#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 <sys/wait.h>
#include <pthread.h>
#include <strings.h>
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <getopt.h>
#include <stdarg.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <time.h>
#include <pwd.h>
/* Compile time constants */
#define FILED_VERSION "1.6"
#define FILED_SENDFILE_MAX 16777215
#define FILED_MAX_FAILURE_COUNT 30
#define FILED_DEFAULT_TYPE "application/octet-stream"
#define FILED_PATH_BUFFER_SIZE 1010
/* Default values */
#define PORT 80
#define THREAD_COUNT 5
#define BIND_ADDR "::"
#define CACHE_SIZE 8209
#define LOG_FILE "-"
/* Arguments for worker threads */
struct filed_worker_thread_args {
int fd;
};
/* Arguments for logging threads */
struct filed_logging_thread_args {
FILE *fp;
};
/* File information */
struct filed_fileinfo {
pthread_mutex_t mutex;
char path[FILED_PATH_BUFFER_SIZE];
int fd;
off_t len;
char *lastmod;
char lastmod_b[64];
const char *type;
char etag[64];
};
/* Request variables */
struct filed_http_request {
/** Buffers **/
struct filed_fileinfo fileinfo;
char tmpbuf[1010];
/** HTTP Request information **/
/*** Type of request (HEAD or GET) ***/
enum {
FILED_REQUEST_METHOD_GET,
FILED_REQUEST_METHOD_HEAD
} method;
/*** Path being requested ***/
char path[FILED_PATH_BUFFER_SIZE];
struct {
struct {
int present;
off_t offset; /*** Range start ***/
off_t length; /*** Range length ***/
} range;
} headers;
};
/* Log record */
struct filed_log_entry {
/* Type of log entry */
enum {
FILED_LOG_TYPE_MESSAGE,
FILED_LOG_TYPE_TRANSFER
} type;
/* Linked list head/tail */
struct filed_log_entry *_next;
struct filed_log_entry *_prev;
/* Thread from which this log entry eminates */
pthread_t thread;
/* Message buffer for type = MESSAGE */
/* Path buffer for type = TRANSFER */
char buffer[FILED_PATH_BUFFER_SIZE];
/* Items for type = TRANSFER */
int http_code;
const char *reason;
time_t starttime;
time_t endtime;
off_t req_offset;
off_t req_length;
off_t sent_length;
off_t file_length;
char ip[128];
int port;
int method;
};
/* Global variables */
/** Open File cache **/
struct filed_fileinfo *filed_fileinfo_fdcache = NULL;
unsigned int filed_fileinfo_fdcache_size = 0;
/** Logging **/
struct filed_log_entry *filed_log_msg_list;
pthread_mutex_t filed_log_msg_list_mutex;
pthread_cond_t filed_log_msg_list_ready;
/* Initialize cache */
static int filed_init_cache(unsigned int cache_size) {
unsigned int idx;
int mutex_init_ret;
/* Cache may not be re-initialized */
if (filed_fileinfo_fdcache_size != 0 || filed_fileinfo_fdcache != NULL) {
return(1);
}
/* Allocate cache */
filed_fileinfo_fdcache_size = cache_size;
filed_fileinfo_fdcache = malloc(sizeof(*filed_fileinfo_fdcache) * filed_fileinfo_fdcache_size);
if (filed_fileinfo_fdcache == NULL) {
return(1);
}
/* Initialize cache entries */
for (idx = 0; idx < filed_fileinfo_fdcache_size; idx++) {
mutex_init_ret = pthread_mutex_init(&filed_fileinfo_fdcache[idx].mutex, NULL);
if (mutex_init_ret != 0) {
return(1);
}
filed_fileinfo_fdcache[idx].path[0] = '\0';
filed_fileinfo_fdcache[idx].fd = -1;
filed_fileinfo_fdcache[idx].lastmod = "";
filed_fileinfo_fdcache[idx].type = "";
}
return(0);
}
/* Initialize process */
static int filed_init(unsigned int cache_size) {
static int called = 0;
unsigned int random_value = 0;
int cache_ret;
int random_fd;
if (called) {
return(0);
}
called = 1;
/* Attempt to lock all memory to physical RAM (but don't care if we can't) */
mlockall(MCL_CURRENT | MCL_FUTURE);
/* Ignore SIGPIPE */
signal(SIGPIPE, SIG_IGN);
/* Initialize cache structure */
cache_ret = filed_init_cache(cache_size);
if (cache_ret != 0) {
return(cache_ret);
}
/* Initialize random number generator */
random_fd = open("/dev/urandom", O_RDONLY);
if (random_fd >= 0) {
read(random_fd, &random_value, sizeof(random_value));
close(random_fd);
}
random_value ^= getpid();
random_value ^= getuid();
random_value ^= time(NULL);
srandom(random_value);
return(0);
}
/* Listen on a particular address/port */
static int filed_listen(const char *address, unsigned int port) {
struct sockaddr_in6 addr_v6;
struct sockaddr_in addr_v4;
struct sockaddr *addr;
socklen_t addr_len;
int pton_ret, bind_ret, listen_ret;
int family;
int fd;
family = AF_INET6;
pton_ret = inet_pton(family, address, &addr_v6.sin6_addr.s6_addr);
if (pton_ret != 1) {
family = AF_INET;
pton_ret = inet_pton(family, address, &addr_v4.sin_addr.s_addr);
if (pton_ret != 1) {
return(-1);
}
addr_v4.sin_family = family;
addr_v4.sin_port = htons(port);
addr = (struct sockaddr *) &addr_v4;
addr_len = sizeof(addr_v4);
} else {
addr_v6.sin6_family = AF_INET6;
addr_v6.sin6_flowinfo = 0;
addr_v6.sin6_scope_id = 0;
addr_v6.sin6_port = htons(port);
addr = (struct sockaddr *) &addr_v6;
addr_len = sizeof(addr_v6);
}
fd = socket(family, SOCK_STREAM, 0);
if (fd < 0) {
return(fd);
}
bind_ret = bind(fd, addr, addr_len);
if (bind_ret < 0) {
close(fd);
return(-1);
}
listen_ret = listen(fd, 128);
if (listen_ret != 0) {
close(fd);
return(-1);
}
return(fd);
}
/* Log a message */
#ifdef FILED_DONT_LOG
# define filed_logging_thread_init(x) 0
# define filed_log_msg_debug(x, ...) /**/
# define filed_log_msg(x, ...) /**/
# define filed_log_entry(x) /**/
# define filed_log_ip(x, ...) NULL
# define filed_log_new(x) &local_dummy_log
# define filed_log_open(x) stdout
#else
# ifdef FILED_DEBUG
# define filed_log_msg_debug(x, ...) { fprintf(stderr, x, __VA_ARGS__); fprintf(stderr, "\n"); fflush(stderr); }
# else
# define filed_log_msg_debug(x, ...) /**/
# endif
/* Initialize logging thread */
static void *filed_logging_thread(void *arg_p) {
struct filed_logging_thread_args *arg;
struct filed_log_entry *curr, *prev;
const char *method;
time_t now;
FILE *fp;
arg = arg_p;
fp = arg->fp;
while (1) {
pthread_mutex_lock(&filed_log_msg_list_mutex);
pthread_cond_wait(&filed_log_msg_list_ready, &filed_log_msg_list_mutex);
curr = filed_log_msg_list;
filed_log_msg_list = NULL;
pthread_mutex_unlock(&filed_log_msg_list_mutex);
now = time(NULL);
prev = NULL;
for (; curr; curr = curr->_next) {
curr->_prev = prev;
prev = curr;
}
curr = prev;
while (curr) {
switch (curr->type) {
case FILED_LOG_TYPE_MESSAGE:
fprintf(fp, "%s", curr->buffer);
break;
case FILED_LOG_TYPE_TRANSFER:
switch (curr->method) {
case FILED_REQUEST_METHOD_GET:
method="GET";
break;
case FILED_REQUEST_METHOD_HEAD:
method="HEAD";
break;
default:
method="<unknown>";
break;
}
if (curr->endtime == ((time_t) -1)) {
curr->endtime = now;
}
fprintf(fp, "TRANSFER METHOD=%s PATH=%s SRC=%s:%i TIME.START=%llu TIME.END=%llu CODE.VALUE=%u CODE.REASON=%s REQUEST.OFFSET=%llu REQUEST.LENGTH=%llu FILE.LENGTH=%llu TRANSFER.LENGTH=%llu",
method,
curr->buffer,
curr->ip, curr->port,
(unsigned long long) curr->starttime,
(unsigned long long) curr->endtime,
curr->http_code, curr->reason,
(unsigned long long) curr->req_offset,
(unsigned long long) curr->req_length,
(unsigned long long) curr->file_length,
(unsigned long long) curr->sent_length
);
break;
}
fprintf(fp, " THREAD=%llu TIME=%llu\n",
(unsigned long long) curr->thread,
(unsigned long long) now
);
fflush(fp);
prev = curr;
curr = curr->_prev;
free(prev);
}
}
return(NULL);
}
static void filed_log_entry(struct filed_log_entry *entry) {
entry->thread = pthread_self();
pthread_mutex_lock(&filed_log_msg_list_mutex);
entry->_next = filed_log_msg_list;
filed_log_msg_list = entry;
pthread_mutex_unlock(&filed_log_msg_list_mutex);
pthread_cond_signal(&filed_log_msg_list_ready);
return;
}
static struct filed_log_entry *filed_log_new(int initialize) {
struct filed_log_entry *retval;
retval = malloc(sizeof(*retval));
if (initialize) {
retval->buffer[0] = '\0';
retval->http_code = -1;
retval->starttime = 0;
retval->endtime = 0;
retval->req_offset = 0;
retval->req_length = 0;
retval->sent_length = 0;
retval->file_length = 0;
retval->ip[0] = '\0';
retval->port = -1;
retval->method = -1;
}
return(retval);
}
static void filed_log_msg(const char *fmt, ...) {
struct filed_log_entry *entry;
va_list args;
entry = filed_log_new(0);
va_start(args, fmt);
vsnprintf(entry->buffer, sizeof(entry->buffer), fmt, args);
va_end(args);
entry->type = FILED_LOG_TYPE_MESSAGE;
filed_log_entry(entry);
return;
}
static const char *filed_log_ip(struct sockaddr *addr, char *buffer, size_t bufferlen) {
struct sockaddr_in *addr_v4;
struct sockaddr_in6 *addr_v6;
const char *retval = NULL;
addr_v6 = (struct sockaddr_in6 *) addr;
switch (addr_v6->sin6_family) {
case AF_INET:
addr_v4 = (struct sockaddr_in *) addr;
retval = inet_ntop(AF_INET, &addr_v4->sin_addr, buffer, bufferlen);
break;
case AF_INET6:
retval = inet_ntop(AF_INET6, &addr_v6->sin6_addr, buffer, bufferlen);
break;
}
return(retval);
}
static FILE *filed_log_open(const char *file) {
FILE *retval;
if (strcmp(file, "-") == 0) {
retval = stdout;
} else if (file[0] == '|') {
file++;
retval = popen(file, "w");
} else {
retval = fopen(file, "a+");
}
return(retval);
}
static int filed_logging_thread_init(FILE *logfp) {
struct filed_logging_thread_args *args;
pthread_t thread_id;
args = malloc(sizeof(*args));
args->fp = logfp;
filed_log_msg_list = NULL;
pthread_mutex_init(&filed_log_msg_list_mutex, NULL);
pthread_create(&thread_id, NULL, filed_logging_thread, args);
filed_log_msg("START");
return(0);
}
#endif
/* 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);
}
/* hash */
static unsigned int filed_hash(const unsigned char *value, unsigned int modulus) {
unsigned char curr, prev;
int diff;
unsigned int retval;
retval = modulus - 1;
prev = modulus % 255;
while ((curr = *value)) {
if (curr < 32) {
curr = 255 - curr;
} else {
curr -= 32;
}
if (prev < curr) {
diff = curr - prev;
} else {
diff = prev - curr;
}
prev = curr;
retval <<= 3;
retval &= 0xFFFFFFFFLU;
retval ^= diff;
value++;
}
retval = retval % modulus;
return(retval);
}
/* Find a mime-type based on the filename */
static const char *filed_determine_mimetype(const char *path) {
const char *p;
p = strrchr(path, '.');
if (p == NULL) {
return(FILED_DEFAULT_TYPE);
}
p++;
if (*p == '\0') {
return(FILED_DEFAULT_TYPE);
}
filed_log_msg_debug("Looking up MIME type for %s (hash = %llu)", p, (unsigned long long) filed_hash((const unsigned char *) p, 16777259));
#include "filed-mime-types.h"
return(FILED_DEFAULT_TYPE);
}
/* Generate a unique identifier */
static void filed_generate_etag(char *etag, size_t length) {
snprintf(etag, length, "%llx-%llx%llx%llx%llx",
(unsigned long long) time(NULL),
(unsigned long long) random(),
(unsigned long long) random(),
(unsigned long long) random(),
(unsigned long long) random()
);
}
/* Open a file and return file information */
static struct filed_fileinfo *filed_open_file(const char *path, struct filed_fileinfo *buffer) {
struct filed_fileinfo *cache;
const char *open_path;
unsigned int cache_idx;
off_t len;
int fd;
cache_idx = filed_hash((const unsigned char *) path, filed_fileinfo_fdcache_size);
cache = &filed_fileinfo_fdcache[cache_idx];
filed_log_msg_debug("Locking mutex for idx: %lu", (unsigned long) cache_idx);
pthread_mutex_lock(&cache->mutex);
filed_log_msg_debug("Completed locking mutex for idx: %lu", (unsigned long) cache_idx);
if (strcmp(path, cache->path) != 0) {
filed_log_msg_debug("Cache miss for idx: %lu: OLD \"%s\", NEW \"%s\"", (unsigned long) cache_idx, cache->path, path);
/* For requests for the root directory, serve out index.html */
if (path[0] == '\0' || (path[0] == '/' && path[1] == '\0')) {
open_path = "/index.html";
} else {
open_path = path;
}
fd = open(open_path, O_RDONLY | O_LARGEFILE);
if (fd < 0) {
pthread_mutex_unlock(&cache->mutex);
return(NULL);
}
if (cache->fd >= 0) {
close(cache->fd);
}
len = lseek(fd, 0, SEEK_END);
lseek(fd, 0, SEEK_SET);
cache->fd = fd;
cache->len = len;
strcpy(cache->path, path);
cache->type = filed_determine_mimetype(open_path);
filed_generate_etag(cache->etag, sizeof(cache->etag));
/* XXX:TODO: Determine */
cache->lastmod = filed_format_time(cache->lastmod_b, sizeof(cache->lastmod_b), time(NULL) - 30);
} else {
filed_log_msg_debug("Cache hit for idx: %lu: PATH \"%s\"", (unsigned long) cache_idx, path);
}
/*
* We have to make a duplicate FD, because once we release the cache
* mutex, the file descriptor may be closed
*/
fd = dup(cache->fd);
if (fd < 0) {
pthread_mutex_unlock(&cache->mutex);
return(NULL);
}
buffer->fd = fd;
buffer->len = cache->len;
buffer->type = cache->type;
memcpy(buffer->lastmod_b, cache->lastmod_b, sizeof(buffer->lastmod_b));
memcpy(buffer->etag, cache->etag, sizeof(buffer->etag));
buffer->lastmod = buffer->lastmod_b + (cache->lastmod - cache->lastmod_b);
pthread_mutex_unlock(&cache->mutex);
return(buffer);
}
/* Process an HTTP request and return the path requested */
static struct filed_http_request *filed_get_http_request(FILE *fp, struct filed_http_request *buffer_st) {
char *method, *path;
char *buffer, *workbuffer, *workbuffer_next;
char *fgets_ret;
size_t buffer_len;
off_t range_start, range_end, range_length;
int range_request;
int i;
range_start = 0;
range_end = 0;
range_request = 0;
range_length = -1;
buffer = buffer_st->tmpbuf;
buffer_len = sizeof(buffer_st->tmpbuf);
fgets_ret = fgets(buffer, buffer_len, fp);
if (fgets_ret == NULL) {
return(NULL);
}
method = buffer;
buffer = strchr(buffer, ' ');
if (buffer == NULL) {
return(NULL);
}
*buffer = '\0';
buffer++;
path = buffer;
buffer = strchr(buffer, ' ');
if (buffer != NULL) {
*buffer = '\0';
buffer++;
}
/* We only handle the "GET" and "HEAD' methods */
if (strcasecmp(method, "head") != 0) {
if (strcasecmp(method, "get") != 0) {
return(NULL);
}
/* GET request */
buffer_st->method = FILED_REQUEST_METHOD_GET;
} else {
/* HEAD request */
buffer_st->method = FILED_REQUEST_METHOD_HEAD;
}
/* Note path */
strcpy(buffer_st->path, path);
/* Reset buffer for later use */
buffer = buffer_st->tmpbuf;
for (i = 0; i < 100; i++) {
fgets_ret = fgets(buffer, buffer_len, fp);
if (fgets_ret == NULL) {
break;
}
if (strncasecmp(buffer, "Range: ", 7) == 0) {
workbuffer = buffer + 7;
if (strncasecmp(workbuffer, "bytes=", 6) == 0) {
workbuffer += 6;
range_request = 1;
range_start = strtoull(workbuffer, &workbuffer_next, 10);
workbuffer = workbuffer_next;
if (*workbuffer == '-') {
workbuffer++;
if (*workbuffer != '\r' && *workbuffer != '\n') {
range_end = strtoull(workbuffer, &workbuffer_next, 10);
}
}
}
}
if (memcmp(buffer, "\r\n", 2) == 0) {
break;
}
}
/* Determine range */
if (range_end != 0) {
if (range_end <= range_start) {
return(NULL);
}
range_length = range_end - range_start;
filed_log_msg_debug("Computing length parameter: %llu = %llu - %llu",
(unsigned long long) range_length,
(unsigned long long) range_end,
(unsigned long long) range_start
);
}
/* Fill up structure to return */
buffer_st->headers.range.present = range_request;
buffer_st->headers.range.offset = range_start;
buffer_st->headers.range.length = range_length;
return(buffer_st);
}
/* Return an error page */
static void filed_error_page(FILE *fp, const char *date_current, int error_number, int method) {
char *error_string = "<html><head><title>ERROR</title></head><body>Unable to process request</body></html>";
fprintf(fp, "HTTP/1.1 %i Not 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",
error_number,
date_current,
date_current,
(unsigned long long) strlen(error_string),
"text/html"
);
/* silence error string for HEAD requests */
if (method != FILED_REQUEST_METHOD_HEAD) {
fprintf(fp, "%s", error_string);
}
return;
}
/* Handle a single request from a client */
static void filed_handle_client(int fd, struct filed_http_request *request, struct filed_log_entry *log) {
struct filed_fileinfo *fileinfo;
ssize_t sendfile_ret;
size_t sendfile_size;
off_t sendfile_offset, sendfile_sent, sendfile_len;
char *path;
char *date_current, date_current_b[64];
int http_code;
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;
}
request = filed_get_http_request(fp, request);
if (request == NULL) {
filed_error_page(fp, date_current, 500, FILED_REQUEST_METHOD_GET);
log->buffer[0] = '\0';
log->http_code = 500;
log->reason = "format";
filed_log_entry(log);
fclose(fp);
return;
}
path = request->path;
strcpy(log->buffer, path);
log->method = request->method;
http_code = -1;
fileinfo = filed_open_file(path, &request->fileinfo);
if (fileinfo == NULL) {
filed_error_page(fp, date_current, 404, request->method);
log->http_code = 404;
log->reason = "open_failed";
filed_log_entry(log);
} else {
if (request->headers.range.offset != 0 || request->headers.range.length >= 0) {
if (request->headers.range.offset >= fileinfo->len) {
filed_error_page(fp, date_current, 416, request->method);
log->http_code = 416;
log->reason = "range_invalid";
filed_log_entry(log);
} else {
if (request->headers.range.length == ((off_t) -1)) {
filed_log_msg_debug("Computing length to fit in bounds: fileinfo->len = %llu, request->headers.range.offset = %llu",
(unsigned long long) fileinfo->len,
(unsigned long long) request->headers.range.offset
);
request->headers.range.length = fileinfo->len - request->headers.range.offset;
}
filed_log_msg_debug("Partial request, starting at: %llu and running for %lli bytes",
(unsigned long long) request->headers.range.offset,
(long long) request->headers.range.length
);
http_code = 206;
}
} else {
if (request->headers.range.present) {
http_code = 206;
} else {
http_code = 200;
}
request->headers.range.offset = 0;
request->headers.range.length = fileinfo->len;
}
if (http_code > 0) {
fprintf(fp, "HTTP/1.1 %i OK\r\nDate: %s\r\nServer: filed\r\nLast-Modified: %s\r\nContent-Length: %llu\r\nAccept-Ranges: bytes\r\nContent-Type: %s\r\nConnection: close\r\nETag: \"%s\"\r\n",
http_code,
date_current,
fileinfo->lastmod,
(unsigned long long) request->headers.range.length,
fileinfo->type,
fileinfo->etag
);
if (http_code == 206) {
fprintf(fp, "Content-Range: bytes %llu-%llu/%llu\r\n",
(unsigned long long) request->headers.range.offset,
(unsigned long long) (request->headers.range.offset + request->headers.range.length - 1),
(unsigned long long) fileinfo->len
);
}
fprintf(fp, "\r\n");
fflush(fp);
log->http_code = http_code;
log->reason = "OK";
log->starttime = time(NULL);
log->req_offset = request->headers.range.offset;
log->req_length = request->headers.range.length;
log->file_length = fileinfo->len;
#ifdef FILED_NONBLOCK_HTTP
int socket_flags;
fd_set rfd, wfd;
char sinkbuf[8192];
ssize_t read_ret;
FD_ZERO(&rfd);
FD_ZERO(&wfd);
FD_SET(fd, &rfd);
FD_SET(fd, &wfd);
socket_flags = fcntl(fd, F_GETFL);
fcntl(fd, F_SETFL, socket_flags | O_NONBLOCK);
#endif
sendfile_offset = request->headers.range.offset;
sendfile_len = request->headers.range.length;
sendfile_sent = 0;
while (request->method == FILED_REQUEST_METHOD_GET) {
if (sendfile_len > FILED_SENDFILE_MAX) {
sendfile_size = FILED_SENDFILE_MAX;
} else {
sendfile_size = sendfile_len;
}
sendfile_ret = sendfile(fd, fileinfo->fd, &sendfile_offset, sendfile_size);
if (sendfile_ret <= 0) {
#ifdef FILED_NONBLOCK_HTTP
if (errno == EAGAIN) {
sendfile_ret = 0;
while (1) {
select(fd + 1, &rfd, &wfd, NULL, NULL);
if (FD_ISSET(fd, &rfd)) {
read_ret = read(fd, sinkbuf, sizeof(sinkbuf));
if (read_ret <= 0) {
break;
}
}
if (FD_ISSET(fd, &wfd)) {
read_ret = 1;
break;
}
}
if (read_ret <= 0) {
break;
}
} else {
break;
}
#else
break;
#endif
}
sendfile_len -= sendfile_ret;
sendfile_sent += sendfile_ret;
if (sendfile_len == 0) {
break;
}
}
log->endtime = (time_t) -1;
log->sent_length = sendfile_sent;
filed_log_entry(log);
}
close(fileinfo->fd);
}
fclose(fp);
return;
}
/* Handle incoming connections */
static void *filed_worker_thread(void *arg_v) {
struct filed_worker_thread_args *arg;
struct filed_http_request request;
struct filed_log_entry *log, local_dummy_log;
struct sockaddr_in6 addr;
socklen_t addrlen;
int failure_count = 0, max_failure_count = FILED_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 */
log = filed_log_new(1);
if (log == NULL) {
close(fd);
continue;
}
log->type = FILED_LOG_TYPE_TRANSFER;
if (filed_log_ip((struct sockaddr *) &addr, log->ip, sizeof(log->ip)) == NULL) {
log->ip[0] = '\0';
}
log->port = addr.sin6_port;
/* Reset failure count*/
failure_count = 0;
/* Handle socket */
filed_handle_client(fd, &request, log);
}
/* Report error */
filed_log_msg("THREAD_DIED ABNORMAL");
return(NULL);
/* local_dummy_log is only used if FILED_DONT_LOG is enabled, otherwise it's not used, but the compiler hates that idea. */
local_dummy_log.type = 0;
local_dummy_log.type = local_dummy_log.type;
}
/* 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);
}
/* Display help */
static void filed_print_help(FILE *output, int long_help, const char *extra) {
if (extra) {
fprintf(output, "%s\n", extra);
}
fprintf(output, "Usage: filed [<options>]\n");
fprintf(output, " Options:\n");
fprintf(output, " -h, --help\n");
fprintf(output, " -d, --daemon\n");
fprintf(output, " -v, --version\n");
fprintf(output, " -b <address>, --bind <address>\n");
fprintf(output, " -p <port>, --port <port>\n");
fprintf(output, " -t <count>, --threads <count>\n");
fprintf(output, " -c <entries>, --cache <entries>\n");
fprintf(output, " -l <file>, --log <file>\n");
fprintf(output, " -u <user>, --user <user>\n");
fprintf(output, " -r <directory>, --root <directory>\n");
if (long_help) {
fprintf(output, "\n");
fprintf(output, " Usage:\n");
fprintf(output, " -h (or --help) prints this usage information.\n");
fprintf(output, "\n");
fprintf(output, " -d (or --daemon) instructs filed to become a daemon after initializing\n");
fprintf(output, " the listening TCP socket and log files.\n");
fprintf(output, "\n");
fprintf(output, " -v (or --version) instructs filed print out the version number and exit.\n");
fprintf(output, "\n");
fprintf(output, " -b (or --bind) specifies the address to listen for incoming HTTP\n");
fprintf(output, " requests on. The default value is \"%s\".\n", BIND_ADDR);
fprintf(output, "\n");
fprintf(output, " -p (or --port) specifies the TCP port number to listen for incoming HTTP\n");
fprintf(output, " requests on. The default is %u.\n", (unsigned int) PORT);
fprintf(output, "\n");
fprintf(output, " -t (or --threads) specifies the number of worker threads to create. Each\n");
fprintf(output, " worker thread can service one concurrent HTTP session.\n");
fprintf(output, " Thus the number of threads created will determine how\n");
fprintf(output, " many simultaneous transfers will be possible. The\n");
fprintf(output, " default is %lu.\n", (unsigned long) THREAD_COUNT);
fprintf(output, "\n");
fprintf(output, " -c (or --cache) specifies the number of file information cache entries\n");
fprintf(output, " to allocate. Each cache entry holds file information as\n");
fprintf(output, " well as an open file descriptor to the file, so resource\n");
fprintf(output, " limits (i.e., ulimit) should be considered. This should\n");
fprintf(output, " be a prime number for ideal use with the lookup method.\n");
fprintf(output, " The default is %lu.\n", (unsigned long) CACHE_SIZE);
fprintf(output, "\n");
fprintf(output, " -l (or --log) specifies a filename to open for writing log entries. Log\n");
fprintf(output, " entries are made for various stages in transfering files.\n");
fprintf(output, " The log file is opened before switching users (see \"-u\")\n");
fprintf(output, " and root directories (see \"-r\"). The log file is never\n");
fprintf(output, " closed so log rotation without stopping the daemon is will\n");
fprintf(output, " not work. The value of \"-\" indicates that standard output\n");
fprintf(output, " should be used for logging. If the filename begins with a\n");
fprintf(output, " pipe (\"|\") then a process is started and used for logging\n");
fprintf(output, " instead of a file. The default is \"%s\".\n", LOG_FILE);
#ifdef FILED_DONT_LOG
fprintf(output, " Note that logging is completely disabled so this option does\n");
fprintf(output, " nothing in this build.\n");
#endif
fprintf(output, "\n");
fprintf(output, " -u (or --user) specifies the user to switch user IDs to before servicing\n");
fprintf(output, " requests. The default is not change user IDs.\n");
fprintf(output, "\n");
fprintf(output, " -r (or --root) specifies the directory to act as the root directory for\n");
fprintf(output, " the file server. If this option is specified, chroot(2)\n");
fprintf(output, " is called. The default is not change root directories,\n");
fprintf(output, " that is, the \"/\" directory is shared out. This will\n");
fprintf(output, " likely be a security issue, so this option should always\n");
fprintf(output, " be used.\n");
}
return;
}
/* Add a getopt option */
static void filed_getopt_long_setopt(struct option *opt, const char *name, int has_arg, int val) {
opt->name = name;
opt->has_arg = has_arg;
opt->flag = NULL;
opt->val = val;
return;
}
/* Resolve a username to a UID */
static int filed_user_lookup(const char *user, uid_t *user_id) {
char *next;
uid_t user_id_check;
#ifndef FILED_NO_GETPWNAM
struct passwd *ent;
ent = getpwnam(user);
if (ent != NULL) {
*user_id = ent->pw_uid;
return(0);
}
#endif
user_id_check = strtoull(user, &next, 10);
if (next == NULL) {
return(1);
}
if (next[0] != '\0') {
return(1);
}
*user_id = user_id_check;
return(0);
}
/* Daemonize */
static int filed_daemonize(void) {
pid_t setsid_ret, fork_ret;
int chdir_ret, dup2_ret;
int fd_in, fd_out;
chdir_ret = chdir("/");
if (chdir_ret != 0) {
return(1);
}
fork_ret = fork();
if (fork_ret < 0) {
return(1);
}
if (fork_ret > 0) {
/* Parent */
waitpid(fork_ret, NULL, 0);
exit(EXIT_SUCCESS);
}
/* Child */
if (fork() != 0) {
/* Child */
exit(EXIT_SUCCESS);
}
/* Grand child */
setsid_ret = setsid();
if (setsid_ret == ((pid_t) -1)) {
return(1);
}
fd_in = open("/dev/null", O_RDONLY);
fd_out = open("/dev/null", O_WRONLY);
if (fd_in < 0 || fd_out < 0) {
return(1);
}
dup2_ret = dup2(fd_in, STDIN_FILENO);
if (dup2_ret != STDIN_FILENO) {
return(1);
}
dup2_ret = dup2(fd_out, STDOUT_FILENO);
if (dup2_ret != STDOUT_FILENO) {
return(1);
}
dup2_ret = dup2(fd_out, STDERR_FILENO);
if (dup2_ret != STDERR_FILENO) {
return(1);
}
close(fd_in);
close(fd_out);
return(0);
}
/* Run process */
int main(int argc, char **argv) {
struct option options[11];
const char *bind_addr = BIND_ADDR, *newroot = NULL, *log_file = LOG_FILE;
FILE *log_fp;
uid_t user = 0;
int port = PORT, thread_count = THREAD_COUNT;
int cache_size = CACHE_SIZE;
int init_ret, chroot_ret, setuid_ret, lookup_ret, chdir_ret;
int setuid_enabled = 0, daemon_enabled = 0;
int ch;
int fd;
/* Process arguments */
filed_getopt_long_setopt(&options[0], "port", required_argument, 'p');
filed_getopt_long_setopt(&options[1], "threads", required_argument, 't');
filed_getopt_long_setopt(&options[2], "cache", required_argument, 'c');
filed_getopt_long_setopt(&options[3], "bind", required_argument, 'b');
filed_getopt_long_setopt(&options[4], "user", required_argument, 'u');
filed_getopt_long_setopt(&options[5], "root", required_argument, 'r');
filed_getopt_long_setopt(&options[6], "help", no_argument, 'h');
filed_getopt_long_setopt(&options[7], "daemon", no_argument, 'd');
filed_getopt_long_setopt(&options[8], "log", required_argument, 'l');
filed_getopt_long_setopt(&options[9], "version", no_argument, 'v');
filed_getopt_long_setopt(&options[10], NULL, 0, 0);
while ((ch = getopt_long(argc, argv, "p:t:c:b:u:r:l:hdv", options, NULL)) != -1) {
switch(ch) {
case 'p':
port = atoi(optarg);
break;
case 't':
thread_count = atoi(optarg);
break;
case 'c':
cache_size = atoi(optarg);
break;
case 'b':
bind_addr = strdup(optarg);
break;
case 'u':
setuid_enabled = 1;
lookup_ret = filed_user_lookup(optarg, &user);
if (lookup_ret != 0) {
filed_print_help(stderr, 0, "Invalid username specified");
return(1);
}
break;
case 'r':
newroot = strdup(optarg);
break;
case 'l':
log_file = strdup(optarg);
break;
case 'd':
daemon_enabled = 1;
break;
case 'v':
printf("filed version %s\n", FILED_VERSION);
return(0);
case '?':
case ':':
filed_print_help(stderr, 0, NULL);
return(1);
case 'h':
filed_print_help(stdout, 1, NULL);
return(0);
}
}
/* Open log file */
log_fp = filed_log_open(log_file);
if (log_fp == NULL) {
perror("filed_log_open");
return(4);
}
/* Create listening socket */
fd = filed_listen(bind_addr, port);
if (fd < 0) {
perror("filed_listen");
return(1);
}
/* Become a daemon */
if (daemon_enabled) {
init_ret = filed_daemonize();
if (init_ret != 0) {
perror("filed_daemonize");
return(6);
}
}
/* Chroot, if appropriate */
if (newroot) {
chdir_ret = chdir(newroot);
if (chdir_ret != 0) {
perror("chdir");
return(1);
}
chroot_ret = chroot(".");
if (chroot_ret != 0) {
perror("chroot");
return(1);
}
}
/* Drop privileges, if appropriate */
if (setuid_enabled) {
setuid_ret = setuid(user);
if (setuid_ret != 0) {
perror("setuid");
return(1);
}
}
/* Initialize */
init_ret = filed_init(cache_size);
if (init_ret != 0) {
perror("filed_init");
return(3);
}
/* Create logging thread */
init_ret = filed_logging_thread_init(log_fp);
if (init_ret != 0) {
perror("filed_logging_thread_init");
return(4);
}
/* Create worker threads */
init_ret = filed_worker_threads_init(fd, thread_count);
if (init_ret != 0) {
perror("filed_worker_threads_init");
return(5);
}
/* Wait for threads to exit */
/* XXX:TODO: Monitor thread usage */
while (1) {
sleep(60);
}
/* Return in failure */
return(2);
}