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passt: Static builds: don't redefine __vsyslog(), skip getpwnam() and initgroups()

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Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
Stefano Brivio 2021-10-16 06:15:05 +02:00
parent 1fd0c9b0e1
commit 2c7d1ce088
5 changed files with 21 additions and 12 deletions
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2
Makefile
View file

@ -11,7 +11,7 @@ all: passt pasta passt4netns qrap
avx2: CFLAGS += -Ofast -mavx2 -ftree-vectorize -funroll-loops
avx2: clean all
static: CFLAGS += -static
static: CFLAGS += -static -DGLIBC_NO_STATIC_NSS
static: clean all
seccomp.h: *.c $(filter-out seccomp.h,$(wildcard *.h))

3
conf.c
View file

@ -293,7 +293,8 @@ static void get_dns(struct ctx *c)
if ((fd = open("/etc/resolv.conf", O_RDONLY)) < 0)
goto out;
while (!(*buf = 0) && line_read(buf, BUFSIZ, fd)) {
*buf = 0;
while (line_read(buf, BUFSIZ, fd)) {
if (!dns_set && strstr(buf, "nameserver ") == buf) {
p = strrchr(buf, ' ');
if (!p)

11
passt.c
View file

@ -212,18 +212,23 @@ static void check_root(void)
close(fd);
fprintf(stderr, "Don't run this as root. Changing to nobody...\n");
#ifndef GLIBC_NO_STATIC_NSS
pw = getpwnam("nobody");
if (!pw) {
perror("getpwnam");
exit(EXIT_FAILURE);
}
if (initgroups(pw->pw_name, pw->pw_gid) ||
setgid(pw->pw_gid) || setuid(pw->pw_uid)) {
if (!initgroups(pw->pw_name, pw->pw_gid) &&
!setgid(pw->pw_gid) && !setuid(pw->pw_uid))
return;
#else
(void)pw;
#endif
fprintf(stderr, "Can't change to user/group nobody, exiting");
exit(EXIT_FAILURE);
}
}
/**
* drop_caps() - Drop capabilities we might have except for CAP_NET_BIND_SERVICE

11
util.c
View file

@ -37,7 +37,7 @@
#include "util.h"
#include "passt.h"
/* For __openlog() and __setlogmask() wrappers, and __vsyslog() (replacement) */
/* For __openlog() and __setlogmask() wrappers, and passt_vsyslog() */
static int log_mask;
static int log_sock = -1;
static char log_ident[BUFSIZ];
@ -56,7 +56,7 @@ void name(const char *format, ...) { \
tp.tv_nsec / (100 * 1000)); \
} else { \
va_start(args, format); \
__vsyslog(level, format, args); \
passt_vsyslog(level, format, args); \
va_end(args); \
} \
\
@ -121,12 +121,12 @@ void __setlogmask(int mask)
}
/**
* __vsyslog() - vsyslog() implementation not using heap memory
* 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 __vsyslog(int pri, const char *format, va_list ap)
void passt_vsyslog(int pri, const char *format, va_list ap)
{
char buf[BUFSIZ];
int n;
@ -389,6 +389,9 @@ char *line_read(char *buf, size_t len, int fd)
p = buf + strlen(buf) + 1;
while (*p == '\n' && strlen(p) && (size_t)(p - buf) < len)
p++;
if (!(nl = strchr(p, '\n')))
return NULL;
*nl = 0;

2
util.h
View file

@ -147,7 +147,7 @@ enum bind_type {
struct ctx;
void __openlog(const char *ident, int option, int facility);
void __vsyslog(int pri, const char *fmt, va_list ap);
void passt_vsyslog(int pri, const char *fmt, va_list ap);
void __setlogmask(int mask);
char *ipv6_l4hdr(struct ipv6hdr *ip6h, uint8_t *proto);
int sock_l4(struct ctx *c, int af, uint8_t proto, uint16_t port,