Initial commit

client.c

@@ -0,0 +1,61 @@
+
+#include "config.h"
+#include "die.h"
+
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <sys/socket.h>
+#include <unistd.h>
+
+static inline int eval(unsigned char* code)
+{
+    long size = sysconf(_SC_PAGESIZE);
+    void* start = (void *)((unsigned long)code & ~(size - 1));
+    int ok = mprotect(start, size, PROT_READ | PROT_WRITE | PROT_EXEC);
+    if (ok == -1) die("mprotect");;
+
+    return ((int(*)())code)();
+}
+
+int main(int argc, char** argv)
+{
+    struct sockaddr_in serv_addr;
+    unsigned char buffer[BUF_SIZE] = {0};
+    int ok;
+    char *request = "GET / HTTP/1.1"  LINEBREAK
+                    "Host: localhost" LINEBREAK LINEBREAK;
+
+    int sock = socket(AF_INET, SOCK_STREAM, 0);
+    if (sock == -1) die("socket");
+
+    serv_addr.sin_family = AF_INET;
+    serv_addr.sin_port   = htons(argc == 3 ? atoi(argv[2]) : PORT);
+
+    ok = inet_pton(AF_INET, argc > 1 ? argv[1] : "127.0.0.1", &serv_addr.sin_addr);
+    if (ok == -1) die("inet_pton");
+
+    ok = connect(sock, (struct sockaddr *)&serv_addr, sizeof serv_addr);
+    if (ok == -1) die("connect");
+
+    ok = send(sock, request, strlen(request), 0);
+    if (ok == -1) die("send");
+
+    ssize_t read_cnt = read(sock, buffer, BUF_SIZE);
+    if (read_cnt == -1) die("read");
+
+    ok = close(sock);
+    if (ok == -1) die("close");
+
+    for (ssize_t i=0; i<read_cnt; i++)
+        fprintf(stderr, "%02x ", buffer[i]);
+    fprintf(stderr, "\n");
+
+    eval(buffer);
+
+    return 0;
+}
+