Fix warnings

.gitignore

@@ -1,3 +1,4 @@
 /c_simple_http
 /objs/
 /unit_test
+/build*/

CMakeLists.txt

@@ -0,0 +1,81 @@
+cmake_minimum_required(VERSION 3.25)
+project(c_simple_http C)
+
+set(c_simple_http_SOURCES
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/arg_parse.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/big_endian.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/tcp_socket.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/signal_handling.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/globals.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/http.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/config.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/http_template.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/third_party/SimpleArchiver/src/helpers.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/third_party/SimpleArchiver/src/data_structures/linked_list.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/third_party/SimpleArchiver/src/data_structures/hash_map.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/third_party/SimpleArchiver/src/data_structures/priority_heap.c"
+  "${CMAKE_CURRENT_SOURCE_DIR}/third_party/SimpleArchiver/src/algorithms/linear_congruential_gen.c"
+)
+
+if(NOT DEFINED CMAKE_BUILD_TYPE OR "${CMAKE_BUILD_TYPE}" STREQUAL "")
+    message("Defaulting to \"Debug\" build type.")
+    set(CMAKE_BUILD_TYPE "Debug" CACHE STRING "Build type" FORCE)
+else()
+    message("Using build type \"${CMAKE_BUILD_TYPE}\".")
+endif()
+
+add_executable(c_simple_http
+  ${c_simple_http_SOURCES}
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/main.c"
+)
+target_include_directories(c_simple_http PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/third_party")
+
+add_executable(unit_tests
+  ${c_simple_http_SOURCES}
+  "${CMAKE_CURRENT_SOURCE_DIR}/src/test.c"
+)
+target_include_directories(unit_tests PUBLIC "${CMAKE_CURRENT_SOURCE_DIR}/third_party")
+
+target_compile_options(c_simple_http PUBLIC
+$<IF:$<CONFIG:Debug>,-Og,-fno-delete-null-pointer-checks -fno-strict-overflow -fno-strict-aliasing -ftrivial-auto-var-init=zero>
+-Wall -Wformat -Wformat=2 -Wconversion -Wimplicit-fallthrough
+-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
+-D_GLIBCXX_ASSERTIONS
+-fstrict-flex-arrays=3
+-fstack-clash-protection -fstack-protector-strong
+-fPIC
+)
+
+target_link_options(c_simple_http PUBLIC
+$<IF:$<CONFIG:Debug>,-Og,-fno-delete-null-pointer-checks -fno-strict-overflow -fno-strict-aliasing -ftrivial-auto-var-init=zero>
+-Wall -Wformat -Wformat=2 -Wconversion -Wimplicit-fallthrough
+-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
+-D_GLIBCXX_ASSERTIONS
+-fstrict-flex-arrays=3
+-fstack-clash-protection -fstack-protector-strong
+-Wl,-z,noexecstack
+-Wl,-z,relro -Wl,-z,now
+-fPIC
+)
+
+target_compile_options(unit_tests PUBLIC
+$<IF:$<CONFIG:Debug>,-Og,-fno-delete-null-pointer-checks -fno-strict-overflow -fno-strict-aliasing -ftrivial-auto-var-init=zero>
+-Wall -Wformat -Wformat=2 -Wconversion -Wimplicit-fallthrough
+-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
+-D_GLIBCXX_ASSERTIONS
+-fstrict-flex-arrays=3
+-fstack-clash-protection -fstack-protector-strong
+-fPIC
+)
+
+target_link_options(unit_tests PUBLIC
+$<IF:$<CONFIG:Debug>,-Og,-fno-delete-null-pointer-checks -fno-strict-overflow -fno-strict-aliasing -ftrivial-auto-var-init=zero>
+-Wall -Wformat -Wformat=2 -Wconversion -Wimplicit-fallthrough
+-U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=3
+-D_GLIBCXX_ASSERTIONS
+-fstrict-flex-arrays=3
+-fstack-clash-protection -fstack-protector-strong
+-Wl,-z,noexecstack
+-Wl,-z,relro -Wl,-z,now
+-fPIC
+)

src/config.c

@@ -237,10 +237,11 @@ typedef struct C_SIMPLE_HTTP_INTERNAL_RequiredIter {
 
 int c_simple_http_required_iter_fn(void *data, void *ud) {
   C_SIMPLE_HTTP_INTERNAL_RequiredIter *req_iter_struct = ud;
+  unsigned int data_str_length = (unsigned int)strlen(data) + 1;
   if (simple_archiver_hash_map_get(
       req_iter_struct->hash_map,
       data,
-      strlen(data) + 1) == NULL) {
+      data_str_length) == NULL) {
     if (req_iter_struct->path) {
       fprintf(
         stderr,
@@ -266,11 +267,12 @@ typedef struct C_SIMPLE_HTTP_INTERNAL_RequiredCheck {
 
 int c_simple_http_check_required_iter_fn(void *path_void_str, void *ud) {
   C_SIMPLE_HTTP_INTERNAL_RequiredCheck *req = ud;
+  unsigned int path_void_str_len = (unsigned int)strlen(path_void_str) + 1;
   C_SIMPLE_HTTP_HashMapWrapper *wrapper =
     simple_archiver_hash_map_get(
       req->map_of_paths_and_their_vars,
       path_void_str,
-      strlen(path_void_str) + 1);
+      path_void_str_len);
   if (!wrapper) {
     fprintf(stderr,
             "WARNING: Map of paths does not have path \"%s\"!\n",
@@ -301,7 +303,8 @@ C_SIMPLE_HTTP_ParsedConfig c_simple_http_parse_config(
     fprintf(stderr, "ERROR: separating_key argument is NULL!\n");
     return config;
   }
-  const unsigned int separating_key_size = strlen(separating_key) + 1;
+  const unsigned int separating_key_size =
+    (unsigned int)strlen(separating_key) + 1;
 
   config.hash_map = simple_archiver_hash_map_init();
 
@@ -384,7 +387,7 @@ C_SIMPLE_HTTP_ParsedConfig c_simple_http_parse_config(
     }
     if ((state & 1) == 0) {
       if (c != '=') {
-        key_buf[key_idx++] = c;
+        key_buf[key_idx++] = (unsigned char)c;
         if (key_idx >= C_SIMPLE_HTTP_CONFIG_BUF_SIZE) {
           fprintf(stderr,
                   "ERROR: config file \"key\" is larger than %u bytes!\n",
@@ -408,7 +411,7 @@ C_SIMPLE_HTTP_ParsedConfig c_simple_http_parse_config(
       }
     } else if ((state & 1) == 1) {
       if ((c != '\n' && c != '\r') || (state & 0xC) != 0) {
-        value_buf[value_idx++] = c;
+        value_buf[value_idx++] = (unsigned char)c;
         if (value_idx >= C_SIMPLE_HTTP_CONFIG_BUF_SIZE) {
           fprintf(stderr,
                   "ERROR: config file \"value\" is larger than %u bytes!\n",

src/http_template.c

@@ -103,8 +103,14 @@ char *c_simple_http_path_to_generated(
   if (output_buf_size) {
     *output_buf_size = 0;
   }
+  size_t path_len_size_t = strlen(path) + 1;
+  if (path_len_size_t > 0xFFFFFFFF) {
+    fprintf(stderr, "ERROR: Path string is too large!\n");
+    return NULL;
+  }
+  unsigned int path_len = (unsigned int)path_len_size_t;
   C_SIMPLE_HTTP_ParsedConfig *wrapped_hash_map =
-    simple_archiver_hash_map_get(templates->hash_map, path, strlen(path) + 1);
+    simple_archiver_hash_map_get(templates->hash_map, path, path_len);
   if (!wrapped_hash_map) {
     return NULL;
   }
@@ -129,13 +135,13 @@ char *c_simple_http_path_to_generated(
     if (fseek(f, 0, SEEK_SET) != 0) {
       return NULL;
     }
-    html_buf = malloc(html_file_size + 1);
+    html_buf = malloc((size_t)html_file_size + 1);
-    size_t ret = fread(html_buf, 1, html_file_size, f);
+    size_t ret = fread(html_buf, 1, (size_t)html_file_size, f);
     if (ret != (size_t)html_file_size) {
       return NULL;
     }
     html_buf[html_file_size] = 0;
-    html_buf_size = html_file_size;
+    html_buf_size = (size_t)html_file_size;
   } else {
     char *stored_html =
       simple_archiver_hash_map_get(wrapped_hash_map->hash_map, "HTML", 5);
@@ -215,7 +221,7 @@ char *c_simple_http_path_to_generated(
             simple_archiver_hash_map_get(
               wrapped_hash_map->hash_map,
               var,
-              var_size + 1);
+              (unsigned int)var_size + 1);
           if (value_c_str) {
             if (c_simple_http_internal_ends_with_FILE(var) == 0) {
               // Load from file specified by "value_c_str".

src/main.c

@@ -39,6 +39,13 @@
 #include "constants.h"
 #include "http.h"
 
+#define CHECK_ERROR_WRITE(write_expr) \
+  if (write_expr < 0) { \
+    close(connection_fd); \
+    fprintf(stderr, "ERROR Failed to write to connected peer, closing...\n"); \
+    continue; \
+  }
+
 int main(int argc, char **argv) {
   Args args = parse_args(argc, argv);
 
@@ -113,6 +120,13 @@ int main(int argc, char **argv) {
       puts("");
       int connection_fd = ret;
       read_ret = read(connection_fd, recv_buf, C_SIMPLE_HTTP_RECV_BUF_SIZE);
+      if (read_ret < 0) {
+        close(connection_fd);
+        fprintf(
+          stderr,
+          "WARNING Failed to read from new connection, closing...\n");
+        continue;
+      }
       // DEBUG print received buf.
       for (unsigned int idx = 0;
           idx < C_SIMPLE_HTTP_RECV_BUF_SIZE && idx < read_ret;
@@ -128,11 +142,11 @@ int main(int argc, char **argv) {
 
       size_t response_size = 0;
       const char *response = c_simple_http_request_response(
-        (const char*)recv_buf, read_ret, &parsed_config, &response_size);
+        (const char*)recv_buf, (unsigned int)read_ret, &parsed_config, &response_size);
       if (response) {
-        write(connection_fd, "HTTP/1.1 200 OK\n", 16);
+        CHECK_ERROR_WRITE(write(connection_fd, "HTTP/1.1 200 OK\n", 16));
-        write(connection_fd, "Allow: GET\n", 11);
+        CHECK_ERROR_WRITE(write(connection_fd, "Allow: GET\n", 11));
-        write(connection_fd, "Content-Type: text/html\n", 24);
+        CHECK_ERROR_WRITE(write(connection_fd, "Content-Type: text/html\n", 24));
         char content_length_buf[128];
         size_t content_length_buf_size = 0;
         memcpy(content_length_buf, "Content-Length: ", 16);
@@ -144,19 +158,26 @@ int main(int argc, char **argv) {
           "%lu\n%n",
           response_size,
           &written);
-        content_length_buf_size += written;
+        if (written <= 0) {
-        write(connection_fd, content_length_buf, content_length_buf_size);
+          close(connection_fd);
-        write(connection_fd, "\n", 1);
+          fprintf(
-        write(connection_fd, response, response_size);
+            stderr,
+            "WARNING Failed to write in response, closing connection...\n");
+          continue;
+        }
+        content_length_buf_size += (size_t)written;
+        CHECK_ERROR_WRITE(write(connection_fd, content_length_buf, content_length_buf_size));
+        CHECK_ERROR_WRITE(write(connection_fd, "\n", 1));
+        CHECK_ERROR_WRITE(write(connection_fd, response, response_size));
 
         free((void*)response);
       } else {
         // TODO handle internal errors also.
-        write(connection_fd, "HTTP/1.1 404 Not Found\n", 23);
+        CHECK_ERROR_WRITE(write(connection_fd, "HTTP/1.1 404 Not Found\n", 23));
-        write(connection_fd, "Allow: GET\n", 11);
+        CHECK_ERROR_WRITE(write(connection_fd, "Allow: GET\n", 11));
-        write(connection_fd, "Content-Type: text/html\n", 24);
+        CHECK_ERROR_WRITE(write(connection_fd, "Content-Type: text/html\n", 24));
-        write(connection_fd, "Content-Length: 14\n", 19);
+        CHECK_ERROR_WRITE(write(connection_fd, "Content-Length: 14\n", 19));
-        write(connection_fd, "\n404 Not Found\n", 15);
+        CHECK_ERROR_WRITE(write(connection_fd, "\n404 Not Found\n", 15));
       }
       close(connection_fd);
     } else {