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1 | /***************************************************************************** |
2 | Copyright (c) 2006 EMC Corporation. | |
3 | ||
4 | This program is free software; you can redistribute it and/or modify it | |
5 | under the terms of the GNU General Public License as published by the Free | |
6 | Software Foundation; either version 2 of the License, or (at your option) | |
7 | any later version. | |
8 | ||
9 | This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | more details. | |
13 | ||
14 | You should have received a copy of the GNU General Public License along with | |
15 | this program; if not, write to the Free Software Foundation, Inc., 59 | |
16 | Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | ||
18 | The full GNU General Public License is included in this distribution in the | |
19 | file called LICENSE. | |
20 | ||
21 | Authors: Srinivas Aji <Aji_Srinivas@emc.com> | |
22 | ||
23 | ******************************************************************************/ | |
24 | ||
25 | #include "ctl_socket.h" | |
26 | #include <sys/stat.h> | |
27 | #include <sys/types.h> | |
28 | #include <sys/socket.h> | |
29 | #include <sys/un.h> | |
30 | #include <unistd.h> | |
31 | #include <sys/poll.h> | |
32 | #include <stdio.h> | |
33 | #include <stdlib.h> | |
34 | ||
35 | #include "log.h" | |
36 | ||
37 | static int fd = -1; | |
38 | ||
39 | int ctl_client_init(void) | |
40 | { | |
41 | struct sockaddr_un sa_svr; | |
42 | int s; | |
43 | TST (strlen(RSTP_SERVER_SOCK_NAME) < sizeof(sa_svr.sun_path), -1); | |
44 | ||
45 | s = socket(PF_UNIX, SOCK_DGRAM, 0); | |
46 | if (s < 0) { | |
47 | ERROR("Couldn't open unix socket: %m"); | |
48 | return -1; | |
49 | } | |
50 | ||
51 | set_socket_address(&sa_svr, RSTP_SERVER_SOCK_NAME); | |
52 | ||
53 | struct sockaddr_un sa; | |
54 | char tmpname[64]; | |
55 | sprintf(tmpname, "RSTPCTL_%d", getpid()); | |
56 | set_socket_address(&sa, tmpname); | |
57 | /* We need this bind. The autobind on connect isn't working properly. | |
58 | The server doesn't get a proper sockaddr in recvmsg if we don't do this. | |
59 | */ | |
60 | if (bind(s, (struct sockaddr *)&sa, sizeof(sa)) != 0) { | |
61 | ERROR("Couldn't bind socket: %m"); | |
62 | close(s); | |
63 | return -1; | |
64 | } | |
65 | ||
66 | if (connect(s, (struct sockaddr *)&sa_svr, sizeof(sa_svr)) != 0) { | |
67 | ERROR("Couldn't connect to server"); | |
68 | close(s); | |
69 | return -1; | |
70 | } | |
71 | fd = s; | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | void ctl_client_cleanup(void) | |
77 | { | |
78 | if (fd >= 0) { | |
79 | close(fd); | |
80 | fd = -1; | |
81 | } | |
82 | } | |
83 | ||
84 | int send_ctl_message(int cmd, void *inbuf, int lin, void *outbuf, int *lout, | |
85 | int *res) | |
86 | { | |
87 | struct ctl_msg_hdr mhdr; | |
88 | struct msghdr msg; | |
89 | struct iovec iov[2]; | |
90 | int l; | |
91 | ||
92 | msg.msg_name = NULL; msg.msg_namelen = 0; | |
93 | msg.msg_iov = iov; msg.msg_iovlen = 2; | |
94 | msg.msg_control = NULL; msg.msg_controllen = 0; | |
95 | ||
96 | mhdr.cmd = cmd; | |
97 | mhdr.lin = lin; | |
98 | mhdr.lout = lout != NULL ? *lout : 0; | |
99 | iov[0].iov_base = &mhdr; iov[0].iov_len = sizeof(mhdr); | |
100 | iov[1].iov_base = (void *)inbuf; iov[1].iov_len = lin; | |
101 | ||
102 | l = sendmsg(fd, &msg, 0); | |
103 | if (l < 0) { | |
104 | ERROR("Error sending message to server: %m"); | |
105 | return -1; | |
106 | } | |
107 | if (l != sizeof(mhdr) + lin) { | |
108 | ERROR("Error sending message to server: Partial write"); | |
109 | return -1; | |
110 | } | |
111 | ||
112 | iov[1].iov_base = outbuf; | |
113 | iov[1].iov_len = lout != NULL ? *lout : 0; | |
114 | ||
115 | { | |
116 | struct pollfd pfd; | |
117 | int timeout = 5000; /* 5 s */ | |
118 | int r; | |
119 | ||
120 | pfd.fd = fd; | |
121 | pfd.events = POLLIN; | |
122 | do { | |
123 | r = poll(&pfd, 1, timeout); | |
124 | if (r == 0) { | |
125 | ERROR("Error getting message from server: Timeout"); | |
126 | return -1; | |
127 | } | |
128 | if (r < 0) { | |
129 | ERROR("Error getting message from server: poll error: %m"); | |
130 | return -1; | |
131 | } | |
132 | } while ((pfd.revents & (POLLERR | POLLHUP | POLLNVAL | POLLIN)) == 0); | |
133 | ||
134 | l = recvmsg(fd, &msg, 0); | |
135 | if (l < 0) { | |
136 | ERROR("Error getting message from server: %m"); | |
137 | return -1; | |
138 | } | |
139 | if (l < sizeof(mhdr) || l != sizeof(mhdr) + mhdr.lout || mhdr.cmd != cmd) { | |
140 | ERROR("Error getting message from server: Bad format"); | |
141 | return -1; | |
142 | } | |
143 | } | |
144 | if (lout) | |
145 | *lout = mhdr.lout; | |
146 | if (res) | |
147 | *res = mhdr.res; | |
148 | ||
149 | return 0; | |
150 | } |