2 * All rights reserved. See COPYRIGHT.
4 * IPC over socketpair between parent and children.
11 #include <sys/types.h>
18 #include <sys/socket.h>
23 #include <atalk/server_child.h>
24 #include <atalk/server_ipc.h>
25 #include <atalk/logger.h>
26 #include <atalk/util.h>
27 #include <atalk/errchk.h>
29 #define IPC_HEADERLEN 14
30 #define IPC_MAXMSGSIZE 90
32 typedef struct ipc_header {
39 uint16_t DSI_requestID;
42 static char *ipc_cmd_str[] = { "IPC_DISCOLDSESSION",
46 * Pass afp_socket to old disconnected session if one has a matching token (token = pid)
47 * @returns -1 on error, 0 if no matching session was found, 1 if session was found and socket passed
49 static int ipc_kill_token(struct ipc_header *ipc, server_child *children)
53 if (ipc->len != sizeof(pid_t)) {
56 /* assume signals SA_RESTART set */
57 memcpy (&pid, ipc->msg, sizeof(pid_t));
59 return server_child_transfer_session(children,
67 /* ----------------- */
68 static int ipc_get_session(struct ipc_header *ipc, server_child *children)
75 if (ipc->len < (sizeof(idlen) + sizeof(boottime)) )
79 memcpy (&idlen, p, sizeof(idlen));
80 idlen = ntohl (idlen);
83 memcpy (&boottime, p, sizeof(boottime));
84 p += sizeof(boottime);
86 if (ipc->len < idlen + sizeof(idlen) + sizeof(boottime))
89 if (NULL == (clientid = (char*) malloc(idlen)) )
91 memcpy (clientid, p, idlen);
93 LOG(log_debug, logtype_afpd, "ipc_get_session(pid: %u, uid: %u, time: 0x%08x)",
94 ipc->child_pid, ipc->uid, boottime);
96 server_child_kill_one_by_id(children,
107 /***********************************************************************************
109 ***********************************************************************************/
112 * Listen on UNIX domain socket "name" for IPD from old sesssion
114 * @args name (r) file name to use for UNIX domain socket
115 * @returns socket fd, -1 on error
117 int ipc_server_uds(const char *name)
120 struct sockaddr_un address;
121 socklen_t address_length;
124 EC_NEG1_LOG( fd = socket(PF_UNIX, SOCK_STREAM, 0) );
125 EC_ZERO_LOG( setnonblock(fd, 1) );
127 address.sun_family = AF_UNIX;
128 address_length = sizeof(address.sun_family) + sprintf(address.sun_path, name);
129 EC_ZERO_LOG( bind(fd, (struct sockaddr *)&address, address_length) );
130 EC_ZERO_LOG( listen(fd, 1024) );
137 LOG(log_note, logtype_afpd, "ipc_server_uds: fd: %d", fd);
150 * Read a IPC message from a child
152 * @args children (rw) pointer to our structure with all childs
153 * @args fd (r) IPC socket with child
155 * @returns number of bytes transfered, -1 on error, 0 on EOF
157 int ipc_server_read(server_child *children, int fd)
160 struct ipc_header ipc;
161 char buf[IPC_MAXMSGSIZE], *p;
163 if ((ret = read(fd, buf, IPC_HEADERLEN)) != IPC_HEADERLEN) {
164 LOG(log_error, logtype_afpd, "Reading IPC header failed (%i of %u bytes read): %s",
165 ret, IPC_HEADERLEN, strerror(errno));
171 memcpy(&ipc.command, p, sizeof(ipc.command));
172 p += sizeof(ipc.command);
174 memcpy(&ipc.child_pid, p, sizeof(ipc.child_pid));
175 p += sizeof(ipc.child_pid);
177 memcpy(&ipc.uid, p, sizeof(ipc.uid));
178 p += sizeof(ipc.uid);
180 memcpy(&ipc.len, p, sizeof(ipc.len));
182 /* This should never happen */
183 if (ipc.len > (IPC_MAXMSGSIZE - IPC_HEADERLEN)) {
184 LOG (log_info, logtype_afpd, "IPC message exceeds allowed size (%u)", ipc.len);
188 memset (buf, 0, IPC_MAXMSGSIZE);
190 if ((ret = read(fd, buf, ipc.len)) != (int) ipc.len) {
191 LOG(log_info, logtype_afpd, "Reading IPC message failed (%u of %u bytes read): %s",
192 ret, ipc.len, strerror(errno));
198 LOG(log_debug, logtype_afpd, "ipc_server_read(%s): pid: %u",
199 ipc_cmd_str[ipc.command], ipc.child_pid);
203 switch (ipc.command) {
205 case IPC_DISCOLDSESSION:
206 if (readt(fd, &ipc.DSI_requestID, 2, 0, 2) != 2) {
207 LOG (log_error, logtype_afpd, "ipc_read(%s:child[%u]): couldnt read DSI id: %s",
208 ipc_cmd_str[ipc.command], ipc.child_pid, strerror(errno));
210 if ((ipc.afp_socket = recv_fd(fd, 1)) == -1) {
211 LOG (log_error, logtype_afpd, "ipc_read(%s:child[%u]): recv_fd: %s",
212 ipc_cmd_str[ipc.command], ipc.child_pid, strerror(errno));
215 if (ipc_kill_token(&ipc, children) == 1) {
216 /* Transfered session (ie afp_socket) to old disconnected child, now kill the new one */
217 LOG(log_note, logtype_afpd, "Reconnect: killing new session child[%u] after transfer",
219 kill(ipc.child_pid, SIGTERM);
221 close(ipc.afp_socket);
225 if (ipc_get_session(&ipc, children) != 0)
230 LOG (log_info, logtype_afpd, "ipc_read: unknown command: %d", ipc.command);
237 /* ----------------- */
238 int ipc_child_write(int fd, uint16_t command, int len, void *msg)
240 char block[IPC_MAXMSGSIZE], *p;
245 memset ( p, 0 , IPC_MAXMSGSIZE);
246 if (len + IPC_HEADERLEN > IPC_MAXMSGSIZE)
249 memcpy(p, &command, sizeof(command));
250 p += sizeof(command);
253 memcpy(p, &pid, sizeof(pid_t));
257 * using uid is wrong. It will not disconnect if the new connection
258 * is with a different user.
259 * But we really don't want a remote kill command.
262 memcpy(p, &uid, sizeof(uid_t));
270 LOG(log_debug, logtype_afpd, "ipc_child_write(%s)", ipc_cmd_str[command]);
272 return write(fd, block, len+IPC_HEADERLEN );