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Fri, 19 Feb 2021 16:13:35 -0800 (PST) Date: Fri, 19 Feb 2021 16:13:21 -0800 In-Reply-To: <20210220001322.1311139-1-dje@google.com> Message-Id: <20210220001322.1311139-5-dje@google.com> Mime-Version: 1.0 References: <20210220001322.1311139-1-dje@google.com> X-Mailer: git-send-email 2.30.0.617.g56c4b15f3c-goog Subject: [PATCH v5 4/5] net/slirp.c: Refactor address parsing To: qemu-devel@nongnu.org Cc: Samuel Thibault , " =?utf-8?q?Daniel_P_?= =?utf-8?q?=2E_Berrang=C3=A9?= " , Doug Evans Received-SPF: pass client-ip=2607:f8b0:4864:20::1049; envelope-from=3L1QwYAMKCqADJEGOOGLE.COMQEMU-DEVELNONGNU.ORG@flex--dje.bounces.google.com; helo=mail-pj1-x1049.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Reply-to: Doug Evans X-Patchwork-Original-From: Doug Evans via From: Doug Evans ... in preparation for adding ipv6 host forwarding support. New test: avocado run tests/acceptance/hostfwd.py Signed-off-by: Doug Evans --- Changes from v4: - was 3/4 in v4 - fix some formatting issues Changes from v3: - this patch renamed from 2/3 to 3/4 - call inet_parse_host_and_port from util/qemu-sockets.c - added tests/acceptance/hostfwd.py Changes from v2: - nothing of consequence Changes from v1: - this patch is new in v2 - address parsing refactor split out, ipv4 changes here - libslirp part is now upstream in libslirp repo net/slirp.c | 165 ++++++++++++++++++++++-------------- tests/acceptance/hostfwd.py | 94 ++++++++++++++++++++ 2 files changed, 196 insertions(+), 63 deletions(-) create mode 100644 tests/acceptance/hostfwd.py diff --git a/net/slirp.c b/net/slirp.c index be914c0be0..e0284492b9 100644 --- a/net/slirp.c +++ b/net/slirp.c @@ -631,15 +631,91 @@ static SlirpState *slirp_lookup(Monitor *mon, const char *id) } } +/* + * Parse a protocol name of the form "name". + * Valid protocols are "tcp" and "udp". An empty string means "tcp". + * Returns a pointer to the end of the parsed string on success, and stores + * the result in *is_udp. + * Otherwise returns NULL and stores the error in *errp. + */ +static const char *parse_protocol(const char *str, int sep, bool *is_udp, + Error **errp) +{ + char buf[10]; + const char *p = str; + + if (get_str_sep(buf, sizeof(buf), &p, sep) < 0) { + error_setg(errp, "Missing protocol name separator"); + return NULL; + } + + if (!strcmp(buf, "tcp") || buf[0] == '\0') { + *is_udp = false; + } else if (!strcmp(buf, "udp")) { + *is_udp = true; + } else { + error_setg(errp, "Bad protocol name"); + return NULL; + } + + return p; +} + +/* + * Parse an ip address/port of the form "address:port". + * An empty address means INADDR_ANY. + * Returns a pointer to after the terminator, unless it was '\0' in which case + * the result points to the '\0'. + * The parsed results are stored in *addr, *port. + * On error NULL is returned and stores the error in *errp. + */ +static const char *parse_ip_addr_and_port(const char *str, int terminator, + struct in_addr *addr, int *port, + Error **errp) +{ + g_autofree char *addr_str = NULL; + g_autofree char *port_str = NULL; + bool is_v6; + const char *p = inet_parse_host_and_port(str, terminator, &addr_str, + &port_str, &is_v6, errp); + + if (p == NULL) { + return NULL; + } + + /* Ignore is_v6 for the moment, if inet_aton fails let it. */ + if (addr_str[0] == '\0') { + addr->s_addr = INADDR_ANY; + } else if (!inet_aton(addr_str, addr)) { + error_setg(errp, "Bad address"); + return NULL; + } + + if (qemu_strtoi(port_str, NULL, 10, port) < 0 || + *port < 0 || *port > 65535) { + error_setg(errp, "Bad port"); + return NULL; + } + + /* + * At this point "p" points to the terminator or trailing NUL if the + * terminator is not present. + */ + if (*p) { + ++p; + } + return p; +} + void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) { - struct in_addr host_addr = { .s_addr = INADDR_ANY }; + struct in_addr host_addr; int host_port; - char buf[256]; const char *src_str, *p; SlirpState *s; - int is_udp = 0; + bool is_udp; int err; + Error *error = NULL; const char *arg1 = qdict_get_str(qdict, "arg1"); const char *arg2 = qdict_get_try_str(qdict, "arg2"); @@ -654,30 +730,18 @@ void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) return; } + g_assert(src_str != NULL); p = src_str; - if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - goto fail_syntax; - } - - if (!strcmp(buf, "tcp") || buf[0] == '\0') { - is_udp = 0; - } else if (!strcmp(buf, "udp")) { - is_udp = 1; - } else { - goto fail_syntax; - } - if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - goto fail_syntax; - } - if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { + p = parse_protocol(p, ':', &is_udp, &error); + if (p == NULL) { goto fail_syntax; } - if (qemu_strtoi(p, NULL, 10, &host_port)) { + if (parse_ip_addr_and_port(p, '\0', &host_addr, &host_port, + &error) == NULL) { goto fail_syntax; } - err = slirp_remove_hostfwd(s->slirp, is_udp, host_addr, host_port); monitor_printf(mon, "host forwarding rule for %s %s\n", src_str, @@ -685,65 +749,39 @@ void hmp_hostfwd_remove(Monitor *mon, const QDict *qdict) return; fail_syntax: - monitor_printf(mon, "invalid format\n"); + monitor_printf(mon, "Invalid format: %s\n", error_get_pretty(error)); + error_free(error); } static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) { - struct in_addr host_addr = { .s_addr = INADDR_ANY }; - struct in_addr guest_addr = { .s_addr = 0 }; + struct in_addr host_addr, guest_addr; int host_port, guest_port; const char *p; - char buf[256]; - int is_udp; - char *end; - const char *fail_reason = "Unknown reason"; + bool is_udp; + Error *error = NULL; + g_assert(redir_str != NULL); p = redir_str; - if (!p || get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - fail_reason = "No : separators"; - goto fail_syntax; - } - if (!strcmp(buf, "tcp") || buf[0] == '\0') { - is_udp = 0; - } else if (!strcmp(buf, "udp")) { - is_udp = 1; - } else { - fail_reason = "Bad protocol name"; - goto fail_syntax; - } - if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - fail_reason = "Missing : separator"; - goto fail_syntax; - } - if (buf[0] != '\0' && !inet_aton(buf, &host_addr)) { - fail_reason = "Bad host address"; + p = parse_protocol(p, ':', &is_udp, &error); + if (p == NULL) { goto fail_syntax; } - if (get_str_sep(buf, sizeof(buf), &p, '-') < 0) { - fail_reason = "Bad host port separator"; - goto fail_syntax; - } - host_port = strtol(buf, &end, 0); - if (*end != '\0' || host_port < 0 || host_port > 65535) { - fail_reason = "Bad host port"; + p = parse_ip_addr_and_port(p, '-', &host_addr, &host_port, &error); + if (p == NULL) { + error_prepend(&error, "For host address: "); goto fail_syntax; } - if (get_str_sep(buf, sizeof(buf), &p, ':') < 0) { - fail_reason = "Missing guest address"; + if (parse_ip_addr_and_port(p, '\0', &guest_addr, &guest_port, + &error) == NULL) { + error_prepend(&error, "For guest address: "); goto fail_syntax; } - if (buf[0] != '\0' && !inet_aton(buf, &guest_addr)) { - fail_reason = "Bad guest address"; - goto fail_syntax; - } - - guest_port = strtol(p, &end, 0); - if (*end != '\0' || guest_port < 1 || guest_port > 65535) { - fail_reason = "Bad guest port"; + if (guest_port == 0) { + error_setg(&error, "For guest address: Bad port"); goto fail_syntax; } @@ -757,7 +795,8 @@ static int slirp_hostfwd(SlirpState *s, const char *redir_str, Error **errp) fail_syntax: error_setg(errp, "Invalid host forwarding rule '%s' (%s)", redir_str, - fail_reason); + error_get_pretty(error)); + error_free(error); return -1; } diff --git a/tests/acceptance/hostfwd.py b/tests/acceptance/hostfwd.py new file mode 100644 index 0000000000..e5602a7708 --- /dev/null +++ b/tests/acceptance/hostfwd.py @@ -0,0 +1,94 @@ +# Hostfwd command tests +# +# Copyright 2021 Google LLC +# +# This program is free software; you can redistribute it and/or modify it +# under the terms of the GNU General Public License as published by the +# Free Software Foundation; either version 2 of the License, or +# (at your option) any later version. +# +# This program is distributed in the hope that it will be useful, but WITHOUT +# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +# for more details. + + +from avocado_qemu import Test + + +class Hostfwd(Test): + """ + :avocado: tags=hostfwd + """ + def hmc(self, cmd): + return self.vm.command('human-monitor-command', command_line=cmd) + + def test_qmp_hostfwd_ipv4(self): + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=vnet', + '-device', 'virtio-net,netdev=vnet') + self.vm.launch() + self.assertEquals(self.hmc('hostfwd_add vnet tcp::65022-:22'), '') + self.assertEquals(self.hmc('hostfwd_remove vnet tcp::65022'), + 'host forwarding rule for tcp::65022 removed\r\n') + self.assertEquals(self.hmc('hostfwd_add tcp::65022-:22'), '') + self.assertEquals(self.hmc('hostfwd_remove tcp::65022'), + 'host forwarding rule for tcp::65022 removed\r\n') + self.assertEquals(self.hmc('hostfwd_add udp::65042-:42'), '') + self.assertEquals(self.hmc('hostfwd_remove udp::65042'), + 'host forwarding rule for udp::65042 removed\r\n') + + def test_qmp_hostfwd_ipv4_functional_errors(self): + """Verify handling of various kinds of errors given valid addresses.""" + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=vnet', + '-device', 'virtio-net,netdev=vnet') + self.vm.launch() + self.assertEquals(self.hmc('hostfwd_remove ::65022'), + 'host forwarding rule for ::65022 not found\r\n') + self.assertEquals(self.hmc('hostfwd_add udp::65042-:42'), '') + self.assertEquals(self.hmc('hostfwd_add udp::65042-:42'), + "Could not set up host forwarding rule " + "'udp::65042-:42'\r\n") + self.assertEquals(self.hmc('hostfwd_remove ::65042'), + 'host forwarding rule for ::65042 not found\r\n') + self.assertEquals(self.hmc('hostfwd_remove udp::65042'), + 'host forwarding rule for udp::65042 removed\r\n') + self.assertEquals(self.hmc('hostfwd_remove udp::65042'), + 'host forwarding rule for udp::65042 not found\r\n') + + def test_qmp_hostfwd_ipv4_parsing_errors(self): + """Verify handling of various kinds of parsing errors.""" + self.vm.add_args('-nodefaults', + '-netdev', 'user,id=vnet', + '-device', 'virtio-net,netdev=vnet') + self.vm.launch() + self.assertEquals(self.hmc('hostfwd_remove abc::42'), + 'Invalid format: Bad protocol name\r\n') + self.assertEquals(self.hmc('hostfwd_add abc::65022-:22'), + "Invalid host forwarding rule 'abc::65022-:22' " + "(Bad protocol name)\r\n") + self.assertEquals(self.hmc('hostfwd_add :a.b.c.d:66-:66'), + "Invalid host forwarding rule ':a.b.c.d:66-:66' " + "(For host address: Bad address)\r\n") + self.assertEquals(self.hmc('hostfwd_add ::66-a.b.c.d:66'), + "Invalid host forwarding rule '::66-a.b.c.d:66' " + "(For guest address: Bad address)\r\n") + self.assertEquals(self.hmc('hostfwd_add ::66666-:66666'), + "Invalid host forwarding rule '::66666-:66666' " + "(For host address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add ::-1-foo'), + "Invalid host forwarding rule '::-1-foo' (For " + "host address: error parsing port in address ':')\r\n") + self.assertEquals(self.hmc('hostfwd_add ::66-foo'), + "Invalid host forwarding rule '::66-foo' (For " + "guest address: error parsing address 'foo')\r\n") + self.assertEquals(self.hmc('hostfwd_add ::66-:66666'), + "Invalid host forwarding rule '::66-:66666' " + "(For guest address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add ::66-:-1'), + "Invalid host forwarding rule '::66-:-1' " + "(For guest address: Bad port)\r\n") + self.assertEquals(self.hmc('hostfwd_add ::66-:0'), + "Invalid host forwarding rule '::66-:0' " + "(For guest address: Bad port)\r\n")