Merge pull request #94 from ssahani/dev

Allow to set TCP socket options

Author: ssahani

conf/netlogd.conf.in

@@ -2,3 +2,13 @@
 #Address=239.0.0.1:6000
 #Protocol=udp
 #LogFormat=rfc5424
+#StructuredData=
+#UseSysLogStructuredData=no
+#UseSysLogMsgId=no
+#ConnectionRetrySec=30s
+#KeepAlive=
+#KeepAliveTimeSec=
+#KeepAliveIntervalSec=
+#KeepAliveProbes=
+#NoDelay=
+#SendBuffer=

src/netlog/netlog-gperf.gperf

@@ -29,3 +29,5 @@ Network.KeepAlive,                config_parse_bool,                      0, off
 Network.KeepAliveTimeSec,         config_parse_sec,                       0, offsetof(Manager, keep_alive_time)
 Network.KeepAliveIntervalSec,     config_parse_sec,                       0, offsetof(Manager, keep_alive_interval)
 Network.KeepAliveProbes,          config_parse_unsigned,                  0, offsetof(Manager, keep_alive_cnt)
+Network.NoDelay,                  config_parse_bool,                      0, offsetof(Manager, no_delay)
+Network.SendBuffer,               config_parse_iec_size,                  0, offsetof(Manager, send_buffer)

src/netlog/netlog-manager.h

@@ -77,8 +77,12 @@ struct Manager {
         TLSManager *tls;
 
         bool keep_alive;
+        bool no_delay;
 
         unsigned keep_alive_cnt;
+
+        size_t send_buffer;
+
         usec_t timeout_usec;
         usec_t keep_alive_time;
         usec_t keep_alive_interval;

src/netlog/netlog-network.c

@@ -410,16 +410,22 @@ int manager_open_network_socket(Manager *m) {
         switch (m->protocol) {
                 case SYSLOG_TRANSMISSION_PROTOCOL_UDP: {
                         r = setsockopt_int(m->socket, IPPROTO_IP, IP_MULTICAST_LOOP, true);
-                        if (r < 0) {
-                                r = -errno;
-                                log_error_errno(errno, "UDP: Failed to set IP_MULTICAST_LOOP: %m");
-                                goto fail;
-                        }}
+                        if (r < 0)
+                                log_debug_errno(errno, "UDP: Failed to set IP_MULTICAST_LOOP: %m");
+                        }
                         break;
                 case SYSLOG_TRANSMISSION_PROTOCOL_TCP: {
-                        r = setsockopt_int(m->socket, IPPROTO_TCP, TCP_NODELAY, true);
-                        if (r < 0)
-                                log_debug_errno(r, "Failed to enable TCP_NODELAY mode, ignoring: %m");
+                        if (m->no_delay) {
+                                r = setsockopt_int(m->socket, IPPROTO_TCP, TCP_NODELAY, true);
+                                if (r < 0)
+                                        log_debug_errno(r, "Failed to enable TCP_NODELAY mode, ignoring: %m");
+                        }
+
+                        if (m->send_buffer > 0) {
+                                r = fd_set_sndbuf(m->socket, m->send_buffer, false);
+                                if (r < 0)
+                                        log_debug_errno(r, "SO_SNDBUF/SO_SNDBUFFORCE failed: %m");
+                        }
 
                         if (m->keep_alive) {
                                 r = setsockopt_int(m->socket, SOL_SOCKET, SO_KEEPALIVE, true);

src/share/conf-parser.c

@@ -481,6 +481,38 @@ int config_parse_bool(
         return 0;
 }
 
+int config_parse_iec_size(
+                const char* unit,
+                const char *filename,
+                unsigned line,
+                const char *section,
+                unsigned section_line,
+                const char *lvalue,
+                int ltype,
+                const char *rvalue,
+                void *data,
+                void *userdata) {
+
+        size_t *sz = ASSERT_PTR(data);
+        uint64_t v;
+        int r;
+
+        assert(filename);
+        assert(lvalue);
+        assert(rvalue);
+
+        r = parse_size(rvalue, 1024, &v);
+        if (r >= 0 && (uint64_t) (size_t) v != v)
+                r = -ERANGE;
+        if (r < 0) {
+                log_syntax(unit, LOG_WARNING, filename, line, r, "Failed to parse size value '%s', ignoring: %m", rvalue);
+                return 0;
+        }
+
+        *sz = (size_t) v;
+        return 0;
+}
+
 #define DEFINE_PARSER(type, vartype, conv_func)                         \
         DEFINE_CONFIG_PARSE_PTR(config_parse_##type, conv_func, vartype, "Failed to parse " #type " value")
 

src/share/conf-parser.h

@@ -251,3 +251,4 @@ CONFIG_PARSER_PROTOTYPE(config_parse_string);
 CONFIG_PARSER_PROTOTYPE(config_parse_bool);
 CONFIG_PARSER_PROTOTYPE(config_parse_sec);
 CONFIG_PARSER_PROTOTYPE(config_parse_unsigned);
+CONFIG_PARSER_PROTOTYPE(config_parse_iec_size);

src/share/parse-util.c

@@ -128,3 +128,130 @@ int safe_atolli(const char *s, long long int *ret_lli) {
         *ret_lli = l;
         return 0;
 }
+
+int parse_size(const char *t, uint64_t base, uint64_t *size) {
+
+        /* Soo, sometimes we want to parse IEC binary suffixes, and
+         * sometimes SI decimal suffixes. This function can parse
+         * both. Which one is the right way depends on the
+         * context. Wikipedia suggests that SI is customary for
+         * hardware metrics and network speeds, while IEC is
+         * customary for most data sizes used by software and volatile
+         * (RAM) memory. Hence be careful which one you pick!
+         *
+         * In either case we use just K, M, G as suffix, and not Ki,
+         * Mi, Gi or so (as IEC would suggest). That's because that's
+         * frickin' ugly. But this means you really need to make sure
+         * to document which base you are parsing when you use this
+         * call. */
+
+        struct table {
+                const char *suffix;
+                unsigned long long factor;
+        };
+
+        static const struct table iec[] = {
+                { "E", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
+                { "P", 1024ULL*1024ULL*1024ULL*1024ULL*1024ULL },
+                { "T", 1024ULL*1024ULL*1024ULL*1024ULL },
+                { "G", 1024ULL*1024ULL*1024ULL },
+                { "M", 1024ULL*1024ULL },
+                { "K", 1024ULL },
+                { "B", 1ULL },
+                { "",  1ULL },
+        };
+
+        static const struct table si[] = {
+                { "E", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
+                { "P", 1000ULL*1000ULL*1000ULL*1000ULL*1000ULL },
+                { "T", 1000ULL*1000ULL*1000ULL*1000ULL },
+                { "G", 1000ULL*1000ULL*1000ULL },
+                { "M", 1000ULL*1000ULL },
+                { "K", 1000ULL },
+                { "B", 1ULL },
+                { "",  1ULL },
+        };
+
+        const struct table *table;
+        const char *p;
+        unsigned long long r = 0;
+        unsigned n_entries, start_pos = 0;
+
+        assert(t);
+        assert(IN_SET(base, 1000, 1024));
+        assert(size);
+
+  if (base == 1000) {
+                table = si;
+                n_entries = ELEMENTSOF(si);
+        } else {
+                table = iec;
+                n_entries = ELEMENTSOF(iec);
+        }
+
+        p = t;
+        do {
+                unsigned long long l, tmp;
+                double frac = 0;
+                char *e;
+                unsigned i;
+
+                p += strspn(p, WHITESPACE);
+
+                errno = 0;
+                l = strtoull(p, &e, 10);
+                if (errno > 0)
+                        return -errno;
+                if (e == p)
+                        return -EINVAL;
+                if (*p == '-')
+                        return -ERANGE;
+
+                if (*e == '.') {
+                        e++;
+
+                        /* strtoull() itself would accept space/+/- */
+                        if (ascii_isdigit(*e)) {
+                                unsigned long long l2;
+                                char *e2;
+
+                                l2 = strtoull(e, &e2, 10);
+                                if (errno > 0)
+                                        return -errno;
+
+                                /* Ignore failure. E.g. 10.M is valid */
+                                frac = l2;
+                                for (; e < e2; e++)
+                                        frac /= 10;
+                        }
+                }
+
+                e += strspn(e, WHITESPACE);
+
+                for (i = start_pos; i < n_entries; i++)
+                        if (startswith(e, table[i].suffix))
+                                break;
+
+                if (i >= n_entries)
+                        return -EINVAL;
+                if (l + (frac > 0) > ULLONG_MAX / table[i].factor)
+                        return -ERANGE;
+
+                tmp = l * table[i].factor + (unsigned long long) (frac * table[i].factor);
+                if (tmp > ULLONG_MAX - r)
+                        return -ERANGE;
+
+                r += tmp;
+                if ((unsigned long long) (uint64_t) r != r)
+                        return -ERANGE;
+
+                p = e + strlen(table[i].suffix);
+
+                start_pos = i + 1;
+
+        } while (*p);
+
+        *size = r;
+
+        return 0;
+}

src/share/parse-util.h

@@ -27,6 +27,8 @@ static inline int safe_atou32(const char *s, uint32_t *ret_u) {
         return safe_atou(s, (unsigned*) ret_u);
 }
 
+int parse_size(const char *t, uint64_t base, uint64_t *size);
+
 #if LONG_MAX == INT_MAX
 static inline int safe_atolu(const char *s, unsigned long *ret_u) {
         assert_cc(sizeof(unsigned long) == sizeof(unsigned));

src/share/socket-util.c

@@ -287,3 +287,34 @@ int sockaddr_pretty(
         *ret = p;
         return 0;
 }
+
+int fd_set_sndbuf(int fd, size_t n, bool increase) {
+        int r, value;
+        socklen_t l = sizeof(value);
+
+        if (n > INT_MAX)
+                return -ERANGE;
+
+        r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
+        if (r >= 0 && l == sizeof(value) && increase ? (size_t) value >= n*2 : (size_t) value == n*2)
+                return 0;
+
+        /* First, try to set the buffer size with SO_SNDBUF. */
+        r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUF, n);
+        if (r < 0)
+                return r;
+
+        /* SO_SNDBUF above may set to the kernel limit, instead of the requested size.
+         * So, we need to check the actual buffer size here. */
+        l = sizeof(value);
+        r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l);
+        if (r >= 0 && l == sizeof(value) && increase ? (size_t) value >= n*2 : (size_t) value == n*2)
+                return 1;
+
+        /* If we have the privileges we will ignore the kernel limit. */
+        r = setsockopt_int(fd, SOL_SOCKET, SO_SNDBUFFORCE, n);
+        if (r < 0)
+                return r;
+
+        return 1;
+}

src/share/socket-util.h

@@ -103,3 +103,5 @@ static inline int getsockopt_int(int fd, int level, int optname, int *ret) {
         *ret = v;
         return 0;
 }
+
+int fd_set_sndbuf(int fd, size_t n, bool increase);