/**
* collectd - src/network.c
- * Copyright (C) 2005-2008 Florian octo Forster
+ * Copyright (C) 2005-2009 Florian octo Forster
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
# include <poll.h>
#endif
+#if HAVE_GCRYPT_H
+# include <gcrypt.h>
+#endif
+
/* 1500 - 40 - 8 = Ethernet packet - IPv6 header - UDP header */
/* #define BUFF_SIZE 1452 */
# endif
#endif /* !IP_ADD_MEMBERSHIP */
+/* Buffer size to allocate. */
#define BUFF_SIZE 1024
/*
+ * Maximum size required for encryption / signing:
+ * Type/length: 4
+ * Hash/orig length: 32
+ * Padding (up to): 16
+ * --------------------
+ * 52
+ */
+#define BUFF_SIG_SIZE 52
+
+/*
* Private data types
*/
typedef struct sockent
int fd;
struct sockaddr_storage *addr;
socklen_t addrlen;
+
+#define SECURITY_LEVEL_NONE 0
+#if HAVE_GCRYPT_H
+# define SECURITY_LEVEL_SIGN 1
+# define SECURITY_LEVEL_ENCRYPT 2
+ int security_level;
+ char *shared_secret;
+ gcry_cipher_hd_t cypher;
+#endif /* HAVE_GCRYPT_H */
+
struct sockent *next;
} sockent_t;
};
typedef struct part_values_s part_values_t;
+struct part_signature_sha256_s
+{
+ part_header_t head;
+ char hash[32];
+};
+typedef struct part_signature_sha256_s part_signature_sha256_t;
+
+struct part_encryption_aes256_s
+{
+ part_header_t head;
+ uint16_t orig_length;
+ uint16_t random;
+ char hash[28];
+};
+typedef struct part_encryption_aes256_s part_encryption_aes256_t;
+
struct receive_list_entry_s
{
char data[BUFF_SIZE];
int data_len;
+ int fd;
struct receive_list_entry_s *next;
};
typedef struct receive_list_entry_s receive_list_entry_t;
/*
* Private variables
*/
-static const char *config_keys[] =
-{
- "CacheFlush",
- "Listen",
- "Server",
- "TimeToLive",
- "Forward"
-};
-static int config_keys_num = STATIC_ARRAY_SIZE (config_keys);
-
static int network_config_ttl = 0;
static int network_config_forward = 0;
static pthread_mutex_t receive_list_lock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t receive_list_cond = PTHREAD_COND_INITIALIZER;
-static struct pollfd *listen_sockets = NULL;
-static int listen_sockets_num = 0;
-
-static int listen_loop = 0;
-static pthread_t receive_thread_id = 0;
-static pthread_t dispatch_thread_id = 0;
-
-static char send_buffer[BUFF_SIZE];
-static char *send_buffer_ptr;
-static int send_buffer_fill;
-static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
-static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
-
-static c_avl_tree_t *cache_tree = NULL;
+static sockent_t *listen_sockets = NULL;
+static struct pollfd *listen_sockets_pollfd = NULL;
+static int listen_sockets_num = 0;
+
+/* The receive and dispatch threads will run as long as `listen_loop' is set to
+ * zero. */
+static int listen_loop = 0;
+static int receive_thread_running = 0;
+static pthread_t receive_thread_id;
+static int dispatch_thread_running = 0;
+static pthread_t dispatch_thread_id;
+
+/* Buffer in which to-be-sent network packets are constructed. */
+static char send_buffer[BUFF_SIZE];
+static char *send_buffer_ptr;
+static int send_buffer_fill;
+static value_list_t send_buffer_vl = VALUE_LIST_STATIC;
+static pthread_mutex_t send_buffer_lock = PTHREAD_MUTEX_INITIALIZER;
+
+/* In this cache we store all the values we received, so we can send out only
+ * those values which were *not* received via the network plugin, too. This is
+ * used for the `Forward false' option. */
+static c_avl_tree_t *cache_tree = NULL;
static pthread_mutex_t cache_lock = PTHREAD_MUTEX_INITIALIZER;
static time_t cache_flush_last = 0;
static int cache_flush_interval = 1800;
pthread_mutex_unlock (&cache_lock);
- DEBUG ("network plugin: cache_check: key = %s; time = %i; retval = %i",
- key, (int) vl->time, retval);
-
return (retval);
} /* int cache_check */
return (0);
} /* int parse_part_string */
-static int parse_packet (void *buffer, int buffer_len)
+#if HAVE_GCRYPT_H
+static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
+ void **ret_buffer, int *ret_buffer_len)
+{
+ char *buffer = *ret_buffer;
+ size_t buffer_len = (size_t) *ret_buffer_len;
+
+ part_signature_sha256_t ps_received;
+ part_signature_sha256_t ps_expected;
+
+ if (se->shared_secret == NULL)
+ {
+ NOTICE ("network plugin: Received signed network packet but can't verify "
+ "it because no shared secret has been configured. Will accept it.");
+ return (0);
+ }
+
+ if (buffer_len < sizeof (ps_received))
+ return (-ENOMEM);
+
+ memcpy (&ps_received, buffer, sizeof (ps_received));
+
+ memset (&ps_expected, 0, sizeof (ps_expected));
+ ps_expected.head.type = htons (TYPE_SIGN_SHA256);
+ ps_expected.head.length = htons (sizeof (ps_expected));
+ sstrncpy (ps_expected.hash, se->shared_secret, sizeof (ps_expected.hash));
+ memcpy (buffer, &ps_expected, sizeof (ps_expected));
+
+ gcry_md_hash_buffer (GCRY_MD_SHA256, ps_expected.hash, buffer, buffer_len);
+
+ *ret_buffer += sizeof (ps_received);
+
+ if (memcmp (ps_received.hash, ps_expected.hash,
+ sizeof (ps_received.hash)) == 0)
+ return (0);
+ else /* hashes do not match. */
+ return (1);
+} /* }}} int parse_part_sign_sha256 */
+/* #endif HAVE_GCRYPT_H */
+
+#else /* if !HAVE_GCRYPT_H */
+static int parse_part_sign_sha256 (sockent_t *se, /* {{{ */
+ void **ret_buffer, int *ret_buffer_len)
+{
+ INFO ("network plugin: Received signed packet, but the network "
+ "plugin was not linked with libgcrypt, so I cannot "
+ "verify the signature. The packet will be accepted.");
+ return (0);
+} /* }}} int parse_part_sign_sha256 */
+#endif /* !HAVE_GCRYPT_H */
+
+#if HAVE_GCRYPT_H
+static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
+ void **ret_buffer, int *ret_buffer_len)
+{
+ char *buffer = *ret_buffer;
+ int buffer_len = *ret_buffer_len;
+ int orig_buffer_len;
+ part_encryption_aes256_t pea;
+ char hash[28];
+ gcry_error_t err;
+
+ if (se->cypher == NULL)
+ {
+ NOTICE ("network plugin: Unable to decrypt packet, because no cypher "
+ "instance is present.");
+ return (-1);
+ }
+
+ /* Decrypt the packet in-place */
+ err = gcry_cipher_decrypt (se->cypher,
+ buffer + sizeof (pea.head), buffer_len - sizeof (pea.head),
+ /* in = */ NULL, /* in len = */ 0);
+ gcry_cipher_reset (se->cypher);
+ if (err != 0)
+ {
+ ERROR ("network plugin: gcry_cipher_decrypt returned: %s",
+ gcry_strerror (err));
+ return (-1);
+ }
+
+ /* Copy the header information to `pea' */
+ memcpy (&pea, buffer, sizeof (pea));
+ buffer += sizeof (pea);
+ buffer_len -= sizeof (pea);
+
+ /* Check sanity of the original length */
+ orig_buffer_len = ntohs (pea.orig_length);
+ if (orig_buffer_len > buffer_len)
+ {
+ ERROR ("network plugin: Decryption failed: Invalid original length.");
+ return (-1);
+ }
+
+ /* Check hash sum */
+ memset (hash, 0, sizeof (hash));
+ gcry_md_hash_buffer (GCRY_MD_SHA224, hash, buffer, orig_buffer_len);
+
+ if (memcmp (hash, pea.hash, sizeof (hash)) != 0)
+ {
+ ERROR ("network plugin: Decryption failed: Checksum mismatch.");
+ return (-1);
+ }
+
+ /* Update return values */
+ *ret_buffer = buffer;
+ *ret_buffer_len = orig_buffer_len;
+
+ return (0);
+} /* }}} int parse_part_encr_aes256 */
+/* #endif HAVE_GCRYPT_H */
+
+#else /* if !HAVE_GCRYPT_H */
+static int parse_part_encr_aes256 (sockent_t *se, /* {{{ */
+ void **ret_buffer, int *ret_buffer_len)
+{
+ INFO ("network plugin: Received encrypted packet, but the network "
+ "plugin was not linked with libgcrypt, so I cannot "
+ "decrypt it. The packet will be discarded.");
+ return (-1);
+} /* }}} int parse_part_encr_aes256 */
+#endif /* !HAVE_GCRYPT_H */
+
+static int parse_packet (receive_list_entry_t *rle) /* {{{ */
{
int status;
+ void *buffer;
+ int buffer_len;
+ sockent_t *se;
+
value_list_t vl = VALUE_LIST_INIT;
notification_t n;
- DEBUG ("network plugin: parse_packet: buffer = %p; buffer_len = %i;",
- buffer, buffer_len);
+ int packet_was_encrypted = 0;
+ int packet_was_signed = 0;
+#if HAVE_GCRYPT_H
+ int printed_ignore_warning = 0;
+#endif /* HAVE_GCRYPT_H */
+
+ buffer = rle->data;
+ buffer_len = rle->data_len;
+
+ /* Look for the correct `sockent_t' */
+ se = listen_sockets;
+ while ((se != NULL) && (se->fd != rle->fd))
+ se = se->next;
+
+ if (se == NULL)
+ {
+ ERROR ("network plugin: Got packet from FD %i, but can't "
+ "find an appropriate socket entry.",
+ rle->fd);
+ return (-1);
+ }
memset (&vl, '\0', sizeof (vl));
memset (&n, '\0', sizeof (n));
if (pkg_length < (2 * sizeof (uint16_t)))
break;
- if (pkg_type == TYPE_VALUES)
+ if (pkg_type == TYPE_ENCR_AES256)
+ {
+ status = parse_part_encr_aes256 (se, &buffer, &buffer_len);
+ if (status != 0)
+ {
+ ERROR ("network plugin: Decrypting AES256 "
+ "part failed "
+ "with status %i.", status);
+ break;
+ }
+ else
+ {
+ packet_was_encrypted = 1;
+ }
+ }
+#if HAVE_GCRYPT_H
+ else if ((se->security_level == SECURITY_LEVEL_ENCRYPT)
+ && (packet_was_encrypted == 0))
+ {
+ if (printed_ignore_warning == 0)
+ {
+ INFO ("network plugin: Unencrypted packet or "
+ "part has been ignored.");
+ printed_ignore_warning = 1;
+ }
+ buffer = ((char *) buffer) + pkg_length;
+ continue;
+ }
+#endif /* HAVE_GCRYPT_H */
+ else if (pkg_type == TYPE_SIGN_SHA256)
+ {
+ status = parse_part_sign_sha256 (se, &buffer, &buffer_len);
+ if (status < 0)
+ {
+ ERROR ("network plugin: Verifying SHA-256 "
+ "signature failed "
+ "with status %i.", status);
+ break;
+ }
+ else if (status > 0)
+ {
+ ERROR ("network plugin: Ignoring packet with "
+ "invalid SHA-256 signature.");
+ break;
+ }
+ else
+ {
+ packet_was_signed = 1;
+ }
+ }
+#if HAVE_GCRYPT_H
+ else if ((se->security_level == SECURITY_LEVEL_SIGN)
+ && (packet_was_encrypted == 0)
+ && (packet_was_signed == 0))
+ {
+ if (printed_ignore_warning == 0)
+ {
+ INFO ("network plugin: Unsigned packet or "
+ "part has been ignored.");
+ printed_ignore_warning = 1;
+ }
+ buffer = ((char *) buffer) + pkg_length;
+ continue;
+ }
+#endif /* HAVE_GCRYPT_H */
+ else if (pkg_type == TYPE_VALUES)
{
status = parse_part_values (&buffer, &buffer_len,
&vl.values, &vl.values_len);
} /* while (buffer_len > sizeof (part_header_t)) */
return (status);
-} /* int parse_packet */
+} /* }}} int parse_packet */
-static void free_sockent (sockent_t *se)
+static void free_sockent (sockent_t *se) /* {{{ */
{
sockent_t *next;
while (se != NULL)
{
next = se->next;
+
+#if HAVE_GCRYPT_H
+ if (se->cypher != NULL)
+ {
+ gcry_cipher_close (se->cypher);
+ se->cypher = NULL;
+ }
+ free (se->shared_secret);
+#endif /* HAVE_GCRYPT_H */
+
free (se->addr);
free (se);
+
se = next;
}
-} /* void free_sockent */
+} /* }}} void free_sockent */
/*
* int network_set_ttl
return (0);
} /* int network_set_ttl */
+#if HAVE_GCRYPT_H
+static int network_set_encryption (sockent_t *se, /* {{{ */
+ const char *shared_secret)
+{
+ char hash[32];
+ gcry_error_t err;
+
+ se->shared_secret = sstrdup (shared_secret);
+
+ /*
+ * We use CBC *without* an initialization vector: The cipher is reset after
+ * each packet and we would have to re-set the IV each time. The first
+ * encrypted block will contain the SHA-224 checksum anyway, so this should
+ * be quite unpredictable. Also, there's a 2 byte field in the header that's
+ * being filled with random numbers. So we only use CBC so the blocks
+ * *within* one packet are chained.
+ */
+ err = gcry_cipher_open (&se->cypher,
+ GCRY_CIPHER_AES256, GCRY_CIPHER_MODE_CBC, /* flags = */ 0);
+ if (err != 0)
+ {
+ ERROR ("network plugin: gcry_cipher_open returned: %s",
+ gcry_strerror (err));
+ return (-1);
+ }
+
+ assert (se->shared_secret != NULL);
+ gcry_md_hash_buffer (GCRY_MD_SHA256, hash,
+ se->shared_secret, strlen (se->shared_secret));
+
+ err = gcry_cipher_setkey (se->cypher, hash, sizeof (hash));
+ if (err != 0)
+ {
+ DEBUG ("network plugin: gcry_cipher_setkey returned: %s",
+ gcry_strerror (err));
+ gcry_cipher_close (se->cypher);
+ se->cypher = NULL;
+ return (-1);
+ }
+
+ return (0);
+} /* }}} int network_set_encryption */
+#endif /* HAVE_GCRYPT_H */
+
static int network_bind_socket (const sockent_t *se, const struct addrinfo *ai)
{
int loop = 0;
return (0);
} /* int network_bind_socket */
-static sockent_t *network_create_socket (const char *node,
+#define CREATE_SOCKET_FLAGS_LISTEN 0x0001
+static sockent_t *network_create_socket (const char *node, /* {{{ */
const char *service,
- int listen)
+ const char *shared_secret,
+ int security_level,
+ int flags)
{
struct addrinfo ai_hints;
struct addrinfo *ai_list, *ai_ptr;
for (ai_ptr = ai_list; ai_ptr != NULL; ai_ptr = ai_ptr->ai_next)
{
sockent_t *se;
+ int status;
if ((se = (sockent_t *) malloc (sizeof (sockent_t))) == NULL)
{
continue;
}
- if (listen != 0)
+ if ((flags & CREATE_SOCKET_FLAGS_LISTEN) != 0)
{
- if (network_bind_socket (se, ai_ptr) != 0)
+ status = network_bind_socket (se, ai_ptr);
+ if (status != 0)
{
close (se->fd);
free (se->addr);
continue;
}
}
- else /* listen == 0 */
+ else /* sending socket */
{
network_set_ttl (se, ai_ptr);
}
+#if HAVE_GCRYPT_H
+ se->security_level = security_level;
+ se->shared_secret = NULL;
+ se->cypher = NULL;
+ if (shared_secret != NULL)
+ {
+ status = network_set_encryption (se, shared_secret);
+ if ((status != 0) && (security_level <= SECURITY_LEVEL_SIGN))
+ {
+ WARNING ("network plugin: Starting cryptograp"
+ "hic subsystem failed. Since "
+ "security level `Sign' or "
+ "`None' is configured I will "
+ "continue.");
+ }
+ else if (status != 0)
+ {
+ ERROR ("network plugin: Starting cryptograp"
+ "hic subsystem failed. "
+ "Because the security level "
+ "is set to `Encrypt' I will "
+ "not continue!");
+ close (se->fd);
+ free (se->addr);
+ free (se);
+ continue;
+ }
+ } /* if (shared_secret != NULL) */
+#else
+ /* Make compiler happy */
+ security_level = 0;
+ shared_secret = NULL;
+#endif /* HAVE_GCRYPT_H */
+
if (se_tail == NULL)
{
se_head = se;
}
/* We don't open more than one write-socket per node/service pair.. */
- if (listen == 0)
+ if ((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0)
break;
}
freeaddrinfo (ai_list);
return (se_head);
-} /* sockent_t *network_create_socket */
+} /* }}} sockent_t *network_create_socket */
-static sockent_t *network_create_default_socket (int listen)
+static sockent_t *network_create_default_socket (int flags) /* {{{ */
{
sockent_t *se_ptr = NULL;
sockent_t *se_head = NULL;
sockent_t *se_tail = NULL;
- se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR,
- NET_DEFAULT_PORT, listen);
+ se_ptr = network_create_socket (NET_DEFAULT_V6_ADDR, NET_DEFAULT_PORT,
+ /* shared secret = */ NULL, SECURITY_LEVEL_NONE,
+ flags);
/* Don't send to the same machine in IPv6 and IPv4 if both are available. */
- if ((listen == 0) && (se_ptr != NULL))
+ if (((flags & CREATE_SOCKET_FLAGS_LISTEN) == 0) && (se_ptr != NULL))
return (se_ptr);
if (se_ptr != NULL)
se_tail = se_tail->next;
}
- se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT, listen);
+ se_ptr = network_create_socket (NET_DEFAULT_V4_ADDR, NET_DEFAULT_PORT,
+ /* shared secret = */ NULL, SECURITY_LEVEL_NONE,
+ flags);
if (se_tail == NULL)
return (se_ptr);
se_tail->next = se_ptr;
return (se_head);
-} /* sockent_t *network_create_default_socket */
+} /* }}} sockent_t *network_create_default_socket */
-static int network_add_listen_socket (const char *node, const char *service)
+static int network_add_listen_socket (const char *node, /* {{{ */
+ const char *service, const char *shared_secret, int security_level)
{
sockent_t *se;
sockent_t *se_ptr;
int se_num = 0;
+ int flags;
+
+ flags = CREATE_SOCKET_FLAGS_LISTEN;
+
if (service == NULL)
service = NET_DEFAULT_PORT;
if (node == NULL)
- se = network_create_default_socket (1 /* listen == true */);
+ se = network_create_default_socket (flags);
else
- se = network_create_socket (node, service, 1 /* listen == true */);
+ se = network_create_socket (node, service,
+ shared_secret, security_level, flags);
if (se == NULL)
return (-1);
for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
se_num++;
- listen_sockets = (struct pollfd *) realloc (listen_sockets,
+ listen_sockets_pollfd = realloc (listen_sockets_pollfd,
(listen_sockets_num + se_num)
* sizeof (struct pollfd));
for (se_ptr = se; se_ptr != NULL; se_ptr = se_ptr->next)
{
- listen_sockets[listen_sockets_num].fd = se_ptr->fd;
- listen_sockets[listen_sockets_num].events = POLLIN | POLLPRI;
- listen_sockets[listen_sockets_num].revents = 0;
+ listen_sockets_pollfd[listen_sockets_num].fd = se_ptr->fd;
+ listen_sockets_pollfd[listen_sockets_num].events = POLLIN | POLLPRI;
+ listen_sockets_pollfd[listen_sockets_num].revents = 0;
listen_sockets_num++;
} /* for (se) */
- free_sockent (se);
+ se_ptr = listen_sockets;
+ while ((se_ptr != NULL) && (se_ptr->next != NULL))
+ se_ptr = se_ptr->next;
+
+ if (se_ptr == NULL)
+ listen_sockets = se;
+ else
+ se_ptr->next = se;
+
return (0);
-} /* int network_add_listen_socket */
+} /* }}} int network_add_listen_socket */
-static int network_add_sending_socket (const char *node, const char *service)
+static int network_add_sending_socket (const char *node, /* {{{ */
+ const char *service, const char *shared_secret, int security_level)
{
sockent_t *se;
sockent_t *se_ptr;
service = NET_DEFAULT_PORT;
if (node == NULL)
- se = network_create_default_socket (0 /* listen == false */);
+ se = network_create_default_socket (/* flags = */ 0);
else
- se = network_create_socket (node, service, 0 /* listen == false */);
+ se = network_create_socket (node, service,
+ shared_secret, security_level,
+ /* flags = */ 0);
if (se == NULL)
return (-1);
se_ptr->next = se;
return (0);
-} /* int network_get_listen_socket */
+} /* }}} int network_add_sending_socket */
static void *dispatch_thread (void __attribute__((unused)) *arg)
{
if (ent == NULL)
break;
- parse_packet (ent->data, ent->data_len);
+ parse_packet (ent);
sfree (ent);
} /* while (42) */
return (NULL);
-} /* void *receive_thread */
+} /* void *dispatch_thread */
static int network_receive (void)
{
receive_list_entry_t *private_list_tail;
if (listen_sockets_num == 0)
- network_add_listen_socket (NULL, NULL);
+ network_add_listen_socket (/* node = */ NULL,
+ /* service = */ NULL,
+ /* shared secret = */ NULL,
+ /* encryption = */ 0);
if (listen_sockets_num == 0)
{
while (listen_loop == 0)
{
- status = poll (listen_sockets, listen_sockets_num, -1);
+ status = poll (listen_sockets_pollfd, listen_sockets_num, -1);
if (status <= 0)
{
{
receive_list_entry_t *ent;
- if ((listen_sockets[i].revents & (POLLIN | POLLPRI)) == 0)
+ if ((listen_sockets_pollfd[i].revents
+ & (POLLIN | POLLPRI)) == 0)
continue;
status--;
- buffer_len = recv (listen_sockets[i].fd,
+ buffer_len = recv (listen_sockets_pollfd[i].fd,
buffer, sizeof (buffer),
0 /* no flags */);
if (buffer_len < 0)
return (-1);
}
+ /* TODO: Possible performance enhancement: Do not free
+ * these entries in the dispatch thread but put them in
+ * another list, so we don't have to allocate more and
+ * more of these structures. */
ent = malloc (sizeof (receive_list_entry_t));
if (ent == NULL)
{
return (-1);
}
memset (ent, 0, sizeof (receive_list_entry_t));
+ ent->fd = listen_sockets_pollfd[i].fd;
ent->next = NULL;
/* Hopefully this be optimized out by the compiler. It
pthread_cond_signal (&receive_list_cond);
pthread_mutex_unlock (&receive_list_lock);
}
- } /* for (listen_sockets) */
+ } /* for (listen_sockets_pollfd) */
} /* while (listen_loop == 0) */
/* Make sure everything is dispatched before exiting. */
}
return (0);
-}
+} /* int network_receive */
static void *receive_thread (void __attribute__((unused)) *arg)
{
return (network_receive () ? (void *) 1 : (void *) 0);
} /* void *receive_thread */
-static void network_send_buffer (const char *buffer, int buffer_len)
+static void network_init_buffer (void)
{
- sockent_t *se;
- int status;
+ memset (send_buffer, 0, sizeof (send_buffer));
+ send_buffer_ptr = send_buffer;
+ send_buffer_fill = 0;
- DEBUG ("network plugin: network_send_buffer: buffer_len = %i", buffer_len);
+ memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
+} /* int network_init_buffer */
- for (se = sending_sockets; se != NULL; se = se->next)
+static void networt_send_buffer_plain (const sockent_t *se, /* {{{ */
+ const char *buffer, size_t buffer_size)
+{
+ int status;
+
+ while (42)
{
- while (42)
+ status = sendto (se->fd, buffer, buffer_size, 0 /* no flags */,
+ (struct sockaddr *) se->addr, se->addrlen);
+ if (status < 0)
{
- status = sendto (se->fd, buffer, buffer_len, 0 /* no flags */,
- (struct sockaddr *) se->addr, se->addrlen);
- if (status < 0)
- {
- char errbuf[1024];
- if (errno == EINTR)
- continue;
- ERROR ("network plugin: sendto failed: %s",
- sstrerror (errno, errbuf,
- sizeof (errbuf)));
- break;
- }
-
+ char errbuf[1024];
+ if (errno == EINTR)
+ continue;
+ ERROR ("network plugin: sendto failed: %s",
+ sstrerror (errno, errbuf,
+ sizeof (errbuf)));
break;
- } /* while (42) */
- } /* for (sending_sockets) */
-} /* void network_send_buffer */
+ }
+
+ break;
+ } /* while (42) */
+} /* }}} void networt_send_buffer_plain */
+
+#if HAVE_GCRYPT_H
+static void networt_send_buffer_signed (const sockent_t *se, /* {{{ */
+ const char *in_buffer, size_t in_buffer_size)
+{
+ part_signature_sha256_t ps;
+ char buffer[sizeof (ps) + in_buffer_size];
+ char hash[sizeof (ps.hash)];
+
+ /* Initialize the `ps' structure. */
+ memset (&ps, 0, sizeof (ps));
+ ps.head.type = htons (TYPE_SIGN_SHA256);
+ ps.head.length = htons ((uint16_t) sizeof (ps));
+ sstrncpy (ps.hash, se->shared_secret, sizeof (ps.hash));
+
+ /* Prepend the signature. */
+ memcpy (buffer, &ps, sizeof (ps));
+ memcpy (buffer + sizeof (ps), in_buffer, in_buffer_size);
+
+ /* Calculate the hash value. */
+ gcry_md_hash_buffer (GCRY_MD_SHA256, hash, buffer, sizeof (buffer));
+
+ /* Copy the hash value into the buffer. */
+ memcpy (ps.hash, hash, sizeof (ps.hash));
+ memcpy (buffer, &ps, sizeof (ps));
+
+ networt_send_buffer_plain (se, buffer, sizeof (buffer));
+} /* }}} void networt_send_buffer_signed */
+
+static void networt_send_buffer_encrypted (const sockent_t *se, /* {{{ */
+ const char *in_buffer, size_t in_buffer_size)
+{
+ part_encryption_aes256_t pea;
+ char buffer[sizeof (pea) + in_buffer_size + 16];
+ size_t buffer_size;
+ gcry_error_t err;
+
+ /* Round to the next multiple of 16, because AES has a block size of 128 bit.
+ * the first four bytes of `pea' are not encrypted and must be subtracted. */
+ buffer_size = (sizeof (pea) + in_buffer_size + 15 - sizeof (pea.head)) / 16;
+ buffer_size = buffer_size * 16;
+ buffer_size += sizeof (pea.head);
+
+ DEBUG ("network plugin: networt_send_buffer_encrypted: "
+ "buffer_size = %zu;", buffer_size);
+
+ /* Initialize the header fields */
+ memset (&pea, 0, sizeof (pea));
+ pea.head.type = htons (TYPE_ENCR_AES256);
+ pea.head.length = htons ((uint16_t) buffer_size);
+ pea.orig_length = htons ((uint16_t) in_buffer_size);
+
+ /* Fill the extra field with random values. Some entropy in the encrypted
+ * data is usually not a bad thing, I hope. */
+ gcry_randomize (&pea.random, sizeof (pea.random), GCRY_STRONG_RANDOM);
+
+ /* Create hash of the payload */
+ gcry_md_hash_buffer (GCRY_MD_SHA224, pea.hash, in_buffer, in_buffer_size);
+
+ /* Initialize the buffer */
+ memset (buffer, 0, sizeof (buffer));
+ memcpy (buffer, &pea, sizeof (pea));
+ memcpy (buffer + sizeof (pea), in_buffer, in_buffer_size);
+
+ /* Encrypt the buffer in-place */
+ err = gcry_cipher_encrypt (se->cypher,
+ buffer + sizeof (pea.head), buffer_size - sizeof (pea.head),
+ /* in = */ NULL, /* in len = */ 0);
+ gcry_cipher_reset (se->cypher);
+ if (err != 0)
+ {
+ ERROR ("network plugin: gcry_cipher_encrypt returned: %s",
+ gcry_strerror (err));
+ return;
+ }
+
+ /* Send it out without further modifications */
+ networt_send_buffer_plain (se, buffer, buffer_size);
+} /* }}} void networt_send_buffer_encrypted */
+#endif /* HAVE_GCRYPT_H */
+
+static void network_send_buffer (char *buffer, size_t buffer_len) /* {{{ */
+{
+ sockent_t *se;
-static int add_to_buffer (char *buffer, int buffer_size,
+ DEBUG ("network plugin: network_send_buffer: buffer_len = %zu", buffer_len);
+
+ for (se = sending_sockets; se != NULL; se = se->next)
+ {
+#if HAVE_GCRYPT_H
+ if (se->security_level == SECURITY_LEVEL_ENCRYPT)
+ networt_send_buffer_encrypted (se, buffer, buffer_len);
+ else if (se->security_level == SECURITY_LEVEL_SIGN)
+ networt_send_buffer_signed (se, buffer, buffer_len);
+ else /* if (se->security_level == SECURITY_LEVEL_NONE) */
+#endif /* HAVE_GCRYPT_H */
+ networt_send_buffer_plain (se, buffer, buffer_len);
+ } /* for (sending_sockets) */
+} /* }}} void network_send_buffer */
+
+static int add_to_buffer (char *buffer, int buffer_size, /* {{{ */
value_list_t *vl_def,
const data_set_t *ds, const value_list_t *vl)
{
return (-1);
return (buffer - buffer_orig);
-} /* int add_to_buffer */
+} /* }}} int add_to_buffer */
static void flush_buffer (void)
{
DEBUG ("network plugin: flush_buffer: send_buffer_fill = %i",
send_buffer_fill);
- network_send_buffer (send_buffer, send_buffer_fill);
- send_buffer_ptr = send_buffer;
- send_buffer_fill = 0;
- memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
+ network_send_buffer (send_buffer, (size_t) send_buffer_fill);
+ network_init_buffer ();
}
-static int network_write (const data_set_t *ds, const value_list_t *vl)
+static int network_write (const data_set_t *ds, const value_list_t *vl,
+ user_data_t __attribute__((unused)) *user_data)
{
int status;
pthread_mutex_lock (&send_buffer_lock);
status = add_to_buffer (send_buffer_ptr,
- sizeof (send_buffer) - send_buffer_fill,
+ sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
&send_buffer_vl,
ds, vl);
if (status >= 0)
flush_buffer ();
status = add_to_buffer (send_buffer_ptr,
- sizeof (send_buffer) - send_buffer_fill,
+ sizeof (send_buffer) - (send_buffer_fill + BUFF_SIG_SIZE),
&send_buffer_vl,
ds, vl);
return ((status < 0) ? -1 : 0);
} /* int network_write */
-static int network_config (const char *key, const char *val)
+static int network_config_set_boolean (const oconfig_item_t *ci, /* {{{ */
+ int *retval)
{
- char *node;
- char *service;
+ if ((ci->values_num != 1)
+ || ((ci->values[0].type != OCONFIG_TYPE_BOOLEAN)
+ && (ci->values[0].type != OCONFIG_TYPE_STRING)))
+ {
+ ERROR ("network plugin: The `%s' config option needs "
+ "exactly one boolean argument.", ci->key);
+ return (-1);
+ }
- char *fields[3];
- int fields_num;
+ if (ci->values[0].type == OCONFIG_TYPE_BOOLEAN)
+ {
+ if (ci->values[0].value.boolean)
+ *retval = 1;
+ else
+ *retval = 0;
+ }
+ else
+ {
+ char *str = ci->values[0].value.string;
+
+ if ((strcasecmp ("true", str) == 0)
+ || (strcasecmp ("yes", str) == 0)
+ || (strcasecmp ("on", str) == 0))
+ *retval = 1;
+ else if ((strcasecmp ("false", str) == 0)
+ || (strcasecmp ("no", str) == 0)
+ || (strcasecmp ("off", str) == 0))
+ *retval = 0;
+ else
+ {
+ ERROR ("network plugin: Cannot parse string value `%s' of the `%s' "
+ "option as boolean value.",
+ str, ci->key);
+ return (-1);
+ }
+ }
- if ((strcasecmp ("Listen", key) == 0)
- || (strcasecmp ("Server", key) == 0))
- {
- char *val_cpy = strdup (val);
- if (val_cpy == NULL)
- return (1);
+ return (0);
+} /* }}} int network_config_set_boolean */
- service = NET_DEFAULT_PORT;
- fields_num = strsplit (val_cpy, fields, 3);
- if ((fields_num != 1)
- && (fields_num != 2))
- {
- sfree (val_cpy);
- return (1);
- }
- else if (fields_num == 2)
- {
- if ((service = strchr (fields[1], '.')) != NULL)
- *service = '\0';
- service = fields[1];
- }
- node = fields[0];
+static int network_config_set_ttl (const oconfig_item_t *ci) /* {{{ */
+{
+ int tmp;
+ if ((ci->values_num != 1)
+ || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
+ {
+ WARNING ("network plugin: The `TimeToLive' config option needs exactly "
+ "one numeric argument.");
+ return (-1);
+ }
- if (strcasecmp ("Listen", key) == 0)
- network_add_listen_socket (node, service);
- else
- network_add_sending_socket (node, service);
+ tmp = (int) ci->values[0].value.number;
+ if ((tmp > 0) && (tmp <= 255))
+ network_config_ttl = tmp;
- sfree (val_cpy);
- }
- else if (strcasecmp ("TimeToLive", key) == 0)
- {
- int tmp = atoi (val);
- if ((tmp > 0) && (tmp < 256))
- network_config_ttl = tmp;
- else
- return (1);
- }
- else if (strcasecmp ("Forward", key) == 0)
- {
- if ((strcasecmp ("true", val) == 0)
- || (strcasecmp ("yes", val) == 0)
- || (strcasecmp ("on", val) == 0))
- network_config_forward = 1;
- else
- network_config_forward = 0;
- }
- else if (strcasecmp ("CacheFlush", key) == 0)
- {
- int tmp = atoi (val);
- if (tmp > 0)
- cache_flush_interval = tmp;
- else return (1);
- }
- else
- {
- return (-1);
- }
- return (0);
-} /* int network_config */
+ return (0);
+} /* }}} int network_config_set_ttl */
+
+#if HAVE_GCRYPT_H
+static int network_config_set_security_level (oconfig_item_t *ci, /* {{{ */
+ int *retval)
+{
+ char *str;
+ if ((ci->values_num != 1)
+ || (ci->values[0].type != OCONFIG_TYPE_STRING))
+ {
+ WARNING ("network plugin: The `SecurityLevel' config option needs exactly "
+ "one string argument.");
+ return (-1);
+ }
+
+ str = ci->values[0].value.string;
+ if (strcasecmp ("Encrypt", str) == 0)
+ *retval = SECURITY_LEVEL_ENCRYPT;
+ else if (strcasecmp ("Sign", str) == 0)
+ *retval = SECURITY_LEVEL_SIGN;
+ else if (strcasecmp ("None", str) == 0)
+ *retval = SECURITY_LEVEL_NONE;
+ else
+ {
+ WARNING ("network plugin: Unknown security level: %s.", str);
+ return (-1);
+ }
+
+ return (0);
+} /* }}} int network_config_set_security_level */
+#endif /* HAVE_GCRYPT_H */
+
+static int network_config_listen_server (const oconfig_item_t *ci) /* {{{ */
+{
+ char *node;
+ char *service;
+ char *shared_secret = NULL;
+ int security_level = SECURITY_LEVEL_NONE;
+ int i;
+
+ if ((ci->values_num < 1) || (ci->values_num > 2)
+ || (ci->values[0].type != OCONFIG_TYPE_STRING)
+ || ((ci->values_num > 1) && (ci->values[1].type != OCONFIG_TYPE_STRING)))
+ {
+ ERROR ("network plugin: The `%s' config option needs "
+ "one or two string arguments.", ci->key);
+ return (-1);
+ }
+
+ node = ci->values[0].value.string;
+ if (ci->values_num >= 2)
+ service = ci->values[1].value.string;
+ else
+ service = NULL;
+
+ for (i = 0; i < ci->children_num; i++)
+ {
+ oconfig_item_t *child = ci->children + i;
+
+#if HAVE_GCRYPT_H
+ if (strcasecmp ("Secret", child->key) == 0)
+ {
+ if ((child->values_num == 1)
+ && (child->values[0].type == OCONFIG_TYPE_STRING))
+ shared_secret = child->values[0].value.string;
+ else
+ ERROR ("network plugin: The `Secret' option needs exactly one string "
+ "argument.");
+ }
+ else if (strcasecmp ("SecurityLevel", child->key) == 0)
+ network_config_set_security_level (child, &security_level);
+ else
+#endif /* HAVE_GCRYPT_H */
+ {
+ WARNING ("network plugin: Option `%s' is not allowed here.",
+ child->key);
+ }
+ }
+
+ if ((security_level > SECURITY_LEVEL_NONE) && (shared_secret == NULL))
+ {
+ ERROR ("network plugin: A security level higher than `none' was "
+ "requested, but no shared key was given. Cowardly refusing to open "
+ "this socket!");
+ return (-1);
+ }
+
+ if (strcasecmp ("Listen", ci->key) == 0)
+ network_add_listen_socket (node, service, shared_secret, security_level);
+ else
+ network_add_sending_socket (node, service, shared_secret, security_level);
+
+ return (0);
+} /* }}} int network_config_listen_server */
+
+static int network_config_set_cache_flush (const oconfig_item_t *ci) /* {{{ */
+{
+ int tmp;
+ if ((ci->values_num != 1)
+ || (ci->values[0].type != OCONFIG_TYPE_NUMBER))
+ {
+ WARNING ("network plugin: The `CacheFlush' config option needs exactly "
+ "one numeric argument.");
+ return (-1);
+ }
-static int network_notification (const notification_t *n)
+ tmp = (int) ci->values[0].value.number;
+ if (tmp > 0)
+ network_config_ttl = tmp;
+
+ return (0);
+} /* }}} int network_config_set_cache_flush */
+
+static int network_config (oconfig_item_t *ci) /* {{{ */
+{
+ int i;
+
+ for (i = 0; i < ci->children_num; i++)
+ {
+ oconfig_item_t *child = ci->children + i;
+
+ if ((strcasecmp ("Listen", child->key) == 0)
+ || (strcasecmp ("Server", child->key) == 0))
+ network_config_listen_server (child);
+ else if (strcasecmp ("TimeToLive", child->key) == 0)
+ network_config_set_ttl (child);
+ else if (strcasecmp ("Forward", child->key) == 0)
+ network_config_set_boolean (child, &network_config_forward);
+ else if (strcasecmp ("CacheFlush", child->key) == 0)
+ network_config_set_cache_flush (child);
+ else
+ {
+ WARNING ("network plugin: Option `%s' is not allowed here.",
+ child->key);
+ }
+ }
+
+ return (0);
+} /* }}} int network_config */
+
+static int network_notification (const notification_t *n,
+ user_data_t __attribute__((unused)) *user_data)
{
char buffer[BUFF_SIZE];
char *buffer_ptr = buffer;
listen_loop++;
/* Kill the listening thread */
- if (receive_thread_id != (pthread_t) 0)
+ if (receive_thread_running != 0)
{
+ INFO ("network plugin: Stopping receive thread.");
pthread_kill (receive_thread_id, SIGTERM);
pthread_join (receive_thread_id, NULL /* no return value */);
- receive_thread_id = (pthread_t) 0;
+ memset (&receive_thread_id, 0, sizeof (receive_thread_id));
+ receive_thread_running = 0;
}
/* Shutdown the dispatching thread */
- if (dispatch_thread_id != (pthread_t) 0)
+ if (dispatch_thread_running != 0)
+ {
+ INFO ("network plugin: Stopping dispatch thread.");
+ pthread_mutex_lock (&receive_list_lock);
pthread_cond_broadcast (&receive_list_cond);
+ pthread_mutex_unlock (&receive_list_lock);
+ pthread_join (dispatch_thread_id, /* ret = */ NULL);
+ dispatch_thread_running = 0;
+ }
+
+ free_sockent (listen_sockets);
if (send_buffer_fill > 0)
flush_buffer ();
plugin_register_shutdown ("network", network_shutdown);
- send_buffer_ptr = send_buffer;
- send_buffer_fill = 0;
- memset (&send_buffer_vl, 0, sizeof (send_buffer_vl));
+ network_init_buffer ();
cache_tree = c_avl_create ((int (*) (const void *, const void *)) strcmp);
cache_flush_last = time (NULL);
/* setup socket(s) and so on */
if (sending_sockets != NULL)
{
- plugin_register_write ("network", network_write);
- plugin_register_notification ("network", network_notification);
+ plugin_register_write ("network", network_write,
+ /* user_data = */ NULL);
+ plugin_register_notification ("network", network_notification,
+ /* user_data = */ NULL);
}
- if ((listen_sockets_num != 0) && (receive_thread_id == 0))
+ /* If no threads need to be started, return here. */
+ if ((listen_sockets_num == 0)
+ || ((dispatch_thread_running != 0)
+ && (receive_thread_running != 0)))
+ return (0);
+
+ if (dispatch_thread_running == 0)
{
int status;
-
status = pthread_create (&dispatch_thread_id,
NULL /* no attributes */,
dispatch_thread,
sstrerror (errno, errbuf,
sizeof (errbuf)));
}
+ else
+ {
+ dispatch_thread_running = 1;
+ }
+ }
+ if (receive_thread_running == 0)
+ {
+ int status;
status = pthread_create (&receive_thread_id,
NULL /* no attributes */,
receive_thread,
sstrerror (errno, errbuf,
sizeof (errbuf)));
}
+ else
+ {
+ receive_thread_running = 1;
+ }
}
+
return (0);
} /* int network_init */
* there, good. If not, well, then there is nothing to flush.. -octo
*/
static int network_flush (int timeout,
- const char __attribute__((unused)) *identifier)
+ const char __attribute__((unused)) *identifier,
+ user_data_t __attribute__((unused)) *user_data)
{
pthread_mutex_lock (&send_buffer_lock);
void module_register (void)
{
- plugin_register_config ("network", network_config,
- config_keys, config_keys_num);
+ plugin_register_complex_config ("network", network_config);
plugin_register_init ("network", network_init);
- plugin_register_flush ("network", network_flush);
+ plugin_register_flush ("network", network_flush,
+ /* user_data = */ NULL);
} /* void module_register */
+
+/* vim: set fdm=marker : */
projects / collectd.git / blobdiff