131 lines
3.2 KiB
C
131 lines
3.2 KiB
C
/* This is a simple TCP server that listens on port 1234 and provides lists
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* of files to clients, using a protocol defined in file_server.proto.
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*
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* It directly deserializes and serializes messages from network, minimizing
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* memory use.
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*
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* For flexibility, this example is implemented using posix api.
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* In a real embedded system you would typically use some other kind of
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* a communication and filesystem layer.
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*/
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <netinet/in.h>
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#include <unistd.h>
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#include <dirent.h>
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#include <stdio.h>
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#include <string.h>
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#include <pb_encode.h>
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#include <pb_decode.h>
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#include "fileproto.pb.h"
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#include "common.h"
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bool listdir_callback(pb_ostream_t *stream, const pb_field_t *field, void * const *arg)
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{
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DIR *dir = (DIR*) *arg;
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struct dirent *file;
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FileInfo fileinfo;
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while ((file = readdir(dir)) != NULL)
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{
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fileinfo.inode = file->d_ino;
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strncpy(fileinfo.name, file->d_name, sizeof(fileinfo.name));
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fileinfo.name[sizeof(fileinfo.name) - 1] = '\0';
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if (!pb_encode_tag_for_field(stream, field))
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return false;
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if (!pb_encode_submessage(stream, FileInfo_fields, &fileinfo))
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return false;
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}
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return true;
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}
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void handle_connection(int connfd)
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{
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ListFilesRequest request;
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ListFilesResponse response;
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pb_istream_t input = pb_istream_from_socket(connfd);
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pb_ostream_t output = pb_ostream_from_socket(connfd);
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DIR *directory;
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if (!pb_decode(&input, ListFilesRequest_fields, &request))
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{
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printf("Decode failed: %s\n", PB_GET_ERROR(&input));
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return;
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}
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directory = opendir(request.path);
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printf("Listing directory: %s\n", request.path);
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if (directory == NULL)
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{
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perror("opendir");
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response.has_path_error = true;
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response.path_error = true;
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response.file.funcs.encode = NULL;
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}
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else
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{
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response.has_path_error = false;
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response.file.funcs.encode = &listdir_callback;
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response.file.arg = directory;
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}
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if (!pb_encode(&output, ListFilesResponse_fields, &response))
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{
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printf("Encoding failed.\n");
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}
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}
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int main(int argc, char **argv)
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{
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int listenfd, connfd;
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struct sockaddr_in servaddr;
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int reuse = 1;
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listenfd = socket(AF_INET, SOCK_STREAM, 0);
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setsockopt(listenfd, SOL_SOCKET, SO_REUSEADDR, &reuse, sizeof(reuse));
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memset(&servaddr, 0, sizeof(servaddr));
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servaddr.sin_family = AF_INET;
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servaddr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
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servaddr.sin_port = htons(1234);
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if (bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) != 0)
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{
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perror("bind");
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return 1;
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}
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if (listen(listenfd, 5) != 0)
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{
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perror("listen");
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return 1;
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}
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for(;;)
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{
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connfd = accept(listenfd, NULL, NULL);
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if (connfd < 0)
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{
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perror("accept");
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return 1;
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}
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printf("Got connection.\n");
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handle_connection(connfd);
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printf("Closing connection.\n");
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close(connfd);
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}
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}
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