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-rw-r--r--Makefile14
-rw-r--r--passt.c13
-rw-r--r--pasta.c15
-rw-r--r--pcap.c35
-rw-r--r--siphash.c3
-rw-r--r--tcp.c36
-rw-r--r--udp.c8
7 files changed, 91 insertions, 33 deletions
diff --git a/Makefile b/Makefile
index c2077f2..6d11e22 100644
--- a/Makefile
+++ b/Makefile
@@ -15,6 +15,20 @@ CFLAGS += -DPAGE_SIZE=$(shell getconf PAGE_SIZE)
CFLAGS += -DNETNS_RUN_DIR=\"/run/netns\"
CFLAGS += -DPASST_AUDIT_ARCH=AUDIT_ARCH_$(shell uname -m | tr [a-z] [A-Z])
+# On gcc 11.2, with -O2 and -flto, tcp_hash() and siphash_20b(), if inlined,
+# seem to be hitting something similar to:
+# https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78993
+# from the pointer arithmetic used from the tcp_tap_handler() path to get the
+# remote connection address.
+ifeq ($(shell $(CC) -dumpversion),11)
+ifneq (,$(filter -flto%,$(CFLAGS)))
+ifneq (,$(filter -O2,$(CFLAGS)))
+ CFLAGS += -DTCP_HASH_NOINLINE
+ CFLAGS += -DSIPHASH_20B_NOINLINE
+endif
+endif
+endif
+
prefix ?= /usr/local
all: passt pasta passt4netns qrap
diff --git a/passt.c b/passt.c
index a5f9bf8..846ba7f 100644
--- a/passt.c
+++ b/passt.c
@@ -257,13 +257,16 @@ static void pid_file(struct ctx *c) {
if (!*c->pid_file)
return;
- pid_fd = open(c->pid_file, O_CREAT | O_WRONLY);
+ pid_fd = open(c->pid_file, O_CREAT | O_WRONLY, S_IRUSR | S_IWUSR);
if (pid_fd < 0)
return;
n = snprintf(pid_buf, sizeof(pid_buf), "%i\n", getpid());
- write(pid_fd, pid_buf, n);
+ if (write(pid_fd, pid_buf, n) < 0) {
+ perror("PID file write");
+ exit(EXIT_FAILURE);
+ }
close(pid_fd);
}
@@ -365,8 +368,10 @@ int main(int argc, char **argv)
else
__setlogmask(LOG_UPTO(LOG_INFO));
- if (isatty(fileno(stdout)) && !c.foreground)
- daemon(0, 0);
+ if (isatty(fileno(stdout)) && !c.foreground && daemon(0, 0)) {
+ perror("daemon");
+ exit(EXIT_FAILURE);
+ }
pid_file(&c);
diff --git a/pasta.c b/pasta.c
index fe0bf0e..395f459 100644
--- a/pasta.c
+++ b/pasta.c
@@ -184,7 +184,8 @@ void pasta_start_ns(struct ctx *c)
snprintf(proc_path, PATH_MAX, "/proc/%i/ns/net",
pasta_child_pid);
- readlink(proc_path, pasta_child_ns, PATH_MAX);
+ if (readlink(proc_path, pasta_child_ns, PATH_MAX) < 0)
+ warn("Cannot read link to ns, won't clean up on exit");
return;
}
@@ -198,20 +199,24 @@ void pasta_start_ns(struct ctx *c)
snprintf(buf, BUFSIZ, "%u %u %u", 0, euid, 1);
fd = open("/proc/self/uid_map", O_WRONLY);
- write(fd, buf, strlen(buf));
+ if (write(fd, buf, strlen(buf)) < 0)
+ warn("Cannot set uid_map in namespace");
close(fd);
fd = open("/proc/self/setgroups", O_WRONLY);
- write(fd, "deny", sizeof("deny"));
+ if (write(fd, "deny", sizeof("deny")))
+ warn("Cannot write to setgroups in namespace");
close(fd);
fd = open("/proc/self/gid_map", O_WRONLY);
- write(fd, buf, strlen(buf));
+ if (write(fd, buf, strlen(buf)) < 0)
+ warn("Cannot set gid_map in namespace");
close(fd);
}
fd = open("/proc/sys/net/ipv4/ping_group_range", O_WRONLY);
- write(fd, "0 0", strlen("0 0"));
+ if (write(fd, "0 0", strlen("0 0")) < 0)
+ warn("Cannot set ping_group_range, ICMP requests might fail");
close(fd);
shell = getenv("SHELL") ? getenv("SHELL") : "/bin/sh";
diff --git a/pcap.c b/pcap.c
index 9cf585f..8ff1636 100644
--- a/pcap.c
+++ b/pcap.c
@@ -23,6 +23,7 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <time.h>
+#include <errno.h>
#include <net/ethernet.h>
#include <netinet/in.h>
#include <unistd.h>
@@ -87,8 +88,8 @@ void pcap(char *pkt, size_t len)
h.tv_usec = tv.tv_usec;
h.caplen = h.len = len;
- write(pcap_fd, &h, sizeof(h));
- write(pcap_fd, pkt, len);
+ if (write(pcap_fd, &h, sizeof(h)) < 0 || write(pcap_fd, pkt, len) < 0)
+ debug("Cannot log packet, length %u", len);
}
/**
@@ -98,6 +99,7 @@ void pcap(char *pkt, size_t len)
void pcapm(struct msghdr *mh)
{
struct pcap_pkthdr h;
+ struct iovec *iov;
struct timeval tv;
unsigned int i;
@@ -109,13 +111,19 @@ void pcapm(struct msghdr *mh)
h.tv_usec = tv.tv_usec;
for (i = 0; i < mh->msg_iovlen; i++) {
- struct iovec *iov = &mh->msg_iov[i];
+ iov = &mh->msg_iov[i];
h.caplen = h.len = iov->iov_len - 4;
- write(pcap_fd, &h, sizeof(h));
- write(pcap_fd, (char *)iov->iov_base + 4, iov->iov_len - 4);
+ if (write(pcap_fd, &h, sizeof(h)) < 0)
+ goto fail;
+ if (write(pcap_fd, (char *)iov->iov_base + 4, iov->iov_len - 4))
+ goto fail;
}
+
+ return;
+fail:
+ debug("Cannot log packet, length %u", iov->iov_len - 4);
}
/**
@@ -125,6 +133,7 @@ void pcapm(struct msghdr *mh)
void pcapmm(struct mmsghdr *mmh, unsigned int vlen)
{
struct pcap_pkthdr h;
+ struct iovec *iov;
struct timeval tv;
unsigned int i, j;
@@ -139,15 +148,20 @@ void pcapmm(struct mmsghdr *mmh, unsigned int vlen)
struct msghdr *mh = &mmh[i].msg_hdr;
for (j = 0; j < mh->msg_iovlen; j++) {
- struct iovec *iov = &mh->msg_iov[j];
+ iov = &mh->msg_iov[j];
h.caplen = h.len = iov->iov_len - 4;
- write(pcap_fd, &h, sizeof(h));
- write(pcap_fd, (char *)iov->iov_base + 4,
- iov->iov_len - 4);
+ if (write(pcap_fd, &h, sizeof(h)) < 0)
+ goto fail;
+ if (write(pcap_fd, (char *)iov->iov_base + 4,
+ iov->iov_len - 4) < 0)
+ goto fail;
}
}
+ return;
+fail:
+ debug("Cannot log packet, length %u", iov->iov_len - 4);
}
/**
@@ -194,5 +208,6 @@ void pcap_init(struct ctx *c, int index)
info("Saving packet capture at %s", c->pcap);
- write(pcap_fd, &pcap_hdr, sizeof(pcap_hdr));
+ if (write(pcap_fd, &pcap_hdr, sizeof(pcap_hdr)) < 0)
+ warn("Cannot write PCAP header: %s", strerror(errno));
}
diff --git a/siphash.c b/siphash.c
index b7a7861..88f8bd2 100644
--- a/siphash.c
+++ b/siphash.c
@@ -146,6 +146,9 @@ uint32_t siphash_12b(const uint8_t *in, const uint64_t *k)
*
* Return: the 64-bit hash output
*/
+#if SIPHASH_20B_NOINLINE
+__attribute__((__noinline__)) /* See comment in Makefile */
+#endif
uint64_t siphash_20b(const uint8_t *in, const uint64_t *k)
{
uint32_t *in32 = (uint32_t *)in;
diff --git a/tcp.c b/tcp.c
index 0093ec4..99674ef 100644
--- a/tcp.c
+++ b/tcp.c
@@ -311,6 +311,7 @@
#include <sched.h>
#include <fcntl.h>
#include <stdio.h>
+#include <stdlib.h>
#include <errno.h>
#include <limits.h>
#include <net/ethernet.h>
@@ -1103,6 +1104,9 @@ static int tcp_hash_match(struct tcp_tap_conn *conn, int af, void *addr,
*
* Return: hash value, already modulo size of the hash table
*/
+#if TCP_HASH_NOINLINE
+__attribute__((__noinline__)) /* See comment in Makefile */
+#endif
static unsigned int tcp_hash(struct ctx *c, int af, void *addr,
in_port_t tap_port, in_port_t sock_port)
{
@@ -1322,8 +1326,9 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
for (i = 0; i < mh.msg_iovlen; i++) {
struct iovec *iov = &mh.msg_iov[i];
- write(c->fd_tap, (char *)iov->iov_base + 4,
- iov->iov_len - 4);
+ if (write(c->fd_tap, (char *)iov->iov_base + 4,
+ iov->iov_len - 4) < 0)
+ debug("tap write: %s", strerror(errno));
}
}
tcp6_l2_flags_buf_used = 0;
@@ -1338,8 +1343,9 @@ static void tcp_l2_flags_buf_flush(struct ctx *c)
for (i = 0; i < mh.msg_iovlen; i++) {
struct iovec *iov = &mh.msg_iov[i];
- write(c->fd_tap, (char *)iov->iov_base + 4,
- iov->iov_len - 4);
+ if (write(c->fd_tap, (char *)iov->iov_base + 4,
+ iov->iov_len - 4) < 0)
+ debug("tap write: %s", strerror(errno));
}
}
tcp4_l2_flags_buf_used = 0;
@@ -1392,8 +1398,9 @@ static void tcp_l2_buf_flush(struct ctx *c)
for (i = 0; i < mh.msg_iovlen; i++) {
struct iovec *iov = &mh.msg_iov[i];
- write(c->fd_tap, (char *)iov->iov_base + 4,
- iov->iov_len - 4);
+ if (write(c->fd_tap, (char *)iov->iov_base + 4,
+ iov->iov_len - 4) < 0)
+ debug("tap write: %s", strerror(errno));
}
}
tcp6_l2_buf_used = tcp6_l2_buf_bytes = 0;
@@ -1413,8 +1420,9 @@ v4:
for (i = 0; i < mh.msg_iovlen; i++) {
struct iovec *iov = &mh.msg_iov[i];
- write(c->fd_tap, (char *)iov->iov_base + 4,
- iov->iov_len - 4);
+ if (write(c->fd_tap, (char *)iov->iov_base + 4,
+ iov->iov_len - 4) < 0)
+ debug("tap write: %s", strerror(errno));
}
}
tcp4_l2_buf_used = tcp4_l2_buf_bytes = 0;
@@ -1628,14 +1636,16 @@ static int tcp_send_to_tap(struct ctx *c, struct tcp_tap_conn *conn, int flags,
iov = tcp4_l2_flags_iov_tap + tcp4_l2_flags_buf_used;
p = b4 = tcp4_l2_flags_buf + tcp4_l2_flags_buf_used++;
th = &b4->th;
+
+ /* gcc 11.2 would complain on data = (char *)(th + 1); */
+ data = b4->opts;
} else {
iov = tcp6_l2_flags_iov_tap + tcp6_l2_flags_buf_used;
p = b6 = tcp6_l2_flags_buf + tcp6_l2_flags_buf_used++;
th = &b6->th;
+ data = b6->opts;
}
- data = (char *)(th + 1);
-
if (flags & SYN) {
uint16_t mss;
@@ -3538,7 +3548,11 @@ int tcp_sock_init(struct ctx *c, struct timespec *now)
in_port_t port;
int i;
- getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret), GRND_RANDOM);
+ if (getrandom(&c->tcp.hash_secret, sizeof(c->tcp.hash_secret),
+ GRND_RANDOM) < 0) {
+ perror("TCP initial sequence getrandom");
+ exit(EXIT_FAILURE);
+ }
for (port = 0; port < USHRT_MAX; port++) {
if (!bitmap_isset(c->tcp.port_to_tap, port))
diff --git a/udp.c b/udp.c
index ceb10a6..5c0e955 100644
--- a/udp.c
+++ b/udp.c
@@ -536,8 +536,8 @@ static void udp_sock_handler_splice(struct ctx *c, union epoll_ref ref,
uint32_t events, struct timespec *now)
{
struct msghdr *mh = &udp_splice_mmh_recv[0].msg_hdr;
+ in_port_t src, dst = ref.udp.port, send_dst = 0;
struct sockaddr_storage *sa_s = mh->msg_name;
- in_port_t src, dst = ref.udp.port, send_dst;
int s, v6 = ref.udp.v6, n, i;
if (!(events & EPOLLIN))
@@ -721,7 +721,8 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
if (c->mode == MODE_PASTA) {
ip_len += sizeof(struct ethhdr);
- write(c->fd_tap, &b->eh, ip_len);
+ if (write(c->fd_tap, &b->eh, ip_len) < 0)
+ debug("tap write: %s", strerror(errno));
pcap((char *)&b->eh, ip_len);
continue;
}
@@ -791,7 +792,8 @@ void udp_sock_handler(struct ctx *c, union epoll_ref ref, uint32_t events,
if (c->mode == MODE_PASTA) {
ip_len += sizeof(struct ethhdr);
- write(c->fd_tap, &b->eh, ip_len);
+ if (write(c->fd_tap, &b->eh, ip_len) < 0)
+ debug("tap write: %s", strerror(errno));
pcap((char *)&b->eh, ip_len);
continue;
}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-24 17:47:41 +0000