initial commit

.gitignore

@@ -0,0 +1 @@
+*.out

Makefile

@@ -0,0 +1,11 @@
+CC = gcc
+CFLAGS = -O0
+SRC = *.c
+
+all: $(patsubst %.c, %.out, $(wildcard *.c))
+
+%.out: %.c Makefile
+	$(CC) $(CFLAGS) $< -o $@
+
+clean:
+	rm *.out

httpreq.c

@@ -0,0 +1,58 @@
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+// TODO: fix over buf overflow
+void fillHttpReq(char *buf, char *host, size_t size) {
+    char *req = "GET / HTTP/1.1\r\nHost: \0";
+    memcpy(buf, req, strlen(req));
+    memcpy(buf + strlen(buf), host, strlen(host));
+    memcpy(buf + strlen(buf), "\r\n\r\n", strlen("\r\n\r\n"));
+}
+
+int main(int argc, char **argv) {
+    int status;
+    struct addrinfo hints;
+    struct addrinfo *servinfo;
+
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <hostname>", argv[0]);
+        exit(1);
+    }
+
+    memset(&hints, 0, sizeof hints);
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+
+    if ((status = getaddrinfo(argv[1], "80", &hints, &servinfo)) != 0) {
+        fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));
+        exit(1);
+    }
+
+    int s = socket(servinfo->ai_family, servinfo->ai_socktype,
+                   servinfo->ai_protocol);
+    printf("%d\n", s);
+
+    int connection;
+    if ((connection = connect(s, servinfo->ai_addr, servinfo->ai_addrlen)) ==
+        -1) {
+        fprintf(stderr, "connection error: %d\n", connection);
+        exit(1);
+    }
+
+    char buf[10000];
+    fillHttpReq(buf, argv[1], 10000);
+    printf("%s\n", buf);
+    // TODO: send throw a loop
+    send(s, buf, 10000, 0);
+    memset(buf, 0, 10000);
+    recv(s, buf, 10000, 0);
+    printf("%s\n", buf);
+    close(s);
+    freeaddrinfo(servinfo);
+}

server.c

@@ -0,0 +1,72 @@
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#define BACKLOG 10
+
+int main(int argc, char **argv) {
+    int status;
+    struct addrinfo hints;
+    struct addrinfo *servinfo;
+    struct sockaddr_storage their_addr;
+    socklen_t addr_size;
+
+    memset(&hints, 0, sizeof hints);
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+    hints.ai_flags = AI_PASSIVE;
+
+    if ((status = getaddrinfo(NULL, "3490", &hints, &servinfo)) != 0) {
+        fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));
+        exit(1);
+    }
+
+    int s;
+    if ((s = socket(servinfo->ai_family, servinfo->ai_socktype, servinfo->ai_protocol)) == -1) {
+        fprintf(stderr, "socket error: %d\n", status);
+        exit(1);
+    }
+
+    printf("%d\n", s);
+    int yes=1;
+
+    if ((status = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof yes)) == -1) {
+        fprintf(stderr, "setsockopt error: %d\n", status);
+        exit(1);
+    } 
+
+    if((status = bind(s, servinfo->ai_addr, servinfo->ai_addrlen)) == -1) {
+        fprintf(stderr, "bind error: %d\n", status);
+        exit(1);
+    }
+
+    listen(s, BACKLOG);
+
+    addr_size = sizeof their_addr;
+    int new_fd = accept(s, (struct sockaddr *)&their_addr, &addr_size);
+    printf("%d\n", new_fd);
+
+    int t = 10;
+    char c;
+    while (t--) {
+        char *msg = "Hi mom!\0";
+        int len = strlen(msg), bytes_sent;
+        if ((bytes_sent = send(new_fd, msg, len, 0)) == -1) {
+            fprintf(stderr, "send error: %d\n", status);
+            exit(1);
+        }
+    }
+    char *msg = "Ja!\0";
+    int len = strlen(msg), bytes_sent;
+    if ((bytes_sent = send(new_fd, msg, len, 0)) == -1) {
+        fprintf(stderr, "send error: %d\n", status);
+        exit(1);
+    }
+    
+
+    freeaddrinfo(servinfo);
+}

showip.c

@@ -0,0 +1,53 @@
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+int main(int argc, char **argv) {
+    if (argc != 2) {
+        fprintf(stderr, "Usage: %s <hostname>", argv[0]);
+        exit(1);
+    }
+
+    int status;
+    struct addrinfo hints;
+    memset(&hints, 0, sizeof hints);
+
+    struct addrinfo *servinfo;
+
+    hints.ai_family = AF_UNSPEC;
+    hints.ai_socktype = SOCK_STREAM;
+
+    if ((status = getaddrinfo(argv[1], "80", &hints, &servinfo)) != 0) {
+        fprintf(stderr, "getaddrinfo error: %s\n", gai_strerror(status));
+        exit(1);
+    }
+
+    struct addrinfo *cur = servinfo;
+    while (cur) {
+        void *addr;
+        char *ipver;
+        char ipstr[INET6_ADDRSTRLEN];
+
+
+        if (cur->ai_family == AF_INET) {
+            struct sockaddr_in *temp = (struct sockaddr_in *)cur->ai_addr;
+            addr = &(temp->sin_addr);
+            ipver = "IPv4";
+        } else if (cur->ai_family == AF_INET6) {
+            struct sockaddr_in6 *temp = (struct sockaddr_in6 *)cur->ai_addr;
+            addr = &(temp->sin6_addr);
+            ipver = "IPv6";
+        }
+
+        inet_ntop(cur->ai_family, addr, ipstr, sizeof ipstr);
+        printf("%s: %s\n", ipver, ipstr);
+
+        cur = cur->ai_next;
+    }
+
+    freeaddrinfo(servinfo);
+}