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/* This is a simple TCP client that connects to port 1234 and prints a list
* of files in a given directory.
*
* It directly deserializes and serializes messages from network, minimizing
* memory use.
*
* For flexibility, this example is implemented using posix api.
* In a real embedded system you would typically use some other kind of
* a communication and filesystem layer.
*/
#include <sys/socket.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <unistd.h>
#include <dirent.h>
#include <stdio.h>
#include <string.h>
#include <pb_encode.h>
#include <pb_decode.h>
#include "fileproto.pb.h"
#include "common.h"
bool printfile_callback(pb_istream_t *stream, const pb_field_t *field, void **arg)
{
FileInfo fileinfo;
if (!pb_decode(stream, FileInfo_fields, &fileinfo))
return false;
printf("%-10lld %s\n", (long long)fileinfo.inode, fileinfo.name);
return true;
}
bool listdir(int fd, char *path)
{
ListFilesRequest request;
ListFilesResponse response;
pb_istream_t input = pb_istream_from_socket(fd);
pb_ostream_t output = pb_ostream_from_socket(fd);
uint8_t zero = 0;
if (path == NULL)
{
request.has_path = false;
}
else
{
request.has_path = true;
if (strlen(path) + 1 > sizeof(request.path))
{
fprintf(stderr, "Too long path.\n");
return false;
}
strcpy(request.path, path);
}
if (!pb_encode(&output, ListFilesRequest_fields, &request))
{
fprintf(stderr, "Encoding failed.\n");
return false;
}
/* We signal the end of request with a 0 tag. */
pb_write(&output, &zero, 1);
response.file.funcs.decode = &printfile_callback;
if (!pb_decode(&input, ListFilesResponse_fields, &response))
{
fprintf(stderr, "Decode failed: %s\n", PB_GET_ERROR(&input));
return false;
}
if (response.path_error)
{
fprintf(stderr, "Server reported error.\n");
return false;
}
return true;
}
int main(int argc, char **argv)
{
int sockfd;
struct sockaddr_in servaddr;
char *path = NULL;
if (argc > 1)
path = argv[1];
sockfd = socket(AF_INET, SOCK_STREAM, 0);
memset(&servaddr, 0, sizeof(servaddr));
servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
servaddr.sin_port = htons(1234);
if (connect(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0)
{
perror("connect");
return 1;
}
if (!listdir(sockfd, path))
return 2;
close(sockfd);
return 0;
}
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