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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2020 Intel Corporation
*/
#include <unistd.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <pthread.h>
/* we won't link against libbsd, so just always use DPDKs-specific strlcpy */
#undef RTE_USE_LIBBSD
#include <rte_string_fns.h>
#include <rte_common.h>
#include <rte_spinlock.h>
#include "rte_telemetry_legacy.h"
#define MAX_LEN 128
#define BUF_SIZE 1024
#define CLIENTS_UNREG_ACTION "\"action\":2"
#define CLIENTS_CMD "\"command\":\"clients\""
#define CLIENTS_DATA "\"data\":{\"client_path\":\""
#define STATS_ACTION "\"action\":0"
#define DATA_REQ_LABEL "\"data\":"
#define TELEMETRY_LEGACY_MAX_CALLBACKS 4
static int
register_client(const char *cmd __rte_unused,
const char *params __rte_unused,
char *buffer, int buf_len);
struct json_command {
char action[MAX_LEN];
char cmd[MAX_LEN];
char data[MAX_LEN];
telemetry_legacy_cb fn;
};
struct json_command callbacks[TELEMETRY_LEGACY_MAX_CALLBACKS] = {
{
.action = "\"action\":1",
.cmd = CLIENTS_CMD,
.data = CLIENTS_DATA,
.fn = register_client
}
};
int num_legacy_callbacks = 1;
static rte_spinlock_t callback_sl = RTE_SPINLOCK_INITIALIZER;
int
rte_telemetry_legacy_register(const char *cmd,
enum rte_telemetry_legacy_data_req data_req,
telemetry_legacy_cb fn)
{
if (fn == NULL)
return -EINVAL;
if (num_legacy_callbacks >= (int) RTE_DIM(callbacks))
return -ENOENT;
rte_spinlock_lock(&callback_sl);
strlcpy(callbacks[num_legacy_callbacks].action, STATS_ACTION, MAX_LEN);
snprintf(callbacks[num_legacy_callbacks].cmd, MAX_LEN,
"\"command\":\"%s\"", cmd);
snprintf(callbacks[num_legacy_callbacks].data, MAX_LEN,
data_req ? "%s{\"" : "%snull",
DATA_REQ_LABEL);
callbacks[num_legacy_callbacks].fn = fn;
num_legacy_callbacks++;
rte_spinlock_unlock(&callback_sl);
return 0;
}
static int
register_client(const char *cmd __rte_unused, const char *params,
char *buffer __rte_unused, int buf_len __rte_unused)
{
pthread_t th;
char data[BUF_SIZE];
int fd;
struct sockaddr_un addrs;
if (!strchr(params, ':')) {
fprintf(stderr, "Invalid data\n");
return -1;
}
strlcpy(data, strchr(params, ':'), sizeof(data));
memcpy(data, &data[strlen(":\"")], strlen(data));
if (!strchr(data, '\"')) {
fprintf(stderr, "Invalid client data\n");
return -1;
}
*strchr(data, '\"') = 0;
fd = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (fd < 0) {
perror("Failed to open socket");
return -1;
}
addrs.sun_family = AF_UNIX;
strlcpy(addrs.sun_path, data, sizeof(addrs.sun_path));
if (connect(fd, (struct sockaddr *)&addrs, sizeof(addrs)) == -1) {
perror("\nClient connection error\n");
close(fd);
return -1;
}
pthread_create(&th, NULL, &legacy_client_handler,
(void *)(uintptr_t)fd);
return 0;
}
static int
send_error_response(int s, int err)
{
const char *desc;
char out_buf[100000];
switch (err) {
case -ENOMEM:
desc = "Memory Allocation Error";
break;
case -EINVAL:
desc = "Invalid Argument 404";
break;
case -EPERM:
desc = "Unknown";
break;
default:
/* Default case keeps behaviour of Telemetry library */
printf("\nInvalid error type: %d\n", err);
return -EINVAL;
}
int used = snprintf(out_buf, sizeof(out_buf), "{\"status_code\": "
"\"Status Error: %s\", \"data\": null}", desc);
if (write(s, out_buf, used) < 0) {
perror("Error writing to socket");
return -1;
}
return 0;
}
static void
perform_command(telemetry_legacy_cb fn, const char *param, int s)
{
char out_buf[100000];
int ret, used = 0;
ret = fn("", param, out_buf, sizeof(out_buf));
if (ret < 0) {
ret = send_error_response(s, ret);
if (ret < 0)
printf("\nCould not send error response\n");
return;
}
used += ret;
if (write(s, out_buf, used) < 0)
perror("Error writing to socket");
}
static int
parse_client_request(char *buffer, int buf_len, int s)
{
int i;
char *data = buffer + buf_len;
telemetry_legacy_cb fn = NULL;
const char *valid_sep = ",}";
if (buffer[0] != '{' || buffer[buf_len - 1] != '}')
return -EPERM;
if (strstr(buffer, CLIENTS_UNREG_ACTION) && strstr(buffer, CLIENTS_CMD)
&& strstr(buffer, CLIENTS_DATA))
return 0;
for (i = 0; i < num_legacy_callbacks; i++) {
char *action_ptr = strstr(buffer, callbacks[i].action);
char *cmd_ptr = strstr(buffer, callbacks[i].cmd);
char *data_ptr = strstr(buffer, callbacks[i].data);
if (!action_ptr || !cmd_ptr || !data_ptr)
continue;
char action_sep = action_ptr[strlen(callbacks[i].action)];
char cmd_sep = cmd_ptr[strlen(callbacks[i].cmd)];
if (!(strchr(valid_sep, action_sep) && strchr(valid_sep,
cmd_sep)))
return -EPERM;
char data_sep;
if (!strchr(data_ptr, '{'))
data_sep = data_ptr[strlen(callbacks[i].data)];
else {
if (!strchr(data_ptr, '}'))
return -EINVAL;
char *data_end = strchr(data_ptr, '}');
data = data_ptr + strlen(DATA_REQ_LABEL);
data_sep = data_end[1];
data_end[1] = 0;
}
if (!strchr(valid_sep, data_sep))
return -EPERM;
fn = callbacks[i].fn;
break;
}
if (!fn)
return -EINVAL;
perform_command(fn, data, s);
return 0;
}
void *
legacy_client_handler(void *sock_id)
{
int s = (int)(uintptr_t)sock_id;
int ret;
char buffer_recv[BUF_SIZE];
/* receive data is not null terminated */
int bytes = read(s, buffer_recv, sizeof(buffer_recv) - 1);
while (bytes > 0) {
buffer_recv[bytes] = 0;
int i, j;
char buffer[BUF_SIZE];
for (i = 0, j = 0; buffer_recv[i] != '\0'; i++) {
buffer[j] = buffer_recv[i];
j += !isspace(buffer_recv[i]);
}
buffer[j] = 0;
ret = parse_client_request(buffer, j, s);
if (ret < 0) {
ret = send_error_response(s, ret);
if (ret < 0)
printf("\nCould not send error response\n");
}
bytes = read(s, buffer_recv, sizeof(buffer_recv) - 1);
}
close(s);
return NULL;
}
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