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/* b01902062 藍挺瑋 */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#define CHTTPD_SERVER_ENABLE_ERRMSG
#include "chttpd-conn.h"
#include "chttpd-log.h"
#include "chttpd-server.h"
#include <l4array.h>
#include <l4strv.h>
#include <l4list.h>
#include <l4str.h>
#include <l4posix.h>
#include <ctype.h>
#include <errno.h>
#include <pthread.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#define NL "\015\012"
enum {
HTTP_STATUS_200_OK,
HTTP_STATUS_400_BAD_REQUEST,
HTTP_STATUS_404_NOT_FOUND,
HTTP_STATUS_500_INTERNAL_SERVER_ERROR
};
static char* http_status_hdr[] = {
[HTTP_STATUS_200_OK] = "HTTP/1.1 200 OK" NL,
[HTTP_STATUS_400_BAD_REQUEST] = "HTTP/1.1 400 Bad Request" NL,
[HTTP_STATUS_404_NOT_FOUND] = "HTTP/1.1 404 Not Found" NL,
[HTTP_STATUS_500_INTERNAL_SERVER_ERROR] = "HTTP/1.1 500 Internal Server Error" NL
};
static char* http_status_msg[] = {
[HTTP_STATUS_400_BAD_REQUEST] =
"\n<html><head><title>400 Bad Request</title></head>" NL
"<body><p>You browser sent a broken HTTP request." NL
"<a href=\"http://tools.ietf.org/search/rfc2616#section-10.4.1\">"
"[400]</a></p>"
"</body></html>" NL
};
static inline void http_status_write (int connfd, int status_enum) {
lbs_posix_write_all (connfd, http_status_hdr[status_enum], 0);
lbs_posix_write_all (connfd, NL, 2);
lbs_posix_write_all (connfd, http_status_msg[status_enum], 0);
}
#define CHTTPD_CONN_THREAD_INIT \
ChttpdConn* conn = ptr_to_ChttpdConn; \
ChttpdServer* server = conn->server; \
ChttpdLog* hlog = conn->hlog; \
unsigned long long id = conn->id; \
int connfd = conn->connfd; \
pthread_sigmask (SIG_SETMASK, &server->conn_mask, NULL);
#define CHTTPD_CONN_THREAD_DESTROY \
chttpd_log_write (hlog, "[%4llu] terminated", conn->id); \
pthread_rwlock_wrlock (&server->lock); \
lbs_list_remove (server->conn, conn->conn_node); \
pthread_rwlock_unlock (&server->lock); \
return NULL
static inline char* internal_memstr (const void* haystack,
size_t haystacklen, const char* needle) {
const char* haychar = haystack;
bool matched;
for (size_t i = 0; i < haystacklen; i++, haychar++) {
matched = true;
for (size_t j = 0; needle[j] != '\0'; j++) {
if (i + j >= haystacklen || haychar[j] != needle[j]) {
matched = false;
break;
}
}
if (matched) {
return (char*)haychar;
}
}
return NULL;
}
#define ERRLEN 256
void* chttpd_conn_admin (void* ptr_to_ChttpdConn) {
CHTTPD_CONN_THREAD_INIT;
chttpd_log_write (hlog, "[%4llu] sorry, function not implemented", id);
chttpd_log_write (hlog, "[%4llu] fd is %d", connfd);
CHTTPD_CONN_THREAD_DESTROY;
}
void* chttpd_conn_http (void* ptr_to_ChttpdConn) {
CHTTPD_CONN_THREAD_INIT;
const char hdr_delim[] = "\015\012\015\012";
_Static_assert (LBS_STR_STATIC_STRLEN (hdr_delim) == 4,
"HTTP header delimiter length must be 4 bytes!");
const char line_delim[] = "\015\012";
_Static_assert (LBS_STR_STATIC_STRLEN (line_delim) == 2,
"HTTP line delimiter length must be 2bytes!");
char errmsg[ERRLEN];
LbsArray* hdr_buf = lbs_array_new (sizeof (char));
LbsArray* out_buf = lbs_array_new (sizeof (char));
size_t data_offset;
while (true) {
ssize_t r = read (connfd, conn->buf, CHTTPD_CONN_BUF_SIZE);
if (r < 0) {
if (errno == EINTR || errno == EAGAIN) {
continue;
}
chttpd_log_write (hlog, "[%4llu] incomplete header: read: %s",
id, get_errmsg (errno, errmsg, ERRLEN));
goto http_exit;
} else if (r == 0) {
chttpd_log_write (hlog, "[%4llu] incomplete header: premature EOF",
id);
goto http_exit;
}
const char* hdr_end = internal_memstr (conn->buf, r, hdr_delim);
if (hdr_end != NULL) {
data_offset = hdr_end - conn->buf;
lbs_array_append_mass (hdr_buf, conn->buf, data_offset);
lbs_array_append_data (hdr_buf, &(char){ '\0' });
data_offset += 4;
break;
} else {
lbs_array_append_mass (hdr_buf, conn->buf, r);
}
}
char* method_start = hdr_buf->data;
char* hdr_start = internal_memstr (hdr_buf->data, hdr_buf->len, line_delim);
if (hdr_start != NULL) {
*hdr_start = '\0';
hdr_start += 2;
}
chttpd_log_write (hlog, "[%4llu] client request: %s", id, method_start);
/* Parse method line */
char* tokstore;
char* ma1 = strtok_r (method_start, " \t", &tokstore);
if (ma1 == NULL) {
chttpd_log_write (hlog, "[%4llu] 400 Bad Request: URL not found", id);
http_status_write (connfd, HTTP_STATUS_400_BAD_REQUEST);
goto http_exit;
}
char* ma2 = strtok_r (NULL, " \t", &tokstore);
if (ma2 == NULL) {
chttpd_log_write (hlog, "[%4llu] 400 Bad Request: What?", id);
http_status_write (connfd, HTTP_STATUS_400_BAD_REQUEST);
goto http_exit;
} else {
if (*ma2 != '/') {
chttpd_log_write (hlog,
"[%4llu] 400 Bad Request: URL not started with /", id);
http_status_write (connfd, HTTP_STATUS_400_BAD_REQUEST);
goto http_exit;
}
}
char* ma3 = strtok_r (NULL, " \t", &tokstore);
char* request_method = ma1;
char* request_uri = ma2 + 1;
char* server_protocol = (ma3 == NULL) ? "" : ma3;
char* query_string = strtok_r (request_uri, "?", &tokstore);
query_string = (query_string == NULL) ? "" : query_string;
#ifdef SPHW_RESTRICTION
for (char* p = request_uri; *p != '\0'; p++) {
if (!(*p == '_' || isalnum (*p))) {
chttpd_log_write (hlog, "[%4llu] 400 Bad Request: character"
" `%c\' in request URI is not allowed", id, *p);
http_status_write (connfd, HTTP_STATUS_400_BAD_REQUEST);
goto http_exit;
}
}
for (char* p = query_string; *p != '\0'; p++) {
if (!(*p == '_' || *p == '=' || *p == '&' || isalnum (*p))) {
chttpd_log_write (hlog, "[%4llu] 400 Bad Request: character"
" `%c\' in query string is not allowed", id, *p);
http_status_write (connfd, HTTP_STATUS_400_BAD_REQUEST);
goto http_exit;
}
}
#endif
http_exit:
lbs_array_unref (hdr_buf);
lbs_array_unref (out_buf);
CHTTPD_CONN_THREAD_DESTROY;
}
#undef ERRLEN
void chttpd_conn_ctor (void* conn_generic, unsigned long long id, int connfd,
ChttpdLog* hlog, ChttpdServer* server, LbsListMeta* slist) {
ChttpdConn* conn = conn_generic;
conn->id = id;
conn->connfd = connfd;
conn->hlog = chttpd_log_ref (hlog);
conn->server = server;
conn->slist = slist;
pthread_rwlock_init (&conn->lock, NULL);
conn->pid = -1;
}
void chttpd_conn_dtor (void* conn_generic) {
ChttpdConn* conn = conn_generic;
close (conn->connfd);
chttpd_log_unref (conn->hlog);
pthread_rwlock_wrlock (&conn->lock);
pthread_rwlock_unlock (&conn->lock);
pthread_rwlock_destroy (&conn->lock);
free (conn);
}
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