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hw/9pfs: Add support to use named socket for proxy FS

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Add option to use named socket for communicating between proxy helper
and qemu proxy FS. Access to socket can be given by using command line
options -u and -g.

Signed-off-by: M. Mohan Kumar <mohan@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
M. Mohan Kumar 2011-12-14 13:58:47 +05:30 • committed by Aneesh Kumar K.V
parent a2d8f1beb1
commit 84a87cc4cc
7 changed files with 159 additions and 17 deletions
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56
hw/9pfs/virtio-9p-proxy.c
View file

@ -1095,15 +1095,49 @@ static int proxy_ioc_getversion(FsContext *fs_ctx, V9fsPath *path,
return err;
}
static int proxy_parse_opts(QemuOpts *opts, struct FsDriverEntry *fs)
static int connect_namedsocket(const char *path)
{
const char *sock_fd = qemu_opt_get(opts, "sock_fd");
int sockfd, size;
struct sockaddr_un helper;
if (sock_fd) {
fprintf(stderr, "sock_fd option not specified\n");
sockfd = socket(AF_UNIX, SOCK_STREAM, 0);
if (sockfd < 0) {
fprintf(stderr, "socket %s\n", strerror(errno));
return -1;
}
fs->path = g_strdup(sock_fd);
strcpy(helper.sun_path, path);
helper.sun_family = AF_UNIX;
size = strlen(helper.sun_path) + sizeof(helper.sun_family);
if (connect(sockfd, (struct sockaddr *)&helper, size) < 0) {
fprintf(stderr, "socket error\n");
return -1;
}
/* remove the socket for security reasons */
unlink(path);
return sockfd;
}
static int proxy_parse_opts(QemuOpts *opts, struct FsDriverEntry *fs)
{
const char *socket = qemu_opt_get(opts, "socket");
const char *sock_fd = qemu_opt_get(opts, "sock_fd");
if (!socket && !sock_fd) {
fprintf(stderr, "socket and sock_fd none of the option specified\n");
return -1;
}
if (socket && sock_fd) {
fprintf(stderr, "Both socket and sock_fd options specified\n");
return -1;
}
if (socket) {
fs->path = g_strdup(socket);
fs->export_flags = V9FS_PROXY_SOCK_NAME;
} else {
fs->path = g_strdup(sock_fd);
fs->export_flags = V9FS_PROXY_SOCK_FD;
}
return 0;
}
@ -1112,10 +1146,14 @@ static int proxy_init(FsContext *ctx)
V9fsProxy *proxy = g_malloc(sizeof(V9fsProxy));
int sock_id;
sock_id = atoi(ctx->fs_root);
if (sock_id < 0) {
fprintf(stderr, "socket descriptor not initialized\n");
return -1;
if (ctx->export_flags & V9FS_PROXY_SOCK_NAME) {
sock_id = connect_namedsocket(ctx->fs_root);
} else {
sock_id = atoi(ctx->fs_root);
if (sock_id < 0) {
fprintf(stderr, "socket descriptor not initialized\n");
return -1;
}
}
g_free(ctx->fs_root);