2 #include <linux/types.h>
17 #include <sys/ioctl.h>
18 #include <sys/types.h>
23 #include <linux/auto_fs4.h>
25 #include "include/log.h"
26 #include "include/sys.h"
27 #include "include/timer.h"
28 #include "include/mount.h"
29 #include "include/signal.h"
30 #include "include/ucix.h"
31 #include "include/autofs.h"
33 static int fdin = 0; /* data coming out of the kernel */
34 static int fdout = 0;/* data going into the kernel */
35 static bool term = false;
38 static time_t uci_timeout;
41 static void umount_autofs(void)
43 system_printf("umount %s 2> /dev/null", "/tmp/run/mountd/");
46 static int mount_autofs(void)
50 log_printf("trying to mount %s as the autofs root\n", "/tmp/run/mountd/");
51 if(is_mounted(0, "/tmp/run/mountd/"))
53 log_printf("%s is already mounted\n", "/tmp/run/mountd/");
57 mkdir("/tmp/run/mountd/", 0555);
60 log_printf("failed to get kernel pipe\n");
63 if(system_printf("/bin/mount -t autofs -o fd=%d,pgrp=%u,minproto=5,maxproto=5 \"mountd(pid%u)\" %s",
64 pipefd[1], (unsigned) getpgrp(), getpid(), "/tmp/run/mountd/") != 0)
66 log_printf("unable to mount autofs on %s\n", "/tmp/run/mountd/");
75 fdin = open("/tmp/run/mountd/", O_RDONLY);
81 stat("/tmp/run/mountd/", &st);
85 static void send_ready(unsigned int wait_queue_token)
87 if(ioctl(fdin, AUTOFS_IOC_READY, wait_queue_token) < 0)
88 log_printf("failed to report ready to kernel\n");
91 static void send_fail(unsigned int wait_queue_token)
93 if(ioctl(fdin, AUTOFS_IOC_FAIL, wait_queue_token) < 0)
94 log_printf("failed to report fail to kernel\n");
97 static int autofs_process_request(const struct autofs_v5_packet *pkt)
100 log_printf("kernel is requesting a mount -> %s\n", pkt->name);
101 chdir("/tmp/run/mountd/");
102 if (lstat(pkt->name, &st) == -1 || (S_ISDIR(st.st_mode) && st.st_dev == dev)) {
103 if(!mount_new("/tmp/run/mountd/", (char*)pkt->name))
105 send_ready(pkt->wait_queue_token);
107 send_fail(pkt->wait_queue_token);
108 log_printf("failed to mount %s\n", pkt->name);
111 send_ready(pkt->wait_queue_token);
118 static void expire_proc(void)
120 struct autofs_packet_expire pkt;
121 while(ioctl(fdin, AUTOFS_IOC_EXPIRE, &pkt) == 0)
122 mount_remove("/tmp/run/mountd/", pkt.name);
125 static int fullread(void *ptr, size_t len)
127 char *buf = (char *) ptr;
130 ssize_t r = read(fdout, buf, len);
143 static int autofs_in(union autofs_v5_packet_union *pkt)
146 struct pollfd fds[1];
149 fds[0].events = POLLIN;
153 res = poll(fds, 1, -1);
159 log_printf("failed while trying to read packet from kernel\n");
162 else if ((res > 0) && (fds[0].revents & POLLIN))
164 return fullread(pkt, sizeof(*pkt));
170 pid_t autofs_safe_fork(void)
181 static void autofs_cleanup(void)
188 static void autofs_end_handler(int sig)
193 static void autofs_init(void)
197 struct uci_context *ctx;
198 signal_init(autofs_end_handler);
199 ctx = ucix_init("mountd");
200 uci_timeout = ucix_get_option_int(ctx, "mountd", "mountd", "timeout", 60);
201 p = ucix_get_option(ctx, "mountd", "mountd", "path");
204 snprintf(uci_path, 31, "%s", p);
206 snprintf(uci_path, 31, "/tmp/mounts/");
208 mkdir("/tmp/run/", 0555);
209 mkdir("/tmp/mounts", 0555);
210 system_printf("rm -rf %s*", uci_path);
215 if(mount_autofs() < 0)
220 ioctl(fdin, AUTOFS_IOC_PROTOVER, &kproto_version);
221 if(kproto_version != 5)
223 log_printf("only kernel protocol version 5 is tested. You have %d.\n",
228 ioctl(fdin, AUTOFS_IOC_SETTIMEOUT, &uci_timeout);
229 timer_add(expire_proc, 15);
232 int autofs_loop(void)
238 union autofs_v5_packet_union pkt;
243 log_printf("Got a autofs packet\n");
244 if(pkt.hdr.type == autofs_ptype_missing_indirect)
245 autofs_process_request(&pkt.missing_indirect);
247 log_printf("unknown packet type %d\n", pkt.hdr.type);
251 log_printf("... quitting\n");