1 files changed, 109 insertions, 0 deletions
diff --git a/http.c b/http.c
new file mode 100644
index 0000000..f30fe53
--- /dev/null
+++ b/http.c
@@ -0,0 +1,109 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <strings.h>
+
+#define BUF_LEN 512
+#define PATH_LEN 256
+#define PORT "3456"
+#define BACKLOG 10
+
+int
+main(void){
+  struct sockaddr_storage client_addr;
+  socklen_t addr_size = sizeof client_addr;
+  struct addrinfo hints, *serv_info;
+  int sockfd, acpt_fd, yes = 1, err, recv_len, file_len;
+  char buf[BUF_LEN], method[16], path[PATH_LEN], *file_buf;
+  FILE *file;
+
+  memset(&hints, 0, sizeof hints);
+  hints.ai_family = AF_UNSPEC;
+  hints.ai_flags = AI_PASSIVE;
+  hints.ai_socktype = SOCK_STREAM;
+
+  if ((err = getaddrinfo(NULL, PORT, &hints, &serv_info)) != 0) {
+    fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(err));
+    return 1;
+  }
+  if ((sockfd = socket(serv_info->ai_family, serv_info->ai_socktype,
+        serv_info->ai_protocol)) < 0) {
+    perror("socket");
+    exit(1);
+  }
+  if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(int)) < 0) {
+    perror("setsockopt");
+    exit(1);
+  }
+  if (bind(sockfd, serv_info->ai_addr, serv_info->ai_addrlen) < 0) {
+    perror("bind");
+    exit(1);
+  }
+  freeaddrinfo(serv_info);
+
+  if (listen(sockfd, BACKLOG) < 0) {
+    perror("listen");
+    exit(1);
+  }
+
+  if ((acpt_fd =
+      accept(sockfd, (struct sockaddr *)&client_addr, &addr_size)) < 0) {
+    perror("accept");
+    exit(1);
+  }
+  chdir("./resources"); // folder where all files to send are
+
+  while (1) {
+    if ((recv_len = recv(acpt_fd, buf, BUF_LEN, 0)) < 0) {
+      perror("accept");
+      exit(1);
+    }
+    buf[recv_len] = '\0';
+
+    printf("got request: %s\n", buf);
+    sscanf(buf, "%s %s", method, path+1); //+1 as first char needs to be .
+    printf("method: %s\n", method);
+    if (strcmp(method, "GET") == 0) {
+      printf("requested: %s\n\n", path+1);
+      if (path[1] == '\0') {
+        printf("got empty request\n");
+        continue;
+      }
+      path[0] = '.';
+
+      if ((file = fopen(path, "r")) == NULL) {
+        printf("opening \"%s\" didn't work (file nonexistent?)\n\n", path);
+        continue;
+      }
+      fseek(file, 0, SEEK_END);
+      file_len = ftell(file);
+      rewind(file);
+
+      file_buf = malloc(file_len);
+      fread(file_buf, file_len, 1, file);
+      fclose(file);
+      file_buf[file_len] = '\0';
+
+      if (send(acpt_fd, file_buf, file_len, 0) < 0) {
+        perror("send");
+        exit(1);
+      }
+
+      free(file_buf);
+      // prevent data leak by resetting path (a second, empty GET request will
+      // otherwise send previous file
+      path[0] = path[1] = '\0';
+    }
+    else
+      printf("invalid method\n");
+  }
+  close(acpt_fd);
+  close(sockfd);
+
+  return 0;
+}