NatanR-dev/Dockerfile

## Dockerfile
# Usar imagem base com GCC pré-instalado
FROM n0madic/alpine-gcc:9.2.0

# Criar diretório de trabalho
WORKDIR /app

# Copiar o código-fonte para o container
COPY . .

# Compilar o programa
RUN gcc -o server webserver.c

# Comando padrão para executar o servidor
CMD ["./server"]

## webserver.c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>

#define PORT 8080//porta
#define BUFFER_SIZE 1024//tamanho buffer

int main() {
    int socketTCP, clientSocket;//ouvir, conectar
    struct sockaddr_in serverAddress;//endereço
    socklen_t serverAddressLength = sizeof(serverAddress);
    char buffer[BUFFER_SIZE] = {0};//buffer leitura

    const char* htmlBody =//saída html
        "<html><head><title>SIM!</title></head>"
        "<body><h1>Hello World!</h1><p>RECEBA!.</p></body></html>";

    char httpResponse[BUFFER_SIZE];//resposta HTTP
    snprintf(httpResponse, sizeof(httpResponse),
        "HTTP/1.1 200 OK\r\n"
        "Content-Type: text/html\r\n"
        "Content-Length: %d\r\n\r\n%s",
        (int)strlen(htmlBody), htmlBody);

    const char* jsonBody = "{\"message\": \"Receba!!\", \"status\": \"success\"}";
    snprintf(httpResponse, sizeof(httpResponse),
        "HTTP/1.1 200 OK\r\n"
        "Content-Type: application/json\r\n"
        "Content-Length: %d\r\n\r\n%s",
        (int)strlen(jsonBody), jsonBody);

    int socketOption = 1;//reuso-socket
    socketTCP = socket(AF_INET, SOCK_STREAM, 0);//cria socket
    setsockopt(socketTCP, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT,
               &socketOption, sizeof(socketOption));//ativa reuso

    serverAddress.sin_family = AF_INET;//IPv4
    serverAddress.sin_addr.s_addr = INADDR_ANY;//qualquer interface
    serverAddress.sin_port = htons(PORT);//porta

    bind(socketTCP, (struct sockaddr*)&serverAddress, sizeof(serverAddress));// vincula
    listen(socketTCP, 3);//escuta (fila 3)

    printf("WebServer started on localhost. listening on port: %d\n", PORT);

    while (1) {
        clientSocket = accept(socketTCP, (struct sockaddr*)&serverAddress, &serverAddressLength); // aceita
        read(clientSocket, buffer, sizeof(buffer));// lê
        write(clientSocket, httpResponse, strlen(httpResponse));// escreve
        close(clientSocket);//fecha conexão
    }

    close(socketTCP);//fecha socket
    printf("Webserver stopped.\n");
    return 0;
}
	# Usar imagem base com GCC pré-instalado
	FROM n0madic/alpine-gcc:9.2.0

	# Criar diretório de trabalho
	WORKDIR /app

	# Copiar o código-fonte para o container
	COPY . .

	# Compilar o programa
	RUN gcc -o server webserver.c

	# Comando padrão para executar o servidor
	CMD ["./server"]
	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <unistd.h>
	#include <arpa/inet.h>

	#define PORT 8080//porta
	#define BUFFER_SIZE 1024//tamanho buffer

	int main() {
	int socketTCP, clientSocket;//ouvir, conectar
	struct sockaddr_in serverAddress;//endereço
	socklen_t serverAddressLength = sizeof(serverAddress);
	char buffer[BUFFER_SIZE] = {0};//buffer leitura

	const char* htmlBody =//saída html
	"<html><head><title>SIM!</title></head>"
	"<body><h1>Hello World!</h1><p>RECEBA!.</p></body></html>";

	char httpResponse[BUFFER_SIZE];//resposta HTTP
	snprintf(httpResponse, sizeof(httpResponse),
	"HTTP/1.1 200 OK\r\n"
	"Content-Type: text/html\r\n"
	"Content-Length: %d\r\n\r\n%s",
	(int)strlen(htmlBody), htmlBody);

	const char* jsonBody = "{\"message\": \"Receba!!\", \"status\": \"success\"}";
	snprintf(httpResponse, sizeof(httpResponse),
	"HTTP/1.1 200 OK\r\n"
	"Content-Type: application/json\r\n"
	"Content-Length: %d\r\n\r\n%s",
	(int)strlen(jsonBody), jsonBody);

	int socketOption = 1;//reuso-socket
	socketTCP = socket(AF_INET, SOCK_STREAM, 0);//cria socket
	setsockopt(socketTCP, SOL_SOCKET, SO_REUSEADDR \| SO_REUSEPORT,
	&socketOption, sizeof(socketOption));//ativa reuso

	serverAddress.sin_family = AF_INET;//IPv4
	serverAddress.sin_addr.s_addr = INADDR_ANY;//qualquer interface
	serverAddress.sin_port = htons(PORT);//porta

	bind(socketTCP, (struct sockaddr*)&serverAddress, sizeof(serverAddress));// vincula
	listen(socketTCP, 3);//escuta (fila 3)

	printf("WebServer started on localhost. listening on port: %d\n", PORT);

	while (1) {
	clientSocket = accept(socketTCP, (struct sockaddr*)&serverAddress, &serverAddressLength); // aceita
	read(clientSocket, buffer, sizeof(buffer));// lê
	write(clientSocket, httpResponse, strlen(httpResponse));// escreve
	close(clientSocket);//fecha conexão
	}

	close(socketTCP);//fecha socket
	printf("Webserver stopped.\n");
	return 0;
	}