aboutsummaryrefslogtreecommitdiff
path: root/migration-tcp.c
blob: e8bc76acc6aa12dd39b7f83d7c23e4110b68e7a1 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
/*
 * QEMU live migration
 *
 * Copyright IBM, Corp. 2008
 *
 * Authors:
 *  Anthony Liguori   <aliguori@us.ibm.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 * Contributions after 2012-01-13 are licensed under the terms of the
 * GNU GPL, version 2 or (at your option) any later version.
 */

#include "qemu-common.h"
#include "qemu_socket.h"
#include "migration.h"
#include "qemu-char.h"
#include "buffered_file.h"
#include "block.h"

//#define DEBUG_MIGRATION_TCP

#ifdef DEBUG_MIGRATION_TCP
#define DPRINTF(fmt, ...) \
    do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
    do { } while (0)
#endif

static int socket_errno(MigrationState *s)
{
    return socket_error();
}

static int socket_write(MigrationState *s, const void * buf, size_t size)
{
    return send(s->fd, buf, size, 0);
}

static int tcp_close(MigrationState *s)
{
    int r = 0;
    DPRINTF("tcp_close\n");
    if (s->fd != -1) {
        if (close(s->fd) < 0) {
            r = -errno;
        }
        s->fd = -1;
    }
    return r;
}

static void tcp_wait_for_connect(int fd, void *opaque)
{
    MigrationState *s = opaque;

    if (fd < 0) {
        DPRINTF("migrate connect error\n");
        s->fd = -1;
        migrate_fd_error(s);
    } else {
        DPRINTF("migrate connect success\n");
        s->fd = fd;
        migrate_fd_connect(s);
    }
}

int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
                                 Error **errp)
{
    Error *local_err = NULL;

    s->get_error = socket_errno;
    s->write = socket_write;
    s->close = tcp_close;

    s->fd = inet_nonblocking_connect(host_port, tcp_wait_for_connect, s, &local_err);
    if (local_err != NULL) {
        error_propagate(errp, local_err);
        return -1;
    }

    return 0;
}

static void tcp_accept_incoming_migration(void *opaque)
{
    struct sockaddr_in addr;
    socklen_t addrlen = sizeof(addr);
    int s = (intptr_t)opaque;
    QEMUFile *f;
    int c;

    do {
        c = qemu_accept(s, (struct sockaddr *)&addr, &addrlen);
    } while (c == -1 && socket_error() == EINTR);

    DPRINTF("accepted migration\n");

    if (c == -1) {
        fprintf(stderr, "could not accept migration connection\n");
        goto out2;
    }

    f = qemu_fopen_socket(c);
    if (f == NULL) {
        fprintf(stderr, "could not qemu_fopen socket\n");
        goto out;
    }

    process_incoming_migration(f);
    qemu_fclose(f);
out:
    close(c);
out2:
    qemu_set_fd_handler2(s, NULL, NULL, NULL, NULL);
    close(s);
}

int tcp_start_incoming_migration(const char *host_port, Error **errp)
{
    int s;

    s = inet_listen(host_port, NULL, 256, SOCK_STREAM, 0, errp);

    if (s < 0) {
        return -1;
    }

    qemu_set_fd_handler2(s, NULL, tcp_accept_incoming_migration, NULL,
                         (void *)(intptr_t)s);

    return 0;
}