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rt-thread-official/net/apps/ftpd.c

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#include <string.h>
#include <stdlib.h>
#include <rtthread.h>
#include <dfs_posix.h>
#include <lwip/sockets.h>
#define FTP_PORT 21
#define FTP_SRV_ROOT "/"
#define FTP_MAX_CONNECTION 2
#define FTP_USER "rtt"
#define FTP_PASSWORD "demo"
#define FTP_WELCOME_MSG "220-= welcome on RT-Thread FTP server =-\r\n220 \r\n"
#define FTP_BUFFER_SIZE 1024
struct ftp_session
{
rt_bool_t is_anonymous;
int sockfd;
struct sockaddr_in remote;
/* pasv data */
char pasv_active;
int pasv_sockfd;
unsigned short pasv_port;
size_t offset;
/* current directory */
char currentdir[256];
struct ftp_session* next;
};
static struct ftp_session* session_list = NULL;
int ftp_process_request(struct ftp_session* session, char * buf);
int ftp_get_filesize(char *filename);
struct ftp_session* ftp_new_session()
{
struct ftp_session* session;
session = (struct ftp_session*)rt_malloc(sizeof(struct ftp_session));
session->next = session_list;
session_list = session;
return session;
}
void ftp_close_session(struct ftp_session* session)
{
struct ftp_session* list;
if (session_list == session)
{
session_list = session_list->next;
session->next = NULL;
}
else
{
list = session_list;
while (list->next != session) list = list->next;
list->next = session->next;
session->next = NULL;
}
rt_free(session);
}
int ftp_get_filesize(char * filename)
{
int pos;
int end;
int fd;
fd = open(filename, O_RDONLY, 0);
if (fd < 0) return -1;
pos = lseek(fd, 0, SEEK_CUR);
end = lseek(fd, 0, SEEK_END);
lseek (fd, pos, SEEK_SET);
close(fd);
return end;
}
rt_bool_t is_absolute_path(char* path)
{
#ifdef _WIN32
if (path[0] == '\\' ||
(path[1] == ':' && path[2] == '\\'))
return RT_TRUE;
#else
if (path[0] == '/') return RT_TRUE;
#endif
return RT_FALSE;
}
int build_full_path(struct ftp_session* session, char* path, char* new_path, size_t size)
{
if (is_absolute_path(path) == RT_TRUE)
strcpy(new_path, path);
else
{
rt_sprintf(new_path, "%s/%s", session->currentdir, path);
}
return 0;
}
void ftpd_thread_entry(void* parameter)
{
int numbytes;
int sockfd, maxfdp1;
struct sockaddr_in local;
fd_set readfds, tmpfds;
struct ftp_session* session;
rt_uint32_t addr_len = sizeof(struct sockaddr);
char * buffer = (char *) rt_malloc(FTP_BUFFER_SIZE);
local.sin_port=htons(FTP_PORT);
local.sin_family=PF_INET;
local.sin_addr.s_addr=INADDR_ANY;
FD_ZERO(&readfds);
FD_ZERO(&tmpfds);
sockfd=socket(AF_INET, SOCK_STREAM, 0);
if(sockfd < 0)
{
rt_kprintf("create socket failed\n");
return ;
}
bind(sockfd, (struct sockaddr *)&local, addr_len);
listen(sockfd, FTP_MAX_CONNECTION);
FD_SET(sockfd, &readfds);
for(;;)
{
/* get maximum fd */
maxfdp1 = sockfd + 1;
session = session_list;
while (session != RT_NULL)
{
if (maxfdp1 < session->sockfd + 1)
maxfdp1 = session->sockfd + 1;
FD_SET(session->sockfd, &readfds);
session = session->next;
}
tmpfds=readfds;
if (select(maxfdp1, &tmpfds, 0, 0, 0) == 0) continue;
if(FD_ISSET(sockfd, &tmpfds))
{
int com_socket;
struct sockaddr_in remote;
com_socket = accept(sockfd, (struct sockaddr*)&remote, &addr_len);
if(com_socket == -1)
{
rt_kprintf("Error on accept()\nContinuing...\n");
continue;
}
else
{
rt_kprintf("Got connection from %s\n", inet_ntoa(remote.sin_addr));
send(com_socket, FTP_WELCOME_MSG, strlen(FTP_WELCOME_MSG), 0);
FD_SET(com_socket, &readfds);
/* new session */
session = ftp_new_session();
if (session != NULL)
{
strcpy(session->currentdir, FTP_SRV_ROOT);
session->sockfd = com_socket;
session->remote = remote;
}
}
}
{
struct ftp_session* next;
session = session_list;
while (session != NULL)
{
next = session->next;
if (FD_ISSET(session->sockfd, &tmpfds))
{
numbytes=recv(session->sockfd, buffer, FTP_BUFFER_SIZE, 0);
if(numbytes==0 || numbytes==-1)
{
rt_kprintf("Client %s disconnected\n", inet_ntoa(session->remote.sin_addr));
FD_CLR(session->sockfd, &readfds);
closesocket(session->sockfd);
ftp_close_session(session);
}
else
{
buffer[numbytes]=0;
if(ftp_process_request(session, buffer)==-1)
{
rt_kprintf("Client %s disconnected\r\n", inet_ntoa(session->remote.sin_addr));
closesocket(session->sockfd);
ftp_close_session(session);
}
}
}
session = next;
}
}
}
// rt_free(buffer);
}
int do_list(char* directory, int sockfd)
{
DIR* dirp;
struct dirent* entry;
char line_buffer[256], line_length;
#ifdef _WIN32
struct _stat s;
#else
struct stat s;
#endif
dirp = opendir(directory);
if (dirp == NULL)
{
line_length = rt_sprintf(line_buffer, "500 Internal Error\r\n");
send(sockfd, line_buffer, line_length, 0);
return -1;
}
while (1)
{
entry = readdir(dirp);
if (entry == NULL) break;
rt_sprintf(line_buffer, "%s/%s", directory, entry->d_name);
#ifdef _WIN32
if (_stat(line_buffer, &s) ==0)
#else
if (stat(line_buffer, &s) == 0)
#endif
{
if (s.st_mode & S_IFDIR)
line_length = rt_sprintf(line_buffer, "drw-r--r-- 1 admin admin %d Jan 1 2000 %s\r\n", 0, entry->d_name);
else
line_length = rt_sprintf(line_buffer, "-rw-r--r-- 1 admin admin %d Jan 1 2000 %s\r\n", s.st_size, entry->d_name);
send(sockfd, line_buffer, line_length, 0);
}
}
closedir(dirp);
return 0;
}
int do_simple_list(char* directory, int sockfd)
{
DIR* dirp;
struct dirent* entry;
char line_buffer[256], line_length;
dirp = opendir(directory);
if (dirp == NULL)
{
line_length = rt_sprintf(line_buffer, "500 Internal Error\r\n");
send(sockfd, line_buffer, line_length, 0);
return -1;
}
while (1)
{
entry = readdir(dirp);
if (entry == NULL) break;
line_length = rt_sprintf(line_buffer, "%s\r\n", entry->d_name);
send(sockfd, line_buffer, line_length, 0);
}
closedir(dirp);
return 0;
}
int str_begin_with(char* src, char* match)
{
while (*match)
{
/* check source */
if (*src == 0) return -1;
if (*match != *src) return -1;
match ++; src ++;
}
return 0;
}
int ftp_process_request(struct ftp_session* session, char *buf)
{
int fd;
struct timeval tv;
fd_set readfds;
char filename[256];
int numbytes;
char *sbuf;
char *parameter_ptr, *ptr;
rt_uint32_t addr_len = sizeof(struct sockaddr_in);
struct sockaddr_in local, pasvremote;
sbuf =(char *)rt_malloc(FTP_BUFFER_SIZE);
tv.tv_sec=3, tv.tv_usec=0;
local.sin_family=PF_INET;
local.sin_addr.s_addr=INADDR_ANY;
/* remove \r\n */
ptr = buf;
while (*ptr)
{
if (*ptr == '\r' || *ptr == '\n') *ptr = 0;
ptr ++;
}
/* get request parameter */
parameter_ptr = strchr(buf, ' '); if (parameter_ptr != NULL) parameter_ptr ++;
// debug:
rt_kprintf("%s requested: \"%s\"\n", inet_ntoa(session->remote.sin_addr), buf);
//
//-----------------------
if(str_begin_with(buf, "USER")==0)
{
rt_kprintf("%s sent login \"%s\"\n", inet_ntoa(session->remote.sin_addr), parameter_ptr);
// login correct
if(strcmp(parameter_ptr, "anonymous") == 0)
{
session->is_anonymous = RT_TRUE;
rt_sprintf(sbuf, "331 Anonymous login OK send e-mail address for password.\r\n", parameter_ptr);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if (strcmp(parameter_ptr, FTP_USER) == 0)
{
session->is_anonymous = RT_FALSE;
rt_sprintf(sbuf, "331 Password required for %s\r\n", parameter_ptr);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else
{
// incorrect login
rt_sprintf(sbuf, "530 Login incorrect. Bye.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return -1;
}
return 0;
}
else if(str_begin_with(buf, "PASS")==0)
{
rt_kprintf("%s sent password \"%s\"\n", inet_ntoa(session->remote.sin_addr), parameter_ptr);
if (strcmp(parameter_ptr, FTP_PASSWORD)==0 ||
session->is_anonymous == RT_TRUE)
{
// password correct
rt_sprintf(sbuf, "230 User logged in\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return 0;
}
// incorrect password
rt_sprintf(sbuf, "530 Login or Password incorrect. Bye!\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return -1;
}
else if(str_begin_with(buf, "LIST")==0 )
{
memset(sbuf,0,FTP_BUFFER_SIZE);
rt_sprintf(sbuf, "150 Opening Binary mode connection for file list.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
do_list(session->currentdir, session->pasv_sockfd);
closesocket(session->pasv_sockfd);
session->pasv_active = 0;
rt_sprintf(sbuf, "226 Transfert Complete.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "NLST")==0 )
{
memset(sbuf, 0, FTP_BUFFER_SIZE);
rt_sprintf(sbuf, "150 Opening Binary mode connection for file list.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
do_simple_list(session->currentdir, session->pasv_sockfd);
closesocket(session->pasv_sockfd);
session->pasv_active = 0;
rt_sprintf(sbuf, "226 Transfert Complete.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "PWD")==0 || str_begin_with(buf, "XPWD")==0)
{
rt_sprintf(sbuf, "257 \"%s\" is current directory.\r\n", session->currentdir);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "TYPE")==0)
{
// Ignore it
if(strcmp(parameter_ptr, "I")==0)
{
rt_sprintf(sbuf, "200 Type set to binary.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else
{
rt_sprintf(sbuf, "200 Type set to ascii.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
}
else if(str_begin_with(buf, "PASV")==0)
{
int dig1, dig2;
int sockfd;
char optval='1';
session->pasv_port = 10000;
session->pasv_active = 1;
local.sin_port=htons(session->pasv_port);
local.sin_addr.s_addr=INADDR_ANY;
dig1 = (int)(session->pasv_port/256);
dig2 = session->pasv_port % 256;
FD_ZERO(&readfds);
if((sockfd=socket(PF_INET, SOCK_STREAM, 0))==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
goto err1;
}
if(setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof(optval))==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
goto err1;
}
if(bind(sockfd, (struct sockaddr *)&local, addr_len)==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
goto err1;
}
if(listen(sockfd, 1)==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
goto err1;
}
rt_kprintf("Listening %d seconds @ port %d\n", tv.tv_sec, session->pasv_port);
rt_sprintf(sbuf, "227 Entering passive mode (%d,%d,%d,%d,%d,%d)\r\n", 127, 0, 0, 1, dig1, dig2);
send(session->sockfd, sbuf, strlen(sbuf), 0);
FD_SET(sockfd, &readfds);
select(0, &readfds, 0, 0, &tv);
if(FD_ISSET(sockfd, &readfds))
{
if((session->pasv_sockfd = accept(sockfd, (struct sockaddr*)&pasvremote, &addr_len))==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
goto err1;
}
else
{
rt_kprintf("Got Data(PASV) connection from %s\n", inet_ntoa(pasvremote.sin_addr));
session->pasv_active = 1;
closesocket(sockfd);
}
}
else
{
err1:
closesocket(session->pasv_sockfd);
session->pasv_active = 0;
rt_free(sbuf);
return 0;
}
}
else if (str_begin_with(buf, "RETR")==0)
{
int file_size;
strcpy(filename, buf + 5);
build_full_path(session, parameter_ptr, filename, 256);
file_size = ftp_get_filesize(filename);
if (file_size == -1)
{
rt_sprintf(sbuf, "550 \"%s\" : not a regular file\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
session->offset=0;
rt_free(sbuf);
return 0;
}
fd = open(filename, O_RDONLY, 0);
if (fd < 0)
{
rt_free(sbuf);
return 0;
}
if(session->offset>0 && session->offset < file_size)
{
lseek(fd, session->offset, SEEK_SET);
rt_sprintf(sbuf, "150 Opening binary mode data connection for partial \"%s\" (%d/%d bytes).\r\n",
filename, file_size - session->offset, file_size);
}
else
{
rt_sprintf(sbuf, "150 Opening binary mode data connection for \"%s\" (%d bytes).\r\n", filename, file_size);
}
send(session->sockfd, sbuf, strlen(sbuf), 0);
while((numbytes = read(fd, sbuf, FTP_BUFFER_SIZE))>0)
{
send(session->pasv_sockfd, sbuf, numbytes, 0);
}
rt_sprintf(sbuf, "226 Finished.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
closesocket(session->pasv_sockfd);
}
else if (str_begin_with(buf, "STOR")==0)
{
if(session->is_anonymous == RT_TRUE)
{
rt_sprintf(sbuf, "550 Permission denied.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return 0;
}
build_full_path(session, parameter_ptr, filename, 256);
fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0);
if(fd < 0)
{
rt_sprintf(sbuf, "550 Cannot open \"%s\" for writing.\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return 0;
}
rt_sprintf(sbuf, "150 Opening binary mode data connection for \"%s\".\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
FD_ZERO(&readfds);
FD_SET(session->pasv_sockfd, &readfds);
rt_kprintf("Waiting %d seconds for data...\n", tv.tv_sec);
while(select(session->pasv_sockfd+1, &readfds, 0, 0, &tv)>0 )
{
if((numbytes=recv(session->pasv_sockfd, sbuf, FTP_BUFFER_SIZE, 0))>0)
{
write(fd, sbuf, numbytes);
}
else if(numbytes==0)
{
close(fd);
closesocket(session->pasv_sockfd);
rt_sprintf(sbuf, "226 Finished.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
break;
}
else if(numbytes==-1)
{
close(fd);
closesocket(session->pasv_sockfd);
rt_free(sbuf);
return -1;
}
}
closesocket(session->pasv_sockfd);
}
else if(str_begin_with(buf, "SIZE")==0)
{
int file_size;
build_full_path(session, parameter_ptr, filename, 256);
file_size = ftp_get_filesize(filename);
if( file_size == -1)
{
rt_sprintf(sbuf, "550 \"%s\" : not a regular file\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else
{
rt_sprintf(sbuf, "213 %d\r\n", file_size);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
}
else if(str_begin_with(buf, "MDTM")==0)
{
rt_sprintf(sbuf, "550 \"/\" : not a regular file\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "SYST")==0)
{
rt_sprintf(sbuf, "215 %s\r\n", "RT-Thread RTOS");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "CWD")==0)
{
build_full_path(session, parameter_ptr, filename, 256);
rt_sprintf(sbuf, "250 Changed to directory \"%s\"\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
strcpy(session->currentdir, filename);
rt_kprintf("Changed to directory %s", filename);
}
else if(str_begin_with(buf, "CDUP")==0)
{
rt_sprintf(filename, "%s/%s", session->currentdir, "..");
rt_sprintf(sbuf, "250 Changed to directory \"%s\"\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
strcpy(session->currentdir, filename);
rt_kprintf("Changed to directory %s", filename);
}
else if(str_begin_with(buf, "PORT")==0)
{
int i;
int portcom[6];
char tmpip[100];
i=0;
portcom[i++]=atoi(strtok(parameter_ptr, ".,;()"));
for(;i<6;i++)
portcom[i]=atoi(strtok(0, ".,;()"));
rt_sprintf(tmpip, "%d.%d.%d.%d", portcom[0], portcom[1], portcom[2], portcom[3]);
FD_ZERO(&readfds);
if((session->pasv_sockfd=socket(AF_INET, SOCK_STREAM, 0))==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
closesocket(session->pasv_sockfd);
session->pasv_active = 0;
rt_free(sbuf);
return 0;
}
pasvremote.sin_addr.s_addr=inet_addr(tmpip);
pasvremote.sin_port=htons(portcom[4] * 256 + portcom[5]);
pasvremote.sin_family=PF_INET;
if(connect(session->pasv_sockfd, (struct sockaddr *)&pasvremote, addr_len)==-1)
{
// is it only local address?try using gloal ip addr
pasvremote.sin_addr=session->remote.sin_addr;
if(connect(session->pasv_sockfd, (struct sockaddr *)&pasvremote, addr_len)==-1)
{
rt_sprintf(sbuf, "425 Can't open data connection.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
closesocket(session->pasv_sockfd);
rt_free(sbuf);
return 0;
}
}
session->pasv_active=1;
session->pasv_port = portcom[4] * 256 + portcom[5];
rt_kprintf("Connected to Data(PORT) %s @ %d\n", tmpip, portcom[4] * 256 + portcom[5]);
rt_sprintf(sbuf, "200 Port Command Successful.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "REST")==0)
{
if(atoi(parameter_ptr)>=0)
{
session->offset=atoi(parameter_ptr);
rt_sprintf(sbuf, "350 Send RETR or STOR to start transfert.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
}
else if(str_begin_with(buf, "MKD")==0)
{
if (session->is_anonymous == RT_TRUE)
{
rt_sprintf(sbuf, "550 Permission denied.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return 0;
}
build_full_path(session, parameter_ptr, filename, 256);
if(mkdir(filename, 0) == -1)
{
rt_sprintf(sbuf, "550 File \"%s\" exists.\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else
{
rt_sprintf(sbuf, "257 directory \"%s\" successfully created.\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
}
else if(str_begin_with(buf, "DELE")==0)
{
if (session->is_anonymous == RT_TRUE)
{
rt_sprintf(sbuf, "550 Permission denied.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return 0;
}
build_full_path(session, parameter_ptr, filename, 256);
if(unlink(filename)==0)
rt_sprintf(sbuf, "250 Successfully deleted file \"%s\".\r\n", filename);
else
{
rt_sprintf(sbuf, "550 Not such file or directory: %s.\r\n", filename);
}
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else if(str_begin_with(buf, "RMD")==0)
{
if (session->is_anonymous == RT_TRUE)
{
rt_sprintf(sbuf, "550 Permission denied.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return 0;
}
build_full_path(session, parameter_ptr, filename, 256);
if(unlink(filename) == -1)
{
rt_sprintf(sbuf, "550 Directory \"%s\" doesn't exist.\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
else
{
rt_sprintf(sbuf, "257 directory \"%s\" successfully deleted.\r\n", filename);
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
}
else if(str_begin_with(buf, "QUIT")==0)
{
rt_sprintf(sbuf, "221 Bye!\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
rt_free(sbuf);
return -1;
}
else
{
rt_sprintf(sbuf, "502 Not Implemented.\r\n");
send(session->sockfd, sbuf, strlen(sbuf), 0);
}
rt_free(sbuf);
return 0;
}
void ftpd_start()
{
rt_thread_t tid;
tid = rt_thread_create("ftpd",
ftpd_thread_entry, RT_NULL,
4096, 30, 5);
if (tid != RT_NULL) rt_thread_startup(tid);
}
#ifdef RT_USING_FINSH
#include <finsh.h>
FINSH_FUNCTION_EXPORT(ftpd_start, start ftp server)
#endif
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