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isasladm.c
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isasladm.c
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/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
#include "config.h"
#include <memcached/protocol_binary.h>
#include <getopt.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
static void retry_send(int sock, const void* buf, size_t len);
static void retry_recv(int sock, void *buf, size_t len);
/**
* Try to connect to the server
* @param host the name of the server
* @param port the port to connect to
* @return a socket descriptor connected to host:port for success, -1 otherwise
*/
static int connect_server(const char *hostname, const char *port)
{
struct addrinfo *ainfo = NULL;
struct addrinfo hints = {
.ai_flags = AI_ALL,
.ai_family = PF_UNSPEC,
.ai_socktype = SOCK_STREAM,
.ai_protocol = IPPROTO_TCP};
if (getaddrinfo(hostname, port, &hints, &ainfo) != 0) {
return -1;
}
int sock = -1;
struct addrinfo *ai = ainfo;
while (ai != NULL) {
sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock != -1) {
if (connect(sock, ai->ai_addr, ai->ai_addrlen) != -1) {
break;
}
close(sock);
sock = -1;
}
ai = ai->ai_next;
}
freeaddrinfo(ainfo);
if (sock == -1) {
fprintf(stderr, "Failed to connect to memcached server (%s:%s): %s\n",
hostname, port, strerror(errno));
}
return sock;
}
/**
* Send the chunk of data to the other side, retry if an error occurs
* (or terminate the program if retry wouldn't help us)
* @param sock socket to write data to
* @param buf buffer to send
* @param len length of data to send
*/
static void retry_send(int sock, const void* buf, size_t len)
{
off_t offset = 0;
const char* ptr = buf;
do {
size_t num_bytes = len - offset;
ssize_t nw = send(sock, ptr + offset, num_bytes, 0);
if (nw == -1) {
if (errno != EINTR) {
fprintf(stderr, "Failed to write: %s\n", strerror(errno));
close(sock);
exit(1);
}
} else {
offset += nw;
}
} while (offset < len);
}
/**
* Receive a fixed number of bytes from the socket.
* (Terminate the program if we encounter a hard error...)
* @param sock socket to receive data from
* @param buf buffer to store data to
* @param len length of data to receive
*/
static void retry_recv(int sock, void *buf, size_t len)
{
if (len == 0) {
return;
}
off_t offset = 0;
do {
ssize_t nr = recv(sock, ((char*)buf) + offset, len - offset, 0);
if (nr == -1) {
if (errno != EINTR) {
fprintf(stderr, "Failed to read: %s\n", strerror(errno));
close(sock);
exit(1);
}
} else {
if (nr == 0) {
fprintf(stderr, "Connection closed\n");
close(sock);
exit(1);
}
offset += nr;
}
} while (offset < len);
}
/**
* Refresh the iSASL password database
* @param sock socket connected to the server
*/
static void refresh(int sock)
{
protocol_binary_request_no_extras request = {
.message.header.request = {
.magic = PROTOCOL_BINARY_REQ,
.opcode = PROTOCOL_BINARY_CMD_ISASL_REFRESH
}
};
retry_send(sock, &request, sizeof(request));
protocol_binary_response_no_extras response;
retry_recv(sock, &response, sizeof(response.bytes));
if (response.message.header.response.status != 0) {
uint16_t err = ntohs(response.message.header.response.status);
fprintf(stderr, "Failed to refresh isasl passwd db: %d\n",
err);
}
}
/**
* Program entry point.
*
* @param argc argument count
* @param argv argument vector
* @return 0 if success, error code otherwise
*/
int main(int argc, char **argv)
{
int cmd;
const char * const default_ports[] = { "memcache", "11211", NULL };
const char *port = NULL;
const char *host = NULL;
char *ptr;
/* Initialize the socket subsystem */
initialize_sockets();
while ((cmd = getopt(argc, argv, "h:p:u:P:")) != EOF) {
switch (cmd) {
case 'h' :
host = optarg;
ptr = strchr(optarg, ':');
if (ptr != NULL) {
*ptr = '\0';
port = ptr + 1;
}
break;
case 'p':
port = optarg;
break;
default:
fprintf(stderr,
"Usage mcstat [-h host[:port]] [-p port] [cmd]*\n");
return 1;
}
}
if (host == NULL) {
host = "localhost";
}
if (optind == argc) {
fprintf(stderr, "You need to supply a command\n");
return EXIT_FAILURE;
}
int sock = -1;
if (port == NULL) {
int ii = 0;
do {
port = default_ports[ii++];
sock = connect_server(host, port);
} while (sock == -1 && default_ports[ii] != NULL);
} else {
sock = connect_server(host, port);
}
if (sock == -1) {
return 1;
}
for (int ii = optind; ii < argc; ++ii) {
if (strcmp(argv[ii], "refresh") == 0) {
refresh(sock);
} else {
fprintf(stderr, "Unknown command %s\n", argv[ii]);
close(sock);
return 1;
}
}
close(sock);
return 0;
}