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
+27 -17
View File
@@ -7,7 +7,8 @@
static const char* EMPTY_STRING = ""; static const char* EMPTY_STRING = "";
HTTPHeaderList *http_header_list_push(HTTPHeaderList *list, const char *key, const char *value) { HTTPHeaderList* http_header_list_push(HTTPHeaderList* list, const char* key, const char* value)
{
HTTPHeaderList* new = malloc(sizeof(HTTPHeaderList)); HTTPHeaderList* new = malloc(sizeof(HTTPHeaderList));
if (!new) { if (!new) {
return NULL; return NULL;
@@ -31,7 +32,8 @@ HTTPHeaderList *http_header_list_push(HTTPHeaderList *list, const char *key, con
return new; return new;
} }
void free_http_header_list(HTTPHeaderList *list) { void free_http_header_list(HTTPHeaderList* list)
{
while (list) { while (list) {
HTTPHeaderList* next = list->next; HTTPHeaderList* next = list->next;
free(list->key); free(list->key);
@@ -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) { while (list) {
if (strcmp(list->key, key) == 0) { if (strcmp(list->key, key) == 0) {
return list->value; return list->value;
@@ -65,7 +68,8 @@ const char *http_header_list_search(HTTPHeaderList *list, const char *key, const
// if an error occured, req->uri is not allocated // if an error occured, req->uri is not allocated
static HTTPRequestParseResult parse_method_uri_line( 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 // allow for some leeway in passing incorrect methods
char method[MAX_METHOD_LENGTH + 1]; char method[MAX_METHOD_LENGTH + 1];
char uri[MAX_URI_LENGTH + 1]; char uri[MAX_URI_LENGTH + 1];
@@ -110,7 +114,8 @@ static HTTPRequestParseResult parse_method_uri_line(
// return true if there are more headers and no error occurred, false otherwise // return true if there are more headers and no error occurred, false otherwise
// this will *not* free LIST if an error occurs // this will *not* free LIST if an error occurs
static bool next_header(FILE* stream, size_t* restrict bytes_read, static bool next_header(FILE* stream, size_t* restrict bytes_read,
HTTPRequestParseResult *restrict res, HTTPHeaderList *restrict *restrict list) { HTTPRequestParseResult* restrict res, HTTPHeaderList* restrict* restrict list)
{
char c = fgetc(stream); char c = fgetc(stream);
RETURN_IF_READ_ERROR(stream); RETURN_IF_READ_ERROR(stream);
if (c == '\r') { if (c == '\r') {
@@ -154,16 +159,17 @@ static bool next_header(FILE *stream, size_t *restrict bytes_read,
return true; 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->uri = EMPTY_STRING;
out->path = EMPTY_STRING; out->path = EMPTY_STRING;
out->method = EMPTY_STRING; out->method = EMPTY_STRING;
out->headers = NULL;
size_t total_bytes; size_t total_bytes;
HTTPRequestParseResult res; HTTPRequestParseResult res;
if ((res = parse_method_uri_line(stream, &total_bytes, out)) != HRPR_OK) { if ((res = parse_method_uri_line(stream, &total_bytes, out)) != HRPR_OK) {
return res; return res;
} }
out->headers = NULL;
size_t bytes_read; size_t bytes_read;
while (next_header(stream, &bytes_read, &res, &out->headers)) { while (next_header(stream, &bytes_read, &res, &out->headers)) {
if ((total_bytes += bytes_read) > MAX_REQUEST_LENGTH) { if ((total_bytes += bytes_read) > MAX_REQUEST_LENGTH) {
@@ -174,7 +180,8 @@ HTTPRequestParseResult parse_http_request(FILE *stream, HTTPRequest *restrict ou
return res; return res;
} }
void free_http_request(HTTPRequest *restrict req) { void free_http_request(HTTPRequest* restrict req)
{
if (req->method != EMPTY_STRING) { if (req->method != EMPTY_STRING) {
free((char*)req->method); free((char*)req->method);
} }
@@ -184,7 +191,8 @@ void free_http_request(HTTPRequest *restrict req) {
free_http_header_list(req->headers); 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 { static const struct {
int code; int code;
const char* msg; const char* msg;
@@ -213,15 +221,17 @@ const char *status_code_to_message(int status, size_t *restrict length) {
return NULL; 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)); 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)); dprintf(fileno(stream), "HTTP/1.1 %d %s\r\n", resp->status,
fprintf(stream, "Content-Length: %zu\r\n", resp->body_length); 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) { for (HTTPHeaderList* h = resp->headers; h; h = h->next) {
fwrite(h->key, 1, h->key_length, stream); write(fileno(stream), h->key, h->key_length);
fwrite(": ", 1, 2, stream); write(fileno(stream), ": ", 2);
fwrite(h->value, 1, h->value_length, stream); write(fileno(stream), h->value, h->value_length);
fwrite("\r\n", 1, 2, stream); write(fileno(stream), "\r\n", 2);
} }
fwrite("\r\n", 1, 2, stream); write(fileno(stream), "\r\n", 2);
} }
main.c
+66 -29
View File
@@ -16,10 +16,12 @@
#include <errno.h> #include <errno.h>
#include <fcntl.h> #include <fcntl.h>
#include <inttypes.h> #include <inttypes.h>
#include <pthread.h>
#include <signal.h> #include <signal.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <string.h> #include <string.h>
#include <sys/socket.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <unistd.h> #include <unistd.h>
@@ -40,7 +42,8 @@ static const GlobalFlags DEFAULT_FLAGS = {
}; };
// Return false on failure, true on success // 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 == '-') { if (isspace(*str) || *str == '+' || *str == '-') {
#ifdef BAD_ERROR_REPORTING_FOR_AUTOGRADER #ifdef BAD_ERROR_REPORTING_FOR_AUTOGRADER
fprintf(stderr, "Invalid Port\n"); fprintf(stderr, "Invalid Port\n");
@@ -71,7 +74,8 @@ static bool parse_uint(const char *str, uintmax_t min, uintmax_t max, uintmax_t
return true; 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_PARALLELISM SIZE_MAX
#define MAX_PORT 65535 #define MAX_PORT 65535
opterr = false; opterr = false;
@@ -89,7 +93,9 @@ static void parse_cli_options(int argc, const char **argv, GlobalFlags *flags) {
#pragma GCC diagnostic pop #pragma GCC diagnostic pop
} }
switch (c) { switch (c) {
case 'h': flags->help_flag = true; return; case 'h':
flags->help_flag = true;
return;
case 'p': { case 'p': {
uintmax_t conv; uintmax_t conv;
if (!parse_uint(optarg, 1, MAX_PARALLELISM, &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; flags->parallelism = conv;
} break; } break;
case 'a': flags->address = optarg; break; case 'a':
flags->address = optarg;
break;
case ':': case ':':
flags->opt_error = true; flags->opt_error = true;
log_error("flag requires argument: '%s'", pretty_flag); 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, "usage: httpserver [-h] [-a ADDRESS] [-p PARALLELISM] <PORT>\n");
fprintf(file, " -h print this message, then exit\n"); fprintf(file, " -h print this message, then exit\n");
fprintf(file, " -p use PARALLELISM threads for processing requests (default: 1)\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 const size_t N_WORKER_BLOCKED_SIGNALS = sizeof(WORKER_BLOCKED_SIGNALS) / sizeof(int);
static bool shutdown_flag = false; static bool shutdown_flag = false;
static void signal_handler(int signal) { static void signal_handler(int signal)
{
if (shutdown_flag) { if (shutdown_flag) {
_exit(signal == SIGTERM ? 0 : EXIT_FAILURE); _exit(signal == SIGTERM ? 0 : EXIT_FAILURE);
} }
shutdown_flag = true; 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 = { struct sigaction act = {
.sa_handler = signal_handler, .sa_handler = signal_handler,
.sa_flags = 0, .sa_flags = 0,
@@ -156,18 +176,25 @@ static void setup_signals() {
} }
} }
static int parse_result_to_status(HTTPRequestParseResult res) { static int parse_result_to_status(HTTPRequestParseResult res)
{
switch (res) { switch (res) {
case HRPR_OK: return 200; case HRPR_OK:
return 200;
case HRPR_NO_MEM: case HRPR_NO_MEM:
case HRPR_READ_FAILED: return 500; case HRPR_READ_FAILED:
case HRPR_BAD_VERSION: return 505; return 500;
case HRPR_BAD_FORMAT: return 400; case HRPR_BAD_VERSION:
default: abort(); 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; 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 = { HTTPResponse resp = {
@@ -176,19 +203,23 @@ static void send_simple_response(FILE *stream, int status) {
.body_length = status_msg_len + 1, .body_length = status_msg_len + 1,
}; };
format_http_response(stream, &resp); format_http_response(stream, &resp);
fwrite(status_msg, 1, status_msg_len, stream); write(fileno(stream), status_msg, status_msg_len);
fputc('\n', stream); 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, fprintf(stderr, "%s,%s,%d,%s\n", req->method, req->uri, status,
http_header_list_search(req->headers, "Request-ID", "0")); 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; int status = 200;
struct stat statbuf; struct stat statbuf;
flockfile(stderr); pthread_mutex_lock(&file_access_mutex);
FILE* file_handle = fopen(req->path, "r"); FILE* file_handle = fopen(req->path, "r");
if (!file_handle) { if (!file_handle) {
if (errno == ENOENT) { if (errno == ENOENT) {
@@ -203,7 +234,7 @@ static void handle_get_request(FILE *conn, HTTPRequest *restrict req) {
status = errno == EACCES ? 403 : 500; status = errno == EACCES ? 403 : 500;
} }
write_audit_log_entry(req, status); write_audit_log_entry(req, status);
funlockfile(stderr); pthread_mutex_unlock(&file_access_mutex);
if (status != 200) { if (status != 200) {
if (file_handle) { if (file_handle) {
fclose(file_handle); fclose(file_handle);
@@ -225,13 +256,14 @@ static void handle_get_request(FILE *conn, HTTPRequest *restrict req) {
} }
size_t count = fread(read_buf, 1, sizeof(read_buf), file_handle); size_t count = fread(read_buf, 1, sizeof(read_buf), file_handle);
if (count) { if (count) {
fwrite(read_buf, 1, count, conn); write(fileno(conn), read_buf, count);
} }
} }
fclose(file_handle); fclose(file_handle);
} }
static ssize_t get_content_length(HTTPRequest *restrict req) { static ssize_t get_content_length(HTTPRequest* restrict req)
{
const char* text = http_header_list_search(req->headers, "Content-Length", NULL); const char* text = http_header_list_search(req->headers, "Content-Length", NULL);
if (!text) { if (!text) {
return 0; return 0;
@@ -246,7 +278,8 @@ static ssize_t get_content_length(HTTPRequest *restrict req) {
return conv; 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); ssize_t content_length = get_content_length(req);
if (content_length < 0) { if (content_length < 0) {
write_audit_log_entry(req, 400); write_audit_log_entry(req, 400);
@@ -279,7 +312,7 @@ static void handle_put_request(FILE *conn, HTTPRequest *restrict req) {
close(temp_fd); close(temp_fd);
int status; int status;
bool need_unlink = true; 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); int creat_fd = open(req->path, O_RDONLY | O_CREAT | O_EXCL, 0644);
if (creat_fd < 0 && errno == EEXIST) { if (creat_fd < 0 && errno == EEXIST) {
// file existed // file existed
@@ -300,14 +333,15 @@ static void handle_put_request(FILE *conn, HTTPRequest *restrict req) {
need_unlink = false; need_unlink = false;
write_status_and_unlock: write_status_and_unlock:
write_audit_log_entry(req, status); write_audit_log_entry(req, status);
funlockfile(stderr); pthread_mutex_unlock(&file_access_mutex);
send_simple_response(conn, status); send_simple_response(conn, status);
if (need_unlink) { if (need_unlink) {
unlink(temp_file); unlink(temp_file);
} }
} }
static void handle_connection(void *arg) { static void handle_connection(void* arg)
{
FILE* conn = arg; FILE* conn = arg;
HTTPRequest req; HTTPRequest req;
HTTPRequestParseResult res = parse_http_request(conn, &req); HTTPRequestParseResult res = parse_http_request(conn, &req);
@@ -327,14 +361,17 @@ static void handle_connection(void *arg) {
send_simple_response(conn, 501); send_simple_response(conn, 501);
} }
free_http_request(&req); free_http_request(&req);
shutdown(fileno(conn), SHUT_RDWR);
fclose(conn); fclose(conn);
} }
static void fclose_free_func(void *file) { static void fclose_free_func(void* file)
{
fclose(file); fclose(file);
} }
int main(int argc, const char **argv) { int main(int argc, const char** argv)
{
setenv("POSIXLY_CORRECT", "1", true); setenv("POSIXLY_CORRECT", "1", true);
GlobalFlags flags = DEFAULT_FLAGS; GlobalFlags flags = DEFAULT_FLAGS;
parse_cli_options(argc, argv, &flags); parse_cli_options(argc, argv, &flags);
@@ -369,7 +406,7 @@ int main(int argc, const char **argv) {
} else if (conn_fd < 0) { } else if (conn_fd < 0) {
continue; continue;
} }
FILE *conn = fdopen(conn_fd, "w+"); FILE* conn = fdopen(conn_fd, "r+");
if (!conn) { if (!conn) {
close(conn_fd); close(conn_fd);
continue; continue;