surinoel · July 27, 2019 15:50
diff --git a/control.html b/control.html
 <html>
 <head>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
    <title>Raspberry Pi Contorller</title>
 </head>
 <body>
    <form action="control.html" method="GET" onSubmit="document.reload()">
        <table>
            <tr>
                <td>LED</td>
                <td><input type="radio" name="led" value="On"/>On</td>
                <td><input type="radio" name="led" value="Off"/>Off</td>
            </tr>
            <tr>
                <td>Submit</td>
                <td><input type="submit" value="Submit"/></td>
            </tr>
        </table>
    </form>
 </body>
 </html>
diff --git a/webpi.c b/webpi.c
 #include <time.h>
 #include <stdio.h>
 #include <fcntl.h>
 #include <string.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <pthread.h>
 #include <sys/stat.h>
 #include <wiringPi.h>
 #include <arpa/inet.h>
 #include <sys/types.h>
 #include <sys/socket.h>

 // wiringPi에서 GPIO 18번이 1번이다
 #define LED 1

 static void *clnt_connection(void *arg);
 int sendData(int fd, FILE *fp, char *file_name);
 void sendOk(FILE *fp);
 void sendError(FILE *fp);

 void ledControl(int gpio, int state)
 {
    digitalWrite(gpio, state);
 }

 int main(int argc, char **argv)
 {
    int serv_sock;
    pthread_t tid;
    struct sockaddr_in serv_addr, clnt_addr;
    socklen_t clnt_addr_size;

    if(argc != 2) {
        printf("usage : %s <PORT>\n", argv[0]);
        return -1;
    }
    
    wiringPiSetup();
    pinMode(1, OUTPUT);
    
    serv_sock = socket(AF_INET, SOCK_STREAM, 0);
    if(serv_sock < 0) {
        perror("socket");
        return -1;
    }
    
    memset(&serv_addr, 0, sizeof(serv_addr));
    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(atoi(argv[1]));
    if(bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
        perror("bind");
        return -1;
    }

    if(listen(serv_sock, 10) < 0) {
        perror("listen");
        return -1;
    }

    while(1) {
        int clnt_sock;
        clnt_addr_size = sizeof(clnt_addr);
        clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_addr, &clnt_addr_size);
        printf("Client IP : %s:%d\n", inet_ntoa(clnt_addr.sin_addr), ntohs(clnt_addr.sin_port));

        pthread_create(&tid, NULL, clnt_connection, (void *)&clnt_sock);
        pthread_detach(tid);
    }

    return 0;
 }

 void *clnt_connection(void *arg)
 {
    int clnt_sock = *((int *)arg), clnt_fd;
    FILE *clnt_read, *clnt_write;
    
    char reg_line[BUFSIZ], reg_buf[BUFSIZ];
    char method[10];
    char file_name[256];
    
    clnt_read = fdopen(clnt_sock, "r");
    clnt_write = fdopen(dup(clnt_sock), "w");
    clnt_fd = clnt_sock;

    fgets(reg_line, BUFSIZ, clnt_read);
    fputs(reg_line, stdout);

    strcpy(method, strtok(reg_line, " /"));
    if(strcmp(method, "POST") == 0) {
        sendOk(clnt_write);
        fclose(clnt_read);
        fclose(clnt_write);
        return NULL;
    }
    else if(strcmp(method, "GET") != 0) {
        sendError(clnt_write);
        fclose(clnt_read);
        fclose(clnt_write);
        return NULL;
    }
    
    strcpy(file_name, strtok(NULL, " /"));
    printf("file_name : %s\n", file_name);
    if(strstr(file_name, "?") != NULL) {
        // LED 버튼을 누르고 submit을 했다면 ?led=On 혹은 ?led=Off라고 발송된다
        char opt[8], var[8];
        strtok(file_name, "?");
        // led와 On/Off 분리
        strcpy(opt, strtok(NULL, "="));
        strcpy(var, strtok(NULL, "="));
        
        printf("%s=%s\n", opt, var);
        if(!strcmp(opt, "led") && !strcmp(var, "On")) {
            ledControl(LED, 1);
        } else if(!strcmp(opt, "led") && !strcmp(var, "Off")) {
            ledControl(LED, 0);   
        }
    }
    
    // 웹 페이지 
    do {
        fgets(reg_line, BUFSIZ, clnt_read);
        fputs(reg_line, stdout);
        strcpy(reg_buf, reg_line);
    } while(strncmp(reg_line, "\r\n", 2));
    
    sendData(clnt_fd, clnt_write, file_name);
    
    fclose(clnt_read);
    fclose(clnt_write);
    return NULL;
 }

 int sendData(int fd, FILE *fp, char *file_name)
 {
    char protocol[] = "HTTP/1.1 200 OK\r\n";
    char server[] = "Server:Netscape-Enterprise\6.0\r\n";
    char cnt_type[] = "Content-Type:text/html\r\n";
    char end[] = "\r\n";
    char buf[BUFSIZ];
    int len;

    fputs(protocol, fp);
    fputs(server, fp);
    fputs(cnt_type, fp);
    fputs(end, fp);
    fflush(fp);

    fd = open(file_name, O_RDWR);
    do {
        len = read(fd, buf, BUFSIZ);
        fwrite(buf, len, sizeof(char), fp);
    } while(len == BUFSIZ);

    fflush(fp);
    close(fd);

    return 0;
 }

 void sendOk(FILE *fp)
 {
    char protocol[] = "HTTP/1.1 200 OK\r\n";
    char server[] = "Server: Netscape-Enterprise/6.0\r\n\r\n";

    fputs(protocol, fp);
    fputs(server, fp);
    fflush(fp);
 }

 void sendError(FILE *fp)
 {
    char protocol[] = "HTTP/1.1 200 OK\r\n";
    char server[] = "Server:Netscape-Enterprise\6.0\r\n";
    char cnt_len[] = "Content-Length:1024\r\n";
    char cnt_type[] = "Content-Type:text/html\r\n";
    char content1[] = "<html><head><title>BAD Connection</title></head>";
    char content2[] = "<body><font size=+5>BAD Request</font></body></html>";

    printf("send_error\n");
    fputs(protocol, fp);
    fputs(server, fp);
    fputs(cnt_len, fp);
    fputs(cnt_type, fp);
    fputs(content1, fp);
    fputs(content2, fp);

    fflush(fp);
 }
	<html>
	<head>
	<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
	<title>Raspberry Pi Contorller</title>
	</head>
	<body>
	<form action="control.html" method="GET" onSubmit="document.reload()">
	<table>
	<tr>
	<td>LED</td>
	<td><input type="radio" name="led" value="On"/>On</td>
	<td><input type="radio" name="led" value="Off"/>Off</td>
	</tr>
	<tr>
	<td>Submit</td>
	<td><input type="submit" value="Submit"/></td>
	</tr>
	</table>
	</form>
	</body>
	</html>
	#include <time.h>
	#include <stdio.h>
	#include <fcntl.h>
	#include <string.h>
	#include <stdlib.h>
	#include <unistd.h>
	#include <pthread.h>
	#include <sys/stat.h>
	#include <wiringPi.h>
	#include <arpa/inet.h>
	#include <sys/types.h>
	#include <sys/socket.h>

	// wiringPi에서 GPIO 18번이 1번이다
	#define LED 1

	static void clnt_connection(void arg);
	int sendData(int fd, FILE fp, char file_name);
	void sendOk(FILE *fp);
	void sendError(FILE *fp);

	void ledControl(int gpio, int state)
	{
	digitalWrite(gpio, state);
	}

	int main(int argc, char **argv)
	{
	int serv_sock;
	pthread_t tid;
	struct sockaddr_in serv_addr, clnt_addr;
	socklen_t clnt_addr_size;

	if(argc != 2) {
	printf("usage : %s <PORT>\n", argv[0]);
	return -1;
	}

	wiringPiSetup();
	pinMode(1, OUTPUT);

	serv_sock = socket(AF_INET, SOCK_STREAM, 0);
	if(serv_sock < 0) {
	perror("socket");
	return -1;
	}

	memset(&serv_addr, 0, sizeof(serv_addr));
	serv_addr.sin_family = AF_INET;
	serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	serv_addr.sin_port = htons(atoi(argv[1]));
	if(bind(serv_sock, (struct sockaddr *)&serv_addr, sizeof(serv_addr)) < 0) {
	perror("bind");
	return -1;
	}

	if(listen(serv_sock, 10) < 0) {
	perror("listen");
	return -1;
	}

	while(1) {
	int clnt_sock;
	clnt_addr_size = sizeof(clnt_addr);
	clnt_sock = accept(serv_sock, (struct sockaddr *)&clnt_addr, &clnt_addr_size);
	printf("Client IP : %s:%d\n", inet_ntoa(clnt_addr.sin_addr), ntohs(clnt_addr.sin_port));

	pthread_create(&tid, NULL, clnt_connection, (void *)&clnt_sock);
	pthread_detach(tid);
	}

	return 0;
	}

	void clnt_connection(void arg)
	{
	int clnt_sock = ((int )arg), clnt_fd;
	FILE clnt_read, clnt_write;

	char reg_line[BUFSIZ], reg_buf[BUFSIZ];
	char method[10];
	char file_name[256];

	clnt_read = fdopen(clnt_sock, "r");
	clnt_write = fdopen(dup(clnt_sock), "w");
	clnt_fd = clnt_sock;

	fgets(reg_line, BUFSIZ, clnt_read);
	fputs(reg_line, stdout);

	strcpy(method, strtok(reg_line, " /"));
	if(strcmp(method, "POST") == 0) {
	sendOk(clnt_write);
	fclose(clnt_read);
	fclose(clnt_write);
	return NULL;
	}
	else if(strcmp(method, "GET") != 0) {
	sendError(clnt_write);
	fclose(clnt_read);
	fclose(clnt_write);
	return NULL;
	}

	strcpy(file_name, strtok(NULL, " /"));
	printf("file_name : %s\n", file_name);
	if(strstr(file_name, "?") != NULL) {
	// LED 버튼을 누르고 submit을 했다면 ?led=On 혹은 ?led=Off라고 발송된다
	char opt[8], var[8];
	strtok(file_name, "?");
	// led와 On/Off 분리
	strcpy(opt, strtok(NULL, "="));
	strcpy(var, strtok(NULL, "="));

	printf("%s=%s\n", opt, var);
	if(!strcmp(opt, "led") && !strcmp(var, "On")) {
	ledControl(LED, 1);
	} else if(!strcmp(opt, "led") && !strcmp(var, "Off")) {
	ledControl(LED, 0);
	}
	}

	// 웹 페이지
	do {
	fgets(reg_line, BUFSIZ, clnt_read);
	fputs(reg_line, stdout);
	strcpy(reg_buf, reg_line);
	} while(strncmp(reg_line, "\r\n", 2));

	sendData(clnt_fd, clnt_write, file_name);

	fclose(clnt_read);
	fclose(clnt_write);
	return NULL;
	}

	int sendData(int fd, FILE fp, char file_name)
	{
	char protocol[] = "HTTP/1.1 200 OK\r\n";
	char server[] = "Server:Netscape-Enterprise\6.0\r\n";
	char cnt_type[] = "Content-Type:text/html\r\n";
	char end[] = "\r\n";
	char buf[BUFSIZ];
	int len;

	fputs(protocol, fp);
	fputs(server, fp);
	fputs(cnt_type, fp);
	fputs(end, fp);
	fflush(fp);

	fd = open(file_name, O_RDWR);
	do {
	len = read(fd, buf, BUFSIZ);
	fwrite(buf, len, sizeof(char), fp);
	} while(len == BUFSIZ);

	fflush(fp);
	close(fd);

	return 0;
	}

	void sendOk(FILE *fp)
	{
	char protocol[] = "HTTP/1.1 200 OK\r\n";
	char server[] = "Server: Netscape-Enterprise/6.0\r\n\r\n";

	fputs(protocol, fp);
	fputs(server, fp);
	fflush(fp);
	}

	void sendError(FILE *fp)
	{
	char protocol[] = "HTTP/1.1 200 OK\r\n";
	char server[] = "Server:Netscape-Enterprise\6.0\r\n";
	char cnt_len[] = "Content-Length:1024\r\n";
	char cnt_type[] = "Content-Type:text/html\r\n";
	char content1[] = "<html><head><title>BAD Connection</title></head>";
	char content2[] = "<body><font size=+5>BAD Request</font></body></html>";

	printf("send_error\n");
	fputs(protocol, fp);
	fputs(server, fp);
	fputs(cnt_len, fp);
	fputs(cnt_type, fp);
	fputs(content1, fp);
	fputs(content2, fp);

	fflush(fp);
	}