2 * Copyright (C) 1996-2015 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
);
48 debugs(1, DBG_IMPORTANT
, "logfile (udp): got errno (" << errno
<< "):" << xstrerror());
51 debugs(1, DBG_IMPORTANT
, "logfile (udp): len=" << len
<< ", wrote=" << s
);
55 /* We don't worry about network errors for now */
59 logfile_mod_udp_flush(Logfile
* lf
)
61 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
64 logfile_mod_udp_write(lf
, ll
->buf
, (size_t) ll
->offset
);
69 logfile_mod_udp_writeline(Logfile
* lf
, const char *buf
, size_t len
)
71 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
74 /* buffering disabled */
75 logfile_mod_udp_write(lf
, buf
, len
);
78 if (ll
->offset
> 0 && (ll
->offset
+ len
+ 4) > ll
->bufsz
)
79 logfile_mod_udp_flush(lf
);
81 if (len
> ll
->bufsz
) {
82 /* too big to fit in buffer */
83 logfile_mod_udp_write(lf
, buf
, len
);
87 memcpy(ll
->buf
+ ll
->offset
, buf
, len
);
91 assert(ll
->offset
>= 0);
93 assert((size_t) ll
->offset
<= ll
->bufsz
);
97 logfile_mod_udp_linestart(Logfile
*)
102 logfile_mod_udp_lineend(Logfile
*)
107 logfile_mod_udp_rotate(Logfile
*, const int16_t)
112 logfile_mod_udp_close(Logfile
* lf
)
114 l_udp_t
*ll
= (l_udp_t
*) lf
->data
;
128 * This code expects the path to be //host:port
131 logfile_mod_udp_open(Logfile
* lf
, const char *path
, size_t bufsz
, int fatal_flag
)
136 lf
->f_close
= logfile_mod_udp_close
;
137 lf
->f_linewrite
= logfile_mod_udp_writeline
;
138 lf
->f_linestart
= logfile_mod_udp_linestart
;
139 lf
->f_lineend
= logfile_mod_udp_lineend
;
140 lf
->f_flush
= logfile_mod_udp_flush
;
141 lf
->f_rotate
= logfile_mod_udp_rotate
;
143 l_udp_t
*ll
= static_cast<l_udp_t
*>(xcalloc(1, sizeof(*ll
)));
146 if (strncmp(path
, "//", 2) == 0) {
149 strAddr
= xstrdup(path
);
150 if (!GetHostWithPort(strAddr
, &addr
)) {
151 if (lf
->flags
.fatal
) {
152 fatalf("Invalid UDP logging address '%s'\n", lf
->path
);
154 debugs(50, DBG_IMPORTANT
, "Invalid UDP logging address '" << lf
->path
<< "'");
161 Ip::Address any_addr
;
162 any_addr
.setAnyAddr();
164 // require the sending UDP port to be of the right family for the destination address.
168 ll
->fd
= comm_open(SOCK_DGRAM
, IPPROTO_UDP
, any_addr
, COMM_NONBLOCKING
, "UDP log socket");
170 if (lf
->flags
.fatal
) {
171 fatalf("Unable to open UDP socket for logging\n");
173 debugs(50, DBG_IMPORTANT
, "Unable to open UDP socket for logging");
176 } else if (!comm_connect_addr(ll
->fd
, addr
)) {
177 if (lf
->flags
.fatal
) {
178 fatalf("Unable to connect to %s for UDP log: %s\n", lf
->path
, xstrerror());
180 debugs(50, DBG_IMPORTANT
, "Unable to connect to " << lf
->path
<< " for UDP log: " << xstrerror());
185 if (ENOENT
== errno
&& fatal_flag
) {
186 fatalf("Cannot open '%s' because\n"
187 "\tthe parent directory does not exist.\n"
188 "\tPlease create the directory.\n", path
);
189 } else if (EACCES
== errno
&& fatal_flag
) {
190 fatalf("Cannot open '%s' for writing.\n"
191 "\tThe parent directory must be writeable by the\n"
192 "\tuser '%s', which is the cache_effective_user\n"
193 "\tset in squid.conf.", path
, Config
.effectiveUser
);
195 debugs(50, DBG_IMPORTANT
, "logfileOpen (UDP): " << lf
->path
<< ": " << xstrerror());
199 /* Force buffer size to something roughly fitting inside an MTU */
201 * XXX note the receive side needs to receive the whole packet at once;
202 * applications like netcat have a small default receive buffer and will
207 ll
->buf
= static_cast<char*>(xmalloc(bufsz
));