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raspbootin-server.c
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raspbootin-server.c
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/* Copyright (C) 2013 by John Cronin <jncronin@tysos.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
// Derived from raspbootcom (https://github.com/mrvn/raspbootin)
#define _BSD_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>
#include "crc32.h"
#include "raspbootin.h"
#include "util.h"
#ifdef _WIN32
#include <windows.h>
#else
#include <sys/socket.h>
#include <sys/un.h>
#include <termios.h>
#ifndef UNIX_SOCKETS
#define UNIX_SOCKETS
#endif
#endif // _WIN32
#define READ_BUF_LEN 0x1000
#define SERVER_CAPABILITIES 0x1f
#ifdef _WIN32
typedef HANDLE port_addr;
#else
typedef int port_addr;
#define INVALID_HANDLE_VALUE -1
#endif
static uint32_t magic = MAGIC;
static uint32_t server_caps = SERVER_CAPABILITIES;
static int do_cmd(int cmd_id, port_addr fd);
static int send_error_msg(port_addr fd, int error_code);
#ifdef UNIX_SOCKETS
static struct sockaddr *sock_addr;
static socklen_t addrlen;
#endif
char *base_dir = NULL;
static inline ssize_t serial_write(port_addr fd, const void *buf, size_t count)
{
#ifdef _WIN32
ssize_t ret = 0;
int wf_ret = WriteFile(fd, buf, (DWORD)count, (LPDWORD)&ret, NULL);
if(wf_ret == 0)
{
fprintf(stderr, "WriteFile() failed: %08x\n", GetLastError());
return 0;
}
return ret;
#else
return write(fd, buf, count);
#endif
}
static inline ssize_t serial_read(port_addr fd, void *buf, size_t count)
{
#ifdef _WIN32
ssize_t ret = 0;
int rf_ret = ReadFile(fd, buf, (DWORD)count, (LPDWORD)&ret, NULL);
if(rf_ret == 0)
{
fprintf(stderr, "ReadFile() failed: %08x\n", GetLastError());
return 0;
}
return ret;
#else
return read(fd, buf, count);
#endif
}
#ifdef UNIX_SOCKETS
static port_addr wait_connection(port_addr fd)
{
// Check fd type
struct stat buf;
if(fstat(fd, &buf) < 0)
{
fprintf(stderr, "Error calling fstat(), errno = %i\n", errno);
return -1;
}
if(S_ISSOCK(buf.st_mode))
{
// Put in listening mode
int ret = listen(fd, 1);
if(ret == -1)
{
fprintf(stderr, "Error calling listen(), errno = %i\n", errno);
return -1;
}
// Accept the next connection
ret = accept(fd, sock_addr, &addrlen);
if(ret == -1)
{
fprintf(stderr, "Error calling accept(), errno = %i\n", errno);
return -1;
}
return fd;
}
else
return fd;
}
#else
#define wait_connection(a) (a)
#endif
static port_addr open_serial(const char *dev)
{
// Decide on the type of the file
#ifdef UNIX_SOCKETS
struct stat stat_buf;
int stat_ret = stat(dev, &stat_buf);
int is_socket = 0;
if((stat_ret == -1) && (errno == ENOENT))
is_socket = 1;
else if((stat_ret == 0) && S_ISSOCK(stat_buf.st_mode))
is_socket = 1;
if(is_socket)
{
// Open a unix domain socket
unlink(dev);
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if(fd == -1)
{
fprintf(stderr, "Error creating unix domain socket, errno = %i\n",
errno);
return -1;
}
// Prepare the address structure
struct sockaddr_un *address;
address = (struct sockaddr_un *)malloc(sizeof(struct sockaddr_un));
sock_addr = (struct sockaddr *)address;
memset(address, 0, sizeof(struct sockaddr_un));
address->sun_family = AF_UNIX;
strncpy(address->sun_path, dev, sizeof(address->sun_path));
addrlen = sizeof(struct sockaddr_un);
// Bind to the socket
int bind_ret = bind(fd, sock_addr, sizeof(struct sockaddr_un));
if(bind_ret == -1)
{
fprintf(stderr, "Error binding to unix domain socket, errno = %i\n",
errno);
return -1;
}
// Wait for a new connection
return wait_connection(fd);
}
else
#endif
{
#ifdef _WIN32
port_addr fd = CreateFile(dev, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING, FILE_FLAG_NO_BUFFERING, NULL);
if(fd == INVALID_HANDLE_VALUE)
{
fprintf(stderr, "Error opening %s, error: %08x\n", dev, GetLastError());
return fd;
}
DCB config;
if(GetCommState(fd, &config) == 0)
{
fprintf(stderr, "Error calling GetCommState, error %08x\n", GetLastError());
return INVALID_HANDLE_VALUE;
}
// Set the port settings
config.BaudRate = 115200;
config.ByteSize = 8;
config.Parity = NOPARITY;
config.StopBits = ONESTOPBIT;
if(SetCommState(fd, &config) == 0)
{
fprintf(stderr, "Error calling SetCommState, error %08x\n", GetLastError());
return INVALID_HANDLE_VALUE;
}
// Set the timeouts
COMMTIMEOUTS timeouts;
timeouts.ReadIntervalTimeout = 1;
timeouts.ReadTotalTimeoutMultiplier = 1;
timeouts.ReadTotalTimeoutConstant = 1;
timeouts.WriteTotalTimeoutMultiplier = 1;
timeouts.WriteTotalTimeoutConstant = 1;
if(SetCommTimeouts(fd, &timeouts) == 0)
{
fprintf(stderr, "Error calling SetCommTimeouts, error %08x\n",
GetLastError());
return INVALID_HANDLE_VALUE;
}
return fd;
#else
// The termios structure, to be configured for serial interface
struct termios termios;
// Open the device, read only
int fd = open(dev, O_RDWR | O_NOCTTY);
if(fd == -1)
{
// failed to open
return -1;
}
// Must be a tty to continue set-up, otherwise assume pipe
if(!isatty(fd))
return fd;
// Get the attributes
if(tcgetattr(fd, &termios) == -1)
{
fprintf(stderr, "Failed to get attributes of device %s\n", dev);
return -1;
}
// Poll only
termios.c_cc[VTIME] = 0;
termios.c_cc[VMIN] = 0;
// 8N1 mode
termios.c_iflag = 0;
termios.c_oflag = 0;
termios.c_cflag = CS8 | CREAD | CLOCAL;
termios.c_lflag = 0;
// Set 115200 baud
if((cfsetispeed(&termios, B115200) < 0) ||
(cfsetospeed(&termios, B115200) < 0))
{
fprintf(stderr, "Failed to set baud rate\n");
return -1;
}
// Write the attributes
if(tcsetattr(fd, TCSAFLUSH, &termios) == -1)
{
fprintf(stderr, "Failed to write attributes\n");
return -1;
}
return fd;
#endif
}
}
int main(int argc, char *argv[])
{
(void)argc;
port_addr fd = INVALID_HANDLE_VALUE;
base_dir = argv[2];
// Open the serial device
while(fd == INVALID_HANDLE_VALUE)
{
fd = open_serial(argv[1]);
#ifndef _WIN32
if((fd == INVALID_HANDLE_VALUE) && ((errno == ENOENT) || (errno == ENODEV)))
{
fprintf(stderr, "Waiting for %s\n", argv[1]);
sleep(1);
continue;
}
else
#endif
if(fd == INVALID_HANDLE_VALUE)
{
fprintf(stderr, "Error opening %s\n", argv[1]);
return -1;
}
}
uint8_t buf;
int breaks_read = 0;
for(;;)
{
int bytes_read = serial_read(fd, &buf, 1);
if(bytes_read > 0)
{
if(breaks_read == 2)
{
int cmd = (int)buf;
do_cmd(cmd, fd);
breaks_read = 0;
// Pause to let the client read the message
usleep(10000);
}
else if(buf == '\003')
breaks_read++;
else
{
breaks_read = 0;
putchar(buf);
}
}
}
return 0;
}
static int do_cmd(int cmd, port_addr fd)
{
switch(cmd)
{
case 0:
{
// Identify command
// Read the command crc
uint32_t ccrc;
serial_read(fd, &ccrc, 4);
uint32_t eccrc = crc32((void *)0, 0);
if(ccrc != eccrc)
return send_error_msg(fd, CRC_ERROR);
// Set the response length and error code
uint32_t resp_length = 12;
uint32_t error_code = SUCCESS;
// Build the response crc
uint32_t crc = crc32_start();
crc = crc32_append(crc, &magic, 4);
crc = crc32_append(crc, &resp_length, 4);
crc = crc32_append(crc, &error_code, 4);
crc = crc32_append(crc, &server_caps, 4);
crc = crc32_finish(crc);
// Send the response
serial_write(fd, &magic, 4);
serial_write(fd, &resp_length, 4);
serial_write(fd, &error_code, 4);
serial_write(fd, &server_caps, 4);
serial_write(fd, &crc, 4);
fprintf(stderr, "Sent CMD0 response\n");
return 0;
}
case 1:
{
// Read directory
uint32_t eccrc = crc32_start();
// Read the directory name
uint16_t dir_name_len;
serial_read(fd, &dir_name_len, 2);
eccrc = crc32_append(eccrc, &dir_name_len, 2);
char *dir_name = (char *)malloc((int)dir_name_len + 1);
memset(dir_name, 0, dir_name_len + 1);
serial_read(fd, dir_name, (size_t)dir_name_len);
eccrc = crc32_append(eccrc, dir_name, (size_t)dir_name_len);
eccrc = crc32_finish(eccrc);
// Read the command crc
uint32_t ccrc;
serial_read(fd, &ccrc, 4);
if(ccrc != eccrc)
return send_error_msg(fd, CRC_ERROR);
// Append the requested dir to the base dir
int full_dir_len = strlen(base_dir) + 1 + dir_name_len + 1;
char *full_dir = (char *)malloc(full_dir_len);
memset(full_dir, 0, full_dir_len);
strcat(full_dir, base_dir);
strcat(full_dir, "/");
strcat(full_dir, dir_name);
// Try and read the requested directory
DIR *dirp = opendir(full_dir);
if(dirp == NULL)
{
free(dir_name);
free(full_dir);
if((errno == ENOENT) || (errno == ENOTDIR))
return send_error_msg(fd, PATH_NOT_FOUND);
else
return send_error_msg(fd, UNKNOWN_ERROR);
}
// Count the directory entries
int byte_count = 0;
uint32_t entry_count = 0;
struct dirent *de;
while((de = readdir(dirp)) != NULL)
{
// Add space for byte_size, user_id, group_id
// and props fields
byte_count += 16;
// Add space for name string
byte_count += 2;
byte_count += strlen(de->d_name);
entry_count++;
}
rewinddir(dirp);
// Allocate the buffer to send
uint8_t *buf = (uint8_t *)malloc(byte_count);
int bptr = 0;
// Fill in the buffer
uint32_t entries_filled = 0;
while((de = readdir(dirp)) != NULL)
{
// Build a string of the whole filename
int fname_len = strlen(de->d_name);
int path_len = full_dir_len + 1 + fname_len + 1;
char *path = (char *)malloc(path_len);
memset(path, 0, path_len);
strcat(path, full_dir);
strcat(path, "/");
strcat(path, de->d_name);
// Get the file stats
struct stat stat_buf;
if(stat(path, &stat_buf) != 0)
{
fprintf(stderr, "Error running fstat on %s, errno = %i\n",
path, errno);
free(path);
free(buf);
free(full_dir);
free(dir_name);
return send_error_msg(fd, UNKNOWN_ERROR);
}
// Fill in the buffer
write_word((uint32_t)stat_buf.st_size, buf, bptr);
write_word((uint32_t)stat_buf.st_uid, buf, bptr + 4);
write_word((uint32_t)stat_buf.st_gid, buf, bptr + 8);
write_word((uint32_t)stat_buf.st_mode, buf, bptr + 12);
bptr += 16;
// Fill in the name
write_halfword((uint16_t)dir_name_len, buf, bptr);
bptr += 2;
memcpy(&buf[bptr], de->d_name, dir_name_len);
bptr += dir_name_len;
free(path);
entries_filled++;
}
if(entries_filled != entry_count)
{
// An error has occurred re-parsing the directory
fprintf(stderr, "entries_filled (%i) != entry_count (%i)\n",
entries_filled, entry_count);
free(buf);
free(dir_name);
free(full_dir);
send_error_msg(fd, UNKNOWN_ERROR);
}
fprintf(stderr, "SERVER: %i directory entries, byte_count %i\n", entry_count, byte_count);
// Set the response length and error code
uint32_t resp_length = 16 + byte_count;
uint32_t error_code = SUCCESS;
uint32_t dir_entry_version = 0;
// Build the response crc
uint32_t crc = crc32_start();
crc = crc32_append(crc, &magic, 4);
crc = crc32_append(crc, &resp_length, 4);
crc = crc32_append(crc, &error_code, 4);
crc = crc32_append(crc, &entry_count, 4);
crc = crc32_append(crc, &dir_entry_version, 4);
crc = crc32_append(crc, buf, byte_count);
crc = crc32_finish(crc);
// Send the response
serial_write(fd, &magic, 4);
serial_write(fd, &resp_length, 4);
serial_write(fd, &error_code, 4);
serial_write(fd, &entry_count, 4);
serial_write(fd, &dir_entry_version, 4);
serial_write(fd, buf, byte_count);
serial_write(fd, &crc, 4);
fprintf(stderr, "Sent CMD1 response\n");
free(buf);
free(dir_name);
free(full_dir);
return 0;
}
}
(void)fd;
return 0;
}
static int send_error_msg(port_addr fd, int error_code)
{
// Send a fail response - <magic><resp_length = 8><error_code><crc>
uint32_t resp_length = 8;
uint32_t crc = crc32_start();
crc = crc32_append(crc, &magic, 4);
crc = crc32_append(crc, &resp_length, 4);
crc = crc32_append(crc, &error_code, 4);
crc = crc32_finish(crc);
serial_write(fd, &magic, 4);
serial_write(fd, &resp_length, 4);
serial_write(fd, &error_code, 4);
serial_write(fd, &crc, 4);
fprintf(stderr, "Sent ERROR %i response\n", error_code);
return 0;
}