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+ csocket.[ch]

master
Alex 'AdUser' Z 9 years ago
parent
69f3b1b6ce
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2 changed files with 265 additions and 0 deletions
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  1. 241
      src/csocket.c
  2. 24
      src/csocket.h

241
src/csocket.c
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/* Copyright 2016 Alex 'AdUser' Z (ad_user@runbox.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include "common.h"
#include "cmsg.h"
#include "csocket.h"
#include "log.h"
int
f2b_csocket_create(const char *path) {
struct sockaddr_un addr;
int csock = -1;
int flags = -1;
assert(path != NULL);
if ((csock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
f2b_log_msg(log_error, "can't create control socket: %s", strerror(errno));
return -1;
}
memset(&addr, 0x0, sizeof(addr));
addr.sun_family = AF_UNIX;
strlcpy(addr.sun_path, path, sizeof(addr.sun_path) - 1);
if ((flags = fcntl(csock, F_GETFL, 0)) < 0)
return -1;
if (fcntl(csock, F_SETFL, flags | O_NONBLOCK) < 0) {
f2b_log_msg(log_error, "can't set non-blocking mode on socket: %s", strerror(errno));
return -1;
}
unlink(path);
if (bind(csock, (struct sockaddr *) &addr, sizeof(struct sockaddr_un)) != 0) {
f2b_log_msg(log_error, "bind() on socket failed: %s", strerror(errno));
return -1;
}
return csock;
}
void
f2b_csocket_destroy(int sock, const char *path) {
assert(path != NULL);
if (sock >= 0)
close(sock);
unlink(path);
return;
}
int
f2b_csocket_connect(const char *spath, const char *cpath) {
struct sockaddr_un caddr, saddr;
int csock = -1;
assert(spath != NULL);
assert(cpath != NULL);
memset(&saddr, 0x0, sizeof(caddr));
memset(&caddr, 0x0, sizeof(saddr));
caddr.sun_family = AF_LOCAL;
strlcpy(caddr.sun_path, cpath, sizeof(caddr.sun_path));
saddr.sun_family = AF_LOCAL;
strlcpy(saddr.sun_path, spath, sizeof(saddr.sun_path));
if ((csock = socket(AF_UNIX, SOCK_DGRAM, 0)) < 0) {
f2b_log_msg(log_error, "can't create control socket");
return -1;
}
if (bind(csock, (struct sockaddr *) &caddr, sizeof(struct sockaddr_un)) != 0) {
f2b_log_msg(log_error, "bind() to local side of socket failed: %s", strerror(errno));
return -1;
}
if (connect(csock, (struct sockaddr *) &saddr, sizeof(struct sockaddr_un)) != 0) {
f2b_log_msg(log_error, "connect() to socket failed: %s", strerror(errno));
return -1;
}
return csock;
}
void
f2b_csocket_disconnect(int sock, const char *cpath) {
unlink(cpath);
if (sock >= 0)
close(sock);
return;
}
/**
* @brief Recieve and unpack control message
* @param csock Opened socket fd
* @param cmsg Control message pointer
* @param addr Pointer for sender address store
* @param addrlen Size of address storage
* @return >0 on success, 0 on no avalilable messages, <0 on error
*/
int
f2b_csocket_recv(int csock, f2b_cmsg_t *cmsg, struct sockaddr_storage *addr, socklen_t *addrlen) {
struct msghdr msg;
uint16_t size;
int ret;
assert(csock >= 0);
assert(cmsg != NULL);
struct iovec iov[] = {
{ .iov_len = sizeof(cmsg->magic), .iov_base = &cmsg->magic[0] },
{ .iov_len = sizeof(cmsg->version), .iov_base = &cmsg->version },
{ .iov_len = sizeof(cmsg->type), .iov_base = &cmsg->type },
{ .iov_len = sizeof(cmsg->flags), .iov_base = &cmsg->flags },
{ .iov_len = sizeof(cmsg->size), .iov_base = &size /* need ntohs */ },
{ .iov_len = sizeof(cmsg->pass), .iov_base = &cmsg->pass[0] },
{ .iov_len = sizeof(cmsg->data), .iov_base = &cmsg->data[0] },
};
memset(&msg, 0x0, sizeof(msg));
msg.msg_name = addr;
msg.msg_namelen = *addrlen;
msg.msg_iov = iov;
msg.msg_iovlen = 7;
ret = recvmsg(csock, &msg, 0);
if (ret < 0 && errno == EAGAIN)
return 0; /* non-blocking mode & no messages */
if (ret < 0) {
f2b_log_msg(log_error, "recvmsg(): %s", strerror(errno));
return ret;
}
if (msg.msg_flags & MSG_TRUNC) {
f2b_log_msg(log_warn, "damaged cmsg on socket: truncated");
return -1;
}
if (memcmp(cmsg->magic, "F2B", 3) != 0) {
f2b_log_msg(log_warn, "damaged cmsg on socket: no magic");
return -1;
}
if (cmsg->version != F2B_PROTO_VER) {
f2b_log_msg(log_warn, "damaged cmsg on socket: version mismatch");
return -1;
}
if (cmsg->type >= CMD_MAX_NUMBER) {
f2b_log_msg(log_warn, "damaged cmsg on socket: unknown command type");
return -1;
}
cmsg->size = ntohs(size);
if (ret != (cmsg->size + 16)) {
f2b_log_msg(log_warn, "damaged cmsg on socket: expected %u bytes, got %u", cmsg->size + 16, ret);
return -1;
}
*addrlen = msg.msg_namelen;
return ret;
}
/**
* @brief Pack and send control message
* @param csock Opened socket fd
* @param cmsg Control message pointer
* @param addr Pointer for destination address store
* @param addrlen Size of address storage
* @return >0 on success
*/
int
f2b_csocket_send(int csock, f2b_cmsg_t *cmsg, struct sockaddr_storage *addr, socklen_t *addrlen) {
struct msghdr msg;
uint16_t size;
int ret;
assert(csock >= 0);
assert(cmsg != NULL);
struct iovec iov[] = {
{ .iov_len = sizeof(cmsg->magic), .iov_base = &cmsg->magic[0] },
{ .iov_len = sizeof(cmsg->version), .iov_base = &cmsg->version },
{ .iov_len = sizeof(cmsg->type), .iov_base = &cmsg->type },
{ .iov_len = sizeof(cmsg->flags), .iov_base = &cmsg->flags },
{ .iov_len = sizeof(cmsg->size), .iov_base = &size /* need htons */ },
{ .iov_len = sizeof(cmsg->pass), .iov_base = &cmsg->pass[0] },
{ .iov_len = cmsg->size, .iov_base = &cmsg->data[0] },
};
size = htons(cmsg->size);
memset(&msg, 0x0, sizeof(msg));
msg.msg_name = addr;
msg.msg_namelen = *addrlen;
msg.msg_iov = iov;
msg.msg_iovlen = 7;
if ((ret = sendmsg(csock, &msg, 0)) <= 0)
f2b_log_msg(log_error, "sendmsg(): %s", strerror(errno));
return ret;
}
/**
* @return -1 on error, 0 on no messages, and > 0 on some messages processed
*/
int
f2b_csocket_poll(int csock, void (*cb)(const f2b_cmsg_t *cmsg, char *res, size_t ressize)) {
char res[DATA_LEN_MAX + 1];
f2b_cmsg_t cmsg;
struct sockaddr_storage addr;
socklen_t addrlen;
int ret, processed = 0;
assert(csock >= 0);
assert(cb != NULL);
while (1) {
memset(&cmsg, 0x0, sizeof(cmsg));
memset(&addr, 0x0, sizeof(addr));
addrlen = sizeof(addr);
ret = f2b_csocket_recv(csock, &cmsg, &addr, &addrlen);
if (ret <= 0)
break; /* no messages or error */
/* TODO: check auth */
cb(&cmsg, res, sizeof(res));
if (cmsg.flags & CMSG_FLAG_NEED_REPLY) {
memset(&cmsg, 0x0, sizeof(cmsg));
strncpy(cmsg.magic, "F2B", sizeof(cmsg.magic));
strlcpy(cmsg.data, res, sizeof(cmsg.data));
cmsg.version = F2B_PROTO_VER;
cmsg.type = CMD_RESP;
cmsg.size = strlen(res);
cmsg.data[cmsg.size] = '\0';
ret = f2b_csocket_send(csock, &cmsg, &addr, &addrlen);
}
processed++;
}
return processed;
}

24
src/csocket.h
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/* Copyright 2016 Alex 'AdUser' Z (ad_user@runbox.com)
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef F2B_CSOCKET_H_
#define F2B_CSOCKET_H_
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/un.h>
int f2b_csocket_create (const char *path);
void f2b_csocket_destroy(int csock, const char *path);
int f2b_csocket_connect(const char *spath, const char *cpath);
void f2b_csocket_disconnect(int sock, const char *cpath);
int f2b_csocket_poll(int csock, void (*cb)(const f2b_cmsg_t *cmsg, char *res, size_t ressize));
int f2b_csocket_send(int csock, f2b_cmsg_t *cmsg, struct sockaddr_storage *addr, socklen_t *socklen);
int f2b_csocket_recv(int csock, f2b_cmsg_t *cmsg, struct sockaddr_storage *addr, socklen_t *socklen);
#endif /* F2B_CSOCKET_H_ */
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