2 * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file net.c Networking-related helper functions. */
10 * Since glibc 2.8, the _GNU_SOURCE feature test macro must be defined in order
11 * to obtain the definition of the ucred structure.
17 /* At least NetBSD needs these. */
25 #define AI_ADDRCONFIG 0
38 /** Information about one encrypted connection. */
40 /** Function used to decrypt received data. */
42 /** Function used to encrypt data to be sent. */
45 * Context-dependent data (crypt keys), passed verbatim to the above
50 /** Array holding per fd crypt data. */
51 static struct crypt_data
*crypt_data_array
;
52 /** Current size of the crypt data array. */
53 static unsigned cda_size
= 0;
56 * Activate encryption for one file descriptor.
58 * \param fd The file descriptor.
59 * \param recv_f The function used for decrypting received data.
60 * \param send_f The function used for encrypting before sending.
61 * \param private_data User data supplied by the caller.
63 void enable_crypt(int fd
, crypt_function
*recv_f
, crypt_function
*send_f
,
66 if (fd
+ 1 > cda_size
) {
67 crypt_data_array
= para_realloc(crypt_data_array
,
68 (fd
+ 1) * sizeof(struct crypt_data
));
69 memset(crypt_data_array
+ cda_size
, 0,
70 (fd
+ 1 - cda_size
) * sizeof(struct crypt_data
));
73 crypt_data_array
[fd
].recv
= recv_f
;
74 crypt_data_array
[fd
].send
= send_f
;
75 crypt_data_array
[fd
].private_data
= private_data
;
76 PARA_INFO_LOG("rc4 encryption activated for fd %d\n", fd
);
80 * Deactivate encryption for a given fd.
82 * \param fd The file descriptor.
84 * This must be called if and only if \p fd was activated via enable_crypt().
86 void disable_crypt(int fd
)
88 if (cda_size
< fd
+ 1)
90 crypt_data_array
[fd
].recv
= NULL
;
91 crypt_data_array
[fd
].send
= NULL
;
92 crypt_data_array
[fd
].private_data
= NULL
;
96 * Parse and validate IPv4 address/netmask string.
98 * \param cidr Address in CIDR notation
99 * \param addr Copy of the IPv4 address part of \a cidr
100 * \param addrlen Size of \a addr in bytes
101 * \param netmask Value of the netmask part in \a cidr or the
102 * default of 32 if not specified.
104 * \return Pointer to \a addr if succesful, NULL on error.
107 char *parse_cidr(const char *cidr
,
108 char *addr
, ssize_t addrlen
,
111 const char *o
= cidr
;
112 char *c
= addr
, *end
= c
+ (addrlen
- 1);
116 if (cidr
== NULL
|| addrlen
< 1)
119 for (o
= cidr
; (*c
= *o
== '/'? '\0' : *o
); c
++, o
++)
124 if (para_atoi32(++o
, netmask
) < 0 ||
125 *netmask
< 0 || *netmask
> 0x20)
128 if (is_valid_ipv4_address(addr
))
137 * Match string as a candidate IPv4 address.
139 * \param address The string to match.
140 * \return True if \a address has "dot-quad" format.
142 static bool is_v4_dot_quad(const char *address
)
147 assert(!regcomp(&r
, "^([0-9]+\\.){3}[0-9]+$", REG_EXTENDED
|REG_NOSUB
));
148 result
= regexec(&r
, address
, 0, NULL
, 0) == 0;
154 * Perform basic syntax checking on the host-part of an URL:
156 * - Since ':' is invalid in IPv4 addresses and DNS names, the
157 * presence of ':' causes interpretation as IPv6 address;
158 * - next the first-match-wins algorithm from RFC 3986 is applied;
159 * - else the string is considered as DNS name, to be resolved later.
161 * \param host The host string to check.
162 * \return True if \a host passes the syntax checks.
164 * \sa RFC 3986, 3.2.2; RFC 1123, 2.1; RFC 1034, 3.5
166 static bool host_string_ok(const char *host
)
168 if (host
== NULL
|| *host
== '\0')
170 if (strchr(host
, ':') != NULL
)
171 return is_valid_ipv6_address(host
);
172 if (is_v4_dot_quad(host
))
173 return is_valid_ipv4_address(host
);
178 * Parse and validate URL string.
180 * The URL syntax is loosely based on RFC 3986, supporting one of
181 * - "["host"]"[:port] for native IPv6 addresses and
182 * - host[:port] for IPv4 hostnames and DNS names.
184 * Native IPv6 addresses must be enclosed in square brackets, since
185 * otherwise there is an ambiguity with the port separator `:'.
186 * The 'port' part is always considered to be a number; if absent,
187 * it is set to -1, to indicate that a default port is to be used.
189 * The following are valid examples:
197 * \param url The URL string to take apart.
198 * \param host To return the copied host part of \a url.
199 * \param hostlen The maximum length of \a host.
200 * \param port To return the port number (if any) of \a url.
202 * \return Pointer to \a host, or NULL if failed.
203 * If NULL is returned, \a host and \a portnum are undefined. If no
204 * port number was present in \a url, \a portnum is set to -1.
206 * \sa RFC 3986, 3.2.2/3.2.3
208 char *parse_url(const char *url
,
209 char *host
, ssize_t hostlen
,
213 char *c
= host
, *end
= c
+ (hostlen
- 1);
217 if (o
== NULL
|| hostlen
< 1)
221 for (++o
; (*c
= *o
== ']' ? '\0' : *o
); c
++, o
++)
225 if (*o
++ != ']' || (*o
!= '\0' && *o
!= ':'))
228 for (; (*c
= *o
== ':'? '\0' : *o
); c
++, o
++)
234 if (para_atoi32(++o
, port
) < 0 ||
235 *port
< 0 || *port
> 0xffff)
238 if (host_string_ok(host
))
246 * Determine the socket type for a given layer-4 protocol.
248 * \param l4type The symbolic name of the transport-layer protocol.
250 * \sa ip(7), socket(2)
252 static inline int sock_type(const unsigned l4type
)
255 case IPPROTO_UDP
: return SOCK_DGRAM
;
256 case IPPROTO_TCP
: return SOCK_STREAM
;
257 case IPPROTO_DCCP
: return SOCK_DCCP
;
259 return -1; /* not supported here */
263 * Pretty-print transport-layer name.
265 static const char *layer4_name(const unsigned l4type
)
268 case IPPROTO_UDP
: return "UDP";
269 case IPPROTO_TCP
: return "TCP";
270 case IPPROTO_DCCP
: return "DCCP";
272 return "UNKNOWN PROTOCOL";
276 * Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
278 * \param l3type The layer-3 type (\p AF_INET, \p AF_INET6, \p AF_UNSPEC).
279 * \param l4type The layer-4 type (\p IPPROTO_xxx).
280 * \param passive Whether this is a passive (1) or active (0) socket.
281 * \param host Remote or local hostname or IPv/6 address string.
282 * \param port_number Decimal port number.
284 * This creates a ready-made IPv4/v6 socket structure after looking up the
285 * necessary parameters. The interpretation of \a host depends on the value of
287 * - on a passive socket host is interpreted as an interface IPv4/6 address
288 * (can be left NULL);
289 * - on an active socket, \a host is the peer DNS name or IPv4/6 address
291 * - \a port_number is in either case the numeric port number (not service
294 * Furthermore, bind(2) is called on passive sockets, and connect(2) on active
295 * sockets. The algorithm tries all possible address combinations until it
298 * \return This function returns 1 on success and \a -E_ADDRESS_LOOKUP when no
299 * matching connection could be set up (with details in the error log).
301 * \sa ipv6(7), getaddrinfo(3), bind(2), connect(2).
303 int makesock(unsigned l3type
, unsigned l4type
, int passive
,
304 const char *host
, unsigned short port_number
)
306 struct addrinfo
*local
= NULL
, *src
,
307 *remote
= NULL
, *dst
, hints
;
308 int rc
, on
= 1, sockfd
= -1,
309 socktype
= sock_type(l4type
);
310 char port
[6]; /* port number has at most 5 digits */
312 sprintf(port
, "%u", port_number
);
313 /* Set up address hint structure */
314 memset(&hints
, 0, sizeof(hints
));
315 hints
.ai_family
= l3type
;
316 hints
.ai_socktype
= socktype
;
318 * getaddrinfo does not support SOCK_DCCP, so for the sake of lookup
319 * (and only then) pretend to be UDP.
321 if (l4type
== IPPROTO_DCCP
)
322 hints
.ai_socktype
= SOCK_DGRAM
;
324 /* only use addresses available on the host */
325 hints
.ai_flags
= AI_ADDRCONFIG
;
326 if (l3type
== AF_INET6
)
327 /* use v4-mapped-v6 if no v6 addresses found */
328 hints
.ai_flags
|= AI_V4MAPPED
| AI_ALL
;
330 if (passive
&& host
== NULL
)
331 hints
.ai_flags
|= AI_PASSIVE
;
333 /* Obtain local/remote address information */
334 if ((rc
= getaddrinfo(host
, port
, &hints
, passive
? &local
: &remote
))) {
335 PARA_ERROR_LOG("can not resolve %s address %s#%s: %s.\n",
337 host
? host
: (passive
? "[loopback]" : "[localhost]"),
338 port
, gai_strerror(rc
));
339 return -E_ADDRESS_LOOKUP
;
342 /* Iterate over all src/dst combination, exhausting dst first */
343 for (src
= local
, dst
= remote
; src
!= NULL
|| dst
!= NULL
; /* no op */ ) {
344 if (src
&& dst
&& src
->ai_family
== AF_INET
345 && dst
->ai_family
== AF_INET6
)
346 goto get_next_dst
; /* v4 -> v6 is not possible */
348 sockfd
= socket(src
? src
->ai_family
: dst
->ai_family
,
354 * Set those options that need to be set before establishing
355 * the connection. Reuse the address on passive (listening)
356 * sockets to avoid failure on restart.
358 if (passive
&& setsockopt(sockfd
, SOL_SOCKET
, SO_REUSEADDR
,
359 &on
, sizeof(on
)) == -1) {
360 PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
362 return -ERRNO_TO_PARA_ERROR(errno
);
366 if (bind(sockfd
, src
->ai_addr
, src
->ai_addrlen
) < 0) {
370 if (!dst
) /* bind-only completed successfully */
374 if (dst
&& connect(sockfd
, dst
->ai_addr
, dst
->ai_addrlen
) == 0)
375 break; /* connection completed successfully */
378 if (dst
&& (dst
= dst
->ai_next
))
381 if (src
&& (src
= src
->ai_next
)) /* restart inner loop */
387 freeaddrinfo(remote
);
389 if (src
== NULL
&& dst
== NULL
) {
390 PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
391 layer4_name(l4type
), host
? host
: (passive
?
392 "[loopback]" : "[localhost]"), port
);
393 return -ERRNO_TO_PARA_ERROR(errno
);
399 * Create a passive / listening socket.
401 * \param l3type The network-layer type (\p AF_xxx).
402 * \param l4type The transport-layer type (\p IPPROTO_xxx).
403 * \param port The decimal port number to listen on.
405 * \return Positive integer (socket descriptor) on success, negative value
408 * \sa makesock(), ip(7), ipv6(7), bind(2), listen(2).
410 int para_listen(unsigned l3type
, unsigned l4type
, unsigned short port
)
412 int ret
, fd
= makesock(l3type
, l4type
, 1, NULL
, port
);
415 ret
= listen(fd
, BACKLOG
);
418 return -ERRNO_TO_PARA_ERROR(errno
);
420 PARA_INFO_LOG("listening on %s port %u, fd %d\n",
421 layer4_name(l4type
), port
, fd
);
427 * Print numeric host and port number (beware - uses static char).
429 * \param sa The IPv4/IPv6 socket address to use.
430 * \param len The length of \p sa.
432 * \sa getnameinfo(3).
434 static char *host_and_port(struct sockaddr
*sa
, socklen_t len
)
436 static char output
[NI_MAXHOST
+ NI_MAXSERV
+ 2];
437 char hbuf
[NI_MAXHOST
], sbuf
[NI_MAXSERV
];
440 ret
= getnameinfo(sa
, len
, hbuf
, sizeof(hbuf
), sbuf
, sizeof(sbuf
),
441 NI_NUMERICHOST
| NI_NUMERICSERV
);
443 PARA_WARNING_LOG("hostname lookup error (%s).\n",
445 sprintf(output
, "(unknown)");
447 sprintf(output
, "%s#%s", hbuf
, sbuf
);
452 * Look up the local or remote side of a connected socket structure.
454 * \param fd The socket descriptor of the connected socket.
455 * \param getname Either \p getsockname() for local, or \p getpeername() for
458 * \return A static character string identifying hostname and port of the
461 * \sa getsockname(2), getpeername(2).
463 static char *__get_sock_name(int fd
, int (*getname
)(int, struct sockaddr
*,
466 struct sockaddr_storage ss
;
467 socklen_t sslen
= sizeof(ss
);
469 if (getname(fd
, (struct sockaddr
*)&ss
, &sslen
) < 0) {
470 static char *dont_know
= "(don't know)";
471 PARA_ERROR_LOG("can not determine address from fd %d: %s\n",
472 fd
, strerror(errno
));
475 return host_and_port((struct sockaddr
*)&ss
, sslen
);
479 * Look up the local side of a connected socket structure.
481 * \param sockfd The file descriptor of the socket.
483 * \return A pointer to a static buffer containing hostname an port. This
484 * buffer must not be freed by the caller.
488 char *local_name(int sockfd
)
490 return __get_sock_name(sockfd
, getsockname
);
494 * Look up the remote side of a connected socket structure.
496 * \param sockfd The file descriptor of the socket.
498 * \return Analogous to the return value of \ref local_name() but for the
503 char *remote_name(int sockfd
)
505 return __get_sock_name(sockfd
, getpeername
);
509 * Extract IPv4 or IPv6-mapped-IPv4 address from sockaddr_storage.
510 * \param ss Container of IPv4/6 address
511 * \return Extracted IPv4 address (different from 0) or 0 if unsuccessful.
515 struct in_addr
extract_v4_addr(const struct sockaddr_storage
*ss
)
517 struct in_addr ia
= {.s_addr
= 0};
519 if (ss
->ss_family
== AF_INET
)
520 ia
.s_addr
= ((struct sockaddr_in
*)ss
)->sin_addr
.s_addr
;
521 if (ss
->ss_family
== AF_INET6
) {
522 const struct in6_addr v6_addr
= ((struct sockaddr_in6
*)ss
)->sin6_addr
;
524 if (IN6_IS_ADDR_V4MAPPED(&v6_addr
))
525 memcpy(&ia
.s_addr
, &(v6_addr
.s6_addr
[12]), 4);
531 * Encrypt and send a binary buffer.
533 * \param fd The file descriptor.
534 * \param buf The buffer to be encrypted and sent.
535 * \param len The length of \a buf.
537 * Check if encryption is available. If yes, encrypt the given buffer. Send
538 * out the buffer, encrypted or not, and try to resend the remaining part in
539 * case of short writes.
543 int send_bin_buffer(int fd
, const char *buf
, size_t len
)
546 crypt_function
*cf
= NULL
;
549 PARA_CRIT_LOG("len == 0\n");
550 if (fd
+ 1 <= cda_size
)
551 cf
= crypt_data_array
[fd
].send
;
553 void *private = crypt_data_array
[fd
].private_data
;
554 /* RC4 may write more than len to the output buffer */
555 unsigned char *outbuf
= para_malloc(ROUND_UP(len
, 8));
556 (*cf
)(len
, (unsigned char *)buf
, outbuf
, private);
557 ret
= write_all(fd
, (char *)outbuf
, &len
);
560 ret
= write_all(fd
, buf
, &len
);
565 * Encrypt and send null terminated buffer.
567 * \param fd The file descriptor.
568 * \param buf The null-terminated buffer to be send.
570 * This is equivalent to send_bin_buffer(fd, buf, strlen(buf)).
574 int send_buffer(int fd
, const char *buf
)
576 return send_bin_buffer(fd
, buf
, strlen(buf
));
581 * Send and encrypt a buffer given by a format string.
583 * \param fd The file descriptor.
584 * \param fmt A format string.
588 __printf_2_3
int send_va_buffer(int fd
, const char *fmt
, ...)
593 PARA_VSPRINTF(fmt
, msg
);
594 ret
= send_buffer(fd
, msg
);
600 * Receive and decrypt.
602 * \param fd The file descriptor.
603 * \param buf The buffer to write the decrypted data to.
604 * \param size The size of \a buf.
606 * Receive at most \a size bytes from file descriptor \a fd. If encryption is
607 * available, decrypt the received buffer.
609 * \return The number of bytes received on success, negative on errors.
613 __must_check
int recv_bin_buffer(int fd
, char *buf
, size_t size
)
616 crypt_function
*cf
= NULL
;
618 if (fd
+ 1 <= cda_size
)
619 cf
= crypt_data_array
[fd
].recv
;
621 unsigned char *tmp
= para_malloc(size
);
622 void *private = crypt_data_array
[fd
].private_data
;
623 n
= recv(fd
, tmp
, size
, 0);
626 unsigned char *b
= (unsigned char *)buf
;
627 (*cf
)(numbytes
, tmp
, b
, private);
631 n
= recv(fd
, buf
, size
, 0);
633 return -ERRNO_TO_PARA_ERROR(errno
);
638 * Receive, decrypt and write terminating NULL byte.
640 * \param fd The file descriptor.
641 * \param buf The buffer to write the decrypted data to.
642 * \param size The size of \a buf.
644 * Read and decrypt at most \a size - 1 bytes from file descriptor \a fd and
645 * write a NULL byte at the end of the received data.
647 * \return The return value of the underlying call to \a recv_bin_buffer().
649 * \sa recv_bin_buffer()
651 int recv_buffer(int fd
, char *buf
, size_t size
)
656 n
= recv_bin_buffer(fd
, buf
, size
- 1);
665 * Wrapper around the accept system call.
667 * \param fd The listening socket.
668 * \param addr Structure which is filled in with the address of the peer socket.
669 * \param size Should contain the size of the structure pointed to by \a addr.
671 * Accept incoming connections on \a addr. Retry if interrupted.
673 * \return The new file descriptor on success, negative on errors.
677 int para_accept(int fd
, void *addr
, socklen_t size
)
682 new_fd
= accept(fd
, (struct sockaddr
*) addr
, &size
);
683 while (new_fd
< 0 && errno
== EINTR
);
684 return new_fd
< 0? -ERRNO_TO_PARA_ERROR(errno
) : new_fd
;
688 * Prepare a structure for \p AF_UNIX socket addresses.
690 * \param u Pointer to the struct to be prepared.
691 * \param name The socket pathname.
693 * This just copies \a name to the sun_path component of \a u.
695 * \return Positive on success, \p -E_NAME_TOO_LONG if \a name is longer
696 * than \p UNIX_PATH_MAX.
698 static int init_unix_addr(struct sockaddr_un
*u
, const char *name
)
700 if (strlen(name
) >= UNIX_PATH_MAX
)
701 return -E_NAME_TOO_LONG
;
702 memset(u
->sun_path
, 0, UNIX_PATH_MAX
);
703 u
->sun_family
= PF_UNIX
;
704 strcpy(u
->sun_path
, name
);
709 * Prepare, create, and bind a socket for local communication.
711 * \param name The socket pathname.
712 * \param unix_addr Pointer to the \p AF_UNIX socket structure.
713 * \param mode The desired mode of the socket.
715 * This function creates a local socket for sequenced, reliable,
716 * two-way, connection-based byte streams.
718 * \return The file descriptor, on success, negative on errors.
724 int create_local_socket(const char *name
, struct sockaddr_un
*unix_addr
,
729 ret
= init_unix_addr(unix_addr
, name
);
732 ret
= socket(PF_UNIX
, SOCK_STREAM
, 0);
734 return -ERRNO_TO_PARA_ERROR(errno
);
736 ret
= bind(fd
, (struct sockaddr
*) unix_addr
, UNIX_PATH_MAX
);
738 ret
= -ERRNO_TO_PARA_ERROR(errno
);
742 if (chmod(name
, mode
) < 0)
751 * Prepare, create, and connect to a Unix domain socket for local communication.
753 * \param name The socket pathname.
755 * This function creates a local socket for sequenced, reliable, two-way,
756 * connection-based byte streams.
758 * \return The file descriptor, on success, negative on errors.
760 * \sa create_local_socket(), unix(7), connect(2).
762 int create_remote_socket(const char *name
)
764 struct sockaddr_un unix_addr
;
767 ret
= init_unix_addr(&unix_addr
, name
);
770 fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
772 return -ERRNO_TO_PARA_ERROR(errno
);
773 if (connect(fd
, (struct sockaddr
*)&unix_addr
, sizeof(unix_addr
)) == -1) {
774 ret
= -ERRNO_TO_PARA_ERROR(errno
);
784 ssize_t
send_cred_buffer(int sock
, char *buf
)
786 return send_buffer(sock
, buf
);
788 int recv_cred_buffer(int fd
, char *buf
, size_t size
)
790 return recv_buffer(fd
, buf
, size
) > 0? 1 : -E_RECVMSG
;
792 #else /* HAVE_UCRED */
794 * Send \p NULL-terminated buffer and Unix credentials of the current process.
796 * \param sock The socket file descriptor.
797 * \param buf The buffer to be sent.
799 * \return On success, this call returns the number of characters sent. On
800 * error, \p -E_SENDMSG is returned.
802 * \sa sendmsg(2), okir's Black Hats Manual.
804 ssize_t
send_cred_buffer(int sock
, char *buf
)
806 char control
[sizeof(struct cmsghdr
) + sizeof(struct ucred
)];
808 struct cmsghdr
*cmsg
;
809 static struct iovec iov
;
815 iov
.iov_len
= strlen(buf
);
819 /* compose the message */
820 memset(&msg
, 0, sizeof(msg
));
823 msg
.msg_control
= control
;
824 msg
.msg_controllen
= sizeof(control
);
825 /* attach the ucred struct */
826 cmsg
= CMSG_FIRSTHDR(&msg
);
827 cmsg
->cmsg_level
= SOL_SOCKET
;
828 cmsg
->cmsg_type
= SCM_CREDENTIALS
;
829 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct ucred
));
830 *(struct ucred
*)CMSG_DATA(cmsg
) = c
;
831 msg
.msg_controllen
= cmsg
->cmsg_len
;
832 ret
= sendmsg(sock
, &msg
, 0);
838 static void dispose_fds(int *fds
, unsigned num
)
842 for (i
= 0; i
< num
; i
++)
847 * Receive a buffer and the Unix credentials of the sending process.
849 * \param fd the socket file descriptor.
850 * \param buf the buffer to store the message.
851 * \param size the size of \a buffer.
853 * \return negative on errors, the user id on success.
855 * \sa recvmsg(2), okir's Black Hats Manual.
857 int recv_cred_buffer(int fd
, char *buf
, size_t size
)
861 struct cmsghdr
*cmsg
;
867 setsockopt(fd
, SOL_SOCKET
, SO_PASSCRED
, &yes
, sizeof(int));
868 memset(&msg
, 0, sizeof(msg
));
869 memset(buf
, 0, size
);
874 msg
.msg_control
= control
;
875 msg
.msg_controllen
= sizeof(control
);
876 if (recvmsg(fd
, &msg
, 0) < 0)
878 result
= -E_SCM_CREDENTIALS
;
879 cmsg
= CMSG_FIRSTHDR(&msg
);
881 if (cmsg
->cmsg_level
== SOL_SOCKET
&& cmsg
->cmsg_type
882 == SCM_CREDENTIALS
) {
883 memcpy(&cred
, CMSG_DATA(cmsg
), sizeof(struct ucred
));
886 if (cmsg
->cmsg_level
== SOL_SOCKET
887 && cmsg
->cmsg_type
== SCM_RIGHTS
) {
888 dispose_fds((int *) CMSG_DATA(cmsg
),
889 (cmsg
->cmsg_len
- CMSG_LEN(0))
892 cmsg
= CMSG_NXTHDR(&msg
, cmsg
);
896 #endif /* HAVE_UCRED */
899 * Receive a buffer and check for a pattern.
901 * \param fd The file descriptor to receive from.
902 * \param pattern The expected pattern.
903 * \param bufsize The size of the internal buffer.
905 * \return Positive if \a pattern was received, negative otherwise.
907 * This function tries to receive at most \a bufsize bytes from file descriptor
908 * \a fd. If at least \p strlen(\a pattern) bytes were received, the beginning
909 * of the received buffer is compared with \a pattern, ignoring case.
911 * \sa recv_buffer(), \sa strncasecmp(3).
913 int recv_pattern(int fd
, const char *pattern
, size_t bufsize
)
915 size_t len
= strlen(pattern
);
916 char *buf
= para_malloc(bufsize
+ 1);
917 int ret
= -E_RECV_PATTERN
, n
= recv_buffer(fd
, buf
, bufsize
+ 1);
921 if (strncasecmp(buf
, pattern
, len
))
926 PARA_NOTICE_LOG("n = %d, did not receive pattern '%s'\n", n
,
929 PARA_NOTICE_LOG("recvd: %s\n", buf
);