We use fprintf() to print to standard output or standard error
streams. If something gets truncated or there's an output error, we
don't really want to try and report that, and at the same time it's
not abnormal behaviour upon which we should terminate, either.
Just silence the warning with an ugly FPRINTF() variadic macro casting
the fprintf() expressions to void.
Signed-off-by: Stefano Brivio <sbrivio(a)redhat.com>
Reviewed-by: David Gibson <david(a)gibson.dropbear.id.au>
---
conf.c | 46 +++++++++++++++++++++++-----------------------
log.c | 6 +++---
util.h | 3 +++
3 files changed, 29 insertions(+), 26 deletions(-)
diff --git a/conf.c b/conf.c
index fa5cec3..4db7c64 100644
--- a/conf.c
+++ b/conf.c
@@ -733,19 +733,19 @@ static unsigned int conf_ip6(unsigned int ifi, struct ip6_ctx *ip6)
static void usage(const char *name, FILE *f, int status)
{
if (strstr(name, "pasta")) {
- fprintf(f, "Usage: %s [OPTION]... [COMMAND] [ARGS]...\n", name);
- fprintf(f, " %s [OPTION]... PID\n", name);
- fprintf(f, " %s [OPTION]... --netns [PATH|NAME]\n", name);
- fprintf(f,
+ FPRINTF(f, "Usage: %s [OPTION]... [COMMAND] [ARGS]...\n", name);
+ FPRINTF(f, " %s [OPTION]... PID\n", name);
+ FPRINTF(f, " %s [OPTION]... --netns [PATH|NAME]\n", name);
+ FPRINTF(f,
"\n"
"Without PID or --netns, run the given command or a\n"
"default shell in a new network and user namespace, and\n"
"connect it via pasta.\n");
} else {
- fprintf(f, "Usage: %s [OPTION]...\n", name);
+ FPRINTF(f, "Usage: %s [OPTION]...\n", name);
}
- fprintf(f,
+ FPRINTF(f,
"\n"
" -d, --debug Be verbose\n"
" --trace Be extra verbose, implies --debug\n"
@@ -762,17 +762,17 @@ static void usage(const char *name, FILE *f, int status)
" --version Show version and exit\n");
if (strstr(name, "pasta")) {
- fprintf(f,
+ FPRINTF(f,
" -I, --ns-ifname NAME namespace interface name\n"
" default: same interface name as external one\n");
} else {
- fprintf(f,
+ FPRINTF(f,
" -s, --socket PATH UNIX domain socket path\n"
" default: probe free path starting from "
UNIX_SOCK_PATH "\n", 1);
}
- fprintf(f,
+ FPRINTF(f,
" -F, --fd FD Use FD as pre-opened connected socket\n"
" -p, --pcap FILE Log tap-facing traffic to pcap file\n"
" -P, --pid FILE Write own PID to the given file\n"
@@ -803,28 +803,28 @@ static void usage(const char *name, FILE *f, int status)
" can be specified multiple times\n"
" a single, empty option disables DNS information\n");
if (strstr(name, "pasta"))
- fprintf(f, " default: don't use any addresses\n");
+ FPRINTF(f, " default: don't use any addresses\n");
else
- fprintf(f, " default: use addresses from /etc/resolv.conf\n");
- fprintf(f,
+ FPRINTF(f, " default: use addresses from /etc/resolv.conf\n");
+ FPRINTF(f,
" -S, --search LIST Space-separated list, search domains\n"
" a single, empty option disables the DNS search list\n");
if (strstr(name, "pasta"))
- fprintf(f, " default: don't use any search list\n");
+ FPRINTF(f, " default: don't use any search list\n");
else
- fprintf(f, " default: use search list from /etc/resolv.conf\n");
+ FPRINTF(f, " default: use search list from /etc/resolv.conf\n");
if (strstr(name, "pasta"))
- fprintf(f, " --dhcp-dns \tPass DNS list via DHCP/DHCPv6/NDP\n");
+ FPRINTF(f, " --dhcp-dns \tPass DNS list via DHCP/DHCPv6/NDP\n");
else
- fprintf(f, " --no-dhcp-dns No DNS list in DHCP/DHCPv6/NDP\n");
+ FPRINTF(f, " --no-dhcp-dns No DNS list in DHCP/DHCPv6/NDP\n");
if (strstr(name, "pasta"))
- fprintf(f, " --dhcp-search Pass list via DHCP/DHCPv6/NDP\n");
+ FPRINTF(f, " --dhcp-search Pass list via DHCP/DHCPv6/NDP\n");
else
- fprintf(f, " --no-dhcp-search No list in DHCP/DHCPv6/NDP\n");
+ FPRINTF(f, " --no-dhcp-search No list in DHCP/DHCPv6/NDP\n");
- fprintf(f,
+ FPRINTF(f,
" --map-host-loopback ADDR Translate ADDR to refer to host\n"
" can be specified zero to two times (for IPv4 and IPv6)\n"
" default: gateway address\n"
@@ -852,7 +852,7 @@ static void usage(const char *name, FILE *f, int status)
if (strstr(name, "pasta"))
goto pasta_opts;
- fprintf(f,
+ FPRINTF(f,
" -1, --one-off Quit after handling one single client\n"
" -t, --tcp-ports SPEC TCP port forwarding to guest\n"
" can be specified multiple times\n"
@@ -883,7 +883,7 @@ static void usage(const char *name, FILE *f, int status)
pasta_opts:
- fprintf(f,
+ FPRINTF(f,
" -t, --tcp-ports SPEC TCP port forwarding to namespace\n"
" can be specified multiple times\n"
" SPEC can be:\n"
@@ -1421,9 +1421,9 @@ void conf(struct ctx *c, int argc, char **argv)
break;
case 14:
- fprintf(stdout,
+ FPRINTF(stdout,
c->mode == MODE_PASTA ? "pasta " : "passt ");
- fprintf(stdout, VERSION_BLOB);
+ FPRINTF(stdout, VERSION_BLOB);
exit(EXIT_SUCCESS);
case 15:
ret = snprintf(c->ip4.ifname_out,
diff --git a/log.c b/log.c
index a61468e..6932885 100644
--- a/log.c
+++ b/log.c
@@ -274,7 +274,7 @@ void vlogmsg(bool newline, bool cont, int pri, const char *format,
va_list ap)
char timestr[LOGTIME_STRLEN];
logtime_fmt(timestr, sizeof(timestr), now);
- fprintf(stderr, "%s: ", timestr);
+ FPRINTF(stderr, "%s: ", timestr);
}
if ((log_mask & LOG_MASK(LOG_PRI(pri))) || !log_conf_parsed) {
@@ -293,7 +293,7 @@ void vlogmsg(bool newline, bool cont, int pri, const char *format,
va_list ap)
(log_stderr && (log_mask & LOG_MASK(LOG_PRI(pri))))) {
(void)vfprintf(stderr, format, ap);
if (newline && format[strlen(format)] != '\n')
- fprintf(stderr, "\n");
+ FPRINTF(stderr, "\n");
}
}
@@ -399,7 +399,7 @@ void passt_vsyslog(bool newline, int pri, const char *format, va_list
ap)
n += snprintf(buf + n, BUFSIZ - n, "\n");
if (log_sock >= 0 && send(log_sock, buf, n, 0) != n && log_stderr)
- fprintf(stderr, "Failed to send %i bytes to syslog\n", n);
+ FPRINTF(stderr, "Failed to send %i bytes to syslog\n", n);
}
/**
diff --git a/util.h b/util.h
index 96f178c..4f8b768 100644
--- a/util.h
+++ b/util.h
@@ -269,6 +269,9 @@ static inline bool mod_between(unsigned x, unsigned i, unsigned j,
unsigned m)
return mod_sub(x, i, m) < mod_sub(j, i, m);
}
+/* FPRINTF() intentionally silences cert-err33-c clang-tidy warnings */
+#define FPRINTF(f, ...) (void)fprintf(f, __VA_ARGS__)
+
/*
* Workarounds for https://github.com/llvm/llvm-project/issues/58992
*
--
2.43.0