| /* 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; |
| } |