2 * All rights reserved. See COPYRIGHT.
4 * IPC over socketpair between parent and children.
11 #include <sys/types.h>
18 #include <sys/socket.h>
22 #include <atalk/server_child.h>
23 #include <atalk/server_ipc.h>
24 #include <atalk/logger.h>
25 #include <atalk/util.h>
27 typedef struct ipc_header {
34 uint16_t DSI_requestID;
37 static char *ipc_cmd_str[] = { "IPC_DISCOLDSESSION",
41 * Pass afp_socket to old disconnected session if one has a matching token (token = pid)
42 * @returns -1 on error, 0 if no matching session was found, 1 if session was found and socket passed
44 static int ipc_kill_token(struct ipc_header *ipc, server_child *children)
48 if (ipc->len != sizeof(pid_t)) {
51 /* assume signals SA_RESTART set */
52 memcpy (&pid, ipc->msg, sizeof(pid_t));
54 return server_child_transfer_session(children,
62 /* ----------------- */
63 static int ipc_get_session(struct ipc_header *ipc, server_child *children)
70 if (ipc->len < (sizeof(idlen) + sizeof(boottime)) )
74 memcpy (&idlen, p, sizeof(idlen));
75 idlen = ntohl (idlen);
78 memcpy (&boottime, p, sizeof(boottime));
79 p += sizeof(boottime);
81 if (ipc->len < idlen + sizeof(idlen) + sizeof(boottime))
84 if (NULL == (clientid = (char*) malloc(idlen)) )
86 memcpy (clientid, p, idlen);
88 LOG (log_debug, logtype_afpd, "ipc_get_session(pid: %u, uid: %u, time %x)",
89 ipc->child_pid, ipc->uid, boottime);
91 server_child_kill_one_by_id(children,
102 #define IPC_HEADERLEN 14
103 #define IPC_MAXMSGSIZE 90
114 * Read a IPC message from a child
116 * @args children (rw) pointer to our structure with all childs
117 * @args fd (r) IPC socket with child
119 * @returns number of bytes transfered, -1 on error, 0 on EOF
121 int ipc_server_read(server_child *children, int fd)
124 struct ipc_header ipc;
125 char buf[IPC_MAXMSGSIZE], *p;
127 if ((ret = read(fd, buf, IPC_HEADERLEN)) != IPC_HEADERLEN) {
128 LOG(log_error, logtype_afpd, "Reading IPC header failed (%i of %u bytes read): %s",
129 ret, IPC_HEADERLEN, strerror(errno));
135 memcpy(&ipc.command, p, sizeof(ipc.command));
136 p += sizeof(ipc.command);
138 memcpy(&ipc.child_pid, p, sizeof(ipc.child_pid));
139 p += sizeof(ipc.child_pid);
141 memcpy(&ipc.uid, p, sizeof(ipc.uid));
142 p += sizeof(ipc.uid);
144 memcpy(&ipc.len, p, sizeof(ipc.len));
146 /* This should never happen */
147 if (ipc.len > (IPC_MAXMSGSIZE - IPC_HEADERLEN)) {
148 LOG (log_info, logtype_afpd, "IPC message exceeds allowed size (%u)", ipc.len);
152 memset (buf, 0, IPC_MAXMSGSIZE);
154 if ((ret = read(fd, buf, ipc.len)) != (int) ipc.len) {
155 LOG(log_info, logtype_afpd, "Reading IPC message failed (%u of %u bytes read): %s",
156 ret, ipc.len, strerror(errno));
162 LOG(log_debug, logtype_afpd, "ipc_server_read(%s): pid: %u",
163 ipc_cmd_str[ipc.command], ipc.child_pid);
167 switch (ipc.command) {
169 case IPC_DISCOLDSESSION:
170 if (readt(fd, &ipc.DSI_requestID, 2, 0, 2) != 2) {
171 LOG (log_error, logtype_afpd, "ipc_read(%s:child[%u]): couldnt read DSI id: %s",
172 ipc_cmd_str[ipc.command], ipc.child_pid, strerror(errno));
174 if ((ipc.afp_socket = recv_fd(fd, 1)) == -1) {
175 LOG (log_error, logtype_afpd, "ipc_read(%s:child[%u]): recv_fd: %s",
176 ipc_cmd_str[ipc.command], ipc.child_pid, strerror(errno));
179 if (ipc_kill_token(&ipc, children) == 1) {
180 /* Transfered session (ie afp_socket) to old disconnected child, now kill the new one */
181 LOG(log_note, logtype_afpd, "Reconnect: killing new session child[%u] after transfer",
183 kill(ipc.child_pid, SIGTERM);
185 close(ipc.afp_socket);
189 if (ipc_get_session(&ipc, children) != 0)
194 LOG (log_info, logtype_afpd, "ipc_read: unknown command: %d", ipc.command);
201 /* ----------------- */
202 int ipc_child_write(int fd, uint16_t command, int len, void *msg)
204 char block[IPC_MAXMSGSIZE], *p;
209 memset ( p, 0 , IPC_MAXMSGSIZE);
210 if (len + IPC_HEADERLEN > IPC_MAXMSGSIZE)
213 memcpy(p, &command, sizeof(command));
214 p += sizeof(command);
217 memcpy(p, &pid, sizeof(pid_t));
221 * using uid is wrong. It will not disconnect if the new connection
222 * is with a different user.
223 * But we really don't want a remote kill command.
226 memcpy(p, &uid, sizeof(uid_t));
234 LOG(log_debug, logtype_afpd, "ipc_child_write(%s)", ipc_cmd_str[command]);
236 return write(fd, block, len+IPC_HEADERLEN );