2018-07-26 11:29:44 +02:00
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#include "link.h"
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#include "network.h"
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#include <gumbo.h>
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#include <ctype.h>
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#include <errno.h>
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#include <string.h>
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#include <unistd.h>
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#define HTTP_OK 200
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#define HTTP_PARTIAL_CONTENT 206
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#define HTTP_RANGE_NOT_SATISFIABLE 416
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/* ---------------- External variables -----------------------*/
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LinkTable *ROOT_LINK_TBL;
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static void HTML_to_LinkTable(GumboNode *node, LinkTable *linktbl);
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static Link *Link_new(const char *p_url, LinkType type);
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static CURL *Link_to_curl(Link *link);
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static void Link_get_stat(Link *this_link);
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static void LinkTable_add(LinkTable *linktbl, Link *link);
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void LinkTable_fill(LinkTable *linktbl);
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static void LinkTable_free(LinkTable *linktbl);
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static void LinkTable_print(LinkTable *linktbl);
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static Link *path_to_Link_recursive(char *path, LinkTable *linktbl);
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static LinkType p_url_type(const char *p_url);
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static char *url_append(const char *url, const char *sublink);
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/**
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* Shamelessly copied and pasted from:
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* https://github.com/google/gumbo-parser/blob/master/examples/find_links.cc
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*/
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static void HTML_to_LinkTable(GumboNode *node, LinkTable *linktbl)
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{
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if (node->type != GUMBO_NODE_ELEMENT) {
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return;
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}
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GumboAttribute* href;
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if (node->v.element.tag == GUMBO_TAG_A &&
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(href = gumbo_get_attribute(&node->v.element.attributes, "href"))) {
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/* if it is valid, copy the link onto the heap */
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LinkType type = p_url_type(href->value);
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if (type) {
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LinkTable_add(linktbl, Link_new(href->value, type));
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}
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}
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/* Note the recursive call, lol. */
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GumboVector *children = &node->v.element.children;
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for (size_t i = 0; i < children->length; ++i) {
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HTML_to_LinkTable((GumboNode*)children->data[i], linktbl);
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}
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return;
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}
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static Link *Link_new(const char *p_url, LinkType type)
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{
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Link *link = calloc(1, sizeof(Link));
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if (!link) {
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fprintf(stderr, "Link_new(): calloc failure!\n");
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exit(EXIT_FAILURE);
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}
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strncpy(link->p_url, p_url, LINK_LEN_MAX);
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link->type = type;
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/* remove the '/' from p_url if it exists */
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char *c = &(link->p_url[strnlen(link->p_url, LINK_LEN_MAX) - 1]);
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if ( *c == '/') {
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*c = '\0';
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}
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return link;
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}
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static CURL *Link_to_curl(Link *link)
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{
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CURL *curl = curl_easy_init();
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if (!curl) {
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fprintf(stderr, "Link_to_curl(): curl_easy_init() failed!\n");
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}
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/* set up some basic curl stuff */
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2018-07-26 11:58:51 +02:00
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curl_easy_setopt(curl, CURLOPT_USERAGENT, "HTTPDirFS");
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2018-07-26 11:29:44 +02:00
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curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);
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curl_easy_setopt(curl, CURLOPT_FOLLOWLOCATION, 1);
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/* for following directories without the '/' */
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curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 2);
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curl_easy_setopt(curl, CURLOPT_URL, link->f_url);
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curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1);
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curl_easy_setopt(curl, CURLOPT_CONNECTTIMEOUT, 15);
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curl_easy_setopt(curl, CURLOPT_SHARE, curl_share);
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/*
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* The write back function pointer has to be set at curl handle creation,
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* for thread safety
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*/
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, WriteMemoryCallback);
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return curl;
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}
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void Link_get_stat(Link *this_link)
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{
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fprintf(stderr, "Link_get_size(%s);\n", this_link->f_url);
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if (this_link->type == LINK_FILE) {
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CURL *curl = Link_to_curl(this_link);
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curl_easy_setopt(curl, CURLOPT_NOBODY, 1);
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curl_easy_setopt(curl, CURLOPT_FILETIME, 1L);
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/*
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* We need to put the variable on the heap, because otherwise the
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* variable gets popped from the stack as the function returns.
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*
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* It gets freed in curl_multi_perform_once();
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*/
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TransferStruct *transfer = malloc(sizeof(TransferStruct));
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if (!transfer) {
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fprintf(stderr, "Link_get_size(): malloc failed!\n");
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}
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transfer->link = this_link;
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transfer->type = FILESTAT;
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curl_easy_setopt(curl, CURLOPT_PRIVATE, transfer);
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transfer_nonblocking(curl);
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}
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}
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void Link_set_stat(Link* this_link, CURL *curl)
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{
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long http_resp;
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curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_resp);
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if (http_resp == HTTP_OK) {
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double cl = 0;
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curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);
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curl_easy_getinfo(curl, CURLINFO_FILETIME, &(this_link->time));
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if (cl == -1) {
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/* Turns out not to be a file after all */
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this_link->content_length = 0;
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this_link->type = LINK_DIR;
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} else {
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this_link->content_length = cl;
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this_link->type = LINK_FILE;
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}
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} else {
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this_link->type = LINK_INVALID;
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}
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}
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static void LinkTable_add(LinkTable *linktbl, Link *link)
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{
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linktbl->num++;
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linktbl->links = realloc(linktbl->links, linktbl->num * sizeof(Link *));
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if (!linktbl->links) {
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fprintf(stderr, "LinkTable_add(): realloc failure!\n");
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exit(EXIT_FAILURE);
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}
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linktbl->links[linktbl->num - 1] = link;
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}
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void LinkTable_fill(LinkTable *linktbl)
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{
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Link *head_link = linktbl->links[0];
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for (int i = 0; i < linktbl->num; i++) {
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Link *this_link = linktbl->links[i];
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if (this_link->type) {
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char *url;
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url = url_append(head_link->f_url, this_link->p_url);
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strncpy(this_link->f_url, url, URL_LEN_MAX);
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free(url);
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char *unescaped_p_url;
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unescaped_p_url = curl_easy_unescape(NULL, this_link->p_url, 0,
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NULL);
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strncpy(this_link->p_url, unescaped_p_url, LINK_LEN_MAX);
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curl_free(unescaped_p_url);
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if (this_link->type == LINK_FILE && !(this_link->content_length)) {
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Link_get_stat(this_link);
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} else if (this_link->type == LINK_DIR) {
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this_link->time = head_link->time;
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}
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}
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}
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/* Block until the LinkTable is filled up */
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while (curl_multi_perform_once()) {
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usleep(1000);
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}
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}
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static void LinkTable_free(LinkTable *linktbl)
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{
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for (int i = 0; i < linktbl->num; i++) {
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free(linktbl->links[i]);
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}
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free(linktbl->links);
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free(linktbl);
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}
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LinkTable *LinkTable_new(const char *url)
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{
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fprintf(stderr, "LinkTable_new(%s);\n", url);
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LinkTable *linktbl = calloc(1, sizeof(LinkTable));
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if (!linktbl) {
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fprintf(stderr, "LinkTable_new(): calloc failure!\n");
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exit(EXIT_FAILURE);
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}
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/* populate the base URL */
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LinkTable_add(linktbl, Link_new("/", LINK_HEAD));
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Link *head_link = linktbl->links[0];
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head_link->type = LINK_HEAD;
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strncpy(head_link->f_url, url, URL_LEN_MAX);
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/* start downloading the base URL */
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CURL *curl = Link_to_curl(head_link);
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MemoryStruct buf;
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buf.size = 0;
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buf.memory = NULL;
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&buf);
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transfer_blocking(curl);
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/* if downloading base URL failed */
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long http_resp;
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curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_resp);
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if (http_resp != HTTP_OK) {
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fprintf(stderr, "link.c: LinkTable_new() cannot retrive the base URL, \
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URL: %s, HTTP %ld\n", url, http_resp);
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LinkTable_free(linktbl);
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linktbl = NULL;
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return linktbl;
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};
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curl_easy_getinfo(curl, CURLINFO_FILETIME, &(head_link->time));
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curl_easy_cleanup(curl);
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/* Otherwise parsed the received data */
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GumboOutput* output = gumbo_parse(buf.memory);
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HTML_to_LinkTable(output->root, linktbl);
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gumbo_destroy_output(&kGumboDefaultOptions, output);
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free(buf.memory);
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/* Fill in the link table */
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LinkTable_fill(linktbl);
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return linktbl;
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}
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/** \brief print a LinkTable */
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static void LinkTable_print(LinkTable *linktbl)
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{
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fprintf(stderr, "--------------------------------------------\n");
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fprintf(stderr, " LinkTable %p for %s\n", linktbl,
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linktbl->links[0]->f_url);
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fprintf(stderr, "--------------------------------------------\n");
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for (int i = 0; i < linktbl->num; i++) {
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Link *this_link = linktbl->links[i];
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fprintf(stderr, "%d %c %lu %s %s\n",
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i,
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this_link->type,
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this_link->content_length,
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this_link->p_url,
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this_link->f_url
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);
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}
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fprintf(stderr, "--------------------------------------------\n");
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}
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Link *path_to_Link(const char *path)
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{
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char *new_path = strndup(path, URL_LEN_MAX);
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if (!new_path) {
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fprintf(stderr, "path_to_Link(): cannot allocate memory\n");
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exit(EXIT_FAILURE);
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}
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Link *link = path_to_Link_recursive(new_path, ROOT_LINK_TBL);
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free(new_path);
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return link;
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}
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static Link *path_to_Link_recursive(char *path, LinkTable *linktbl)
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{
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/* skip the leading '/' if it exists */
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if (*path == '/') {
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path++;
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}
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/* remove the last '/' if it exists */
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char *slash = &(path[strnlen(path, URL_LEN_MAX) - 1]);
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if (*slash == '/') {
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*slash = '\0';
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}
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slash = strchr(path, '/');
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if ( slash == NULL ) {
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/* We cannot find another '/', we have reached the last level */
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for (int i = 1; i < linktbl->num; i++) {
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if (!strncmp(path, linktbl->links[i]->p_url, LINK_LEN_MAX)) {
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/* We found our link */
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return linktbl->links[i];
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}
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}
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} else {
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/*
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* We can still find '/', time to consume the path and traverse
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* the tree structure
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*/
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/*
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* add termination mark to the current string,
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* effective create two substrings
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*/
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*slash = '\0';
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/* move the pointer past the '/' */
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char *next_path = slash + 1;
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for (int i = 1; i < linktbl->num; i++) {
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if (!strncmp(path, linktbl->links[i]->p_url, LINK_LEN_MAX)) {
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/* The next sub-directory exists */
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if (!(linktbl->links[i]->next_table)) {
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linktbl->links[i]->next_table = LinkTable_new(
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linktbl->links[i]->f_url);
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fprintf(stderr, "Created new link table for %s\n",
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linktbl->links[i]->f_url);
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LinkTable_print(linktbl->links[i]->next_table);
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}
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return path_to_Link_recursive(next_path,
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linktbl->links[i]->next_table);
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}
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}
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}
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return NULL;
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}
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long path_download(const char *path, char *output_buf, size_t size,
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off_t offset)
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{
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Link *link;
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link = path_to_Link(path);
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if (!link) {
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return -ENOENT;
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}
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size_t start = offset;
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size_t end = start + size;
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char range_str[64];
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snprintf(range_str, sizeof(range_str), "%lu-%lu", start, end);
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MemoryStruct buf;
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buf.size = 0;
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buf.memory = NULL;
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fprintf(stderr, "path_download(%s, %s);\n",
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path, range_str);
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CURL *curl = Link_to_curl(link);
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *)&buf);
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curl_easy_setopt(curl, CURLOPT_RANGE, range_str);
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transfer_blocking(curl);
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long http_resp;
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curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_resp);
|
|
|
|
if ( !(
|
|
|
|
(http_resp != HTTP_OK) ||
|
|
|
|
(http_resp != HTTP_PARTIAL_CONTENT) ||
|
|
|
|
(http_resp != HTTP_RANGE_NOT_SATISFIABLE)
|
|
|
|
)) {
|
|
|
|
fprintf(stderr, "path_download(): Could not download %s, HTTP %ld\n",
|
|
|
|
link->f_url, http_resp);
|
|
|
|
return -ENOENT;
|
|
|
|
}
|
|
|
|
|
|
|
|
double dl;
|
|
|
|
curl_easy_getinfo(curl, CURLINFO_SIZE_DOWNLOAD, &dl);
|
|
|
|
|
|
|
|
size_t recv = dl;
|
|
|
|
if (recv > size) {
|
|
|
|
recv = size;
|
|
|
|
}
|
|
|
|
|
|
|
|
memmove(output_buf, buf.memory, recv);
|
|
|
|
curl_easy_cleanup(curl);
|
|
|
|
free(buf.memory);
|
|
|
|
return recv;
|
|
|
|
}
|
|
|
|
|
|
|
|
static LinkType p_url_type(const char *p_url)
|
|
|
|
{
|
|
|
|
/* The link name has to start with alphanumerical character */
|
|
|
|
if (!isalnum(p_url[0])) {
|
|
|
|
return LINK_INVALID;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* check for http:// and https:// */
|
|
|
|
if ( !strncmp(p_url, "http://", 7) || !strncmp(p_url, "https://", 8) ) {
|
|
|
|
return LINK_INVALID;
|
|
|
|
}
|
|
|
|
|
|
|
|
if ( p_url[strlen(p_url) - 1] == '/' ) {
|
|
|
|
return LINK_DIR;
|
|
|
|
}
|
|
|
|
|
|
|
|
return LINK_FILE;
|
|
|
|
}
|
|
|
|
|
|
|
|
static char *url_append(const char *url, const char *sublink)
|
|
|
|
{
|
|
|
|
int needs_separator = 0;
|
|
|
|
if (url[strlen(url)-1] != '/') {
|
|
|
|
needs_separator = 1;
|
|
|
|
}
|
|
|
|
|
|
|
|
char *str;
|
|
|
|
size_t ul = strlen(url);
|
|
|
|
size_t sl = strlen(sublink);
|
|
|
|
str = calloc(ul + sl + needs_separator + 1, sizeof(char));
|
|
|
|
if (!str) {
|
|
|
|
fprintf(stderr, "url_append(): calloc failure!\n");
|
|
|
|
exit(EXIT_FAILURE);
|
|
|
|
}
|
|
|
|
strncpy(str, url, ul);
|
|
|
|
if (needs_separator) {
|
|
|
|
str[ul] = '/';
|
|
|
|
}
|
|
|
|
strncat(str, sublink, sl);
|
|
|
|
return str;
|
|
|
|
}
|