From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Gibson <david@gibson.dropbear.id.au>
To: passt-dev@passt.top
Subject: Re: [PATCH 1/8] Move logging functions to a new file, log.c
Date: Fri, 07 Oct 2022 17:13:45 +1100
Message-ID: <Yz/DmSaaX+XmEuen@yekko>
In-Reply-To: <20221007004742.1188933-2-sbrivio@redhat.com>
MIME-Version: 1.0
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On Fri, Oct 07, 2022 at 02:47:35AM +0200, Stefano Brivio wrote:
> Logging to file is going to add some further complexity that we don't
> want to squeeze into util.c.
>=20
> Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com>

Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>

> ---
>  Makefile     |   4 +-
>  conf.c       |   1 +
>  dhcp.c       |   1 +
>  dhcpv6.c     |   1 +
>  icmp.c       |   1 +
>  isolation.c  |   1 +
>  log.c        | 143 +++++++++++++++++++++++++++++++++++++++++++++++++++
>  log.h        |  26 ++++++++++
>  ndp.c        |   1 +
>  netlink.c    |   1 +
>  packet.c     |   1 +
>  passt.c      |   1 +
>  pasta.c      |   1 +
>  pcap.c       |   1 +
>  tap.c        |   1 +
>  tcp.c        |   1 +
>  tcp_splice.c |   1 +
>  udp.c        |   1 +
>  util.c       | 121 +------------------------------------------
>  util.h       |  16 ------
>  20 files changed, 187 insertions(+), 138 deletions(-)
>  create mode 100644 log.c
>  create mode 100644 log.h
>=20
> diff --git a/Makefile b/Makefile
> index d4b623f..74bbfeb 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -33,8 +33,8 @@ FLAGS +=3D -DRLIMIT_STACK_VAL=3D$(RLIMIT_STACK_VAL)
>  FLAGS +=3D -DARCH=3D\"$(TARGET_ARCH)\"
> =20
>  PASST_SRCS =3D arch.c arp.c checksum.c conf.c dhcp.c dhcpv6.c icmp.c igmp.=
c \
> -	isolation.c lineread.c mld.c ndp.c netlink.c packet.c passt.c pasta.c \
> -	pcap.c siphash.c tap.c tcp.c tcp_splice.c udp.c util.c
> +	isolation.c lineread.c log.c mld.c ndp.c netlink.c packet.c passt.c \
> +	pasta.c pcap.c siphash.c tap.c tcp.c tcp_splice.c udp.c util.c
>  QRAP_SRCS =3D qrap.c
>  SRCS =3D $(PASST_SRCS) $(QRAP_SRCS)
> =20
> diff --git a/conf.c b/conf.c
> index 1537dbf..ba1d8de 100644
> --- a/conf.c
> +++ b/conf.c
> @@ -40,6 +40,7 @@
>  #include "pasta.h"
>  #include "lineread.h"
>  #include "isolation.h"
> +#include "log.h"
> =20
>  /**
>   * get_bound_ports() - Get maps of ports with bound sockets
> diff --git a/dhcp.c b/dhcp.c
> index 7ad1319..7f0cc0b 100644
> --- a/dhcp.c
> +++ b/dhcp.c
> @@ -29,6 +29,7 @@
>  #include "packet.h"
>  #include "passt.h"
>  #include "tap.h"
> +#include "log.h"
>  #include "dhcp.h"
> =20
>  /**
> diff --git a/dhcpv6.c b/dhcpv6.c
> index 8a1d4a6..e7640ce 100644
> --- a/dhcpv6.c
> +++ b/dhcpv6.c
> @@ -30,6 +30,7 @@
>  #include "util.h"
>  #include "passt.h"
>  #include "tap.h"
> +#include "log.h"
> =20
>  /**
>   * struct opt_hdr - DHCPv6 option header
> diff --git a/icmp.c b/icmp.c
> index 29170aa..f02f89f 100644
> --- a/icmp.c
> +++ b/icmp.c
> @@ -35,6 +35,7 @@
>  #include "util.h"
>  #include "passt.h"
>  #include "tap.h"
> +#include "log.h"
>  #include "icmp.h"
> =20
>  #define ICMP_ECHO_TIMEOUT	60 /* s, timeout for ICMP socket activity */
> diff --git a/isolation.c b/isolation.c
> index 124dea4..b54c325 100644
> --- a/isolation.c
> +++ b/isolation.c
> @@ -42,6 +42,7 @@
>  #include "util.h"
>  #include "seccomp.h"
>  #include "passt.h"
> +#include "log.h"
>  #include "isolation.h"
> =20
>  /**
> diff --git a/log.c b/log.c
> new file mode 100644
> index 0000000..54a7cbb
> --- /dev/null
> +++ b/log.c
> @@ -0,0 +1,143 @@
> +// SPDX-License-Identifier: AGPL-3.0-or-later
> +
> +/* PASST - Plug A Simple Socket Transport
> + *  for qemu/UNIX domain socket mode
> + *
> + * PASTA - Pack A Subtle Tap Abstraction
> + *  for network namespace/tap device mode
> + *
> + * log.c - Logging functions
> + *
> + * Copyright (c) 2020-2022 Red Hat GmbH
> + * Author: Stefano Brivio <sbrivio(a)redhat.com>
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <unistd.h>
> +#include <string.h>
> +#include <time.h>
> +#include <syslog.h>
> +#include <stdarg.h>
> +#include <sys/socket.h>
> +#include <sys/un.h>
> +
> +#include "log.h"
> +
> +/* For __openlog() and __setlogmask() wrappers, and passt_vsyslog() */
> +static int	log_mask;
> +static int	log_sock =3D -1;
> +static char	log_ident[BUFSIZ];
> +static int	log_opt;
> +static time_t	log_debug_start;
> +int		log_trace;
> +
> +#define logfn(name, level)						\
> +void name(const char *format, ...) {					\
> +	struct timespec tp;						\
> +	va_list args;							\
> +									\
> +	if (setlogmask(0) & LOG_MASK(LOG_DEBUG)) {			\
> +		clock_gettime(CLOCK_REALTIME, &tp);			\
> +		fprintf(stderr, "%li.%04li: ",				\
> +			tp.tv_sec - log_debug_start,			\
> +			tp.tv_nsec / (100L * 1000));			\
> +	} else {							\
> +		va_start(args, format);					\
> +		passt_vsyslog(level, format, args);			\
> +		va_end(args);						\
> +	}								\
> +									\
> +	if (setlogmask(0) & LOG_MASK(LOG_DEBUG) ||			\
> +	    setlogmask(0) =3D=3D LOG_MASK(LOG_EMERG)) {			\
> +		va_start(args, format);					\
> +		(void)vfprintf(stderr, format, args); 			\
> +		va_end(args);						\
> +		if (format[strlen(format)] !=3D '\n')			\
> +			fprintf(stderr, "\n");				\
> +	}								\
> +}
> +
> +logfn(err,   LOG_ERR)
> +logfn(warn,  LOG_WARNING)
> +logfn(info,  LOG_INFO)
> +logfn(debug, LOG_DEBUG)
> +
> +void trace_init(int enable)
> +{
> +	log_trace =3D enable;
> +}
> +
> +/**
> + * __openlog() - Non-optional openlog() wrapper, to allow custom vsyslog()
> + * @ident:	openlog() identity (program name)
> + * @option:	openlog() options
> + * @facility:	openlog() facility (LOG_DAEMON)
> + */
> +void __openlog(const char *ident, int option, int facility)
> +{
> +	struct timespec tp;
> +
> +	clock_gettime(CLOCK_REALTIME, &tp);
> +	log_debug_start =3D tp.tv_sec;
> +
> +	if (log_sock < 0) {
> +		struct sockaddr_un a =3D { .sun_family =3D AF_UNIX, };
> +
> +		log_sock =3D socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
> +		if (log_sock < 0)
> +			return;
> +
> +		strncpy(a.sun_path, _PATH_LOG, sizeof(a.sun_path));
> +		if (connect(log_sock, (const struct sockaddr *)&a, sizeof(a))) {
> +			close(log_sock);
> +			log_sock =3D -1;
> +			return;
> +		}
> +	}
> +
> +	log_mask |=3D facility;
> +	strncpy(log_ident, ident, sizeof(log_ident) - 1);
> +	log_opt =3D option;
> +
> +	openlog(ident, option, facility);
> +}
> +
> +/**
> + * __setlogmask() - setlogmask() wrapper, to allow custom vsyslog()
> + * @mask:	Same as setlogmask() mask
> + */
> +void __setlogmask(int mask)
> +{
> +	log_mask =3D mask;
> +	setlogmask(mask);
> +}
> +
> +/**
> + * passt_vsyslog() - vsyslog() implementation not using heap memory
> + * @pri:	Facility and level map, same as priority for vsyslog()
> + * @format:	Same as vsyslog() format
> + * @ap:		Same as vsyslog() ap
> + */
> +void passt_vsyslog(int pri, const char *format, va_list ap)
> +{
> +	char buf[BUFSIZ];
> +	int n;
> +
> +	if (!(LOG_MASK(LOG_PRI(pri)) & log_mask))
> +		return;
> +
> +	/* Send without name and timestamp, the system logger should add them */
> +	n =3D snprintf(buf, BUFSIZ, "<%i> ", pri);
> +
> +	n +=3D vsnprintf(buf + n, BUFSIZ - n, format, ap);
> +
> +	if (format[strlen(format)] !=3D '\n')
> +		n +=3D snprintf(buf + n, BUFSIZ - n, "\n");
> +
> +	if (log_opt & LOG_PERROR)
> +		fprintf(stderr, "%s", buf + sizeof("<0>"));
> +
> +	if (send(log_sock, buf, n, 0) !=3D n)
> +		fprintf(stderr, "Failed to send %i bytes to syslog\n", n);
> +}
> diff --git a/log.h b/log.h
> new file mode 100644
> index 0000000..70cad6f
> --- /dev/null
> +++ b/log.h
> @@ -0,0 +1,26 @@
> +/* SPDX-License-Identifier: AGPL-3.0-or-later
> + * Copyright (c) 2022 Red Hat GmbH
> + * Author: Stefano Brivio <sbrivio(a)redhat.com>
> + */
> +
> +#ifndef LOG_H
> +#define LOG_H
> +
> +void err(const char *format, ...);
> +void warn(const char *format, ...);
> +void info(const char *format, ...);
> +void debug(const char *format, ...);
> +
> +extern int log_trace;
> +void trace_init(int enable);
> +#define trace(format, ...)						\
> +	do {								\
> +		if (log_trace)						\
> +			debug(format, ##__VA_ARGS__);			\
> +	} while (0)
> +
> +void __openlog(const char *ident, int option, int facility);
> +void passt_vsyslog(int pri, const char *format, va_list ap);
> +void __setlogmask(int mask);
> +
> +#endif /* LOG_H */
> diff --git a/ndp.c b/ndp.c
> index 29c4b14..dec36a9 100644
> --- a/ndp.c
> +++ b/ndp.c
> @@ -30,6 +30,7 @@
>  #include "util.h"
>  #include "passt.h"
>  #include "tap.h"
> +#include "log.h"
> =20
>  #define RS	133
>  #define RA	134
> diff --git a/netlink.c b/netlink.c
> index 15ce213..9719e91 100644
> --- a/netlink.c
> +++ b/netlink.c
> @@ -30,6 +30,7 @@
> =20
>  #include "util.h"
>  #include "passt.h"
> +#include "log.h"
>  #include "netlink.h"
> =20
>  /* Socket in init, in target namespace, sequence (just needs to be monoton=
ic) */
> diff --git a/packet.c b/packet.c
> index 6d10ec1..3f82e84 100644
> --- a/packet.c
> +++ b/packet.c
> @@ -20,6 +20,7 @@
> =20
>  #include "packet.h"
>  #include "util.h"
> +#include "log.h"
> =20
>  /**
>   * packet_add_do() - Add data as packet descriptor to given pool
> diff --git a/passt.c b/passt.c
> index 2c4a986..0c561b2 100644
> --- a/passt.c
> +++ b/passt.c
> @@ -44,6 +44,7 @@
>  #include "conf.h"
>  #include "pasta.h"
>  #include "arch.h"
> +#include "log.h"
> =20
>  #define EPOLL_EVENTS		8
> =20
> diff --git a/pasta.c b/pasta.c
> index 1dd8267..1887dd2 100644
> --- a/pasta.c
> +++ b/pasta.c
> @@ -44,6 +44,7 @@
>  #include "passt.h"
>  #include "isolation.h"
>  #include "netlink.h"
> +#include "log.h"
> =20
>  /* PID of child, in case we created a namespace */
>  static int pasta_child_pid;
> diff --git a/pcap.c b/pcap.c
> index 7a48baf..836688d 100644
> --- a/pcap.c
> +++ b/pcap.c
> @@ -30,6 +30,7 @@
> =20
>  #include "util.h"
>  #include "passt.h"
> +#include "log.h"
> =20
>  #define PCAP_VERSION_MINOR 4
> =20
> diff --git a/tap.c b/tap.c
> index 5540c18..bdcc161 100644
> --- a/tap.c
> +++ b/tap.c
> @@ -52,6 +52,7 @@
>  #include "netlink.h"
>  #include "pasta.h"
>  #include "packet.h"
> +#include "log.h"
> =20
>  /* IPv4 (plus ARP) and IPv6 message batches from tap/guest to IP handlers =
*/
>  static PACKET_POOL_NOINIT(pool_tap4, TAP_MSGS, pkt_buf);
> diff --git a/tcp.c b/tcp.c
> index 8ec991c..830dc88 100644
> --- a/tcp.c
> +++ b/tcp.c
> @@ -298,6 +298,7 @@
>  #include "pcap.h"
>  #include "conf.h"
>  #include "tcp_splice.h"
> +#include "log.h"
> =20
>  #define TCP_FRAMES_MEM			128
>  #define TCP_FRAMES							\
> diff --git a/tcp_splice.c b/tcp_splice.c
> index edbcfd4..4a015d0 100644
> --- a/tcp_splice.c
> +++ b/tcp_splice.c
> @@ -47,6 +47,7 @@
> =20
>  #include "util.h"
>  #include "passt.h"
> +#include "log.h"
> =20
>  #define MAX_PIPE_SIZE			(8UL * 1024 * 1024)
>  #define TCP_SPLICE_MAX_CONNS		(128 * 1024)
> diff --git a/udp.c b/udp.c
> index d1be622..5422fdd 100644
> --- a/udp.c
> +++ b/udp.c
> @@ -116,6 +116,7 @@
>  #include "passt.h"
>  #include "tap.h"
>  #include "pcap.h"
> +#include "log.h"
> =20
>  #define UDP_CONN_TIMEOUT	180 /* s, timeout for ephemeral or local bind */
>  #define UDP_SPLICE_FRAMES	32
> diff --git a/util.c b/util.c
> index 6b86ead..b366167 100644
> --- a/util.c
> +++ b/util.c
> @@ -19,8 +19,6 @@
>  #include <net/ethernet.h>
>  #include <sys/epoll.h>
>  #include <fcntl.h>
> -#include <syslog.h>
> -#include <stdarg.h>
>  #include <string.h>
>  #include <time.h>
>  #include <errno.h>
> @@ -29,124 +27,7 @@
>  #include "passt.h"
>  #include "packet.h"
>  #include "lineread.h"
> -
> -/* For __openlog() and __setlogmask() wrappers, and passt_vsyslog() */
> -static int	log_mask;
> -static int	log_sock =3D -1;
> -static char	log_ident[BUFSIZ];
> -static int	log_opt;
> -static time_t	log_debug_start;
> -int		log_trace;
> -
> -#define logfn(name, level)						\
> -void name(const char *format, ...) {					\
> -	struct timespec tp;						\
> -	va_list args;							\
> -									\
> -	if (setlogmask(0) & LOG_MASK(LOG_DEBUG)) {			\
> -		clock_gettime(CLOCK_REALTIME, &tp);			\
> -		fprintf(stderr, "%li.%04li: ",				\
> -			tp.tv_sec - log_debug_start,			\
> -			tp.tv_nsec / (100L * 1000));			\
> -	} else {							\
> -		va_start(args, format);					\
> -		passt_vsyslog(level, format, args);			\
> -		va_end(args);						\
> -	}								\
> -									\
> -	if (setlogmask(0) & LOG_MASK(LOG_DEBUG) ||			\
> -	    setlogmask(0) =3D=3D LOG_MASK(LOG_EMERG)) {			\
> -		va_start(args, format);					\
> -		(void)vfprintf(stderr, format, args); 			\
> -		va_end(args);						\
> -		if (format[strlen(format)] !=3D '\n')			\
> -			fprintf(stderr, "\n");				\
> -	}								\
> -}
> -
> -logfn(err,   LOG_ERR)
> -logfn(warn,  LOG_WARNING)
> -logfn(info,  LOG_INFO)
> -logfn(debug, LOG_DEBUG)
> -
> -void trace_init(int enable)
> -{
> -	log_trace =3D enable;
> -}
> -
> -/**
> - * __openlog() - Non-optional openlog() wrapper, to allow custom vsyslog()
> - * @ident:	openlog() identity (program name)
> - * @option:	openlog() options
> - * @facility:	openlog() facility (LOG_DAEMON)
> - */
> -void __openlog(const char *ident, int option, int facility)
> -{
> -	struct timespec tp;
> -
> -	clock_gettime(CLOCK_REALTIME, &tp);
> -	log_debug_start =3D tp.tv_sec;
> -
> -	if (log_sock < 0) {
> -		struct sockaddr_un a =3D { .sun_family =3D AF_UNIX, };
> -
> -		log_sock =3D socket(AF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC, 0);
> -		if (log_sock < 0)
> -			return;
> -
> -		strncpy(a.sun_path, _PATH_LOG, sizeof(a.sun_path));
> -		if (connect(log_sock, (const struct sockaddr *)&a, sizeof(a))) {
> -			close(log_sock);
> -			log_sock =3D -1;
> -			return;
> -		}
> -	}
> -
> -	log_mask |=3D facility;
> -	strncpy(log_ident, ident, sizeof(log_ident) - 1);
> -	log_opt =3D option;
> -
> -	openlog(ident, option, facility);
> -}
> -
> -/**
> - * __setlogmask() - setlogmask() wrapper, to allow custom vsyslog()
> - * @mask:	Same as setlogmask() mask
> - */
> -void __setlogmask(int mask)
> -{
> -	log_mask =3D mask;
> -	setlogmask(mask);
> -}
> -
> -/**
> - * passt_vsyslog() - vsyslog() implementation not using heap memory
> - * @pri:	Facility and level map, same as priority for vsyslog()
> - * @format:	Same as vsyslog() format
> - * @ap:		Same as vsyslog() ap
> - */
> -void passt_vsyslog(int pri, const char *format, va_list ap)
> -{
> -	char buf[BUFSIZ];
> -	int n;
> -
> -	if (!(LOG_MASK(LOG_PRI(pri)) & log_mask))
> -		return;
> -
> -	/* Send without name and timestamp, the system logger should add them */
> -	n =3D snprintf(buf, BUFSIZ, "<%i> ", pri);
> -
> -	n +=3D vsnprintf(buf + n, BUFSIZ - n, format, ap);
> -
> -	if (format[strlen(format)] !=3D '\n')
> -		n +=3D snprintf(buf + n, BUFSIZ - n, "\n");
> -
> -	if (log_opt & LOG_PERROR)
> -		fprintf(stderr, "%s", buf + sizeof("<0>"));
> -
> -	if (send(log_sock, buf, n, 0) !=3D n)
> -		fprintf(stderr, "Failed to send %i bytes to syslog\n", n);
> -}
> +#include "log.h"
> =20
>  #define IPV6_NH_OPT(nh)							\
>  	((nh) =3D=3D 0   || (nh) =3D=3D 43  || (nh) =3D=3D 44  || (nh) =3D=3D 50 =
 ||	\
> diff --git a/util.h b/util.h
> index 0c06e34..1adbf04 100644
> --- a/util.h
> +++ b/util.h
> @@ -6,19 +6,6 @@
>  #ifndef UTIL_H
>  #define UTIL_H
> =20
> -void err(const char *format, ...);
> -void warn(const char *format, ...);
> -void info(const char *format, ...);
> -void debug(const char *format, ...);
> -
> -extern int log_trace;
> -void trace_init(int enable);
> -#define trace(format, ...)						\
> -	do {								\
> -		if (log_trace)						\
> -			debug(format, ##__VA_ARGS__);			\
> -	} while (0)
> -
>  #ifndef SECCOMP_RET_KILL_PROCESS
>  #define SECCOMP_RET_KILL_PROCESS	SECCOMP_RET_KILL
>  #endif
> @@ -196,9 +183,6 @@ struct ipv6_opt_hdr {
> =20
>  /* cppcheck-suppress funcArgNamesDifferent */
>  __attribute__ ((weak)) int ffsl(long int i) { return __builtin_ffsl(i); }
> -void __openlog(const char *ident, int option, int facility);
> -void passt_vsyslog(int pri, const char *format, va_list ap);
> -void __setlogmask(int mask);
>  char *ipv6_l4hdr(const struct pool *p, int index, size_t offset, uint8_t *=
proto,
>  		 size_t *dlen);
>  int sock_l4(const struct ctx *c, int af, uint8_t proto,

--=20
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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