#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
#include <dirent.h>
#include <sys/stat.h>
+#include <sys/wait.h>
#include "file.h"
__RPC_F_MAX,
};
-static const struct blobmsg_policy file_policy[__RPC_F_MAX] = {
+static const struct blobmsg_policy rpc_file_policy[__RPC_F_MAX] = {
[RPC_F_PATH] = { .name = "path", .type = BLOBMSG_TYPE_STRING },
[RPC_F_DATA] = { .name = "data", .type = BLOBMSG_TYPE_STRING },
};
+enum {
+ RPC_E_CMD,
+ RPC_E_PARM,
+ RPC_E_ENV,
+ RPC_E_MODE,
+ __RPC_E_MAX,
+};
+
+static const struct blobmsg_policy rpc_exec_policy[__RPC_E_MAX] = {
+ [RPC_E_CMD] = { .name = "command", .type = BLOBMSG_TYPE_STRING },
+ [RPC_E_PARM] = { .name = "params", .type = BLOBMSG_TYPE_ARRAY },
+ [RPC_E_ENV] = { .name = "env", .type = BLOBMSG_TYPE_TABLE },
+ [RPC_E_MODE] = { .name = "mode", .type = BLOBMSG_TYPE_STRING },
+};
+
static const char *d_types[] = {
[DT_BLK] = "block",
[DT_CHR] = "char",
{
static struct blob_attr *tb[__RPC_F_MAX];
- blobmsg_parse(file_policy, __RPC_F_MAX, tb, blob_data(msg), blob_len(msg));
+ blobmsg_parse(rpc_file_policy, __RPC_F_MAX, tb, blob_data(msg), blob_len(msg));
if (!tb[RPC_F_PATH])
{
}
static int
-rpc_handle_read(struct ubus_context *ctx, struct ubus_object *obj,
- struct ubus_request_data *req, const char *method,
- struct blob_attr *msg)
+rpc_file_read(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
- int fd, rlen;
+ int fd, rv, len;
char *path;
- char buffer[RPC_FILE_MAX_SIZE];
struct stat s;
+ char *wbuf;
if (!rpc_check_path(msg, &path, &s))
return rpc_errno_status();
if ((fd = open(path, O_RDONLY)) < 0)
return rpc_errno_status();
- if ((rlen = read(fd, buffer, RPC_FILE_MAX_SIZE-1)) > 0)
- buffer[rlen] = 0;
+ /* some sysfs files do not report a length */
+ if (s.st_size == 0)
+ s.st_size = RPC_FILE_MIN_SIZE;
- close(fd);
+ blob_buf_init(&buf, 0);
- if (rlen <= 0)
- return UBUS_STATUS_NO_DATA;
+ wbuf = blobmsg_alloc_string_buffer(&buf, "data", s.st_size + 1);
+
+ if (!wbuf)
+ {
+ rv = UBUS_STATUS_UNKNOWN_ERROR;
+ goto out;
+ }
+
+ if ((len = read(fd, wbuf, s.st_size)) <= 0)
+ {
+ rv = UBUS_STATUS_NO_DATA;
+ goto out;
+ }
+
+ *(wbuf + len) = 0;
+ blobmsg_add_string_buffer(&buf);
- blob_buf_init(&buf, 0);
- blobmsg_add_string(&buf, "data", buffer);
ubus_send_reply(ctx, req, buf.head);
+ rv = UBUS_STATUS_OK;
- return 0;
+out:
+ close(fd);
+ return rv;
}
static int
-rpc_handle_write(struct ubus_context *ctx, struct ubus_object *obj,
- struct ubus_request_data *req, const char *method,
- struct blob_attr *msg)
+rpc_file_write(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
- int fd, rv;
+ int fd;
char *path;
struct stat s;
struct blob_attr **tb;
if ((fd = open(path, O_WRONLY)) < 0)
return rpc_errno_status();
- rv = write(fd, blobmsg_data(tb[RPC_F_DATA]), blobmsg_data_len(tb[RPC_F_DATA]));
-
+ write(fd, blobmsg_data(tb[RPC_F_DATA]), blobmsg_data_len(tb[RPC_F_DATA]));
close(fd);
- if (rv <= 0)
- return UBUS_STATUS_NO_DATA;
-
return 0;
}
static int
-rpc_handle_list(struct ubus_context *ctx, struct ubus_object *obj,
- struct ubus_request_data *req, const char *method,
- struct blob_attr *msg)
+rpc_file_list(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
DIR *fd;
void *c, *d;
}
static int
-rpc_handle_stat(struct ubus_context *ctx, struct ubus_object *obj,
- struct ubus_request_data *req, const char *method,
- struct blob_attr *msg)
+rpc_file_stat(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
{
int type;
char *path;
type = S_ISREG(s.st_mode) ? DT_REG :
S_ISDIR(s.st_mode) ? DT_DIR :
- S_ISCHR(s.st_mode) ? DT_CHR :
- S_ISBLK(s.st_mode) ? DT_BLK :
- S_ISFIFO(s.st_mode) ? DT_FIFO :
- S_ISLNK(s.st_mode) ? DT_LNK :
- S_ISSOCK(s.st_mode) ? DT_SOCK :
- DT_UNKNOWN;
+ S_ISCHR(s.st_mode) ? DT_CHR :
+ S_ISBLK(s.st_mode) ? DT_BLK :
+ S_ISFIFO(s.st_mode) ? DT_FIFO :
+ S_ISLNK(s.st_mode) ? DT_LNK :
+ S_ISSOCK(s.st_mode) ? DT_SOCK :
+ DT_UNKNOWN;
blobmsg_add_string(&buf, "path", path);
blobmsg_add_string(&buf, "type", d_types[type]);
return 0;
}
+static const char *
+rpc_file_exec_lookup(const char *cmd)
+{
+ struct stat s;
+ int plen = 0, clen = strlen(cmd) + 1;
+ char *search, *p;
+ static char path[PATH_MAX];
+
+ if (!stat(cmd, &s) && S_ISREG(s.st_mode))
+ return cmd;
+
+ search = getenv("PATH");
+
+ if (!search)
+ search = "/bin:/usr/bin:/sbin:/usr/sbin";
+
+ p = search;
+
+ do
+ {
+ if (*p != ':' && *p != '\0')
+ continue;
+
+ plen = p - search;
+
+ if ((plen + clen) >= sizeof(path))
+ continue;
+
+ strncpy(path, search, plen);
+ sprintf(path + plen, "/%s", cmd);
+
+ if (!stat(path, &s) && S_ISREG(s.st_mode))
+ return path;
+
+ search = p + 1;
+ }
+ while (*p++);
+
+ return NULL;
+}
+
+
+static void
+rpc_ustream_to_blobmsg(struct ustream *s, const char *name)
+{
+ int len;
+ char *rbuf, *wbuf;
+
+ if ((len = ustream_pending_data(s, false)) > 0)
+ {
+ wbuf = blobmsg_alloc_string_buffer(&buf, name, len + 1);
+
+ if (!wbuf)
+ return;
+
+ ustream_for_each_read_buffer(s, rbuf, len)
+ {
+ memcpy(wbuf, rbuf, len);
+ wbuf += len;
+ }
+
+ *wbuf = 0;
+ blobmsg_add_string_buffer(&buf);
+ }
+}
+
+static void
+rpc_file_exec_reply(struct rpc_file_exec_context *c, int rv)
+{
+ uloop_timeout_cancel(&c->timeout);
+ uloop_process_delete(&c->process);
+
+ if (rv == UBUS_STATUS_OK)
+ {
+ blob_buf_init(&buf, 0);
+
+ blobmsg_add_u32(&buf, "code", WEXITSTATUS(c->stat));
+
+ rpc_ustream_to_blobmsg(&c->opipe.stream, "stdout");
+ rpc_ustream_to_blobmsg(&c->epipe.stream, "stderr");
+
+ ubus_send_reply(c->context, &c->request, buf.head);
+ }
+
+ ubus_complete_deferred_request(c->context, &c->request, rv);
+
+ ustream_free(&c->opipe.stream);
+ ustream_free(&c->epipe.stream);
+
+ close(c->opipe.fd.fd);
+ close(c->epipe.fd.fd);
+
+ free(c);
+}
+
+static void
+rpc_file_exec_timeout_cb(struct uloop_timeout *t)
+{
+ struct rpc_file_exec_context *c =
+ container_of(t, struct rpc_file_exec_context, timeout);
+
+ kill(c->process.pid, SIGKILL);
+ rpc_file_exec_reply(c, UBUS_STATUS_TIMEOUT);
+}
+
+static void
+rpc_file_exec_process_cb(struct uloop_process *p, int stat)
+{
+ struct rpc_file_exec_context *c =
+ container_of(p, struct rpc_file_exec_context, process);
+
+ c->stat = stat;
+
+ ustream_poll(&c->opipe.stream);
+ ustream_poll(&c->epipe.stream);
+}
+
+static void
+rpc_file_exec_opipe_read_cb(struct ustream *s, int bytes)
+{
+ struct rpc_file_exec_context *c =
+ container_of(s, struct rpc_file_exec_context, opipe);
+
+ if (ustream_read_buf_full(s))
+ rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
+}
+
+static void
+rpc_file_exec_epipe_read_cb(struct ustream *s, int bytes)
+{
+ struct rpc_file_exec_context *c =
+ container_of(s, struct rpc_file_exec_context, epipe);
+
+ if (ustream_read_buf_full(s))
+ rpc_file_exec_reply(c, UBUS_STATUS_NOT_SUPPORTED);
+}
+
+static void
+rpc_file_exec_opipe_state_cb(struct ustream *s)
+{
+ struct rpc_file_exec_context *c =
+ container_of(s, struct rpc_file_exec_context, opipe);
+
+ if (c->opipe.stream.eof && c->epipe.stream.eof)
+ rpc_file_exec_reply(c, UBUS_STATUS_OK);
+}
+
+static void
+rpc_file_exec_epipe_state_cb(struct ustream *s)
+{
+ struct rpc_file_exec_context *c =
+ container_of(s, struct rpc_file_exec_context, epipe);
+
+ if (c->opipe.stream.eof && c->epipe.stream.eof)
+ rpc_file_exec_reply(c, UBUS_STATUS_OK);
+}
+
+static int
+rpc_file_exec_run(const char *cmd,
+ const struct blob_attr *arg, const struct blob_attr *env,
+ struct ubus_context *ctx, struct ubus_request_data *req)
+{
+ pid_t pid;
+
+ int opipe[2];
+ int epipe[2];
+
+ int rem;
+ struct blob_attr *cur;
+
+ char arglen;
+ char **args;
+
+ struct rpc_file_exec_context *c;
+
+ cmd = rpc_file_exec_lookup(cmd);
+
+ if (!cmd)
+ return UBUS_STATUS_NOT_FOUND;
+
+ c = malloc(sizeof(*c));
+
+ if (!c)
+ return UBUS_STATUS_UNKNOWN_ERROR;
+
+ if (pipe(opipe) || pipe(epipe))
+ return rpc_errno_status();
+
+ switch ((pid = fork()))
+ {
+ case -1:
+ return rpc_errno_status();
+
+ case 0:
+ uloop_done();
+
+ dup2(opipe[1], 1);
+ dup2(epipe[1], 2);
+
+ close(0);
+ close(opipe[0]);
+ close(opipe[1]);
+ close(epipe[0]);
+ close(epipe[1]);
+
+ arglen = 2;
+ args = malloc(sizeof(char *) * arglen);
+
+ if (!args)
+ return UBUS_STATUS_UNKNOWN_ERROR;
+
+ args[0] = (char *)cmd;
+ args[1] = NULL;
+
+ if (arg)
+ {
+ blobmsg_for_each_attr(cur, arg, rem)
+ {
+ if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
+ continue;
+
+ arglen++;
+
+ if (!(args = realloc(args, sizeof(char *) * arglen)))
+ return UBUS_STATUS_UNKNOWN_ERROR;
+
+ args[arglen-2] = blobmsg_data(cur);
+ args[arglen-1] = NULL;
+ }
+ }
+
+ if (env)
+ {
+ blobmsg_for_each_attr(cur, env, rem)
+ {
+ if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING)
+ continue;
+
+ setenv(blobmsg_name(cur), blobmsg_data(cur), 1);
+ }
+ }
+
+ if (execv(cmd, args))
+ return rpc_errno_status();
+
+ default:
+ memset(c, 0, sizeof(*c));
+
+ ustream_declare(c->opipe, opipe[0], exec_opipe);
+ ustream_declare(c->epipe, epipe[0], exec_epipe);
+
+ c->process.pid = pid;
+ c->process.cb = rpc_file_exec_process_cb;
+ uloop_process_add(&c->process);
+
+ c->timeout.cb = rpc_file_exec_timeout_cb;
+ uloop_timeout_set(&c->timeout, RPC_FILE_MAX_RUNTIME);
+
+ close(opipe[1]);
+ close(epipe[1]);
+
+ c->context = ctx;
+ ubus_defer_request(ctx, req, &c->request);
+ }
+
+ return UBUS_STATUS_OK;
+}
+
+static int
+rpc_file_exec(struct ubus_context *ctx, struct ubus_object *obj,
+ struct ubus_request_data *req, const char *method,
+ struct blob_attr *msg)
+{
+ struct blob_attr *tb[__RPC_E_MAX];
+
+ blobmsg_parse(rpc_exec_policy, __RPC_E_MAX, tb,
+ blob_data(msg), blob_len(msg));
+
+ if (!tb[RPC_E_CMD])
+ return UBUS_STATUS_INVALID_ARGUMENT;
+
+ return rpc_file_exec_run(blobmsg_data(tb[RPC_E_CMD]),
+ tb[RPC_E_PARM], tb[RPC_E_ENV], ctx, req);
+}
+
int rpc_file_api_init(struct ubus_context *ctx)
{
static const struct ubus_method file_methods[] = {
- UBUS_METHOD("read", rpc_handle_read, file_policy),
- UBUS_METHOD("write", rpc_handle_write, file_policy),
- UBUS_METHOD("list", rpc_handle_list, file_policy),
- UBUS_METHOD("stat", rpc_handle_stat, file_policy),
+ UBUS_METHOD("read", rpc_file_read, rpc_file_policy),
+ UBUS_METHOD("write", rpc_file_write, rpc_file_policy),
+ UBUS_METHOD("list", rpc_file_list, rpc_file_policy),
+ UBUS_METHOD("stat", rpc_file_stat, rpc_file_policy),
+ UBUS_METHOD("exec", rpc_file_exec, rpc_exec_policy),
};
static struct ubus_object_type file_type =
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