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Diffstat (limited to 'secure/lib/libcrypto/man/BIO_s_accept.3')
| -rw-r--r-- | secure/lib/libcrypto/man/BIO_s_accept.3 | 344 |
1 files changed, 344 insertions, 0 deletions
diff --git a/secure/lib/libcrypto/man/BIO_s_accept.3 b/secure/lib/libcrypto/man/BIO_s_accept.3 new file mode 100644 index 0000000..13fa94d --- /dev/null +++ b/secure/lib/libcrypto/man/BIO_s_accept.3 @@ -0,0 +1,344 @@ +.\" Automatically generated by Pod::Man v1.37, Pod::Parser v1.37 +.\" +.\" Standard preamble: +.\" ======================================================================== +.de Sh \" Subsection heading +.br +.if t .Sp +.ne 5 +.PP +\fB\\$1\fR +.PP +.. +.de Sp \" Vertical space (when we can't use .PP) +.if t .sp .5v +.if n .sp +.. +.de Vb \" Begin verbatim text +.ft CW +.nf +.ne \\$1 +.. +.de Ve \" End verbatim text +.ft R +.fi +.. +.\" Set up some character translations and predefined strings. \*(-- will +.\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left +.\" double quote, and \*(R" will give a right double quote. | will give a +.\" real vertical bar. \*(C+ will give a nicer C++. Capital omega is used to +.\" do unbreakable dashes and therefore won't be available. \*(C` and \*(C' +.\" expand to `' in nroff, nothing in troff, for use with C<>. +.tr \(*W-|\(bv\*(Tr +.ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' +.ie n \{\ +. ds -- \(*W- +. ds PI pi +. if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch +. if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch +. ds L" "" +. ds R" "" +. ds C` "" +. ds C' "" +'br\} +.el\{\ +. ds -- \|\(em\| +. ds PI \(*p +. ds L" `` +. ds R" '' +'br\} +.\" +.\" If the F register is turned on, we'll generate index entries on stderr for +.\" titles (.TH), headers (.SH), subsections (.Sh), items (.Ip), and index +.\" entries marked with X<> in POD. Of course, you'll have to process the +.\" output yourself in some meaningful fashion. +.if \nF \{\ +. de IX +. tm Index:\\$1\t\\n%\t"\\$2" +.. +. nr % 0 +. rr F +.\} +.\" +.\" For nroff, turn off justification. Always turn off hyphenation; it makes +.\" way too many mistakes in technical documents. +.hy 0 +.if n .na +.\" +.\" Accent mark definitions (@(#)ms.acc 1.5 88/02/08 SMI; from UCB 4.2). +.\" Fear. Run. Save yourself. No user-serviceable parts. +. \" fudge factors for nroff and troff +.if n \{\ +. ds #H 0 +. ds #V .8m +. ds #F .3m +. ds #[ \f1 +. ds #] \fP +.\} +.if t \{\ +. ds #H ((1u-(\\\\n(.fu%2u))*.13m) +. ds #V .6m +. ds #F 0 +. ds #[ \& +. ds #] \& +.\} +. \" simple accents for nroff and troff +.if n \{\ +. ds ' \& +. ds ` \& +. ds ^ \& +. ds , \& +. ds ~ ~ +. ds / +.\} +.if t \{\ +. ds ' \\k:\h'-(\\n(.wu*8/10-\*(#H)'\'\h"|\\n:u" +. ds ` \\k:\h'-(\\n(.wu*8/10-\*(#H)'\`\h'|\\n:u' +. ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'^\h'|\\n:u' +. ds , \\k:\h'-(\\n(.wu*8/10)',\h'|\\n:u' +. ds ~ \\k:\h'-(\\n(.wu-\*(#H-.1m)'~\h'|\\n:u' +. ds / \\k:\h'-(\\n(.wu*8/10-\*(#H)'\z\(sl\h'|\\n:u' +.\} +. \" troff and (daisy-wheel) nroff accents +.ds : \\k:\h'-(\\n(.wu*8/10-\*(#H+.1m+\*(#F)'\v'-\*(#V'\z.\h'.2m+\*(#F'.\h'|\\n:u'\v'\*(#V' +.ds 8 \h'\*(#H'\(*b\h'-\*(#H' +.ds o \\k:\h'-(\\n(.wu+\w'\(de'u-\*(#H)/2u'\v'-.3n'\*(#[\z\(de\v'.3n'\h'|\\n:u'\*(#] +.ds d- \h'\*(#H'\(pd\h'-\w'~'u'\v'-.25m'\f2\(hy\fP\v'.25m'\h'-\*(#H' +.ds D- D\\k:\h'-\w'D'u'\v'-.11m'\z\(hy\v'.11m'\h'|\\n:u' +.ds th \*(#[\v'.3m'\s+1I\s-1\v'-.3m'\h'-(\w'I'u*2/3)'\s-1o\s+1\*(#] +.ds Th \*(#[\s+2I\s-2\h'-\w'I'u*3/5'\v'-.3m'o\v'.3m'\*(#] +.ds ae a\h'-(\w'a'u*4/10)'e +.ds Ae A\h'-(\w'A'u*4/10)'E +. \" corrections for vroff +.if v .ds ~ \\k:\h'-(\\n(.wu*9/10-\*(#H)'\s-2\u~\d\s+2\h'|\\n:u' +.if v .ds ^ \\k:\h'-(\\n(.wu*10/11-\*(#H)'\v'-.4m'^\v'.4m'\h'|\\n:u' +. \" for low resolution devices (crt and lpr) +.if \n(.H>23 .if \n(.V>19 \ +\{\ +. ds : e +. ds 8 ss +. ds o a +. ds d- d\h'-1'\(ga +. ds D- D\h'-1'\(hy +. ds th \o'bp' +. ds Th \o'LP' +. ds ae ae +. ds Ae AE +.\} +.rm #[ #] #H #V #F C +.\" ======================================================================== +.\" +.IX Title "BIO_s_accept 3" +.TH BIO_s_accept 3 "2009-06-14" "0.9.8k" "OpenSSL" +.SH "NAME" +BIO_s_accept, BIO_set_accept_port, BIO_get_accept_port, +BIO_set_nbio_accept, BIO_set_accept_bios, BIO_set_bind_mode, +BIO_get_bind_mode, BIO_do_accept \- accept BIO +.SH "SYNOPSIS" +.IX Header "SYNOPSIS" +.Vb 1 +\& #include <openssl/bio.h> +.Ve +.PP +.Vb 1 +\& BIO_METHOD *BIO_s_accept(void); +.Ve +.PP +.Vb 2 +\& long BIO_set_accept_port(BIO *b, char *name); +\& char *BIO_get_accept_port(BIO *b); +.Ve +.PP +.Vb 1 +\& BIO *BIO_new_accept(char *host_port); +.Ve +.PP +.Vb 2 +\& long BIO_set_nbio_accept(BIO *b, int n); +\& long BIO_set_accept_bios(BIO *b, char *bio); +.Ve +.PP +.Vb 2 +\& long BIO_set_bind_mode(BIO *b, long mode); +\& long BIO_get_bind_mode(BIO *b, long dummy); +.Ve +.PP +.Vb 3 +\& #define BIO_BIND_NORMAL 0 +\& #define BIO_BIND_REUSEADDR_IF_UNUSED 1 +\& #define BIO_BIND_REUSEADDR 2 +.Ve +.PP +.Vb 1 +\& int BIO_do_accept(BIO *b); +.Ve +.SH "DESCRIPTION" +.IX Header "DESCRIPTION" +\&\fIBIO_s_accept()\fR returns the accept \s-1BIO\s0 method. This is a wrapper +round the platform's \s-1TCP/IP\s0 socket accept routines. +.PP +Using accept BIOs, \s-1TCP/IP\s0 connections can be accepted and data +transferred using only \s-1BIO\s0 routines. In this way any platform +specific operations are hidden by the \s-1BIO\s0 abstraction. +.PP +Read and write operations on an accept \s-1BIO\s0 will perform I/O +on the underlying connection. If no connection is established +and the port (see below) is set up properly then the \s-1BIO\s0 +waits for an incoming connection. +.PP +Accept BIOs support \fIBIO_puts()\fR but not \fIBIO_gets()\fR. +.PP +If the close flag is set on an accept \s-1BIO\s0 then any active +connection on that chain is shutdown and the socket closed when +the \s-1BIO\s0 is freed. +.PP +Calling \fIBIO_reset()\fR on a accept \s-1BIO\s0 will close any active +connection and reset the \s-1BIO\s0 into a state where it awaits another +incoming connection. +.PP +\&\fIBIO_get_fd()\fR and \fIBIO_set_fd()\fR can be called to retrieve or set +the accept socket. See \fIBIO_s_fd\fR\|(3) +.PP +\&\fIBIO_set_accept_port()\fR uses the string \fBname\fR to set the accept +port. The port is represented as a string of the form \*(L"host:port\*(R", +where \*(L"host\*(R" is the interface to use and \*(L"port\*(R" is the port. +Either or both values can be \*(L"*\*(R" which is interpreted as meaning +any interface or port respectively. \*(L"port\*(R" has the same syntax +as the port specified in \fIBIO_set_conn_port()\fR for connect BIOs, +that is it can be a numerical port string or a string to lookup +using \fIgetservbyname()\fR and a string table. +.PP +\&\fIBIO_new_accept()\fR combines \fIBIO_new()\fR and \fIBIO_set_accept_port()\fR into +a single call: that is it creates a new accept \s-1BIO\s0 with port +\&\fBhost_port\fR. +.PP +\&\fIBIO_set_nbio_accept()\fR sets the accept socket to blocking mode +(the default) if \fBn\fR is 0 or non blocking mode if \fBn\fR is 1. +.PP +\&\fIBIO_set_accept_bios()\fR can be used to set a chain of BIOs which +will be duplicated and prepended to the chain when an incoming +connection is received. This is useful if, for example, a +buffering or \s-1SSL\s0 \s-1BIO\s0 is required for each connection. The +chain of BIOs must not be freed after this call, they will +be automatically freed when the accept \s-1BIO\s0 is freed. +.PP +\&\fIBIO_set_bind_mode()\fR and \fIBIO_get_bind_mode()\fR set and retrieve +the current bind mode. If \s-1BIO_BIND_NORMAL\s0 (the default) is set +then another socket cannot be bound to the same port. If +\&\s-1BIO_BIND_REUSEADDR\s0 is set then other sockets can bind to the +same port. If \s-1BIO_BIND_REUSEADDR_IF_UNUSED\s0 is set then and +attempt is first made to use \s-1BIO_BIN_NORMAL\s0, if this fails +and the port is not in use then a second attempt is made +using \s-1BIO_BIND_REUSEADDR\s0. +.PP +\&\fIBIO_do_accept()\fR serves two functions. When it is first +called, after the accept \s-1BIO\s0 has been setup, it will attempt +to create the accept socket and bind an address to it. Second +and subsequent calls to \fIBIO_do_accept()\fR will await an incoming +connection, or request a retry in non blocking mode. +.SH "NOTES" +.IX Header "NOTES" +When an accept \s-1BIO\s0 is at the end of a chain it will await an +incoming connection before processing I/O calls. When an accept +\&\s-1BIO\s0 is not at then end of a chain it passes I/O calls to the next +\&\s-1BIO\s0 in the chain. +.PP +When a connection is established a new socket \s-1BIO\s0 is created for +the connection and appended to the chain. That is the chain is now +accept\->socket. This effectively means that attempting I/O on +an initial accept socket will await an incoming connection then +perform I/O on it. +.PP +If any additional BIOs have been set using \fIBIO_set_accept_bios()\fR +then they are placed between the socket and the accept \s-1BIO\s0, +that is the chain will be accept\->otherbios\->socket. +.PP +If a server wishes to process multiple connections (as is normally +the case) then the accept \s-1BIO\s0 must be made available for further +incoming connections. This can be done by waiting for a connection and +then calling: +.PP +.Vb 1 +\& connection = BIO_pop(accept); +.Ve +.PP +After this call \fBconnection\fR will contain a \s-1BIO\s0 for the recently +established connection and \fBaccept\fR will now be a single \s-1BIO\s0 +again which can be used to await further incoming connections. +If no further connections will be accepted the \fBaccept\fR can +be freed using \fIBIO_free()\fR. +.PP +If only a single connection will be processed it is possible to +perform I/O using the accept \s-1BIO\s0 itself. This is often undesirable +however because the accept \s-1BIO\s0 will still accept additional incoming +connections. This can be resolved by using \fIBIO_pop()\fR (see above) +and freeing up the accept \s-1BIO\s0 after the initial connection. +.PP +If the underlying accept socket is non-blocking and \fIBIO_do_accept()\fR is +called to await an incoming connection it is possible for +\&\fIBIO_should_io_special()\fR with the reason \s-1BIO_RR_ACCEPT\s0. If this happens +then it is an indication that an accept attempt would block: the application +should take appropriate action to wait until the underlying socket has +accepted a connection and retry the call. +.PP +\&\fIBIO_set_accept_port()\fR, \fIBIO_get_accept_port()\fR, \fIBIO_set_nbio_accept()\fR, +\&\fIBIO_set_accept_bios()\fR, \fIBIO_set_bind_mode()\fR, \fIBIO_get_bind_mode()\fR and +\&\fIBIO_do_accept()\fR are macros. +.SH "RETURN VALUES" +.IX Header "RETURN VALUES" +\&\s-1TBA\s0 +.SH "EXAMPLE" +.IX Header "EXAMPLE" +This example accepts two connections on port 4444, sends messages +down each and finally closes both down. +.PP +.Vb 3 +\& BIO *abio, *cbio, *cbio2; +\& ERR_load_crypto_strings(); +\& abio = BIO_new_accept("4444"); +.Ve +.PP +.Vb 6 +\& /* First call to BIO_accept() sets up accept BIO */ +\& if(BIO_do_accept(abio) <= 0) { +\& fprintf(stderr, "Error setting up accept\en"); +\& ERR_print_errors_fp(stderr); +\& exit(0); +\& } +.Ve +.PP +.Vb 23 +\& /* Wait for incoming connection */ +\& if(BIO_do_accept(abio) <= 0) { +\& fprintf(stderr, "Error accepting connection\en"); +\& ERR_print_errors_fp(stderr); +\& exit(0); +\& } +\& fprintf(stderr, "Connection 1 established\en"); +\& /* Retrieve BIO for connection */ +\& cbio = BIO_pop(abio); +\& BIO_puts(cbio, "Connection 1: Sending out Data on initial connection\en"); +\& fprintf(stderr, "Sent out data on connection 1\en"); +\& /* Wait for another connection */ +\& if(BIO_do_accept(abio) <= 0) { +\& fprintf(stderr, "Error accepting connection\en"); +\& ERR_print_errors_fp(stderr); +\& exit(0); +\& } +\& fprintf(stderr, "Connection 2 established\en"); +\& /* Close accept BIO to refuse further connections */ +\& cbio2 = BIO_pop(abio); +\& BIO_free(abio); +\& BIO_puts(cbio2, "Connection 2: Sending out Data on second\en"); +\& fprintf(stderr, "Sent out data on connection 2\en"); +.Ve +.PP +.Vb 4 +\& BIO_puts(cbio, "Connection 1: Second connection established\en"); +\& /* Close the two established connections */ +\& BIO_free(cbio); +\& BIO_free(cbio2); +.Ve +.SH "SEE ALSO" +.IX Header "SEE ALSO" +\&\s-1TBA\s0 |
