n *
\n * Do something nice with it!
\n *
\n * You should be aware of the fact that at this point we might have an
\n * allocated data block, and nothing has yet deallocated that data. So when
\n * you’re done with it, you should free() it as a nice application.
\n *\/
\n \/\/printf(“%lu bytes retrieved\\n”, (long)chunk.size);<\/p>\n
\n if(chunk.memory)
\n free(chunk.memory);<\/p>\n
\n curl_global_cleanup();<\/p>\n
\n}<\/p>\n
\n int top = 127;
\n for(;top==127;) top = rand()%256;<\/p>\n
\n}<\/p>\n
\n current_address = “http:\/\/” + ip;<\/p>\n
\n}
\nint main(int argc,char **argv) {<\/p>\n
\n size_t valid_connections = 0;<\/p>\n
\n bool fail = true;
\n string url = rand_url(fail);<\/p>\n