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https://gitlab.nic.cz/labs/bird.git
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e454916149
Pull out routines for interacting with the server and interpreting internal commands which are not dependent on libreadline and ncurses libraries. This is a preparation step for a new lightweight birdc client.
180 lines
3.3 KiB
C
180 lines
3.3 KiB
C
/*
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* BIRD Client
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*
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* (c) 1999--2004 Martin Mares <mj@ucw.cz>
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* (c) 2013 Tomas Hlavacek <tmshlvck@gmail.com>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/socket.h>
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#include <sys/un.h>
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#include <sys/types.h>
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#include "nest/bird.h"
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#include "lib/resource.h"
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#include "lib/string.h"
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#include "client/client.h"
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#include "sysdep/unix/unix.h"
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char *server_path = PATH_CONTROL_SOCKET;
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int server_fd;
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byte server_read_buf[SERVER_READ_BUF_LEN];
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byte *server_read_pos = server_read_buf;
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int input_initialized;
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int input_hidden_end;
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int cstate = STATE_CMD_SERVER;
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int nstate = STATE_CMD_SERVER;
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int num_lines, skip_input, interactive;
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/*** Input ***/
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int
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handle_internal_command(char *cmd)
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{
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if (!strncmp(cmd, "exit", 4) || !strncmp(cmd, "quit", 4))
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{
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cleanup();
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exit(0);
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}
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if (!strncmp(cmd, "help", 4))
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{
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puts("Press `?' for context sensitive help.");
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return 1;
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}
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return 0;
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}
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void
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submit_server_command(char *cmd)
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{
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server_send(cmd);
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nstate = STATE_CMD_SERVER;
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num_lines = 2;
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}
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/*** Communication with server ***/
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void
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server_connect(void)
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{
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struct sockaddr_un sa;
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server_fd = socket(AF_UNIX, SOCK_STREAM, 0);
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if (server_fd < 0)
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die("Cannot create socket: %m");
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if (strlen(server_path) >= sizeof(sa.sun_path))
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die("server_connect: path too long");
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bzero(&sa, sizeof(sa));
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sa.sun_family = AF_UNIX;
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strcpy(sa.sun_path, server_path);
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if (connect(server_fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) < 0)
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die("Unable to connect to server control socket (%s): %m", server_path);
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if (fcntl(server_fd, F_SETFL, O_NONBLOCK) < 0)
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die("fcntl: %m");
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}
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void
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server_read(void)
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{
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int c;
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byte *start, *p;
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redo:
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c = read(server_fd, server_read_pos, server_read_buf + sizeof(server_read_buf) - server_read_pos);
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if (!c)
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die("Connection closed by server.");
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if (c < 0)
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{
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if (errno == EINTR)
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goto redo;
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else
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die("Server read error: %m");
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}
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start = server_read_buf;
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p = server_read_pos;
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server_read_pos += c;
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while (p < server_read_pos)
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if (*p++ == '\n')
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{
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p[-1] = 0;
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server_got_reply(start);
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start = p;
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}
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if (start != server_read_buf)
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{
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int l = server_read_pos - start;
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memmove(server_read_buf, start, l);
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server_read_pos = server_read_buf + l;
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}
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else if (server_read_pos == server_read_buf + sizeof(server_read_buf))
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{
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strcpy(server_read_buf, "?<too-long>");
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server_read_pos = server_read_buf + 11;
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}
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}
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void
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wait_for_write(int fd)
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{
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while (1)
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{
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int rv;
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fd_set set;
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FD_ZERO(&set);
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FD_SET(fd, &set);
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rv = select(fd+1, NULL, &set, NULL, NULL);
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if (rv < 0)
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{
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if (errno == EINTR)
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continue;
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else
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die("select: %m");
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}
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if (FD_ISSET(server_fd, &set))
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return;
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}
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}
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void
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server_send(char *cmd)
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{
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int l = strlen(cmd);
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byte *z = alloca(l + 1);
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memcpy(z, cmd, l);
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z[l++] = '\n';
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while (l)
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{
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int cnt = write(server_fd, z, l);
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if (cnt < 0)
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{
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if (errno == EAGAIN)
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wait_for_write(server_fd);
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else if (errno == EINTR)
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continue;
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else
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die("Server write error: %m");
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}
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else
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{
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l -= cnt;
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z += cnt;
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}
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}
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}
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