#include <sys/sendfile.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <arpa/inet.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <pthread.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <stdio.h>
#include <time.h>
/* Default values */
#define MAX_FAILURE_COUNT 30
#define PORT 8080
#define THREAD_COUNT 10
#define BIND_ADDR "::"
/* Arguments for worker threads */
struct filed_worker_thread_args {
int fd;
};
/* File information */
struct filed_fileinfo {
int fd;
size_t len;
char *lastmod;
char lastmod_b[64];
char *type;
};
/* Initialize process */
static void filed_init(void) {
mlockall(MCL_CURRENT | MCL_FUTURE);
}
/* Listen on a particular address/port */
static int filed_listen(const char *address, unsigned int port) {
struct sockaddr_in6 addr;
int pton_ret, bind_ret, listen_ret;
int fd;
addr.sin6_family = AF_INET6;
addr.sin6_flowinfo = 0;
addr.sin6_scope_id = 0;
addr.sin6_port = htons(port);
pton_ret = inet_pton(AF_INET6, address, addr.sin6_addr.s6_addr);
if (pton_ret != 1) {
return(-1);
}
fd = socket(AF_INET6, SOCK_STREAM, 0);
if (fd < 0) {
return(fd);
}
bind_ret = bind(fd, (const struct sockaddr *) &addr, sizeof(addr));
if (bind_ret < 0) {
close(fd);
return(-1);
}
listen_ret = listen(fd, 128);
if (listen_ret != 0) {
close(fd);
return(-1);
}
return(fd);
}
/* Initialize logging thread */
static int filed_logging_thread_init(void) {
/* XXX:TODO: Unimplemented */
return(0);
}
/* Log a message */
static void filed_log_msg(const char *buffer) {
/* XXX:TODO: Unimplemented */
buffer = buffer;
return;
}
/* Format time per RFC2616 */
static char *filed_format_time(char *buffer, size_t buffer_len, const time_t timeinfo) {
struct tm timeinfo_tm, *timeinfo_tm_p;
timeinfo_tm_p = gmtime_r(&timeinfo, &timeinfo_tm);
if (timeinfo_tm_p == NULL) {
return("unknown");
}
buffer[buffer_len - 1] = '\0';
buffer_len = strftime(buffer, buffer_len - 1, "%a, %d %b %Y %H:%M:%S GMT", timeinfo_tm_p);
return(buffer);
}
/* Open a file and return file information */
static struct filed_fileinfo *filed_open_file(const char *path, struct filed_fileinfo *buffer) {
/* XXX:TODO: Cache file descriptors */
off_t len;
int fd;
fd = open(path, O_RDONLY);
if (fd < 0) {
return(NULL);
}
len = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
buffer->fd = fd;
buffer->len = len;
/* XXX:TODO: Determine */
buffer->type = "text/plain";
buffer->lastmod = filed_format_time(buffer->lastmod_b, sizeof(buffer->lastmod_b), time(NULL) - 30);
return(buffer);
}
/* Process an HTTP request and return the path requested */
static char *filed_get_http_request(FILE *fp, char *buffer, size_t buffer_len) {
char *method, *path;
char tmpbuf[1010];
int i;
filed_log_msg("WAIT_FOR_REQUEST FD=...");
fgets(buffer, buffer_len, fp);
method = buffer;
buffer = strchr(buffer, ' ');
if (buffer == NULL) {
filed_log_msg("GOT_REQUEST FD=... ERROR=format");
return(NULL);
}
*buffer = '\0';
buffer++;
path = buffer;
buffer = strchr(buffer, ' ');
if (buffer != NULL) {
*buffer = '\0';
buffer++;
}
filed_log_msg("GOT_REQUEST FD=... PATH=...");
filed_log_msg("WAIT_FOR_HEADERS FD=...");
for (i = 0; i < 100; i++) {
fgets(tmpbuf, sizeof(tmpbuf), fp);
if (memcmp(tmpbuf, "\r\n", 2) == 0) {
break;
}
}
filed_log_msg("GOT_HEADERS FD=...");
fflush(fp);
/* We only handle the "GET" method */
if (strcasecmp(method, "get") != 0) {
return(NULL);
}
return(path);
}
/* Return an error page */
static void filed_error_page(FILE *fp, const char *date_current, int error_number) {
char *error_string = "ERROR";
fprintf(fp, "HTTP/1.1 %i OK\r\nDate: %s\r\nServer: filed\r\nLast-Modified: %s\r\nContent-Length: %llu\r\nContent-Type: %s\r\nConnection: close\r\n\r\n%s",
error_number,
date_current,
date_current,
(unsigned long long) strlen(error_string),
"text/html",
error_string
);
}
/* Handle a single request from a client */
static void filed_handle_client(int fd) {
struct filed_fileinfo *fileinfo, fileinfo_b;
ssize_t sendfile_ret;
char *path, path_b[1010];
char *date_current, date_current_b[64];
FILE *fp;
/* Determine current time */
date_current = filed_format_time(date_current_b, sizeof(date_current_b), time(NULL));
/* Open socket as ANSI I/O for ease of use */
fp = fdopen(fd, "w+b");
if (fp == NULL) {
close(fd);
return;
}
path = filed_get_http_request(fp, path_b, sizeof(path_b));
filed_log_msg("PROCESS_REPLY_START FD=... PATH=...");
if (path == NULL) {
filed_error_page(fp, date_current, 500);
filed_log_msg("PROCESS_REPLY_COMPLETE FD=... ERROR=500");
fclose(fp);
return;
}
fileinfo = filed_open_file(path, &fileinfo_b);
if (fileinfo == NULL) {
filed_error_page(fp, date_current, 404);
filed_log_msg("PROCESS_REPLY_COMPLETE FD=... ERROR=404");
} else {
fprintf(fp, "HTTP/1.1 200 OK\r\nDate: %s\r\nServer: filed\r\nLast-Modified: %s\r\nContent-Length: %llu\r\nContent-Type: %s\r\nConnection: close\r\n\r\n",
date_current,
fileinfo->lastmod,
(unsigned long long) fileinfo->len,
fileinfo->type
);
fflush(fp);
filed_log_msg("PROCESS_REPLY_COMPLETE FD=... STATUS=200");
filed_log_msg("SEND_START IFD=... OFD=... BYTES=...");
sendfile_ret = sendfile(fd, fileinfo->fd, NULL, fileinfo->len);
if (sendfile_ret < 0 || ((size_t) sendfile_ret) != fileinfo->len) {
filed_log_msg("SEND_COMPLETE STATUS=ERROR IFD=... OFD=... BYTES=... BYTES_SENT=...");
} else {
filed_log_msg("SEND_COMPLETE STATUS=OK IFD=... OFD=... BYTES=...");
}
close(fileinfo->fd);
filed_log_msg("CLOSE_FILE FD=...");
}
filed_log_msg("CLOSE_CONNECTION FD=...");
fclose(fp);
return;
}
/* Handle incoming connections */
static void *filed_worker_thread(void *arg_v) {
struct filed_worker_thread_args *arg;
struct sockaddr_in6 addr;
socklen_t addrlen;
int failure_count = 0, max_failure_count = MAX_FAILURE_COUNT;
int master_fd, fd;
/* Read arguments */
arg = arg_v;
master_fd = arg->fd;
while (1) {
/* Failure loop prevention */
if (failure_count > max_failure_count) {
break;
}
/* Accept a new client */
addrlen = sizeof(addr);
fd = accept(master_fd, (struct sockaddr *) &addr, &addrlen);
/*
* If we fail, make a note of it so we don't go into a loop of
* accept() failing
*/
if (fd < 0) {
/* Log the new connection */
filed_log_msg("ACCEPT_FAILED");
failure_count++;
continue;
}
/* Log the new connection */
filed_log_msg("NEW_CONNECTION SRC_ADDR=... SRC_PORT=... FD=...");
/* Reset failure count*/
failure_count = 0;
/* Handle socket */
filed_handle_client(fd);
}
/* XXX:TODO: Report error */
return(NULL);
}
/* Create worker threads */
static int filed_worker_threads_init(int fd, int thread_count) {
struct filed_worker_thread_args *arg;
pthread_t threadid;
int pthread_ret;
int i;
for (i = 0; i < thread_count; i++) {
arg = malloc(sizeof(*arg));
arg->fd = fd;
pthread_ret = pthread_create(&threadid, NULL, filed_worker_thread, arg);
if (pthread_ret != 0) {
return(-1);
}
}
return(0);
}
/* Run process */
int main(int argc, char **argv) {
int port = PORT, thread_count = THREAD_COUNT;
const char *bind_addr = BIND_ADDR;
int fd;
/* Ignore */
argc = argc;
argv = argv;
/* Create listening socket */
fd = filed_listen(bind_addr, port);
if (fd < 0) {
perror("filed_listen");
return(1);
}
/* Become a daemon */
/* XXX:TODO: Become a daemon */
/* Initialize */
filed_init();
/* Create logging thread */
/* XXX:TODO: Check for errors */
filed_logging_thread_init();
/* Create worker threads */
/* XXX:TODO: Check for errors */
filed_worker_threads_init(fd, thread_count);
/* Wait for threads to exit */
/* XXX:TODO: Monitor thread usage */
while (1) {
sleep(60);
}
/* Return in failure */
return(2);
}