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httpsget.c
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344 lines (290 loc) · 9.41 KB
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <errno.h>
#include <ctype.h>
#include "ssl.h"
#include "iconv/iconv_mini.h"
char request[65536];
char response[65536];
/*
* Shift_JISの文字かどうかを判定
*/
int is_sjis_lead_byte(unsigned char c) {
return ((c >= 0x81 && c <= 0x9F) || (c >= 0xE0 && c <= 0xFC));
}
/*
* ブロック要素のHTMLタグかどうかを判定
*/
int is_block_element(const char *tag_start) {
const char *block_tags[] = {
"<div", "<p", "<h1", "<h2", "<h3", "<h4", "<h5", "<h6",
"<ul", "<ol", "<li", "<dl", "<dt", "<dd",
"<table", "<tr", "<td", "<th", "<thead", "<tbody", "<tfoot",
"<article", "<section", "<header", "<footer", "<nav", "<aside",
"<blockquote", "<pre", "<address", "<hr", "<br",
"</div>", "</p>", "</h1>", "</h2>", "</h3>", "</h4>", "</h5>", "</h6>",
"</ul>", "</ol>", "</li>", "</dl>", "</dt>", "</dd>",
"</table>", "</tr>", "</td>", "</th>", "</thead>", "</tbody>", "</tfoot>",
"</article>", "</section>", "</header>", "</footer>", "</nav>", "</aside>",
"</blockquote>", "</pre>", "</address>", "</hr>", "</br>",
NULL
};
int i;
for (i = 0; block_tags[i] != NULL; i++) {
int len = strlen(block_tags[i]);
if (strncmp(tag_start, block_tags[i], len) == 0) {
return 1;
}
}
return 0;
}
/*
* 簡単なHTMLパース処理（Shift_JIS対応）
* HTMLタグを除去してプレーンテキストを抽出
*/
void parse_html(char *html_content) {
unsigned char *src = (unsigned char*)html_content;
unsigned char *dst = (unsigned char*)html_content;
int in_tag = 0;
int in_script = 0;
int in_style = 0;
int consecutive_spaces = 0;
unsigned char *tag_start = NULL;
while (*src) {
// Shift_JISの2バイト文字の処理
if (is_sjis_lead_byte(*src) && *(src + 1)) {
if (!in_tag && !in_script && !in_style) {
*dst++ = *src;
*dst++ = *(src + 1);
consecutive_spaces = 0;
}
src += 2;
continue;
}
// スクリプトタグの検出
if (!in_tag && strncmp((char*)src, "<script", 7) == 0) {
in_script = 1;
in_tag = 1;
tag_start = src;
src += 7;
continue;
} else if (in_script && strncmp((char*)src, "</script>", 9) == 0) {
in_script = 0;
in_tag = 0;
src += 9;
continue;
}
// スタイルタグの検出
if (!in_tag && strncmp((char*)src, "<style", 6) == 0) {
in_style = 1;
in_tag = 1;
tag_start = src;
src += 6;
continue;
} else if (in_style && strncmp((char*)src, "</style>", 8) == 0) {
in_style = 0;
in_tag = 0;
src += 8;
continue;
}
// タグの開始
if (*src == '<' && !in_script && !in_style) {
in_tag = 1;
tag_start = src;
}
// タグの終了
else if (*src == '>' && in_tag && !in_script && !in_style) {
in_tag = 0;
// ブロック要素の場合は改行を追加
if (tag_start && is_block_element((char*)tag_start)) {
// 直前が改行でない場合のみ改行を追加
if (dst > (unsigned char*)html_content && *(dst - 1) != '\n') {
*dst++ = '\n';
consecutive_spaces = 0;
}
}
src++;
continue;
}
// タグ内でない場合は文字をコピー
if (!in_tag && !in_script && !in_style) {
// HTMLエンティティの簡単な変換
if (strncmp((char*)src, "<", 4) == 0) {
*dst++ = '<';
src += 4;
consecutive_spaces = 0;
} else if (strncmp((char*)src, ">", 4) == 0) {
*dst++ = '>';
src += 4;
consecutive_spaces = 0;
} else if (strncmp((char*)src, "&", 5) == 0) {
*dst++ = '&';
src += 5;
consecutive_spaces = 0;
} else if (strncmp((char*)src, """, 6) == 0) {
*dst++ = '"';
src += 6;
consecutive_spaces = 0;
} else if (strncmp((char*)src, " ", 6) == 0) {
*dst++ = ' ';
src += 6;
consecutive_spaces = 1;
} else if (isspace(*src)) {
// 連続する空白文字を1つのスペースに変換
if (!consecutive_spaces) {
*dst++ = ' ';
consecutive_spaces = 1;
}
src++;
} else {
*dst++ = *src++;
consecutive_spaces = 0;
}
} else {
src++;
}
}
*dst = '\0';
}
/*
* HTTPレスポンスからヘッダーとボディを分離
*/
char* extract_html_body(char *response) {
char *body = strstr(response, "\r\n\r\n");
if (body) {
return body + 4;
}
body = strstr(response, "\n\n");
if (body) {
return body + 2;
}
return response;
}
/****************************************************************************/
int main(int argc, char **argv)
{
int client_fd;
struct sockaddr_in server_addr;
struct hostent *host_entry;
char *hostname = NULL;
char *path = NULL;
int port = 0;
int bytes_sent, bytes_received;
int total_received = 0;
int status_code;
int i;
// デフォルト値のリセット（オプション処理後）
hostname = "www.yahoo.co.jp";
path = "/";
port = 443;
if (argc >= 2) {
hostname = argv[1];
}
if (argc >= 3) {
path = argv[2];
}
printf("Connecting to %s:%d%s\n", hostname, port, path);
// ホスト名の解決
host_entry = gethostbyname(hostname);
if (host_entry == NULL) {
printf("gethostbyname() failed for %s\n", hostname);
return 1;
}
printf("Host resolved to: %s\n", inet_ntoa(*(struct in_addr*)host_entry->h_addr_list[0]));
// ソケットの作成
client_fd = socket(AF_INET, SOCK_STREAM, 0);
if (client_fd < 0) {
perror("socket() failed");
return 1;
}
printf("Socket created successfully\n");
// サーバーアドレスの設定
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(port);
memcpy(&server_addr.sin_addr, host_entry->h_addr_list[0], host_entry->h_length);
// サーバーに接続
if (connect(client_fd, (struct sockaddr*)&server_addr, sizeof(server_addr)) < 0) {
perror("connect() failed");
close(client_fd);
return 1;
}
printf("Connected to server successfully\n");
SSL_CTX *ssl_ctx = ssl_ctx_new(SSL_SERVER_VERIFY_LATER, SSL_DEFAULT_CLNT_SESS);
SSL_EXTENSIONS *ext = ssl_ext_new();
SSL *ssl_sock = ssl_client_new(ssl_ctx, client_fd, NULL, 0, ext);
int r = ssl_handshake_status(ssl_sock);
printf("Handshake status: %d\n", r);
// HTTP GETリクエストの作成
snprintf(request, sizeof(request),
"GET %s HTTP/1.0\r\n"
"Host: %s\r\n"
"User-Agent: X68000-HTTPS-Client/1.0\r\n"
"Accept: */*\r\n"
"Connection: close\r\n"
"\r\n",
path, hostname);
printf("Sending HTTP request:\n");
printf("--------------------\n");
printf("%s", request);
printf("--------------------\n\n");
// HTTPリクエストを送信
bytes_sent = ssl_write(ssl_sock, request, strlen(request));
if (bytes_sent < 0) {
perror("send() failed");
close(client_fd);
return 1;
}
printf("Sent %d bytes\n", bytes_sent);
printf("Receiving HTTP response...\n\n");
// HTTPレスポンスを受信してバッファに蓄積
memset(response, 0, sizeof(response));
total_received = 0;
uint8_t *buffer;
size_t buffer_size;
buffer = malloc(1);
*buffer = 0;
buffer_size = 1;
int res;
while (1) {
uint8_t *ptr;
res = ssl_read(ssl_sock, &ptr);
// printf("Received %d bytes\n\n", res);
if (res < 0) {
break;
}
if (res > 0) {
buffer_size += res;
buffer = realloc(buffer, buffer_size);
strcat(buffer, ptr);
}
}
ssl_free(ssl_sock);
ssl_ctx_free(ssl_ctx);
// printf("%s", buffer);
uint8_t *sbuffer = malloc(buffer_size);
uint8_t *inbuf = buffer;
size_t inbytesleft = buffer_size;
uint8_t *outbuf = sbuffer;
size_t outbytesleft = buffer_size;
do {
int res = iconv_u2s((char **)&inbuf, &inbytesleft, (char **)&outbuf, &outbytesleft);
if (res < 0) {
inbuf++;
inbytesleft--;
}
} while (inbuf < buffer + buffer_size);
*outbuf = 0;
char *html_body = extract_html_body((char *)sbuffer);
parse_html(html_body);
printf("%s", html_body);
free(buffer);
free(sbuffer);
return 0;
}