Created
February 6, 2015 15:30
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HTTPクライアント
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// httpclient.c | |
// HTTPクライアント | |
#include <stdio.h> | |
#include <string.h> | |
#include <stdlib.h> | |
#include <errno.h> | |
#include <sys/socket.h> | |
#include <netdb.h> | |
int main(int argc, char *argv[]) | |
{ | |
int ret; | |
int sock; | |
char *url; | |
char *port; | |
char *page; | |
char buf[BUFSIZ]; | |
char host[NI_MAXHOST]; | |
char serv[NI_MAXSERV]; | |
struct addrinfo hints; | |
struct addrinfo *res; | |
// 引数チェック | |
if (argc <= 3) { | |
printf("%s: no input [url] [port] [page]\n", argv[0]); | |
exit(EXIT_FAILURE); | |
} | |
// サーバのURLとPORT番号を引数から渡す | |
url = argv[1]; | |
port = argv[2]; | |
page = argv[3]; | |
memset(&hints, 0, sizeof(hints)); | |
hints.ai_socktype = SOCK_STREAM; | |
hints.ai_family = AF_INET; | |
// URL, PORT番号からソケットアドレス構造体を生成 | |
ret = getaddrinfo(url, port, &hints, &res); | |
if (ret != 0) { | |
printf("Error: getaddrinfo: %s\n", gai_strerror(ret)); | |
exit(EXIT_FAILURE); | |
} | |
// ソケットアドレス構造体からIPアドレスとPORT番号を求める | |
ret = getnameinfo(res->ai_addr, res->ai_addrlen, | |
host, sizeof(host), | |
serv, sizeof(serv), | |
NI_NUMERICHOST | NI_NUMERICSERV); | |
if (ret != 0) { | |
printf("Error: getnameinfo: %s\n", gai_strerror(ret)); | |
freeaddrinfo(res); | |
exit(EXIT_FAILURE); | |
} | |
printf("addr=%s\n", host); | |
printf("port=%s\n", serv); | |
// ソケットを生成 | |
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol); | |
if (sock == -1) { | |
printf("Error: socket() %s\n", strerror(errno)); | |
freeaddrinfo(res); | |
exit(EXIT_FAILURE); | |
} | |
// サーバに接続 | |
ret = connect(sock, res->ai_addr, res->ai_addrlen); | |
if (ret == -1) { | |
printf("Error: connect() %s\n", strerror(errno)); | |
freeaddrinfo(res); | |
close(sock); | |
exit(EXIT_FAILURE); | |
} | |
freeaddrinfo(res); | |
// サーバにメッセージを要求(リクエスト)を送信 | |
memset(buf, 0, sizeof(buf)); | |
snprintf(buf, sizeof(buf), "GET %s /HTTP/1.1\r\nHOST:%s\r\n\r\n", page, url); | |
printf("len=%d, buf=\n%s\n", (int)strlen(buf), buf); | |
ret = write(sock, buf, strlen(buf)); | |
if (ret == -1) { | |
printf("Error: write() %s\n", strerror(errno)); | |
close(sock); | |
exit(EXIT_FAILURE); | |
} | |
// サーバの応答(レスポンス)を表示 | |
while (ret > 0) { | |
memset(buf, 0, sizeof(buf)); | |
ret = read(sock, buf, sizeof(buf)); | |
if (ret == -1) { | |
printf("Error: read() %s\n", strerror(errno)); | |
exit(EXIT_FAILURE); | |
} | |
if (ret > 0) printf(buf); | |
} | |
printf("\n"); | |
close(sock); | |
exit(EXIT_SUCCESS); | |
} |
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# Makefile | |
httpclient: httpclient.c | |
gcc -o httpclient httpclient.c | |
clean: | |
rm -f httpclient |
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