diff options
Diffstat (limited to 'response.c')
-rw-r--r-- | response.c | 104 |
1 files changed, 104 insertions, 0 deletions
@@ -1,10 +1,114 @@ #include "response.h" #include <stdio.h> +#include <stdlib.h> +#include <string.h> #include <unistd.h> +#include <lua.h> + #include "http.h" +/// Sends a response based on the current top value on the stack. +/// \param L Lua state to send response for +/// \param fd File descriptor of a socket to write to +/// \return Bytes written or -1 on error +/// \see write(2) +// TODO: Consider splitting response_send into smaller functions. +int response_send(lua_State * L, const int fd) +{ + static const char * error_response = + "HTTP/1.1 500\r\n" + "Connection: close\r\n" + "\r\n"; + + if (0 == lua_istable(L, -1) || 0 == lua_checkstack(L, 5)) + { + lua_pop(L, 1); + return write(fd, error_response, strlen(error_response)); + } + + int bytes_total = 2048 * sizeof(char); + int bytes_used = 0; + char * buffer = malloc(bytes_total); + + lua_pushstring(L, "status"); + lua_gettable(L, -2); + const lua_Integer status = lua_tointeger(L, -1); + lua_pop(L, 1); + + if (0 == status || NULL == buffer) + { + lua_pop(L, 1); + return write(fd, error_response, strlen(error_response)); + } + + bytes_used = snprintf(buffer, bytes_total, "HTTP/1.1 %d\r\n\r\n", (int) status) - 2; + + lua_pushstring(L, "headers"); + lua_gettable(L, -2); + + if (0 == lua_istable(L, -1)) + { + lua_pop(L, 2); + return write(fd, buffer, bytes_used + 2); + } + + static const char * header_pattern = "%s: %s\r\n"; + + lua_pushnil(L); + while (0 != lua_next(L, -2) && 0 != lua_isstring(L, -2)) + { + const char * key = lua_tostring(L, -2); + const char * value = lua_tostring(L, -1); // TODO: Check the type of the header's value? + const int bytes_left = bytes_total - bytes_used; + int new_bytes = snprintf(buffer + bytes_used, bytes_left, header_pattern, key, value); + while (bytes_left <= new_bytes) + { + bytes_total += 2048; + if (65536 < bytes_total) + { + free(buffer); + lua_pop(L, 4); + return write(fd, error_response, strlen(error_response)); + } + buffer = realloc(buffer, bytes_total); + if (NULL == buffer) + { + lua_pop(L, 4); + return write(fd, error_response, strlen(error_response)); + } + new_bytes = snprintf(buffer + bytes_used, bytes_left, header_pattern, key, value); + } + bytes_used += new_bytes; + lua_pop(L, 1); + } + + if (bytes_total < bytes_used + 2) + { + bytes_total += 2; + buffer = realloc(buffer, bytes_total); + if (NULL == buffer) + { + lua_pop(L, 2); + return write(fd, error_response, strlen(error_response)); + } + } + + lua_pop(L, 1); + buffer[bytes_used] = '\r'; + buffer[bytes_used + 1] = '\n'; + bytes_used += 2; + + // TODO: Add data write + + int result = write(fd, buffer, bytes_used ); + free(buffer); + lua_pop(L, 1); + + return result; +} + /// Sends a simple response only with a status to the client. /// \param fd File descriptor of the client socket /// \param status HTTP response status code |