2 * Copyright (C) 1996-2017 The Squid Software Foundation and contributors
4 * Squid software is distributed under GPLv2+ license and includes
5 * contributions from numerous individuals and organizations.
6 * Please see the COPYING and CONTRIBUTORS files for details.
9 /* DEBUG: section 50 Log file handling */
13 #include "comm/Connection.h"
18 #include "log/ModUdp.h"
20 #include "SquidConfig.h"
25 * This logfile UDP module is mostly inspired by a patch by Tim Starling
28 * It doesn't do any UDP buffering - it'd be quite a bit of work for
29 * something which the kernel could be doing for you!
40 logfile_mod_udp_write(Logfile
* lf
, const char *buf
, size_t len
)
42 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
44 s
= write(ll
->fd
, (char const *) buf
, len
);
45 fd_bytes(ll
->fd
, s
, FD_WRITE
);
49 debugs(1, DBG_IMPORTANT
, "logfile (udp): got errno (" << errno
<< "):" << xstrerr(xerrno
));
52 debugs(1, DBG_IMPORTANT
, "logfile (udp): len=" << len
<< ", wrote=" << s
);
56 /* We don't worry about network errors for now */
60 logfile_mod_udp_flush(Logfile
* lf
)
62 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
65 logfile_mod_udp_write(lf
, ll
->buf
, (size_t) ll
->offset
);
70 logfile_mod_udp_writeline(Logfile
* lf
, const char *buf
, size_t len
)
72 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
75 /* buffering disabled */
76 logfile_mod_udp_write(lf
, buf
, len
);
79 if (ll
->offset
> 0 && (ll
->offset
+ len
+ 4) > ll
->bufsz
)
80 logfile_mod_udp_flush(lf
);
82 if (len
> ll
->bufsz
) {
83 /* too big to fit in buffer */
84 logfile_mod_udp_write(lf
, buf
, len
);
88 memcpy(ll
->buf
+ ll
->offset
, buf
, len
);
92 assert(ll
->offset
>= 0);
94 assert((size_t) ll
->offset
<= ll
->bufsz
);
98 logfile_mod_udp_linestart(Logfile
*)
103 logfile_mod_udp_lineend(Logfile
*)
108 logfile_mod_udp_rotate(Logfile
*, const int16_t)
113 logfile_mod_udp_close(Logfile
* lf
)
115 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
129 * This code expects the path to be //host:port
132 logfile_mod_udp_open(Logfile
* lf
, const char *path
, size_t bufsz
, int fatal_flag
)
137 lf
->f_close
= logfile_mod_udp_close
;
138 lf
->f_linewrite
= logfile_mod_udp_writeline
;
139 lf
->f_linestart
= logfile_mod_udp_linestart
;
140 lf
->f_lineend
= logfile_mod_udp_lineend
;
141 lf
->f_flush
= logfile_mod_udp_flush
;
142 lf
->f_rotate
= logfile_mod_udp_rotate
;
144 l_udp_t
*ll
= static_cast<l_udp_t
*>(xcalloc(1, sizeof(*ll
)));
147 if (strncmp(path
, "//", 2) == 0) {
150 strAddr
= xstrdup(path
);
151 if (!GetHostWithPort(strAddr
, &addr
)) {
152 if (lf
->flags
.fatal
) {
153 fatalf("Invalid UDP logging address '%s'\n", lf
->path
);
155 debugs(50, DBG_IMPORTANT
, "Invalid UDP logging address '" << lf
->path
<< "'");
162 Ip::Address any_addr
;
163 any_addr
.setAnyAddr();
165 // require the sending UDP port to be of the right family for the destination address.
169 ll
->fd
= comm_open(SOCK_DGRAM
, IPPROTO_UDP
, any_addr
, COMM_NONBLOCKING
, "UDP log socket");
172 if (lf
->flags
.fatal
) {
173 fatalf("Unable to open UDP socket for logging\n");
175 debugs(50, DBG_IMPORTANT
, "Unable to open UDP socket for logging");
178 } else if (!comm_connect_addr(ll
->fd
, addr
)) {
180 if (lf
->flags
.fatal
) {
181 fatalf("Unable to connect to %s for UDP log: %s\n", lf
->path
, xstrerr(xerrno
));
183 debugs(50, DBG_IMPORTANT
, "Unable to connect to " << lf
->path
<< " for UDP log: " << xstrerr(xerrno
));
188 if (ENOENT
== xerrno
&& fatal_flag
) {
189 fatalf("Cannot open '%s' because\n"
190 "\tthe parent directory does not exist.\n"
191 "\tPlease create the directory.\n", path
);
192 } else if (EACCES
== xerrno
&& fatal_flag
) {
193 fatalf("Cannot open '%s' for writing.\n"
194 "\tThe parent directory must be writeable by the\n"
195 "\tuser '%s', which is the cache_effective_user\n"
196 "\tset in squid.conf.", path
, Config
.effectiveUser
);
198 debugs(50, DBG_IMPORTANT
, "logfileOpen (UDP): " << lf
->path
<< ": " << xstrerr(xerrno
));
202 /* Force buffer size to something roughly fitting inside an MTU */
204 * XXX note the receive side needs to receive the whole packet at once;
205 * applications like netcat have a small default receive buffer and will
210 ll
->buf
= static_cast<char*>(xmalloc(bufsz
));