From 064376146afad7af0b496014c59ba4b4f78d4c78 Mon Sep 17 00:00:00 2001
From: amelia squires <ameliasquires@disroot.org>
Date: Mon, 26 Aug 2024 12:41:30 -0500
Subject: sort networking code

---
 src/net/common.h |  64 +++++++++++++++
 src/net/lua.c    | 229 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/net/lua.h    |   8 ++
 src/net/luai.c   | 195 ++++++++++++++++++++++++++++++++++++++++++++
 src/net/luai.h   |  14 ++++
 src/net/util.c   | 241 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/net/util.h   |  47 +++++++++++
 7 files changed, 798 insertions(+)
 create mode 100644 src/net/common.h
 create mode 100644 src/net/lua.c
 create mode 100644 src/net/lua.h
 create mode 100644 src/net/luai.c
 create mode 100644 src/net/luai.h
 create mode 100644 src/net/util.c
 create mode 100644 src/net/util.h

(limited to 'src/net')

diff --git a/src/net/common.h b/src/net/common.h
new file mode 100644
index 0000000..04447f1
--- /dev/null
+++ b/src/net/common.h
@@ -0,0 +1,64 @@
+#ifndef __common_net_h
+#define __common_net_h
+
+#include "lua5.4/lauxlib.h"
+#include "lua5.4/lua.h"
+
+#include <sys/types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <errno.h>
+
+#include "../net.h"
+#include "../lua.h"
+#include "../io.h"
+#include "../table.h"
+#include "../types/str.h"
+#include "../types/parray.h"
+
+#define max_con 200
+//2^42
+#define BUFFER_SIZE 20000
+#define HTTP_BUFFER_SIZE 4098
+#define max_content_length 200000
+
+static int ports[65535] = { 0 };
+static parray_t* paths = NULL;
+
+enum file_status {
+  _ignore, BARRIER_READ, FILE_HEADER, FILE_BODY, NORMAL
+};
+
+struct file_parse {
+  enum file_status status;
+  str *current, *old, *boundary, *boundary_id;
+  int dash_count, table_idx;
+};
+
+typedef struct {
+  int fd;
+  int port;
+  lua_State* L;
+  struct sockaddr_in cli;
+} thread_arg_struct;
+
+struct lchar {
+  char* c;
+  int len;
+  char req[20];
+};
+
+struct sarray_t {
+  struct lchar** cs;
+  int len;
+};
+
+static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t con_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t lua_mutex = PTHREAD_MUTEX_INITIALIZER;
+
+#endif
diff --git a/src/net/lua.c b/src/net/lua.c
new file mode 100644
index 0000000..2995326
--- /dev/null
+++ b/src/net/lua.c
@@ -0,0 +1,229 @@
+#include "lua.h"
+#include "luai.h"
+#include "common.h"
+
+int l_write(lua_State* L){
+  int res_idx = 1;
+
+  lua_pushvalue(L, 1);
+  lua_pushstring(L, "_request");
+  lua_gettable(L, -2);
+
+  int head = strcmp(luaL_checkstring(L, -1), "HEAD") == 0;
+  
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "client_fd");
+  lua_gettable(L, res_idx);
+  int client_fd = luaL_checkinteger(L, -1);
+
+  client_fd_errors(client_fd);
+
+  size_t len;
+  char* content = (char*)luaL_checklstring(L, 2, &len);
+  
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "header");
+  lua_gettable(L, -2);
+  int header_top = lua_gettop(L);
+
+  lua_pushstring(L, "_sent");
+  lua_gettable(L, -2);
+  str* resp;
+  if(lua_isnil(L, -1)){
+    if(head) i_write_header(L, header_top, &resp, "", 0);
+    else i_write_header(L, header_top, &resp, content, len);
+
+    lua_pushvalue(L, header_top);
+    lua_pushstring(L, "_sent");
+    lua_pushinteger(L, 1);
+    lua_settable(L, -3);
+  } else {
+    if(head) return 0;
+    resp = str_init(content);
+  }
+
+  send(client_fd, resp->c, resp->len, 0);
+
+  str_free(resp);
+  return 0;
+}
+
+int l_send(lua_State* L){
+  int res_idx = 1;
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "client_fd");
+  lua_gettable(L, res_idx);
+  int client_fd = luaL_checkinteger(L, -1);
+  
+  client_fd_errors(client_fd);
+
+  size_t len;
+  char* content = (char*)luaL_checklstring(L, 2, &len);
+
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "header");
+  lua_gettable(L, -2);
+  int header = lua_gettop(L);
+
+  str* resp;
+  lua_pushvalue(L, 1);
+  lua_pushstring(L, "_request");
+  lua_gettable(L, -2);
+
+  if(strcmp(luaL_checkstring(L, -1), "HEAD") == 0){
+    i_write_header(L, header, &resp, "", 0);
+  } else 
+    i_write_header(L, header, &resp, content, len);
+
+  int a = send(client_fd, resp->c, resp->len, 0);
+  
+  //
+  lua_pushstring(L, "client_fd");
+  lua_pushinteger(L, -1);
+  lua_settable(L, res_idx);
+  closesocket(client_fd);
+  //printf("%i | %i\n'%s'\n%i\n",client_fd,a,resp->c,resp->len);
+  str_free(resp);
+  return 0;
+}
+
+int l_close(lua_State* L){
+  int res_idx = 1;
+  
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "client_fd");
+  lua_gettable(L, res_idx);
+  int client_fd = luaL_checkinteger(L, -1);
+  client_fd_errors(client_fd);
+
+  lua_pushstring(L, "client_fd");
+  lua_pushinteger(L, -1);
+  lua_settable(L, res_idx);
+  closesocket(client_fd);
+
+  return 0;
+}
+
+int l_roll(lua_State* L){
+  int alen;
+  if(lua_gettop(L) > 2) {
+    alen = luaL_checkinteger(L, 2);
+  } else {
+    alen = -1;
+  }
+
+  lua_pushvalue(L, 1);
+  lua_pushstring(L, "_bytes");
+  lua_gettable(L, 1);
+  int bytes = luaL_checkinteger(L, -1);
+
+  lua_pushstring(L, "Content-Length");
+  lua_gettable(L, 1);
+  if(lua_type(L, -1) == LUA_TNIL) {
+    lua_pushinteger(L, -1);
+    return 1;
+  }
+  int content_length = strtol(luaL_checkstring(L, -1), NULL, 10);
+  lua_pushstring(L, "_data");
+  lua_gettable(L, 1);
+  struct file_parse* data = (void*)lua_topointer(L, -1); 
+
+  lua_pushvalue(L, 1);
+  lua_pushstring(L, "client_fd");
+  lua_gettable(L, 1);
+  int client_fd = luaL_checkinteger(L, -1);
+  client_fd_errors(client_fd);
+  
+  fd_set rfd;
+  FD_ZERO(&rfd);
+  FD_SET(client_fd, &rfd);
+  //printf("* %li / %li\n", bytes, content_length);
+  if(bytes >= content_length){
+    lua_pushinteger(L, -1);
+    return 1;
+  }
+
+  if(select(client_fd+1, &rfd, NULL, NULL, &((struct timeval){.tv_sec = 0, .tv_usec = 0})) == 0){
+    lua_pushinteger(L, 0);
+    return 1;
+  }
+
+
+  //time_start(recv)
+  if(alen == -1) alen = content_length - bytes;
+  //printf("to read: %i\n", alen);
+  char* buffer = malloc(alen * sizeof * buffer);
+  int r = recv(client_fd, buffer, alen, 0);
+  if(r <= 0){
+    lua_pushinteger(L, r - 1);
+    return 1;
+  }
+  //time_end("recv", recv)
+
+  lua_pushstring(L, "_bytes");
+  lua_pushinteger(L, bytes + r);
+  lua_settable(L, 1);
+
+  lua_pushstring(L, "Body");
+  lua_gettable(L, 1);
+  int body_idx = lua_gettop(L);
+
+  lua_pushstring(L, "files");
+  lua_gettable(L, 1);
+  int files_idx = lua_gettop(L);
+  //time_start(parse)
+  rolling_file_parse(L, &files_idx, &body_idx, buffer, NULL, r, data);
+  //time_end("parse", parse)
+  luaI_tsetv(L, 1, "Body", body_idx);
+  luaI_tsetv(L, 1, "files", files_idx);
+
+  free(buffer);
+  lua_pushinteger(L, r);
+  return 1;
+}
+
+#define bsize 512
+int l_sendfile(lua_State* L){
+  int res_idx = 1;
+  
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "client_fd");
+  lua_gettable(L, res_idx);
+  int client_fd = luaL_checkinteger(L, -1);
+  client_fd_errors(client_fd);
+
+  lua_pushvalue(L, res_idx);
+  lua_pushstring(L, "header");
+  lua_gettable(L, -2);
+  int header = lua_gettop(L);
+
+  char* path = (char*)luaL_checkstring(L, 2);
+
+  if(access(path, F_OK)) {
+    p_fatal("file not found"); //TODO: use diff errors here
+  }
+  if(access(path, R_OK)){
+    p_fatal("missing permissions");
+  }
+
+  str* r;
+  i_write_header(L, header, &r, "", 0);
+  send(client_fd, r->c, r->len, 0);
+  str_free(r);
+
+  char* buffer = calloc(sizeof* buffer, bsize + 1);
+  FILE* fp = fopen(path, "rb");
+  fseek(fp, 0L, SEEK_END);
+  size_t sz = ftell(fp);
+  fseek(fp, 0L, SEEK_SET);
+
+  for(int i = 0; i < sz; i += bsize){
+    fread(buffer, sizeof * buffer, bsize, fp);
+    send(client_fd, buffer, bsize > sz - i ? sz - i : bsize, 0);
+  }
+
+  free(buffer);
+  fclose(fp);
+
+  return 0;
+}
diff --git a/src/net/lua.h b/src/net/lua.h
new file mode 100644
index 0000000..794e45f
--- /dev/null
+++ b/src/net/lua.h
@@ -0,0 +1,8 @@
+#include "common.h"
+
+int l_write(lua_State* L);
+int l_send(lua_State* L);
+int l_close(lua_State* L);
+int l_roll(lua_State* L);
+#define bsize 512
+int l_sendfile(lua_State* L);
diff --git a/src/net/luai.c b/src/net/luai.c
new file mode 100644
index 0000000..ea93285
--- /dev/null
+++ b/src/net/luai.c
@@ -0,0 +1,195 @@
+#include "luai.h"
+#include "common.h"
+
+void i_write_header(lua_State* L, int header_top, str** _resp, char* content, size_t len){
+  str* resp;
+  lua_pushvalue(L, header_top);
+
+  str* header_vs = str_init("");
+  lua_pushnil(L);
+    
+  for(;lua_next(L, header_top) != 0;){
+      char* key = (char*)luaL_checklstring(L, -2, NULL);
+      if(strcmp(key, "Code") != 0){
+        str_push(header_vs, key);
+        str_push(header_vs, ": ");
+        str_push(header_vs, (char*)luaL_checklstring(L, -1, NULL));
+        str_push(header_vs, "\r\n");
+      }
+      lua_pop(L, 1);
+  }
+
+  lua_pushvalue(L, header_top);
+  lua_pushstring(L, "Code");
+  lua_gettable(L, header_top);
+  int code = luaL_checkinteger(L, -1);
+    
+  char code_det[50] = {0};
+  http_code(code, code_det);
+  http_build(&resp, code,  code_det, header_vs->c, content, len);
+
+  str_free(header_vs);
+  *_resp = resp;
+}
+
+/**
+ * @brief parses all files in response buffer into a lua table
+ *
+ * @param {lua_State*} lua state to put table into
+ * @param {char*} response buffer
+ * @param {str*} response header Content-Type value
+ * @return {int} lua index of table
+*/
+int rolling_file_parse(lua_State* L, int* files_idx, int* body_idx, char* buffer, str* content_type, size_t blen, struct file_parse* _content){
+  struct file_parse content = *_content;
+  /*enum file_status* status = (enum file_status*)parray_get(content, "_status");
+  str* current = (str*)parray_get(content, "_current");
+  str* old = (str*)parray_get(content, "_old");
+  str* boundary = (str*)parray_get(content, "_boundary");
+  str* boundary_id = (str*)parray_get(content, "_boundary_id");
+  int* dash_count = (int*)parray_get(content, "_dash_count");
+  int* table_idx = (int*)parray_get(content, "_table_idx");*/
+  int override = 0;
+
+  //time_start(start)
+  if(content.status == _ignore){
+    content.boundary = str_init(""); //usually add + 2 to the length when using
+    int state = 0;
+    for(int i = 0; content_type->c[i] != '\0'; i++){
+      if(state == 2 && content_type->c[i] != '-') str_pushl(content.boundary, content_type->c + i, 1);
+      if(content_type->c[i] == ';') state = 1;
+      if(content_type->c[i] == '=' && state == 1) state = 2;
+    }
+    if(state == 2){
+      str_pushl(content.boundary, "\r\n\r\n", 4);
+    }
+
+    content.status = state==2?BARRIER_READ:NORMAL;//malloc(sizeof * status); content.status = state==2?BARRIER_READ:NORMAL;
+    content.dash_count = 0;//malloc(sizeof * dash_count); *dash_count = 0;
+    content.current = str_init("");
+
+    content.table_idx = lua_gettop(L);//malloc(sizeof * table_idx); *table_idx = lua_gettop(L);
+    //parray_set(content, "_table_idx", (void*)(table_idx));
+    //parray_set(content, "_status", (void*)(status));
+    //parray_set(content, "_dash_count", (void*)(dash_count));
+    //parray_set(content, "_current", (void*)(current));
+    
+    content.boundary_id = str_init("");
+    str_popb(content.boundary, 4);
+    //parray_set(content, "_boundary", (void*)boundary);
+    //parray_set(content, "_boundary_id", (void*)boundary_id);
+    
+  }
+  //time_end("start", start)
+  //printf("hi\n");
+  if(content.status == NORMAL){
+    //printf("normal\n");
+    //strnstr(buffer, )
+    //if(override) str_clear(current);
+    //str_pushl(current, buffer, blen);
+    //printf("%s\n",current->c);
+    lua_pushvalue(L, *body_idx);
+    lua_pushlstring(L, buffer, blen);
+    lua_concat(L, 2);
+    *body_idx = lua_gettop(L);
+  } else {
+  file_start:;
+    //time_start(barrier_read)
+    if(content.status == BARRIER_READ){
+      //printf("read %llu\n", blen);
+      for(int i = 0; i != blen; i++){
+        //printf("%c",buffer[i]);
+        //printf("\n");
+        if(*buffer == '\r'){
+          content.status = FILE_HEADER;
+          buffer+=2;
+          blen-=i+2;
+          
+          content.table_idx = lua_rawlen(L, *files_idx) + 1;
+          lua_pushinteger(L, content.table_idx);
+          lua_newtable(L);
+          lua_settable(L, *files_idx);
+          break;
+        }
+        str_pushl(content.boundary_id, buffer, 1);
+        buffer++;
+      }
+    }
+    //time_end("barrier_read", barrier_read)
+    lua_pushvalue(L, *files_idx);
+    lua_pushinteger(L, content.table_idx);
+    lua_gettable(L, -2);
+    int rfiles_idx = lua_gettop(L);
+    //time_start(file_header)
+    if(content.status == FILE_HEADER){
+      //printf("header\n");
+      for(int i = 0; i < blen; i++){
+
+        if(buffer[i] == ':'){
+          content.old = content.current;
+          content.current = str_init("");
+        } else if(buffer[i] == '\n'){
+          if(content.current->len == 0){
+            content.status = FILE_BODY;
+            buffer += i;
+            blen -= i;
+            content.old = NULL;
+            str_free(content.current);
+            content.current = str_init("");
+            break;
+          }
+          //printf("%i '%s' : '%s'\n",*table_idx, old->c, current->c);
+
+          luaI_tsets(L, rfiles_idx, content.old->c, content.current->c);
+          
+          str_free(content.old);
+          content.old = NULL;
+          str_clear(content.current);
+        } else if(buffer[i] != '\r' && !(buffer[i] == ' ' && content.current->len == 0)) str_pushl(content.current, buffer + i, 1);
+      }
+    } 
+    //time_end("file_header", file_header)
+    //time_start(file_body)
+    if(content.status == FILE_BODY){
+      //printf("body\n");
+      //if(content.old==NULL) content.old = str_init("");
+      char* barrier_end = strnstr(buffer, content.boundary->c, blen);
+      if(barrier_end == NULL){
+        str* temp = str_initl(content.current->c, content.current->len);
+        str_pushl(temp, buffer, blen);
+        barrier_end = strnstr(temp->c, content.boundary->c, temp->len);
+        if(barrier_end != NULL) abort(); // todo
+
+        str* temp2 = content.current;
+        content.current = temp;
+        str_free(temp2);
+
+      } else {
+        char* start = barrier_end, *end = barrier_end;
+        for(; *start != '\n'; start--);
+        for(; *end != '\n'; end++);
+        int clen = start - buffer;
+        str_pushl(content.current, buffer, clen);
+        luaI_tsetsl(L, rfiles_idx, "content", content.current->c, content.current->len);
+        str_clear(content.current);
+        blen-= end - buffer;
+        buffer = end;
+        content.status = BARRIER_READ;
+        goto file_start;
+        //printf("%s\n",content.current->c);
+      }
+      
+    }
+    //time_end("file_body", file_body)
+  }
+  /*parray_set(content, "_dash_count", dash_count);
+  parray_set(content, "_boundary_id", boundary_id);
+  parray_set(content, "_boundary", boundary);
+  parray_set(content, "_status", status);
+  parray_set(content, "_current", current);
+  parray_set(content, "_old", old);*/
+
+  *_content = content;
+
+  return 0;
+}
diff --git a/src/net/luai.h b/src/net/luai.h
new file mode 100644
index 0000000..5452670
--- /dev/null
+++ b/src/net/luai.h
@@ -0,0 +1,14 @@
+#include "common.h"
+
+void i_write_header(lua_State* L, int header_top, str** _resp, char* content, size_t len);
+
+/**
+ * @brief parses all files in response buffer into a lua table
+ *
+ * @param {lua_State*} lua state to put table into
+ * @param {char*} response buffer
+ * @param {str*} response header Content-Type value
+ * @return {int} lua index of table
+*/
+int rolling_file_parse(lua_State* L, int* files_idx, int* body_idx, char* buffer, str* content_type, size_t blen, struct file_parse* _content);
+
diff --git a/src/net/util.c b/src/net/util.c
new file mode 100644
index 0000000..213be9f
--- /dev/null
+++ b/src/net/util.c
@@ -0,0 +1,241 @@
+#include "common.h"
+#include "util.h"
+
+/**
+ * @brief calls recv into buffer until everything is read
+ *
+*/
+int64_t recv_full_buffer(int client_fd, char** _buffer, int* header_eof, int* state){
+  char* header, *buffer = malloc(BUFFER_SIZE * sizeof * buffer);
+  memset(buffer, 0, BUFFER_SIZE);
+  int64_t len = 0;
+  *header_eof = -1;
+  int n, content_len = -1;
+  //printf("&_\n");
+  for(;;){
+    n = recv(client_fd, buffer + len, BUFFER_SIZE, 0);
+    if(n < 0){
+      *_buffer = buffer;
+      printf("%s %i\n",strerror(errno),errno);
+      if(*header_eof == -1) return -2; //dont even try w/ request, no header to read
+      return -1; //well the header is fine atleast
+
+    };
+    if(*header_eof == -1 && (header = strstr(buffer, "\r\n\r\n")) != NULL){
+      *header_eof = header - buffer;
+      char* cont_len_raw = strstr(buffer, "Content-Length: ");
+      
+      if(cont_len_raw == NULL) {
+        len += n;
+        *_buffer = buffer;
+        return len;
+      }
+      
+      str* cont_len_str = str_init("");
+      if(cont_len_raw == NULL) abort();
+      //i is length of 'Content-Length: '
+      for(int i = 16; cont_len_raw[i] != '\r'; i++) str_pushl(cont_len_str, cont_len_raw + i, 1);
+      content_len = strtol(cont_len_str->c, NULL, 10);
+      str_free(cont_len_str);
+      if(content_len > max_content_length) {
+        *_buffer = buffer;
+        *state = (len + n != content_len + *header_eof + 4);
+        return len + n;
+      }
+      buffer = realloc(buffer, content_len + *header_eof + 4 + BUFFER_SIZE);
+      if(buffer == NULL) p_fatal("unable to allocate");
+    }
+
+    len += n;
+    if(*header_eof == -1){
+      buffer = realloc(buffer, len + BUFFER_SIZE + 1);
+      memset(buffer + len, 0, n + 1);
+    }
+    
+
+    if(content_len != -1 && len - *header_eof - 4 >= content_len) break;
+  }
+  *_buffer = buffer;
+  return len;
+}
+
+/**
+ * @brief converts the request buffer into a parray_t
+ *
+*/
+int parse_header(char* buffer, int header_eof, parray_t** _table){
+  if(header_eof == -1) return -1;
+  char add[] = {0,0};
+  int lines = 3;
+  for(int i = 0; i != header_eof; i++) lines += buffer[i] == '\n';
+  parray_t* table = parray_init();
+  str* current = str_init("");
+  int oi = 0;
+  int item = 0;
+  for(; oi != header_eof; oi++){
+    if(buffer[oi] == ' ' || buffer[oi] == '\n'){
+      if(buffer[oi] == '\n') current->c[current->len - 1] = 0;
+      parray_set(table, item == 0 ? "Request" :
+                item == 1 ? "Path" : "Version", (void*)str_init(current->c));
+      str_clear(current);
+      item++;
+      if(buffer[oi] == '\n') break;
+    } else str_pushl(current, buffer + oi, 1);
+  }
+
+  int key = 1;
+  str* sw = NULL;
+  for(int i = oi + 1; i != header_eof; i++){
+    if(buffer[i] == ' ' && strcmp(current->c, "") == 0) continue;
+    if(key && buffer[i] == ':' || !key && buffer[i] == '\n'){
+      if(key){
+        sw = current;
+        current = str_init("");
+        key = 0;
+      } else {
+        if(buffer[oi] == '\n') current->c[current->len - 1] = 0;
+        parray_set(table, sw->c, (void*)str_init(current->c));
+        str_clear(current);
+        str_free(sw);
+        sw = NULL;
+        key = 1;
+      }
+      continue;
+    } else str_pushl(current, buffer + i, 1);
+  }
+  parray_set(table, sw->c, (void*)str_init(current->c));
+
+  str_free(current);
+  if(sw != NULL) str_free(sw);
+  *_table = table;
+  return 0;
+}
+
+/**
+ * @brief contructs an http request
+ *
+*/
+void http_build(str** _dest, int code, char* code_det, char* header_vs, char* content, size_t len){
+  char* dest = malloc(HTTP_BUFFER_SIZE);
+  memset(dest, 0, HTTP_BUFFER_SIZE);
+
+  sprintf(dest, 
+    "HTTP/1.1 %i %s\r\n"
+    "%s"
+    "\r\n"
+    , code, code_det, header_vs);
+  *_dest = str_init(dest);
+  str_pushl(*_dest, content, len);
+
+  free(dest);
+}
+
+/**
+ * @brief gets a string representation of a http code
+ * 
+*/
+void http_code(int code, char* code_det){
+  //this was done with a script btw
+  switch(code){
+    case 100: sprintf(code_det,"Continue"); break;
+    case 101: sprintf(code_det,"Switching Protocols"); break;
+    case 102: sprintf(code_det,"Processing"); break;
+    case 103: sprintf(code_det,"Early Hints"); break;
+    case 200: sprintf(code_det,"OK"); break;
+    case 201: sprintf(code_det,"Created"); break;
+    case 202: sprintf(code_det,"Accepted"); break;
+    case 203: sprintf(code_det,"Non-Authoritative Information"); break;
+    case 204: sprintf(code_det,"No Content"); break;
+    case 205: sprintf(code_det,"Reset Content"); break;
+    case 206: sprintf(code_det,"Partial Content"); break;
+    case 207: sprintf(code_det,"Multi-Status"); break;
+    case 208: sprintf(code_det,"Already Reported"); break;
+    case 226: sprintf(code_det,"IM Used"); break;
+    case 300: sprintf(code_det,"Multiple Choices"); break;
+    case 301: sprintf(code_det,"Moved Permanently"); break;
+    case 302: sprintf(code_det,"Found"); break;
+    case 303: sprintf(code_det,"See Other"); break;
+    case 304: sprintf(code_det,"Not Modified"); break;
+    case 307: sprintf(code_det,"Temporary Redirect"); break;
+    case 308: sprintf(code_det,"Permanent Redirect"); break;
+    case 400: sprintf(code_det,"Bad Request"); break;
+    case 401: sprintf(code_det,"Unauthorized"); break;
+    case 402: sprintf(code_det,"Payment Required"); break;
+    case 403: sprintf(code_det,"Forbidden"); break;
+    case 404: sprintf(code_det,"Not Found"); break;
+    case 405: sprintf(code_det,"Method Not Allowed"); break;
+    case 406: sprintf(code_det,"Not Acceptable"); break;
+    case 407: sprintf(code_det,"Proxy Authentication Required"); break;
+    case 408: sprintf(code_det,"Request Timeout"); break;
+    case 409: sprintf(code_det,"Conflict"); break;
+    case 410: sprintf(code_det,"Gone"); break;
+    case 411: sprintf(code_det,"Length Required"); break;
+    case 412: sprintf(code_det,"Precondition Failed"); break;
+    case 413: sprintf(code_det,"Content Too Large"); break;
+    case 414: sprintf(code_det,"URI Too Long"); break;
+    case 415: sprintf(code_det,"Unsupported Media Type"); break;
+    case 416: sprintf(code_det,"Range Not Satisfiable"); break;
+    case 417: sprintf(code_det,"Expectation Failed"); break;
+    case 418: sprintf(code_det,"I'm a teapot"); break;
+    case 421: sprintf(code_det,"Misdirected Request"); break;
+    case 422: sprintf(code_det,"Unprocessable Content"); break;
+    case 423: sprintf(code_det,"Locked"); break;
+    case 424: sprintf(code_det,"Failed Dependency"); break;
+    case 425: sprintf(code_det,"Too Early"); break;
+    case 426: sprintf(code_det,"Upgrade Required"); break;
+    case 428: sprintf(code_det,"Precondition Required"); break;
+    case 429: sprintf(code_det,"Too Many Requests"); break;
+    case 431: sprintf(code_det,"Request Header Fields Too Large"); break;
+    case 451: sprintf(code_det,"Unavailable For Legal Reasons"); break;
+    case 500: sprintf(code_det,"Internal Server Error"); break;
+    case 501: sprintf(code_det,"Not Implemented"); break;
+    case 502: sprintf(code_det,"Bad Gateway"); break;
+    case 503: sprintf(code_det,"Service Unavailable"); break;
+    case 504: sprintf(code_det,"Gateway Timeout"); break;
+    case 505: sprintf(code_det,"HTTP Version Not Supported"); break;
+    case 506: sprintf(code_det,"Variant Also Negotiates"); break;
+    case 507: sprintf(code_det,"Insufficient Storage"); break;
+    case 508: sprintf(code_det,"Loop Detected"); break;
+    case 510: sprintf(code_det,"Not Extended"); break;
+    case 511: sprintf(code_det,"Network Authentication Required"); break;
+    default: sprintf(code_det,"unknown");
+  }
+}
+
+void client_fd_errors(int client_fd){
+  if(client_fd>=0) return;
+
+  switch(client_fd){
+    case -1:
+      p_fatal("client fd already closed\n");
+    case -2:
+      p_fatal("request was partial\n");
+    default:
+      p_fatal("unknown negative client_fd value");
+  }
+}
+
+int content_disposition(str* src, parray_t** _dest){
+
+  char* end = strnstr(src->c, ";", src->len);
+  parray_t* dest = parray_init();
+  if(end == NULL){
+    parray_set(dest, "form-data", (void*)str_init(src->c));
+    return 0;
+  }
+  str* temp = str_init("");
+  str_pushl(temp, src->c, end - src->c);
+  parray_set(dest, "form-data", (void*)temp);
+
+  int len = end - src->c;
+  char* buffer = end + 1;
+
+  gen_parse(buffer, src->len - len, &dest);
+  //printf("\n**\n");
+  //for(int i = 0; i != dest->len; i++){
+  //  printf("'%s : %s'\n",((str*)dest->P[i].key)->c,((str*)dest->P[i].value)->c);
+  //}
+  *_dest = dest;
+
+  return 1;
+}
diff --git a/src/net/util.h b/src/net/util.h
new file mode 100644
index 0000000..d723b6f
--- /dev/null
+++ b/src/net/util.h
@@ -0,0 +1,47 @@
+#include "common.h"
+
+/**
+ * @brief calls recv into buffer until everything is read
+ *
+ * buffer is allocated in BUFFER_SIZE chunks
+ *
+ * @param {int} fd of the connection
+ * @param {char**} pointer to a unallocated buffer
+ * @param {int*} pointer to an int, will be where the header ends
+ * @return {int64_t} bytes read, -1 if the body was damaged, -2 if the header was
+*/
+int64_t recv_full_buffer(int client_fd, char** _buffer, int* header_eof, int* state);
+
+/**
+ * @brief converts the request buffer into a parray_t
+ *
+ * @param {char*} request buffer
+ * @param {int} where the header ends
+ * @param {parray_t**} pointer to a unallocated parray_t
+ * @return {int} returns 0 or -1 on failure
+*/
+int parse_header(char* buffer, int header_eof, parray_t** _table);
+
+/**
+ * @brief contructs an http request
+ *
+ * @param {str**} pointer to an unallocated destination string
+ * @param {int} response code
+ * @param {char*} string representation of the response code
+ * @param {char*} all other header values
+ * @param {char*} response content
+ * @param {size_t} content length
+*/
+void http_build(str** _dest, int code, char* code_det, char* header_vs, char* content, size_t len);
+
+/**
+ * @brief gets a string representation of a http code
+ *
+ * @param {int} http response code
+ * @param {char*} allocated destination string
+*/
+void http_code(int code, char* code_det);
+
+void client_fd_errors(int client_fd);
+
+int content_disposition(str* src, parray_t** _dest);
-- 
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