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
30 #include <openssl/rc4.h>
40 * Parse and validate IPv4 address/netmask string.
42 * \param cidr Address in CIDR notation
43 * \param addr Copy of the IPv4 address part of \a cidr
44 * \param addrlen Size of \a addr in bytes
45 * \param netmask Value of the netmask part in \a cidr or the
46 * default of 32 if not specified.
48 * \return Pointer to \a addr if succesful, NULL on error.
51 char *parse_cidr(const char *cidr
,
52 char *addr
, ssize_t addrlen
,
56 char *c
= addr
, *end
= c
+ (addrlen
- 1);
60 if (cidr
== NULL
|| addrlen
< 1)
63 for (o
= cidr
; (*c
= *o
== '/'? '\0' : *o
); c
++, o
++)
68 if (para_atoi32(++o
, netmask
) < 0 ||
69 *netmask
< 0 || *netmask
> 0x20)
72 if (is_valid_ipv4_address(addr
))
81 * Match string as a candidate IPv4 address.
83 * \param address The string to match.
84 * \return True if \a address has "dot-quad" format.
86 static bool is_v4_dot_quad(const char *address
)
91 assert(para_regcomp(&r
, "^([0-9]+\\.){3}[0-9]+$",
92 REG_EXTENDED
| REG_NOSUB
) >= 0);
93 result
= regexec(&r
, address
, 0, NULL
, 0) == 0;
99 * Perform basic syntax checking on the host-part of an URL:
101 * - Since ':' is invalid in IPv4 addresses and DNS names, the
102 * presence of ':' causes interpretation as IPv6 address;
103 * - next the first-match-wins algorithm from RFC 3986 is applied;
104 * - else the string is considered as DNS name, to be resolved later.
106 * \param host The host string to check.
107 * \return True if \a host passes the syntax checks.
109 * \sa RFC 3986, 3.2.2; RFC 1123, 2.1; RFC 1034, 3.5
111 static bool host_string_ok(const char *host
)
113 if (host
== NULL
|| *host
== '\0')
115 if (strchr(host
, ':') != NULL
)
116 return is_valid_ipv6_address(host
);
117 if (is_v4_dot_quad(host
))
118 return is_valid_ipv4_address(host
);
123 * Parse and validate URL string.
125 * The URL syntax is loosely based on RFC 3986, supporting one of
126 * - "["host"]"[:port] for native IPv6 addresses and
127 * - host[:port] for IPv4 hostnames and DNS names.
129 * Native IPv6 addresses must be enclosed in square brackets, since
130 * otherwise there is an ambiguity with the port separator `:'.
131 * The 'port' part is always considered to be a number; if absent,
132 * it is set to -1, to indicate that a default port is to be used.
134 * The following are valid examples:
142 * \param url The URL string to take apart.
143 * \param host To return the copied host part of \a url.
144 * \param hostlen The maximum length of \a host.
145 * \param port To return the port number (if any) of \a url.
147 * \return Pointer to \a host, or NULL if failed.
148 * If NULL is returned, \a host and \a portnum are undefined. If no
149 * port number was present in \a url, \a portnum is set to -1.
151 * \sa RFC 3986, 3.2.2/3.2.3
153 char *parse_url(const char *url
,
154 char *host
, ssize_t hostlen
,
158 char *c
= host
, *end
= c
+ (hostlen
- 1);
162 if (o
== NULL
|| hostlen
< 1)
166 for (++o
; (*c
= *o
== ']' ? '\0' : *o
); c
++, o
++)
170 if (*o
++ != ']' || (*o
!= '\0' && *o
!= ':'))
173 for (; (*c
= *o
== ':'? '\0' : *o
); c
++, o
++)
179 if (para_atoi32(++o
, port
) < 0 ||
180 *port
< 0 || *port
> 0xffff)
183 if (host_string_ok(host
))
191 * Stringify port number, resolve into service name where defined.
192 * \param port 2-byte port number, in host-byte-order.
193 * \param transport Transport protocol name (e.g. "udp", "tcp"), or NULL.
194 * \return Pointer to static result buffer.
196 * \sa getservent(3), services(5), nsswitch.conf(5)
198 const char *stringify_port(int port
, const char *transport
)
200 static char service
[NI_MAXSERV
];
202 if (port
< 0 || port
> 0xFFFF) {
203 snprintf(service
, sizeof(service
), "undefined (%d)", port
);
205 struct servent
*se
= getservbyport(htons(port
), transport
);
208 snprintf(service
, sizeof(service
), "%u", port
);
210 snprintf(service
, sizeof(service
), "%s", se
->s_name
);
216 * Determine the socket type for a given layer-4 protocol.
218 * \param l4type The symbolic name of the transport-layer protocol.
220 * \sa ip(7), socket(2)
222 static inline int sock_type(const unsigned l4type
)
225 case IPPROTO_UDP
: return SOCK_DGRAM
;
226 case IPPROTO_TCP
: return SOCK_STREAM
;
227 case IPPROTO_DCCP
: return SOCK_DCCP
;
229 return -1; /* not supported here */
233 * Pretty-print transport-layer name.
235 static const char *layer4_name(const unsigned l4type
)
238 case IPPROTO_UDP
: return "UDP";
239 case IPPROTO_TCP
: return "TCP";
240 case IPPROTO_DCCP
: return "DCCP";
242 return "UNKNOWN PROTOCOL";
246 * Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
248 * \param l3type The layer-3 type (\p AF_INET, \p AF_INET6, \p AF_UNSPEC).
249 * \param l4type The layer-4 type (\p IPPROTO_xxx).
250 * \param passive Whether this is a passive (1) or active (0) socket.
251 * \param host Remote or local hostname or IPv/6 address string.
252 * \param port_number Decimal port number.
254 * This creates a ready-made IPv4/v6 socket structure after looking up the
255 * necessary parameters. The interpretation of \a host depends on the value of
257 * - on a passive socket host is interpreted as an interface IPv4/6 address
258 * (can be left NULL);
259 * - on an active socket, \a host is the peer DNS name or IPv4/6 address
261 * - \a port_number is in either case the numeric port number (not service
264 * Furthermore, bind(2) is called on passive sockets, and connect(2) on active
265 * sockets. The algorithm tries all possible address combinations until it
268 * \return This function returns 1 on success and \a -E_ADDRESS_LOOKUP when no
269 * matching connection could be set up (with details in the error log).
271 * \sa ipv6(7), getaddrinfo(3), bind(2), connect(2).
273 int makesock(unsigned l3type
, unsigned l4type
, int passive
,
274 const char *host
, unsigned short port_number
)
276 struct addrinfo
*local
= NULL
, *src
,
277 *remote
= NULL
, *dst
, hints
;
278 int rc
, on
= 1, sockfd
= -1,
279 socktype
= sock_type(l4type
);
280 char port
[6]; /* port number has at most 5 digits */
282 sprintf(port
, "%u", port_number
);
283 /* Set up address hint structure */
284 memset(&hints
, 0, sizeof(hints
));
285 hints
.ai_family
= l3type
;
286 hints
.ai_socktype
= socktype
;
288 * getaddrinfo does not support SOCK_DCCP, so for the sake of lookup
289 * (and only then) pretend to be UDP.
291 if (l4type
== IPPROTO_DCCP
)
292 hints
.ai_socktype
= SOCK_DGRAM
;
294 /* only use addresses available on the host */
295 hints
.ai_flags
= AI_ADDRCONFIG
;
296 if (l3type
== AF_INET6
)
297 /* use v4-mapped-v6 if no v6 addresses found */
298 hints
.ai_flags
|= AI_V4MAPPED
| AI_ALL
;
300 if (passive
&& host
== NULL
)
301 hints
.ai_flags
|= AI_PASSIVE
;
303 /* Obtain local/remote address information */
304 if ((rc
= getaddrinfo(host
, port
, &hints
, passive
? &local
: &remote
))) {
305 PARA_ERROR_LOG("can not resolve %s address %s#%s: %s.\n",
307 host
? host
: (passive
? "[loopback]" : "[localhost]"),
308 port
, gai_strerror(rc
));
309 return -E_ADDRESS_LOOKUP
;
312 /* Iterate over all src/dst combination, exhausting dst first */
313 for (src
= local
, dst
= remote
; src
!= NULL
|| dst
!= NULL
; /* no op */ ) {
314 if (src
&& dst
&& src
->ai_family
== AF_INET
315 && dst
->ai_family
== AF_INET6
)
316 goto get_next_dst
; /* v4 -> v6 is not possible */
318 sockfd
= socket(src
? src
->ai_family
: dst
->ai_family
,
324 * Set those options that need to be set before establishing
325 * the connection. Reuse the address on passive (listening)
326 * sockets to avoid failure on restart.
328 if (passive
&& setsockopt(sockfd
, SOL_SOCKET
, SO_REUSEADDR
,
329 &on
, sizeof(on
)) == -1) {
330 PARA_ERROR_LOG("can not set SO_REUSEADDR: %s\n",
332 return -ERRNO_TO_PARA_ERROR(errno
);
336 if (bind(sockfd
, src
->ai_addr
, src
->ai_addrlen
) < 0) {
340 if (!dst
) /* bind-only completed successfully */
344 if (dst
&& connect(sockfd
, dst
->ai_addr
, dst
->ai_addrlen
) == 0)
345 break; /* connection completed successfully */
348 if (dst
&& (dst
= dst
->ai_next
))
351 if (src
&& (src
= src
->ai_next
)) /* restart inner loop */
357 freeaddrinfo(remote
);
359 if (src
== NULL
&& dst
== NULL
) {
360 PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
361 layer4_name(l4type
), host
? host
: (passive
?
362 "[loopback]" : "[localhost]"), port
);
363 return -ERRNO_TO_PARA_ERROR(errno
);
369 * Create a passive / listening socket.
371 * \param l3type The network-layer type (\p AF_xxx).
372 * \param l4type The transport-layer type (\p IPPROTO_xxx).
373 * \param port The decimal port number to listen on.
375 * \return Positive integer (socket descriptor) on success, negative value
378 * \sa makesock(), ip(7), ipv6(7), bind(2), listen(2).
380 int para_listen(unsigned l3type
, unsigned l4type
, unsigned short port
)
382 int ret
, fd
= makesock(l3type
, l4type
, 1, NULL
, port
);
385 ret
= listen(fd
, BACKLOG
);
388 return -ERRNO_TO_PARA_ERROR(errno
);
390 PARA_INFO_LOG("listening on %s port %u, fd %d\n",
391 layer4_name(l4type
), port
, fd
);
397 * Determine IPv4/v6 socket address length.
398 * \param sa Container of IPv4 or IPv6 address.
399 * \return Address-family dependent address length.
401 static socklen_t
salen(const struct sockaddr
*sa
)
403 assert(sa
->sa_family
== AF_INET
|| sa
->sa_family
== AF_INET6
);
405 return sa
->sa_family
== AF_INET6
406 ? sizeof(struct sockaddr_in6
)
407 : sizeof(struct sockaddr_in
);
411 * Process IPv4/v6 address, turn v6-mapped-v4 address into normal IPv4 address.
412 * \param ss Container of IPv4/6 address.
413 * \return Pointer to normalized address (may be static storage).
417 static const struct sockaddr
*
418 normalize_ip_address(const struct sockaddr_storage
*ss
)
420 const struct sockaddr_in6
*ia6
= (const struct sockaddr_in6
*)ss
;
422 assert(ss
->ss_family
== AF_INET
|| ss
->ss_family
== AF_INET6
);
424 if (ss
->ss_family
== AF_INET6
&& IN6_IS_ADDR_V4MAPPED(&ia6
->sin6_addr
)) {
425 static struct sockaddr_in ia
;
427 ia
.sin_family
= AF_INET
;
428 ia
.sin_port
= ia6
->sin6_port
;
429 memcpy(&ia
.sin_addr
.s_addr
, &(ia6
->sin6_addr
.s6_addr
[12]), 4);
430 return (const struct sockaddr
*)&ia
;
432 return (const struct sockaddr
*)ss
;
436 * Print numeric host and port number (beware - uses static char).
438 * \param sa The IPv4/IPv6 socket address to use.
440 * \sa getnameinfo(3), services(5), nsswitch.conf(5)
442 static char *host_and_port(const struct sockaddr_storage
*ss
)
444 const struct sockaddr
*sa
= normalize_ip_address(ss
);
445 char hbuf
[NI_MAXHOST
], sbuf
[NI_MAXSERV
];
446 static char output
[sizeof(hbuf
) + sizeof(sbuf
) + 2];
449 ret
= getnameinfo(sa
, salen(sa
),
454 snprintf(output
, sizeof(output
), "%s#%s", hbuf
, sbuf
);
456 snprintf(output
, sizeof(output
), "(unknown)");
457 PARA_WARNING_LOG("hostname lookup error (%s).\n",
464 * Look up the local or remote side of a connected socket structure.
466 * \param fd The socket descriptor of the connected socket.
467 * \param getname Either \p getsockname() for local, or \p getpeername() for
470 * \return A static character string identifying hostname and port of the
473 * \sa getsockname(2), getpeername(2).
475 static char *__get_sock_name(int fd
, int (*getname
)(int, struct sockaddr
*,
478 struct sockaddr_storage ss
;
479 socklen_t sslen
= sizeof(ss
);
481 if (getname(fd
, (struct sockaddr
*)&ss
, &sslen
) < 0) {
482 static char *dont_know
= "(don't know)";
483 PARA_ERROR_LOG("can not determine address from fd %d: %s\n",
484 fd
, strerror(errno
));
487 return host_and_port(&ss
);
491 * Look up the local side of a connected socket structure.
493 * \param sockfd The file descriptor of the socket.
495 * \return A pointer to a static buffer containing hostname an port. This
496 * buffer must not be freed by the caller.
500 char *local_name(int sockfd
)
502 return __get_sock_name(sockfd
, getsockname
);
506 * Look up the remote side of a connected socket structure.
508 * \param sockfd The file descriptor of the socket.
510 * \return Analogous to the return value of \ref local_name() but for the
515 char *remote_name(int sockfd
)
517 return __get_sock_name(sockfd
, getpeername
);
521 * Extract IPv4 or IPv6-mapped-IPv4 address from sockaddr_storage.
522 * \param ss Container of IPv4/6 address
523 * \return Extracted IPv4 address (different from 0) or 0 if unsuccessful.
527 struct in_addr
extract_v4_addr(const struct sockaddr_storage
*ss
)
529 struct in_addr ia
= {.s_addr
= 0};
530 const struct sockaddr
*sa
= normalize_ip_address(ss
);
532 if (sa
->sa_family
== AF_INET
)
533 ia
= ((struct sockaddr_in
*)sa
)->sin_addr
;
538 * Send a binary buffer.
540 * \param fd The file descriptor.
541 * \param buf The buffer to be sent.
542 * \param len The length of \a buf.
544 * Send out the buffer and try to resend the remaining part in case of short
549 int send_bin_buffer(int fd
, const char *buf
, size_t len
)
552 PARA_CRIT_LOG("len == 0\n");
553 return write_all(fd
, buf
, &len
);
557 * Send a \p NULL-terminated buffer.
559 * \param fd The file descriptor.
560 * \param buf The null-terminated buffer to be send.
562 * This is equivalent to send_bin_buffer(fd, buf, strlen(buf)).
566 int send_buffer(int fd
, const char *buf
)
568 return send_bin_buffer(fd
, buf
, strlen(buf
));
572 * Send a buffer given by a format string.
574 * \param fd The file descriptor.
575 * \param fmt A format string.
579 __printf_2_3
int send_va_buffer(int fd
, const char *fmt
, ...)
584 PARA_VSPRINTF(fmt
, msg
);
585 ret
= send_buffer(fd
, msg
);
591 * Receive data from a file descriptor.
593 * \param fd The file descriptor.
594 * \param buf The buffer to write the data to.
595 * \param size The size of \a buf.
597 * Receive at most \a size bytes from file descriptor \a fd.
599 * \return The number of bytes received on success, negative on errors, zero if
600 * the peer has performed an orderly shutdown.
604 __must_check
int recv_bin_buffer(int fd
, char *buf
, size_t size
)
608 n
= recv(fd
, buf
, size
, 0);
610 return -ERRNO_TO_PARA_ERROR(errno
);
615 * Receive and write terminating NULL byte.
617 * \param fd The file descriptor.
618 * \param buf The buffer to write the data to.
619 * \param size The size of \a buf.
621 * Read at most \a size - 1 bytes from file descriptor \a fd and
622 * write a NULL byte at the end of the received data.
624 * \return The return value of the underlying call to \a recv_bin_buffer().
626 * \sa recv_bin_buffer()
628 int recv_buffer(int fd
, char *buf
, size_t size
)
633 n
= recv_bin_buffer(fd
, buf
, size
- 1);
642 * Wrapper around the accept system call.
644 * \param fd The listening socket.
645 * \param addr Structure which is filled in with the address of the peer socket.
646 * \param size Should contain the size of the structure pointed to by \a addr.
648 * Accept incoming connections on \a addr. Retry if interrupted.
650 * \return The new file descriptor on success, negative on errors.
654 int para_accept(int fd
, void *addr
, socklen_t size
)
659 new_fd
= accept(fd
, (struct sockaddr
*) addr
, &size
);
660 while (new_fd
< 0 && errno
== EINTR
);
661 return new_fd
< 0? -ERRNO_TO_PARA_ERROR(errno
) : new_fd
;
665 * Probe the list of DCCP CCIDs supported locally by the host.
666 * \param ccids Array to be filled in.
667 * \param nccids Length of \a ccids.
668 * \return Pointer to \a ccids, NULL on failure.
670 * NB: This feature is only available on Linux > 2.6.30; on older kernels
671 * ENOPROTOOPT ("Protocol not available") will be returned.
673 const uint8_t *dccp_available_ccids(uint8_t *ccids
, uint8_t *nccids
)
675 int fd
= makesock(AF_UNSPEC
, IPPROTO_DCCP
, 0, NULL
, 0);
680 if (getsockopt(fd
, SOL_DCCP
, DCCP_SOCKOPT_AVAILABLE_CCIDS
,
681 ccids
, (socklen_t
*)nccids
) < 0) {
682 PARA_ERROR_LOG("No DCCP_SOCKOPT_AVAILABLE_CCIDS: %s\n",
688 return *nccids
? ccids
: NULL
;
692 * Prepare a structure for \p AF_UNIX socket addresses.
694 * \param u Pointer to the struct to be prepared.
695 * \param name The socket pathname.
697 * This just copies \a name to the sun_path component of \a u.
699 * \return Positive on success, \p -E_NAME_TOO_LONG if \a name is longer
700 * than \p UNIX_PATH_MAX.
702 static int init_unix_addr(struct sockaddr_un
*u
, const char *name
)
704 if (strlen(name
) >= UNIX_PATH_MAX
)
705 return -E_NAME_TOO_LONG
;
706 memset(u
->sun_path
, 0, UNIX_PATH_MAX
);
707 u
->sun_family
= PF_UNIX
;
708 strcpy(u
->sun_path
, name
);
713 * Prepare, create, and bind a socket for local communication.
715 * \param name The socket pathname.
716 * \param unix_addr Pointer to the \p AF_UNIX socket structure.
717 * \param mode The desired mode of the socket.
719 * This function creates a local socket for sequenced, reliable,
720 * two-way, connection-based byte streams.
722 * \return The file descriptor, on success, negative on errors.
728 int create_local_socket(const char *name
, struct sockaddr_un
*unix_addr
,
733 ret
= init_unix_addr(unix_addr
, name
);
736 ret
= socket(PF_UNIX
, SOCK_STREAM
, 0);
738 return -ERRNO_TO_PARA_ERROR(errno
);
740 ret
= bind(fd
, (struct sockaddr
*) unix_addr
, UNIX_PATH_MAX
);
742 ret
= -ERRNO_TO_PARA_ERROR(errno
);
746 if (chmod(name
, mode
) < 0)
755 * Prepare, create, and connect to a Unix domain socket for local communication.
757 * \param name The socket pathname.
759 * This function creates a local socket for sequenced, reliable, two-way,
760 * connection-based byte streams.
762 * \return The file descriptor, on success, negative on errors.
764 * \sa create_local_socket(), unix(7), connect(2).
766 int create_remote_socket(const char *name
)
768 struct sockaddr_un unix_addr
;
771 ret
= init_unix_addr(&unix_addr
, name
);
774 fd
= socket(PF_UNIX
, SOCK_STREAM
, 0);
776 return -ERRNO_TO_PARA_ERROR(errno
);
777 if (connect(fd
, (struct sockaddr
*)&unix_addr
, sizeof(unix_addr
)) == -1) {
778 ret
= -ERRNO_TO_PARA_ERROR(errno
);
788 ssize_t
send_cred_buffer(int sock
, char *buf
)
790 return send_buffer(sock
, buf
);
792 int recv_cred_buffer(int fd
, char *buf
, size_t size
)
794 return recv_buffer(fd
, buf
, size
) > 0? 1 : -E_RECVMSG
;
796 #else /* HAVE_UCRED */
798 * Send \p NULL-terminated buffer and Unix credentials of the current process.
800 * \param sock The socket file descriptor.
801 * \param buf The buffer to be sent.
803 * \return On success, this call returns the number of characters sent. On
804 * error, \p -E_SENDMSG is returned.
806 * \sa sendmsg(2), okir's Black Hats Manual.
808 ssize_t
send_cred_buffer(int sock
, char *buf
)
810 char control
[sizeof(struct cmsghdr
) + sizeof(struct ucred
)];
812 struct cmsghdr
*cmsg
;
813 static struct iovec iov
;
819 iov
.iov_len
= strlen(buf
);
823 /* compose the message */
824 memset(&msg
, 0, sizeof(msg
));
827 msg
.msg_control
= control
;
828 msg
.msg_controllen
= sizeof(control
);
829 /* attach the ucred struct */
830 cmsg
= CMSG_FIRSTHDR(&msg
);
831 cmsg
->cmsg_level
= SOL_SOCKET
;
832 cmsg
->cmsg_type
= SCM_CREDENTIALS
;
833 cmsg
->cmsg_len
= CMSG_LEN(sizeof(struct ucred
));
834 *(struct ucred
*)CMSG_DATA(cmsg
) = c
;
835 msg
.msg_controllen
= cmsg
->cmsg_len
;
836 ret
= sendmsg(sock
, &msg
, 0);
842 static void dispose_fds(int *fds
, unsigned num
)
846 for (i
= 0; i
< num
; i
++)
851 * Receive a buffer and the Unix credentials of the sending process.
853 * \param fd the socket file descriptor.
854 * \param buf the buffer to store the message.
855 * \param size the size of \a buffer.
857 * \return negative on errors, the user id on success.
859 * \sa recvmsg(2), okir's Black Hats Manual.
861 int recv_cred_buffer(int fd
, char *buf
, size_t size
)
865 struct cmsghdr
*cmsg
;
871 setsockopt(fd
, SOL_SOCKET
, SO_PASSCRED
, &yes
, sizeof(int));
872 memset(&msg
, 0, sizeof(msg
));
873 memset(buf
, 0, size
);
878 msg
.msg_control
= control
;
879 msg
.msg_controllen
= sizeof(control
);
880 if (recvmsg(fd
, &msg
, 0) < 0)
882 result
= -E_SCM_CREDENTIALS
;
883 cmsg
= CMSG_FIRSTHDR(&msg
);
885 if (cmsg
->cmsg_level
== SOL_SOCKET
&& cmsg
->cmsg_type
886 == SCM_CREDENTIALS
) {
887 memcpy(&cred
, CMSG_DATA(cmsg
), sizeof(struct ucred
));
890 if (cmsg
->cmsg_level
== SOL_SOCKET
891 && cmsg
->cmsg_type
== SCM_RIGHTS
) {
892 dispose_fds((int *) CMSG_DATA(cmsg
),
893 (cmsg
->cmsg_len
- CMSG_LEN(0))
896 cmsg
= CMSG_NXTHDR(&msg
, cmsg
);
900 #endif /* HAVE_UCRED */
903 * Receive a buffer and check for a pattern.
905 * \param fd The file descriptor to receive from.
906 * \param pattern The expected pattern.
907 * \param bufsize The size of the internal buffer.
909 * \return Positive if \a pattern was received, negative otherwise.
911 * This function tries to receive at most \a bufsize bytes from file descriptor
912 * \a fd. If at least \p strlen(\a pattern) bytes were received, the beginning
913 * of the received buffer is compared with \a pattern, ignoring case.
915 * \sa recv_buffer(), \sa strncasecmp(3).
917 int recv_pattern(int fd
, const char *pattern
, size_t bufsize
)
919 size_t len
= strlen(pattern
);
920 char *buf
= para_malloc(bufsize
+ 1);
921 int ret
= -E_RECV_PATTERN
, n
= recv_buffer(fd
, buf
, bufsize
+ 1);
925 if (strncasecmp(buf
, pattern
, len
))
930 PARA_NOTICE_LOG("did not receive pattern '%s'\n", pattern
);
932 PARA_NOTICE_LOG("recvd %d bytes: %s\n", n
, buf
);
934 PARA_NOTICE_LOG("%s\n", para_strerror(-n
));