Zander671/cse-130-http-server
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Update stuff

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This commit is contained in:
Alexander Rosenberg
2026-05-26 00:54:34 -07:00
parent 5dfbdc43c0
commit cf8ddf14bf
2 changed files with 124 additions and 77 deletions
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http.c
+45 -35
View File
@@ -5,10 +5,11 @@
#include <string.h>
#include <unistd.h>
static const char *EMPTY_STRING = "";
static const char* EMPTY_STRING = "";
HTTPHeaderList *http_header_list_push(HTTPHeaderList *list, const char *key, const char *value) {
HTTPHeaderList *new = malloc(sizeof(HTTPHeaderList));
HTTPHeaderList* http_header_list_push(HTTPHeaderList* list, const char* key, const char* value)
{
HTTPHeaderList* new = malloc(sizeof(HTTPHeaderList));
if (!new) {
return NULL;
}
@@ -31,9 +32,10 @@ HTTPHeaderList *http_header_list_push(HTTPHeaderList *list, const char *key, con
return new;
}
void free_http_header_list(HTTPHeaderList *list) {
void free_http_header_list(HTTPHeaderList* list)
{
while (list) {
HTTPHeaderList *next = list->next;
HTTPHeaderList* next = list->next;
free(list->key);
free(list->value);
free(list);
@@ -41,7 +43,8 @@ void free_http_header_list(HTTPHeaderList *list) {
}
}
const char *http_header_list_search(HTTPHeaderList *list, const char *key, const char *def) {
const char* http_header_list_search(HTTPHeaderList* list, const char* key, const char* def)
{
while (list) {
if (strcmp(list->key, key) == 0) {
return list->value;
@@ -51,21 +54,22 @@ const char *http_header_list_search(HTTPHeaderList *list, const char *key, const
return def;
}
#define MAX_REQUEST_LENGTH 16384
#define MAX_METHOD_LENGTH 16
#define MAX_URI_LENGTH 256
#define MAX_VERSION_LENGTH 3
#define MAX_HEADER_KEY_LENGTH 2048
#define MAX_REQUEST_LENGTH 16384
#define MAX_METHOD_LENGTH 16
#define MAX_URI_LENGTH 256
#define MAX_VERSION_LENGTH 3
#define MAX_HEADER_KEY_LENGTH 2048
#define MAX_HEADER_VALUE_LENGTH 2048
#define RETURN_IF_READ_ERROR(s) \
if (ferror((s))) { \
return HRPR_READ_FAILED; \
#define RETURN_IF_READ_ERROR(s) \
if (ferror((s))) { \
return HRPR_READ_FAILED; \
}
// if an error occured, req->uri is not allocated
static HTTPRequestParseResult parse_method_uri_line(
FILE *stream, size_t *restrict bytes_read, HTTPRequest *restrict req) {
FILE* stream, size_t* restrict bytes_read, HTTPRequest* restrict req)
{
// allow for some leeway in passing incorrect methods
char method[MAX_METHOD_LENGTH + 1];
char uri[MAX_URI_LENGTH + 1];
@@ -73,7 +77,7 @@ static HTTPRequestParseResult parse_method_uri_line(
char whitespace[4];
ssize_t signed_bytes_read;
#define S1(s) #s
#define S(s) S1(s)
#define S(s) S1(s)
int nconv = fscanf(stream,
// clang-format off
"%" S(MAX_METHOD_LENGTH) "[A-Z]"
@@ -109,8 +113,9 @@ static HTTPRequestParseResult parse_method_uri_line(
// return true if there are more headers and no error occurred, false otherwise
// this will *not* free LIST if an error occurs
static bool next_header(FILE *stream, size_t *restrict bytes_read,
HTTPRequestParseResult *restrict res, HTTPHeaderList *restrict *restrict list) {
static bool next_header(FILE* stream, size_t* restrict bytes_read,
HTTPRequestParseResult* restrict res, HTTPHeaderList* restrict* restrict list)
{
char c = fgetc(stream);
RETURN_IF_READ_ERROR(stream);
if (c == '\r') {
@@ -130,7 +135,7 @@ static bool next_header(FILE *stream, size_t *restrict bytes_read,
char whitespace[3];
ssize_t signed_bytes_read;
#define S1(s) #s
#define S(s) S1(s)
#define S(s) S1(s)
int nconv = fscanf(stream,
// clang-format off
"%" S(MAX_HEADER_KEY_LENGTH) "[a-zA-Z0-9.-]"
@@ -154,16 +159,17 @@ static bool next_header(FILE *stream, size_t *restrict bytes_read,
return true;
}
HTTPRequestParseResult parse_http_request(FILE *stream, HTTPRequest *restrict out) {
HTTPRequestParseResult parse_http_request(FILE* stream, HTTPRequest* restrict out)
{
out->uri = EMPTY_STRING;
out->path = EMPTY_STRING;
out->method = EMPTY_STRING;
out->headers = NULL;
size_t total_bytes;
HTTPRequestParseResult res;
if ((res = parse_method_uri_line(stream, &total_bytes, out)) != HRPR_OK) {
return res;
}
out->headers = NULL;
size_t bytes_read;
while (next_header(stream, &bytes_read, &res, &out->headers)) {
if ((total_bytes += bytes_read) > MAX_REQUEST_LENGTH) {
@@ -174,20 +180,22 @@ HTTPRequestParseResult parse_http_request(FILE *stream, HTTPRequest *restrict ou
return res;
}
void free_http_request(HTTPRequest *restrict req) {
void free_http_request(HTTPRequest* restrict req)
{
if (req->method != EMPTY_STRING) {
free((char *) req->method);
free((char*)req->method);
}
if (req->uri != EMPTY_STRING) {
free((char *) req->uri);
free((char*)req->uri);
}
free_http_header_list(req->headers);
}
const char *status_code_to_message(int status, size_t *restrict length) {
const char* status_code_to_message(int status, size_t* restrict length)
{
static const struct {
int code;
const char *msg;
const char* msg;
size_t size;
} CODES[] = {
#define P(s, m) { s, m, sizeof(m) - 1 }
@@ -213,15 +221,17 @@ const char *status_code_to_message(int status, size_t *restrict length) {
return NULL;
}
void format_http_response(FILE *stream, HTTPResponse *restrict resp) {
void format_http_response(FILE* stream, HTTPResponse* restrict resp)
{
assert(status_code_to_message(resp->status, NULL));
fprintf(stream, "HTTP/1.1 %d %s\r\n", resp->status, status_code_to_message(resp->status, NULL));
fprintf(stream, "Content-Length: %zu\r\n", resp->body_length);
for (HTTPHeaderList *h = resp->headers; h; h = h->next) {
fwrite(h->key, 1, h->key_length, stream);
fwrite(": ", 1, 2, stream);
fwrite(h->value, 1, h->value_length, stream);
fwrite("\r\n", 1, 2, stream);
dprintf(fileno(stream), "HTTP/1.1 %d %s\r\n", resp->status,
status_code_to_message(resp->status, NULL));
dprintf(fileno(stream), "Content-Length: %zu\r\n", resp->body_length);
for (HTTPHeaderList* h = resp->headers; h; h = h->next) {
write(fileno(stream), h->key, h->key_length);
write(fileno(stream), ": ", 2);
write(fileno(stream), h->value, h->value_length);
write(fileno(stream), "\r\n", 2);
}
fwrite("\r\n", 1, 2, stream);
write(fileno(stream), "\r\n", 2);
}
main.c
+79 -42
View File
@@ -16,10 +16,12 @@
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <unistd.h>
@@ -28,7 +30,7 @@ typedef struct {
bool help_flag;
uint32_t port;
size_t parallelism;
const char *address;
const char* address;
} GlobalFlags;
static const GlobalFlags DEFAULT_FLAGS = {
@@ -40,7 +42,8 @@ static const GlobalFlags DEFAULT_FLAGS = {
};
// Return false on failure, true on success
static bool parse_uint(const char *str, uintmax_t min, uintmax_t max, uintmax_t *output) {
static bool parse_uint(const char* str, uintmax_t min, uintmax_t max, uintmax_t* output)
{
if (isspace(*str) || *str == '+' || *str == '-') {
#ifdef BAD_ERROR_REPORTING_FOR_AUTOGRADER
fprintf(stderr, "Invalid Port\n");
@@ -50,7 +53,7 @@ static bool parse_uint(const char *str, uintmax_t min, uintmax_t max, uintmax_t
return false;
}
errno = 0;
char *endptr;
char* endptr;
uintmax_t conv = strtoumax(str, &endptr, 10);
if (!*str || *endptr) {
#ifdef BAD_ERROR_REPORTING_FOR_AUTOGRADER
@@ -71,13 +74,14 @@ static bool parse_uint(const char *str, uintmax_t min, uintmax_t max, uintmax_t
return true;
}
static void parse_cli_options(int argc, const char **argv, GlobalFlags *flags) {
static void parse_cli_options(int argc, const char** argv, GlobalFlags* flags)
{
#define MAX_PARALLELISM SIZE_MAX
#define MAX_PORT 65535
#define MAX_PORT 65535
opterr = false;
int c;
char pretty_flag[8];
while ((c = getopt(argc, (char *const *) argv, ":ha:p:")) >= 0) {
while ((c = getopt(argc, (char* const*)argv, ":ha:p:")) >= 0) {
if (isprint(c)) {
snprintf(pretty_flag, sizeof(pretty_flag), "%c", optopt);
} else {
@@ -89,7 +93,9 @@ static void parse_cli_options(int argc, const char **argv, GlobalFlags *flags) {
#pragma GCC diagnostic pop
}
switch (c) {
case 'h': flags->help_flag = true; return;
case 'h':
flags->help_flag = true;
return;
case 'p': {
uintmax_t conv;
if (!parse_uint(optarg, 1, MAX_PARALLELISM, &conv)) {
@@ -97,7 +103,9 @@ static void parse_cli_options(int argc, const char **argv, GlobalFlags *flags) {
}
flags->parallelism = conv;
} break;
case 'a': flags->address = optarg; break;
case 'a':
flags->address = optarg;
break;
case ':':
flags->opt_error = true;
log_error("flag requires argument: '%s'", pretty_flag);
@@ -124,7 +132,8 @@ static void parse_cli_options(int argc, const char **argv, GlobalFlags *flags) {
}
}
static void print_help(FILE *file) {
static void print_help(FILE* file)
{
fprintf(file, "usage: httpserver [-h] [-a ADDRESS] [-p PARALLELISM] <PORT>\n");
fprintf(file, " -h print this message, then exit\n");
fprintf(file, " -p use PARALLELISM threads for processing requests (default: 1)\n");
@@ -135,14 +144,25 @@ static const int WORKER_BLOCKED_SIGNALS[] = { SIGTERM, SIGINT, SIGHUP };
static const size_t N_WORKER_BLOCKED_SIGNALS = sizeof(WORKER_BLOCKED_SIGNALS) / sizeof(int);
static bool shutdown_flag = false;
static void signal_handler(int signal) {
static void signal_handler(int signal)
{
if (shutdown_flag) {
_exit(signal == SIGTERM ? 0 : EXIT_FAILURE);
}
shutdown_flag = true;
}
static void setup_signals() {
static void setup_signals()
{
struct sigaction pipe_act = {
.sa_flags = 0,
.sa_handler = SIG_IGN,
};
sigemptyset(&pipe_act.sa_mask);
if (sigaction(SIGPIPE, &pipe_act, NULL) < 0) {
log_errno("sigaction");
exit(EXIT_FAILURE);
}
struct sigaction act = {
.sa_handler = signal_handler,
.sa_flags = 0,
@@ -156,40 +176,51 @@ static void setup_signals() {
}
}
static int parse_result_to_status(HTTPRequestParseResult res) {
static int parse_result_to_status(HTTPRequestParseResult res)
{
switch (res) {
case HRPR_OK: return 200;
case HRPR_OK:
return 200;
case HRPR_NO_MEM:
case HRPR_READ_FAILED: return 500;
case HRPR_BAD_VERSION: return 505;
case HRPR_BAD_FORMAT: return 400;
default: abort();
case HRPR_READ_FAILED:
return 500;
case HRPR_BAD_VERSION:
return 505;
case HRPR_BAD_FORMAT:
return 400;
default:
abort();
}
}
static void send_simple_response(FILE *stream, int status) {
static void send_simple_response(FILE* stream, int status)
{
size_t status_msg_len;
const char *status_msg = status_code_to_message(status, &status_msg_len);
const char* status_msg = status_code_to_message(status, &status_msg_len);
HTTPResponse resp = {
.status = status,
.headers = NULL,
.body_length = status_msg_len + 1,
};
format_http_response(stream, &resp);
fwrite(status_msg, 1, status_msg_len, stream);
fputc('\n', stream);
write(fileno(stream), status_msg, status_msg_len);
write(fileno(stream), "\n", 1);
}
static void write_audit_log_entry(HTTPRequest *restrict req, int status) {
static void write_audit_log_entry(HTTPRequest* restrict req, int status)
{
fprintf(stderr, "%s,%s,%d,%s\n", req->method, req->uri, status,
http_header_list_search(req->headers, "Request-ID", "0"));
}
static void handle_get_request(FILE *conn, HTTPRequest *restrict req) {
static pthread_mutex_t file_access_mutex = PTHREAD_MUTEX_INITIALIZER;
static void handle_get_request(FILE* conn, HTTPRequest* restrict req)
{
int status = 200;
struct stat statbuf;
flockfile(stderr);
FILE *file_handle = fopen(req->path, "r");
pthread_mutex_lock(&file_access_mutex);
FILE* file_handle = fopen(req->path, "r");
if (!file_handle) {
if (errno == ENOENT) {
status = 404;
@@ -203,7 +234,7 @@ static void handle_get_request(FILE *conn, HTTPRequest *restrict req) {
status = errno == EACCES ? 403 : 500;
}
write_audit_log_entry(req, status);
funlockfile(stderr);
pthread_mutex_unlock(&file_access_mutex);
if (status != 200) {
if (file_handle) {
fclose(file_handle);
@@ -225,20 +256,21 @@ static void handle_get_request(FILE *conn, HTTPRequest *restrict req) {
}
size_t count = fread(read_buf, 1, sizeof(read_buf), file_handle);
if (count) {
fwrite(read_buf, 1, count, conn);
write(fileno(conn), read_buf, count);
}
}
fclose(file_handle);
}
static ssize_t get_content_length(HTTPRequest *restrict req) {
const char *text = http_header_list_search(req->headers, "Content-Length", NULL);
static ssize_t get_content_length(HTTPRequest* restrict req)
{
const char* text = http_header_list_search(req->headers, "Content-Length", NULL);
if (!text) {
return 0;
} else if (isspace(*text) || *text == '-' || *text == '+') {
return -1;
}
char *endptr;
char* endptr;
uintmax_t conv = strtoumax(text, &endptr, 10);
if (*endptr || (conv == UINTMAX_MAX && errno == ERANGE) || conv > SIZE_MAX) {
return -1;
@@ -246,7 +278,8 @@ static ssize_t get_content_length(HTTPRequest *restrict req) {
return conv;
}
static void handle_put_request(FILE *conn, HTTPRequest *restrict req) {
static void handle_put_request(FILE* conn, HTTPRequest* restrict req)
{
ssize_t content_length = get_content_length(req);
if (content_length < 0) {
write_audit_log_entry(req, 400);
@@ -264,8 +297,8 @@ static void handle_put_request(FILE *conn, HTTPRequest *restrict req) {
char read_buff[4096];
while (content_length) {
ssize_t read_size = fread(read_buff, 1,
(size_t) content_length < sizeof(read_buff) ? (size_t) content_length
: sizeof(read_buff),
(size_t)content_length < sizeof(read_buff) ? (size_t)content_length
: sizeof(read_buff),
conn);
if (ferror(conn) || write(temp_fd, read_buff, read_size) < 0) {
write_audit_log_entry(req, 500);
@@ -279,7 +312,7 @@ static void handle_put_request(FILE *conn, HTTPRequest *restrict req) {
close(temp_fd);
int status;
bool need_unlink = true;
flockfile(stderr);
pthread_mutex_lock(&file_access_mutex);
int creat_fd = open(req->path, O_RDONLY | O_CREAT | O_EXCL, 0644);
if (creat_fd < 0 && errno == EEXIST) {
// file existed
@@ -300,15 +333,16 @@ static void handle_put_request(FILE *conn, HTTPRequest *restrict req) {
need_unlink = false;
write_status_and_unlock:
write_audit_log_entry(req, status);
funlockfile(stderr);
pthread_mutex_unlock(&file_access_mutex);
send_simple_response(conn, status);
if (need_unlink) {
unlink(temp_file);
}
}
static void handle_connection(void *arg) {
FILE *conn = arg;
static void handle_connection(void* arg)
{
FILE* conn = arg;
HTTPRequest req;
HTTPRequestParseResult res = parse_http_request(conn, &req);
if (res != HRPR_OK) {
@@ -327,14 +361,17 @@ static void handle_connection(void *arg) {
send_simple_response(conn, 501);
}
free_http_request(&req);
shutdown(fileno(conn), SHUT_RDWR);
fclose(conn);
}
static void fclose_free_func(void *file) {
static void fclose_free_func(void* file)
{
fclose(file);
}
int main(int argc, const char **argv) {
int main(int argc, const char** argv)
{
setenv("POSIXLY_CORRECT", "1", true);
GlobalFlags flags = DEFAULT_FLAGS;
parse_cli_options(argc, argv, &flags);
@@ -349,11 +386,11 @@ int main(int argc, const char **argv) {
for (size_t i = 0; i < N_WORKER_BLOCKED_SIGNALS; ++i) {
sigaddset(&worker_block_set, WORKER_BLOCKED_SIGNALS[i]);
}
Server *server = make_server(flags.address, flags.port);
Server* server = make_server(flags.address, flags.port);
if (!server) {
return EXIT_FAILURE;
}
ThreadPool *pool = make_thread_pool(flags.parallelism, worker_block_set);
ThreadPool* pool = make_thread_pool(flags.parallelism, worker_block_set);
if (!pool) {
destroy_server(server);
return EXIT_FAILURE;
@@ -369,7 +406,7 @@ int main(int argc, const char **argv) {
} else if (conn_fd < 0) {
continue;
}
FILE *conn = fdopen(conn_fd, "w+");
FILE* conn = fdopen(conn_fd, "r+");
if (!conn) {
close(conn_fd);
continue;