diff options
Diffstat (limited to 'http.c')
| -rw-r--r-- | http.c | 351 |
1 files changed, 0 insertions, 351 deletions
@@ -1,15 +1,5 @@ #include "http.h" -#include <ctype.h> -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -static const int REQUEST_DATA_SIZE = 4096; -static const int MAX_HEADERS = 30; - const char * status_str[] = { [STATUS_OK] = "200 OK", [STATUS_BAD_REQUEST] = "400 Bad Request", @@ -19,344 +9,3 @@ const char * status_str[] = { [STATUS_NOT_IMPLEMENTED] = "501 Not Implemented", [STATUS_VERSION_NOT_SUPPORTED] = "505 Version Not Supported", }; - -/// Allocates and initializes request structure. -/// \return Pointer to initialized request or NULL in case of an error -/// \see /free_request -struct request * new_request(void) -{ - struct request * request = malloc(sizeof(struct request)); - - if (NULL == request) - { - return NULL; - } - - memset(request, 0, sizeof(struct request)); - request->step = parse_step_method; - - request->data = malloc(REQUEST_DATA_SIZE); - - if (NULL == request->data) - { - free(request); - return NULL; - } - - return request; -} - -/// Releases memory used by the request and the request itself. -/// \param request Request to free -/// \see /new_request -void free_request(struct request * request) -{ - if (NULL != request->data) - { - free(request->data); - } - - if (NULL != request->headerv) - { - free(request->headerv); - } - - free(request); -} - -/// 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 -/// \return Negative value if an error was encountered; numbers of bytes written otherwise -int respond_only_status(const int fd, const enum status status) -{ - static const char * pattern = - "HTTP/1.1 %s\r\n" - "Connection: close\r\n" - "\r\n"; - - return dprintf(fd, pattern, status_str[status]); -} - -/// Sends a response with a status and a body to the client. -/// \param fd File descriptor of the client socket -/// \param status HTTP response status code -/// \param body Content that will be sent -/// \param size Size of the content in bytes -/// \return Negative value if an error was encountered; numbers of bytes written otherwise -int respond_with_body(const int fd, const enum status status, const char * body, const int size) -{ - static const char * pattern = - "HTTP/1.1 %s\r\n" - "Connection: close\r\n" - "Content-Type: application/json\r\n" - "Content-Size: %d\r\n" - "\r\n"; - - if (0 > dprintf(fd, pattern, status_str[status], size)) - { - return -1; // TODO: Handle errors properly - } - - return write(fd, body, size); -} - -/// Collects request between calls to `poll`. -/// \param fd Client socket -/// \param request Pointer to current request context of handled client -/// \return Number of bytes parsed, -1 if an error occured or 0 if expects more data -int parse_request(const int fd, struct request ** request) -{ - if (NULL == *request) - { - *request = new_request(); - if (NULL == *request) - { - return -1; - } - } - - // TODO: Expand buffer until EAGAIN or arbitrary limit - int length = read(fd, (*request)->data, REQUEST_DATA_SIZE - 1); - - if (0 == length || (-1 == length && EWOULDBLOCK != errno && EAGAIN != errno)) - { - return -1; // TODO: Handle errors properly - } - - (*request)->data[length] = 0; - (*request)->length = length; - - return (*request)->step(*request); -} - - -/// Progresses the readout of the request until delimiter is found. -/// \param request Request to process -/// \param delimiter Character that marks the end of the readout -/// \return Position of the delimiter or 0 if the deliminter could not be found -static int read_until_char(struct request * request, const char delimiter) -{ - char character; - while (request->position < request->length) - { - character = request->data[request->position]; - if (delimiter == character) - { - return request->position; - } - request->position++; - } - return 0; -} - -/// Progresses the readout of the request until non-whitespace character is found. -/// \param request Request to process -/// \return Position of the first non-whitespace character or 0 if it could not be found -/// \see isalpha(3) -static int read_until_word(struct request * request) -{ - char character; - while (request->position < request->length) - { - character = request->data[request->position]; - if (!isspace(character)) - { - return request->position; - } - request->position++; - } - return 0; -} - -/// Progresses the readout of the request until line separator is found. -/// \param request Request to process -/// \return Position of the first byte of the separator or 0 if line separator could not be found -static int read_rest_of_line(struct request * request) -{ - while (request->position < request->length - 1) - { - if ('\r' == request->data[request->position] && '\n' == request->data[request->position + 1]) - { - return request->position; - } - else if ('\r' == request->data[request->position + 1]) - { - request->position += 1; - } - else - { - request->position += 2; - } - } - return 0; -} - -/// Parses method field of the request. -/// \param request Request to process -/// \return -1 if an error has occured, 0 if too little data available or total number of bytes processed -int parse_step_method(struct request * request) -{ - request->method.length = read_until_char(request, ' '); - - if (0 == request->method.length) - { - return 0; - } - - request->step = parse_step_path; - - return parse_step_path(request); -} - -/// Parses path field of the request. -/// \param request Request to process -/// \return -1 if an error has occured, 0 if too little data available or total number of bytes processed -// TODO: Consider spliting path into an actual path and arguments in this stage -int parse_step_path(struct request * request) -{ - if (0 >= request->path.start) - { - request->path.start = read_until_word(request); - - if (0 == request->path.start) - { - return 0; - } - } - - const int result = read_until_char(request, ' '); - - if (0 == result) - { - return 0; - } - - request->path.length = request->position - request->path.start; - request->step = parse_step_version; - - return parse_step_version(request); -} - -/// Parses and verifies http version field of the request. -/// \param request Request to process -/// \return -1 if an error has occured, 0 if too little data available or total number of bytes processed -// TODO: Return -1 if version is unsupported, meaning other than HTTP/1.1 -int parse_step_version(struct request * request) -{ - if (0 >= request->version.start) - { - request->version.start = read_until_word(request); - - if (0 == request->version.start) - { - return 0; - } - } - - const int result = read_rest_of_line(request); - - if (0 == result) - { - return 0; - } - - request->version.length = request->position - request->version.start; - request->step = parse_step_header_name; - - return parse_step_header_name(request); -} - -/// Parses and verifies name of a single header from the request. -/// \param request Request to process -/// \return -1 if an error has occured, 0 if too little data available or total number of bytes processed -int parse_step_header_name(struct request * request) -{ - if (NULL == request->headerv) - { - request->headerv = malloc(sizeof(struct header) * MAX_HEADERS); - request->headerc = 0; - memset(request->headerv, 0, sizeof(struct header) * MAX_HEADERS); - - if (NULL == request->headerv) - { - return -1; - } - } - - // TODO: Check for the header section end without backtracking. - const int position = request->position; - int result = read_rest_of_line(request); - - if (0 == result) - { - return 0; - } - - if (2 == result - position) - { - // Header section ended, nothing left to parse. - return request->position + 2; - } - - request->position = position; - - if (0 >= request->headerv[request->headerc].name.start) - { - request->headerv[request->headerc].name.start = read_until_word(request); - - if (0 == request->headerv[request->headerc].name.start) - { - return 0; - } - } - - result = read_until_char(request, ':'); - - if (0 == result) - { - return 0; - } - - request->headerv[request->headerc].name.length = request->position - request->headerv[request->headerc].name.start; - request->step = parse_step_header_value; - - // Skip ':' - request->position++; - - return parse_step_header_value(request); -} - -/// Parses and verifies value of a single header from the request. -/// \param request Request to process -/// \return -1 if an error has occured, 0 if too little data available or total number of bytes processed -int parse_step_header_value(struct request * request) -{ - if (0 >= request->headerv[request->headerc].value.start) - { - request->headerv[request->headerc].value.start = read_until_word(request); - - if (0 == request->headerv[request->headerc].value.start) - { - return 0; - } - } - - const int result = read_rest_of_line(request); - - if (0 == result) - { - return 0; - } - - request->headerv[request->headerc].value.length = request->position - request->headerv[request->headerc].value.start; - request->step = parse_step_header_name; - request->headerc++; - - if (MAX_HEADERS == request->headerc) - { - return -1; - } - - return parse_step_header_name(request); -} |