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/* B01902062 藍挺瑋 */
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "common.h"
#include "proc.h"
#include <arpa/inet.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
bool procconn(server* svr, request* req, int maxfd,
struct timeval timeout, svr_msg message_cb) {
fd_set rset = svr->readfds;
fd_set wset = svr->writefds;
fd_set eset = svr->exceptfds;
struct timeval select_timeout = timeout;
int rval;
rval = select (maxfd, &rset, &wset, &eset, &select_timeout);
if (proc_message_request)
(*message_cb)(svr, req, maxfd);
if (proc_quit_request)
return false;
if (rval < 0) {
if (errno != EINTR)
perror ("select");
return true;
}
for (int i = 0; i < maxfd; i++) {
if (!FD_ISSET (i, &rset))
continue;
if (i == svr->listen_fd) {
struct sockaddr_in client_addr;
int client_len = sizeof (client_addr);
int conn_fd = accept (i,
(struct sockaddr*)&client_addr, (socklen_t*)&client_len);
if (conn_fd < 0) {
switch (errno) {
case EINTR:
case EAGAIN:
continue;
case EMFILE:
case ENFILE:
fprintf (stderr, "Too many open file ... "
"(maxfd %d)\n", maxfd);
continue;
default:
perror ("accept");
continue;
}
} else {
req[conn_fd].conn_fd = conn_fd;
req[conn_fd].active = true;
strcpy(req[conn_fd].host, inet_ntoa(client_addr.sin_addr));
request_msg (&req[conn_fd], "accepted, waiting for filename");
FD_SET (conn_fd, &(svr->readfds));
}
} else {
rval = request_read(&req[i]);
if (rval <= 0) {
request_msg (&req[i], "socket read: %s",
rval ? strerror (errno) : "connection closed");
request_free (&req[i], svr);
} else {
if (req[i].header_done) {
// ignore remaining chars in the buffer
req[i].buf_len = 0;
FD_CLR (req[i].conn_fd, &(svr->readfds));
FD_SET (req[i].conn_fd, &(svr->writefds));
}
}
}
}
for (int i = 0; i < maxfd; i++) {
if (!FD_ISSET (i, &wset))
continue;
if (i == svr->listen_fd)
continue;
if (req[i].header_done) {
if (!req[i].header_accept) {
req[i].file_fd = open (req[i].filename, O_RDONLY);
request_err (&req[i], "open", req[i].file_fd);
if (req[i].file_fd < 0) {
write (req[i].conn_fd, svr->reject_hdr, SVR_REJECT_HDR_LEN);
request_msg (&req[i], "REJECT sent");
request_free (&req[i], svr);
continue;
}
struct stat file_stat;
rval = fstat (req[i].file_fd, &file_stat);
request_msg (&req[i], "fstat", rval);
if (req[i].file_fd < 0) {
write (req[i].conn_fd, svr->reject_hdr, SVR_REJECT_HDR_LEN);
request_msg (&req[i], "REJECT sent");
request_free (&req[i], svr);
continue;
}
req[i].file_info = ftab_insert (
svr->file_table,
file_stat.st_dev,
file_stat.st_ino,
req[i].file_fd);
struct flock lock_info = {
.l_type = F_RDLCK,
.l_whence = SEEK_SET,
.l_start = 0,
.l_len = 0
};
rval = fcntl (req[i].file_fd, F_SETLK, &lock_info);
request_msg (&req[i], "lock", rval);
if (rval < 0) {
write (req[i].conn_fd, svr->reject_hdr, SVR_REJECT_HDR_LEN);
request_msg (&req[i], "REJECT sent");
request_free (&req[i], svr);
continue;
}
request_msg (&req[i], "ACCEPT sent");
write (req[i].conn_fd, svr->accept_hdr, SVR_ACCEPT_HDR_LEN);
req[i].header_accept = true;
} else {
if (!req[i].buf_len) {
rval = read (req[i].file_fd, req[i].buf, SVR_BUFFER_SIZE);
if (rval < 0) {
if (errno != EINTR &&
errno != EAGAIN)
{
// fatal error, close the connection
request_msg (&req[i], "read: %s", strerror (errno));
request_free (&req[i], svr);
}
continue;
} else if (rval == 0) {
request_msg (&req[i], "transfer done, closing connection");
request_free (&req[i], svr);
continue;
}
req[i].buf_set = 0;
req[i].buf_len = rval;
}
rval = write (req[i].conn_fd, req[i].buf + req[i].buf_set,
req[i].buf_len);
if (rval < 0) {
request_msg (&req[i], "socket write: %s", strerror (errno));
request_free (&req[i], svr);
continue;
}
req[i].buf_set += rval;
req[i].buf_len -= rval;
}
}
}
return true;
}
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