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rsyslog.openSUSE_Leap_42.1_Update
rsyslog-8.17.x-enable-IPFREEBIND_socket_option....
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File rsyslog-8.17.x-enable-IPFREEBIND_socket_option.patch of Package rsyslog.openSUSE_Leap_42.1_Update
From a6fa31c2c42a5162a25c90f58cce2247d6f3b464 Mon Sep 17 00:00:00 2001 From: Marius Tomaschewski <mt@suse.de> Date: Mon, 14 Mar 2016 12:28:54 +0100 Subject: [PATCH 1/4] imudp: Use IP_FREEBIND option for UDP sockets Rather a proof of concept patch (originally by Marius) that allows rsyslog to bind UDP ports even w/out specific interface being up at the moment. --- runtime/net.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/runtime/net.c b/runtime/net.c index 01129d6..f65f4d9 100644 --- a/runtime/net.c +++ b/runtime/net.c @@ -1348,6 +1348,9 @@ int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer, int rcvbu } if(bIsServer) { + if (setsockopt(*s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on)) < 0) + dbgprintf("unable to enable free IP bind socket option"); + /* rgerhards, 2007-06-22: if we run on a kernel that does not support * the IPV6_V6ONLY socket option, we need to use a work-around. On such * systems the IPv6 socket does also accept IPv4 sockets. So an IPv4 -- 2.6.2 From 5f12c9b57e208eb1d6271aecf8dee8af310762db Mon Sep 17 00:00:00 2001 From: Nirmoy Das <ndas@suse.de> Date: Tue, 22 Mar 2016 15:42:53 +0100 Subject: [PATCH 2/4] imudp: add config option for IP_FREEBIND socket option ipfreebind config option by default enables IP_FREEBIND socket option with warn message on success. --- plugins/imudp/imudp.c | 10 +++++++++- plugins/omudpspoof/omudpspoof.c | 2 +- runtime/net.c | 17 +++++++++++++---- runtime/net.h | 2 +- tools/omfwd.c | 2 +- 5 files changed, 25 insertions(+), 8 deletions(-) diff --git a/plugins/imudp/imudp.c b/plugins/imudp/imudp.c index 82a4a34..5507787 100644 --- a/plugins/imudp/imudp.c +++ b/plugins/imudp/imudp.c @@ -116,6 +116,10 @@ struct instanceConf_s { int ratelimitInterval; int ratelimitBurst; int rcvbuf; /* 0 means: do not set, keep OS default */ + /* 0 means: IP_FREEBIND is disabled + 1 means: IP_FREEBIND enabled + warning disabled + 1+ means: IP+FREEBIND enabled + warning enabled */ + int ipfreebind; struct instanceConf_s *next; sbool bAppendPortToInpname; }; @@ -179,6 +183,7 @@ static struct cnfparamdescr inppdescr[] = { { "ratelimit.interval", eCmdHdlrInt, 0 }, { "ratelimit.burst", eCmdHdlrInt, 0 }, { "rcvbufsize", eCmdHdlrSize, 0 }, + { "ipfreebind", eCmdHdlrInt, 0 }, { "ruleset", eCmdHdlrString, 0 } }; static struct cnfparamblk inppblk = @@ -209,6 +214,7 @@ createInstance(instanceConf_t **pinst) inst->ratelimitBurst = 10000; /* arbitrary high limit */ inst->ratelimitInterval = 0; /* off */ inst->rcvbuf = 0; + inst->ipfreebind = 2; /* IP_FREEBIND is enabled with warning message */ inst->dfltTZ = NULL; /* node created, let's add to config */ @@ -285,7 +291,7 @@ addListner(instanceConf_t *inst) DBGPRINTF("Trying to open syslog UDP ports at %s:%s.\n", bindName, inst->pszBindPort); - newSocks = net.create_udp_socket(bindAddr, port, 1, inst->rcvbuf); + newSocks = net.create_udp_socket(bindAddr, port, 1, inst->rcvbuf, inst->ipfreebind); if(newSocks != NULL) { /* we now need to add the new sockets to the existing set */ /* ready to copy */ @@ -933,6 +939,8 @@ createListner(es_str_t *port, struct cnfparamvals *pvals) inst->ratelimitInterval = (int) pvals[i].val.d.n; } else if(!strcmp(inppblk.descr[i].name, "rcvbufsize")) { inst->rcvbuf = (int) pvals[i].val.d.n; + } else if(!strcmp(inppblk.descr[i].name, "ipfreebind")) { + inst->ipfreebind = (int) pvals[i].val.d.n; } else { dbgprintf("imudp: program error, non-handled " "param '%s'\n", inppblk.descr[i].name); diff --git a/plugins/omudpspoof/omudpspoof.c b/plugins/omudpspoof/omudpspoof.c index 5bcd91c..4176cf0 100644 --- a/plugins/omudpspoof/omudpspoof.c +++ b/plugins/omudpspoof/omudpspoof.c @@ -573,7 +573,7 @@ static rsRetVal doTryResume(wrkrInstanceData_t *pWrkrData) } DBGPRINTF("%s found, resuming.\n", pData->host); pWrkrData->f_addr = res; - pWrkrData->pSockArray = net.create_udp_socket((uchar*)pData->host, NULL, 0, 0); + pWrkrData->pSockArray = net.create_udp_socket((uchar*)pData->host, NULL, 0, 0, 0); finalize_it: if(iRet != RS_RET_OK) { diff --git a/runtime/net.c b/runtime/net.c index f65f4d9..e773a7a 100644 --- a/runtime/net.c +++ b/runtime/net.c @@ -1208,7 +1208,7 @@ void closeUDPListenSockets(int *pSockArr) * 1 - server, 0 - client * param rcvbuf indicates desired rcvbuf size; 0 means OS default */ -int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer, int rcvbuf) +int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer, int rcvbuf, int ipfreebind) { struct addrinfo hints, *res, *r; int error, maxs, *s, *socks, on = 1; @@ -1348,8 +1348,6 @@ int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer, int rcvbu } if(bIsServer) { - if (setsockopt(*s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on)) < 0) - dbgprintf("unable to enable free IP bind socket option"); /* rgerhards, 2007-06-22: if we run on a kernel that does not support * the IPV6_V6ONLY socket option, we need to use a work-around. On such @@ -1363,7 +1361,18 @@ int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer, int rcvbu && (errno != EADDRINUSE) # endif ) { - errmsg.LogError(errno, NO_ERRCODE, "bind"); + if (errno == EADDRNOTAVAIL && ipfreebind) { + if (setsockopt(*s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on)) < 0) { + errmsg.LogError(errno, NO_ERRCODE, "setsockopt(IP_FREEBIND)"); + } + else if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { + errmsg.LogError(errno, NO_ERRCODE, "bind with IP_FREEBIND"); + } else { + if (ipfreebind > 1) + errmsg.LogMsg(0, RS_RET_OK_WARN, LOG_WARNING, "bound address %s IP free", hostname); + continue; + } + } close(*s); *s = -1; continue; diff --git a/runtime/net.h b/runtime/net.h index d7a7b51..b664fb4 100644 --- a/runtime/net.h +++ b/runtime/net.h @@ -137,7 +137,7 @@ BEGINinterface(net) /* name must also be changed in ENDinterface macro! */ void (*PrintAllowedSenders)(int iListToPrint); void (*clearAllowedSenders)(uchar*); void (*debugListenInfo)(int fd, char *type); - int *(*create_udp_socket)(uchar *hostname, uchar *LogPort, int bIsServer, int rcvbuf); + int *(*create_udp_socket)(uchar *hostname, uchar *LogPort, int bIsServer, int rcvbuf, int ipfreebind); void (*closeUDPListenSockets)(int *finet); int (*isAllowedSender)(uchar *pszType, struct sockaddr *pFrom, const char *pszFromHost); /* deprecated! */ rsRetVal (*getLocalHostname)(uchar**); diff --git a/tools/omfwd.c b/tools/omfwd.c index f2a721c..29d7f14 100644 --- a/tools/omfwd.c +++ b/tools/omfwd.c @@ -760,7 +760,7 @@ static rsRetVal doTryResume(wrkrInstanceData_t *pWrkrData) pWrkrData->f_addr = res; pWrkrData->bIsConnected = 1; if(pWrkrData->pSockArray == NULL) { - pWrkrData->pSockArray = net.create_udp_socket((uchar*)pData->target, NULL, 0, 0); + pWrkrData->pSockArray = net.create_udp_socket((uchar*)pData->target, NULL, 0, 0, 0); } } else { CHKiRet(TCPSendInit((void*)pWrkrData)); -- 2.6.2 From 3e3bd32f10e17dd66b64c2667ea2e49d65afca6f Mon Sep 17 00:00:00 2001 From: Nirmoy Das <ndas@suse.de> Date: Wed, 23 Mar 2016 10:46:55 +0100 Subject: [PATCH 3/4] cleanup/beautify, removed numerical with defines --- plugins/imudp/imudp.c | 2 +- runtime/net.c | 4 ++-- runtime/net.h | 5 +++++ 3 files changed, 8 insertions(+), 3 deletions(-) diff --git a/plugins/imudp/imudp.c b/plugins/imudp/imudp.c index 5507787..37d8aad 100644 --- a/plugins/imudp/imudp.c +++ b/plugins/imudp/imudp.c @@ -214,7 +214,7 @@ createInstance(instanceConf_t **pinst) inst->ratelimitBurst = 10000; /* arbitrary high limit */ inst->ratelimitInterval = 0; /* off */ inst->rcvbuf = 0; - inst->ipfreebind = 2; /* IP_FREEBIND is enabled with warning message */ + inst->ipfreebind = IPFREEBIND_ENABLED_WITH_LOG; inst->dfltTZ = NULL; /* node created, let's add to config */ diff --git a/runtime/net.c b/runtime/net.c index e773a7a..4cbedba 100644 --- a/runtime/net.c +++ b/runtime/net.c @@ -1361,14 +1361,14 @@ int *create_udp_socket(uchar *hostname, uchar *pszPort, int bIsServer, int rcvbu && (errno != EADDRINUSE) # endif ) { - if (errno == EADDRNOTAVAIL && ipfreebind) { + if (errno == EADDRNOTAVAIL && ipfreebind != IPFREEBIND_DISABLED) { if (setsockopt(*s, IPPROTO_IP, IP_FREEBIND, &on, sizeof(on)) < 0) { errmsg.LogError(errno, NO_ERRCODE, "setsockopt(IP_FREEBIND)"); } else if (bind(*s, r->ai_addr, r->ai_addrlen) < 0) { errmsg.LogError(errno, NO_ERRCODE, "bind with IP_FREEBIND"); } else { - if (ipfreebind > 1) + if (ipfreebind >= IPFREEBIND_ENABLED_WITH_LOG) errmsg.LogMsg(0, RS_RET_OK_WARN, LOG_WARNING, "bound address %s IP free", hostname); continue; } diff --git a/runtime/net.h b/runtime/net.h index b664fb4..b2f49e3 100644 --- a/runtime/net.h +++ b/runtime/net.h @@ -39,6 +39,11 @@ typedef enum _TCPFRAMINGMODE { #define ADDR_NAME 0x01 /* address is hostname wildcard) */ #define ADDR_PRI6 0x02 /* use IPv6 address prior to IPv4 when resolving */ +/* defines for IP_FREEBIND, currently being used in imudp */ +#define IPFREEBIND_DISABLED 0x00 /* don't enable IP_FREEBIND in sock option */ +#define IPFREEBIND_ENABLED_NO_LOG 0x01 /* enable IP_FREEBIND but no warn on success */ +#define IPFREEBIND_ENABLED_WITH_LOG 0x02 /* enable IP_FREEBIND and warn on success */ + #ifdef OS_BSD # ifndef _KERNEL # define s6_addr32 __u6_addr.__u6_addr32 -- 2.6.2 From 66ce7eb11351eb9ece917e50b4218e4c55ca15e9 Mon Sep 17 00:00:00 2001 From: Nirmoy Das <ndas@suse.de> Date: Tue, 29 Mar 2016 17:16:01 +0200 Subject: [PATCH 4/4] portability: define IP_FREEBIND if it is not already defined. --- runtime/net.h | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/runtime/net.h b/runtime/net.h index b2f49e3..6809570 100644 --- a/runtime/net.h +++ b/runtime/net.h @@ -39,6 +39,10 @@ typedef enum _TCPFRAMINGMODE { #define ADDR_NAME 0x01 /* address is hostname wildcard) */ #define ADDR_PRI6 0x02 /* use IPv6 address prior to IPv4 when resolving */ +/* portability: incase IP_FREEBIND is not defined */ +#ifndef IP_FREEBIND +#define IP_FREEBIND 0 +#endif /* defines for IP_FREEBIND, currently being used in imudp */ #define IPFREEBIND_DISABLED 0x00 /* don't enable IP_FREEBIND in sock option */ #define IPFREEBIND_ENABLED_NO_LOG 0x01 /* enable IP_FREEBIND but no warn on success */ -- 2.6.2
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