Initial commit: created project structure, makefile, some static files for future server tests and interphase to create a listening socket

.gitignore

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+bin/
+obj/
+tmp/
+.vscode/

Makefile

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+CPPFLAGS := -Iinclude -MMD -MP
+CFLAGS   := -Wall
+LDFLAGS  := -Llib
+LDLIBS   := -lm
+
+SRC_DIR := src
+OBJ_DIR := obj
+BIN_DIR := bin
+
+EXE := $(BIN_DIR)/server
+
+SRC := $(wildcard $(SRC_DIR)/*.c)
+
+OBJ := $(SRC:$(SRC_DIR)/%.c=$(OBJ_DIR)/%.o)
+
+all: $(EXE)
+
+$(EXE): $(OBJ) | $(BIN_DIR)
+	$(CC) $(LDFLAGS) $^ $(LDLIBS) -o $@
+
+$(OBJ_DIR)/%.o: $(SRC_DIR)/%.c | $(OBJ_DIR)
+	$(CC) $(CPPFLAGS) $(CFLAGS) -c $< -o $@
+
+$(BIN_DIR) $(OBJ_DIR):
+	mkdir -p $@
+
+clean: 
+	@$(RM) -rv $(BIN_DIR) $(OBJ_DIR)
+
+-include $(OBJ:.o=.d)
+
+.PHONY: all, clean

include/netw.h

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+int get_listener_socket(char *port);
+void *get_in_addr(struct sockaddr *sa);

include/utils.h

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+void err_msg(char *msg);

readme.txt

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+Webserver in c. !Experimental!

src/netw.c

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+#include <string.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include <netdb.h>
+
+#include "../include/utils.h"
+
+#define BACKLOG 10
+
+/**
+ * @brief Get the listener socket object
+ * 
+ * @param {char *} port 
+ * @return int 
+ */
+int get_listener_socket(char *port)
+{
+    int sockfd;
+    struct addrinfo hints, *servinfo, *p;
+    int yes = 1;
+
+    memset(&hints, 0, sizeof hints);
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE;
+
+    if (getaddrinfo(NULL, port, &hints, &servinfo) != 0)
+    {
+        err_msg("can't get addres info");
+        return -1;
+    }
+
+    for (p = servinfo; p != NULL; p = p->ai_next)
+    {
+        if ((sockfd = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) < 0)
+        {
+            err_msg("can't create socket");
+            continue;
+        }
+
+        if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes) < 0)
+        {
+            err_msg("can't set socket options");
+            close(sockfd);
+            freeaddrinfo(servinfo);
+            return -2;
+        }
+
+        if (bind(sockfd, p->ai_addr, p->ai_addrlen) < 0)
+        {
+            close(sockfd);
+            err_msg("can't bind socket");
+            continue;
+        }
+
+        break;
+    }
+
+    freeaddrinfo(servinfo);
+
+    if (p == NULL)
+    {
+        err_msg("failed to find local adress");
+        return -3;
+    }
+
+    if (listen(sockfd, BACKLOG) < 0)
+    {
+        err_msg("failed to listen");
+        return -4;
+    }
+
+    return sockfd;
+}
+
+void *get_in_addr(struct sockaddr *sa)
+{
+    if (sa->sa_family == AF_INET) {
+        return &(((struct sockaddr_in*)sa)->sin_addr);
+    }
+
+    return &(((struct sockaddr_in6*)sa)->sin6_addr);
+}

src/server.c

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+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <unistd.h> 
+#include <netdb.h>
+
+#include "../include/netw.h"
+#include "../include/utils.h"
+/**
+  * Main
+  */
+int main(int argc, char *argv[])
+{
+    int client_fd;
+    struct sockaddr_storage cli_addr;
+    char s[INET6_ADDRSTRLEN];
+
+    if (argc != 2)
+    {
+        err_msg("Usage: <Server Port>\n");
+        exit(1);
+    }
+    char *port = argv[1];
+
+    int listenfd = get_listener_socket(port);
+    if (listenfd < 0)
+    {
+        err_msg("!fatal! couldn't create listening socket");
+        exit(1);
+    }
+    printf("Waiting for connection on port %s...\n", port);
+
+    while (1)
+    {
+        socklen_t sin_size = sizeof cli_addr;
+
+        client_fd = accept(listenfd, (struct sockaddr *)&cli_addr, &sin_size);
+        if (client_fd < 0)
+        {
+            err_msg("couldn't accept client connection");
+            continue;
+        }
+        
+        // | Doesn't work properly yet
+        // v
+
+        int pid = fork();
+        
+        if (pid < 0)
+            err_msg("fork failed");
+        else if (pid == 0)
+        {
+            close(listenfd);
+        
+            inet_ntop(cli_addr.ss_family, get_in_addr((struct sockaddr *)&cli_addr), s, sizeof s);
+            printf("Got connection from %s\n", s);
+        
+            // connection(client_fd); // Implement
+            exit(0);
+        }
+        else
+            close(client_fd);
+    }
+
+    return 0;
+}

src/utils.c

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+#include <stdio.h>
+
+/** 
+ * @brief Prints error
+ * 
+ * @param {char *} msg
+*/
+void err_msg (char *msg) {
+    fprintf(stderr, "Error: %s\n", msg);
+}

static/404.html

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+<!DOCTYPE HTML PUBLIC \"-//IETF//DTD HTML 2.0//EN\">
+<html>
+
+<head>
+    <title>404 Not Found</title>
+</head>
+
+<body>
+    <h1>Not Found</h1>
+    <p>The requested URL was not found on this server.</p>
+</body>
+
+</html>

static/about/index.html

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+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>About</title>
+</head>
+
+<body>
+    <a href="../">Back</a>
+    <p>Me</p>
+    <img src="/about/me.jpg" alt="the pig" style="max-height: 200px;" />
+</body>
+
+</html>

static/index.html

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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Test</title>
+</head>
+<body>
+    <p>Testing paragraf</p>
+    <a href="./about">About me</a>
+</body>
+</html>