diff options
Diffstat (limited to 'src/libsystemd/libsystemd-internal/sd-bus/bus-socket.c')
| -rw-r--r-- | src/libsystemd/libsystemd-internal/sd-bus/bus-socket.c | 1064 |
1 files changed, 1064 insertions, 0 deletions
diff --git a/src/libsystemd/libsystemd-internal/sd-bus/bus-socket.c b/src/libsystemd/libsystemd-internal/sd-bus/bus-socket.c new file mode 100644 index 0000000000..1486d7cd55 --- /dev/null +++ b/src/libsystemd/libsystemd-internal/sd-bus/bus-socket.c @@ -0,0 +1,1064 @@ +/*** + This file is part of systemd. + + Copyright 2013 Lennart Poettering + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <endian.h> +#include <poll.h> +#include <stdlib.h> +#include <unistd.h> + +#include <systemd/sd-bus.h> +#include <systemd/sd-daemon.h> + +#include "alloc-util.h" +#include "bus-internal.h" +#include "bus-message.h" +#include "bus-socket.h" +#include "fd-util.h" +#include "formats-util.h" +#include "hexdecoct.h" +#include "macro.h" +#include "missing.h" +#include "selinux-util.h" +#include "signal-util.h" +#include "stdio-util.h" +#include "string-util.h" +#include "user-util.h" +#include "utf8.h" +#include "util.h" + +#define SNDBUF_SIZE (8*1024*1024) + +static void iovec_advance(struct iovec iov[], unsigned *idx, size_t size) { + + while (size > 0) { + struct iovec *i = iov + *idx; + + if (i->iov_len > size) { + i->iov_base = (uint8_t*) i->iov_base + size; + i->iov_len -= size; + return; + } + + size -= i->iov_len; + + i->iov_base = NULL; + i->iov_len = 0; + + (*idx)++; + } +} + +static int append_iovec(sd_bus_message *m, const void *p, size_t sz) { + assert(m); + assert(p); + assert(sz > 0); + + m->iovec[m->n_iovec].iov_base = (void*) p; + m->iovec[m->n_iovec].iov_len = sz; + m->n_iovec++; + + return 0; +} + +static int bus_message_setup_iovec(sd_bus_message *m) { + struct bus_body_part *part; + unsigned n, i; + int r; + + assert(m); + assert(m->sealed); + + if (m->n_iovec > 0) + return 0; + + assert(!m->iovec); + + n = 1 + m->n_body_parts; + if (n < ELEMENTSOF(m->iovec_fixed)) + m->iovec = m->iovec_fixed; + else { + m->iovec = new(struct iovec, n); + if (!m->iovec) { + r = -ENOMEM; + goto fail; + } + } + + r = append_iovec(m, m->header, BUS_MESSAGE_BODY_BEGIN(m)); + if (r < 0) + goto fail; + + MESSAGE_FOREACH_PART(part, i, m) { + r = bus_body_part_map(part); + if (r < 0) + goto fail; + + r = append_iovec(m, part->data, part->size); + if (r < 0) + goto fail; + } + + assert(n == m->n_iovec); + + return 0; + +fail: + m->poisoned = true; + return r; +} + +bool bus_socket_auth_needs_write(sd_bus *b) { + + unsigned i; + + if (b->auth_index >= ELEMENTSOF(b->auth_iovec)) + return false; + + for (i = b->auth_index; i < ELEMENTSOF(b->auth_iovec); i++) { + struct iovec *j = b->auth_iovec + i; + + if (j->iov_len > 0) + return true; + } + + return false; +} + +static int bus_socket_write_auth(sd_bus *b) { + ssize_t k; + + assert(b); + assert(b->state == BUS_AUTHENTICATING); + + if (!bus_socket_auth_needs_write(b)) + return 0; + + if (b->prefer_writev) + k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); + else { + struct msghdr mh; + zero(mh); + + mh.msg_iov = b->auth_iovec + b->auth_index; + mh.msg_iovlen = ELEMENTSOF(b->auth_iovec) - b->auth_index; + + k = sendmsg(b->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); + if (k < 0 && errno == ENOTSOCK) { + b->prefer_writev = true; + k = writev(b->output_fd, b->auth_iovec + b->auth_index, ELEMENTSOF(b->auth_iovec) - b->auth_index); + } + } + + if (k < 0) + return errno == EAGAIN ? 0 : -errno; + + iovec_advance(b->auth_iovec, &b->auth_index, (size_t) k); + return 1; +} + +static int bus_socket_auth_verify_client(sd_bus *b) { + char *e, *f, *start; + sd_id128_t peer; + unsigned i; + int r; + + assert(b); + + /* We expect two response lines: "OK" and possibly + * "AGREE_UNIX_FD" */ + + e = memmem_safe(b->rbuffer, b->rbuffer_size, "\r\n", 2); + if (!e) + return 0; + + if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) { + f = memmem(e + 2, b->rbuffer_size - (e - (char*) b->rbuffer) - 2, "\r\n", 2); + if (!f) + return 0; + + start = f + 2; + } else { + f = NULL; + start = e + 2; + } + + /* Nice! We got all the lines we need. First check the OK + * line */ + + if (e - (char*) b->rbuffer != 3 + 32) + return -EPERM; + + if (memcmp(b->rbuffer, "OK ", 3)) + return -EPERM; + + b->auth = b->anonymous_auth ? BUS_AUTH_ANONYMOUS : BUS_AUTH_EXTERNAL; + + for (i = 0; i < 32; i += 2) { + int x, y; + + x = unhexchar(((char*) b->rbuffer)[3 + i]); + y = unhexchar(((char*) b->rbuffer)[3 + i + 1]); + + if (x < 0 || y < 0) + return -EINVAL; + + peer.bytes[i/2] = ((uint8_t) x << 4 | (uint8_t) y); + } + + if (!sd_id128_equal(b->server_id, SD_ID128_NULL) && + !sd_id128_equal(b->server_id, peer)) + return -EPERM; + + b->server_id = peer; + + /* And possibly check the second line, too */ + + if (f) + b->can_fds = + (f - e == strlen("\r\nAGREE_UNIX_FD")) && + memcmp(e + 2, "AGREE_UNIX_FD", strlen("AGREE_UNIX_FD")) == 0; + + b->rbuffer_size -= (start - (char*) b->rbuffer); + memmove(b->rbuffer, start, b->rbuffer_size); + + r = bus_start_running(b); + if (r < 0) + return r; + + return 1; +} + +static bool line_equals(const char *s, size_t m, const char *line) { + size_t l; + + l = strlen(line); + if (l != m) + return false; + + return memcmp(s, line, l) == 0; +} + +static bool line_begins(const char *s, size_t m, const char *word) { + size_t l; + + l = strlen(word); + if (m < l) + return false; + + if (memcmp(s, word, l) != 0) + return false; + + return m == l || (m > l && s[l] == ' '); +} + +static int verify_anonymous_token(sd_bus *b, const char *p, size_t l) { + _cleanup_free_ char *token = NULL; + size_t len; + int r; + + if (!b->anonymous_auth) + return 0; + + if (l <= 0) + return 1; + + assert(p[0] == ' '); + p++; l--; + + if (l % 2 != 0) + return 0; + + r = unhexmem(p, l, (void **) &token, &len); + if (r < 0) + return 0; + + if (memchr(token, 0, len)) + return 0; + + return !!utf8_is_valid(token); +} + +static int verify_external_token(sd_bus *b, const char *p, size_t l) { + _cleanup_free_ char *token = NULL; + size_t len; + uid_t u; + int r; + + /* We don't do any real authentication here. Instead, we if + * the owner of this bus wanted authentication he should have + * checked SO_PEERCRED before even creating the bus object. */ + + if (!b->anonymous_auth && !b->ucred_valid) + return 0; + + if (l <= 0) + return 1; + + assert(p[0] == ' '); + p++; l--; + + if (l % 2 != 0) + return 0; + + r = unhexmem(p, l, (void**) &token, &len); + if (r < 0) + return 0; + + if (memchr(token, 0, len)) + return 0; + + r = parse_uid(token, &u); + if (r < 0) + return 0; + + /* We ignore the passed value if anonymous authentication is + * on anyway. */ + if (!b->anonymous_auth && u != b->ucred.uid) + return 0; + + return 1; +} + +static int bus_socket_auth_write(sd_bus *b, const char *t) { + char *p; + size_t l; + + assert(b); + assert(t); + + /* We only make use of the first iovec */ + assert(b->auth_index == 0 || b->auth_index == 1); + + l = strlen(t); + p = malloc(b->auth_iovec[0].iov_len + l); + if (!p) + return -ENOMEM; + + memcpy_safe(p, b->auth_iovec[0].iov_base, b->auth_iovec[0].iov_len); + memcpy(p + b->auth_iovec[0].iov_len, t, l); + + b->auth_iovec[0].iov_base = p; + b->auth_iovec[0].iov_len += l; + + free(b->auth_buffer); + b->auth_buffer = p; + b->auth_index = 0; + return 0; +} + +static int bus_socket_auth_write_ok(sd_bus *b) { + char t[3 + 32 + 2 + 1]; + + assert(b); + + xsprintf(t, "OK " SD_ID128_FORMAT_STR "\r\n", SD_ID128_FORMAT_VAL(b->server_id)); + + return bus_socket_auth_write(b, t); +} + +static int bus_socket_auth_verify_server(sd_bus *b) { + char *e; + const char *line; + size_t l; + bool processed = false; + int r; + + assert(b); + + if (b->rbuffer_size < 1) + return 0; + + /* First char must be a NUL byte */ + if (*(char*) b->rbuffer != 0) + return -EIO; + + if (b->rbuffer_size < 3) + return 0; + + /* Begin with the first line */ + if (b->auth_rbegin <= 0) + b->auth_rbegin = 1; + + for (;;) { + /* Check if line is complete */ + line = (char*) b->rbuffer + b->auth_rbegin; + e = memmem(line, b->rbuffer_size - b->auth_rbegin, "\r\n", 2); + if (!e) + return processed; + + l = e - line; + + if (line_begins(line, l, "AUTH ANONYMOUS")) { + + r = verify_anonymous_token(b, line + 14, l - 14); + if (r < 0) + return r; + if (r == 0) + r = bus_socket_auth_write(b, "REJECTED\r\n"); + else { + b->auth = BUS_AUTH_ANONYMOUS; + r = bus_socket_auth_write_ok(b); + } + + } else if (line_begins(line, l, "AUTH EXTERNAL")) { + + r = verify_external_token(b, line + 13, l - 13); + if (r < 0) + return r; + if (r == 0) + r = bus_socket_auth_write(b, "REJECTED\r\n"); + else { + b->auth = BUS_AUTH_EXTERNAL; + r = bus_socket_auth_write_ok(b); + } + + } else if (line_begins(line, l, "AUTH")) + r = bus_socket_auth_write(b, "REJECTED EXTERNAL ANONYMOUS\r\n"); + else if (line_equals(line, l, "CANCEL") || + line_begins(line, l, "ERROR")) { + + b->auth = _BUS_AUTH_INVALID; + r = bus_socket_auth_write(b, "REJECTED\r\n"); + + } else if (line_equals(line, l, "BEGIN")) { + + if (b->auth == _BUS_AUTH_INVALID) + r = bus_socket_auth_write(b, "ERROR\r\n"); + else { + /* We can't leave from the auth phase + * before we haven't written + * everything queued, so let's check + * that */ + + if (bus_socket_auth_needs_write(b)) + return 1; + + b->rbuffer_size -= (e + 2 - (char*) b->rbuffer); + memmove(b->rbuffer, e + 2, b->rbuffer_size); + return bus_start_running(b); + } + + } else if (line_begins(line, l, "DATA")) { + + if (b->auth == _BUS_AUTH_INVALID) + r = bus_socket_auth_write(b, "ERROR\r\n"); + else { + if (b->auth == BUS_AUTH_ANONYMOUS) + r = verify_anonymous_token(b, line + 4, l - 4); + else + r = verify_external_token(b, line + 4, l - 4); + + if (r < 0) + return r; + if (r == 0) { + b->auth = _BUS_AUTH_INVALID; + r = bus_socket_auth_write(b, "REJECTED\r\n"); + } else + r = bus_socket_auth_write_ok(b); + } + } else if (line_equals(line, l, "NEGOTIATE_UNIX_FD")) { + if (b->auth == _BUS_AUTH_INVALID || !(b->hello_flags & KDBUS_HELLO_ACCEPT_FD)) + r = bus_socket_auth_write(b, "ERROR\r\n"); + else { + b->can_fds = true; + r = bus_socket_auth_write(b, "AGREE_UNIX_FD\r\n"); + } + } else + r = bus_socket_auth_write(b, "ERROR\r\n"); + + if (r < 0) + return r; + + b->auth_rbegin = e + 2 - (char*) b->rbuffer; + + processed = true; + } +} + +static int bus_socket_auth_verify(sd_bus *b) { + assert(b); + + if (b->is_server) + return bus_socket_auth_verify_server(b); + else + return bus_socket_auth_verify_client(b); +} + +static int bus_socket_read_auth(sd_bus *b) { + struct msghdr mh; + struct iovec iov = {}; + size_t n; + ssize_t k; + int r; + void *p; + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; + } control; + bool handle_cmsg = false; + + assert(b); + assert(b->state == BUS_AUTHENTICATING); + + r = bus_socket_auth_verify(b); + if (r != 0) + return r; + + n = MAX(256u, b->rbuffer_size * 2); + + if (n > BUS_AUTH_SIZE_MAX) + n = BUS_AUTH_SIZE_MAX; + + if (b->rbuffer_size >= n) + return -ENOBUFS; + + p = realloc(b->rbuffer, n); + if (!p) + return -ENOMEM; + + b->rbuffer = p; + + iov.iov_base = (uint8_t*) b->rbuffer + b->rbuffer_size; + iov.iov_len = n - b->rbuffer_size; + + if (b->prefer_readv) + k = readv(b->input_fd, &iov, 1); + else { + zero(mh); + mh.msg_iov = &iov; + mh.msg_iovlen = 1; + mh.msg_control = &control; + mh.msg_controllen = sizeof(control); + + k = recvmsg(b->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); + if (k < 0 && errno == ENOTSOCK) { + b->prefer_readv = true; + k = readv(b->input_fd, &iov, 1); + } else + handle_cmsg = true; + } + if (k < 0) + return errno == EAGAIN ? 0 : -errno; + if (k == 0) + return -ECONNRESET; + + b->rbuffer_size += k; + + if (handle_cmsg) { + struct cmsghdr *cmsg; + + CMSG_FOREACH(cmsg, &mh) + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_RIGHTS) { + int j; + + /* Whut? We received fds during the auth + * protocol? Somebody is playing games with + * us. Close them all, and fail */ + j = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); + close_many((int*) CMSG_DATA(cmsg), j); + return -EIO; + } else + log_debug("Got unexpected auxiliary data with level=%d and type=%d", + cmsg->cmsg_level, cmsg->cmsg_type); + } + + r = bus_socket_auth_verify(b); + if (r != 0) + return r; + + return 1; +} + +void bus_socket_setup(sd_bus *b) { + assert(b); + + /* Increase the buffers to 8 MB */ + fd_inc_rcvbuf(b->input_fd, SNDBUF_SIZE); + fd_inc_sndbuf(b->output_fd, SNDBUF_SIZE); + + b->is_kernel = false; + b->message_version = 1; + b->message_endian = 0; +} + +static void bus_get_peercred(sd_bus *b) { + int r; + + assert(b); + + /* Get the peer for socketpair() sockets */ + b->ucred_valid = getpeercred(b->input_fd, &b->ucred) >= 0; + + /* Get the SELinux context of the peer */ + if (mac_selinux_have()) { + r = getpeersec(b->input_fd, &b->label); + if (r < 0 && r != -EOPNOTSUPP) + log_debug_errno(r, "Failed to determine peer security context: %m"); + } +} + +static int bus_socket_start_auth_client(sd_bus *b) { + size_t l; + const char *auth_suffix, *auth_prefix; + + assert(b); + + if (b->anonymous_auth) { + auth_prefix = "\0AUTH ANONYMOUS "; + + /* For ANONYMOUS auth we send some arbitrary "trace" string */ + l = 9; + b->auth_buffer = hexmem("anonymous", l); + } else { + char text[DECIMAL_STR_MAX(uid_t) + 1]; + + auth_prefix = "\0AUTH EXTERNAL "; + + xsprintf(text, UID_FMT, geteuid()); + + l = strlen(text); + b->auth_buffer = hexmem(text, l); + } + + if (!b->auth_buffer) + return -ENOMEM; + + if (b->hello_flags & KDBUS_HELLO_ACCEPT_FD) + auth_suffix = "\r\nNEGOTIATE_UNIX_FD\r\nBEGIN\r\n"; + else + auth_suffix = "\r\nBEGIN\r\n"; + + b->auth_iovec[0].iov_base = (void*) auth_prefix; + b->auth_iovec[0].iov_len = 1 + strlen(auth_prefix + 1); + b->auth_iovec[1].iov_base = (void*) b->auth_buffer; + b->auth_iovec[1].iov_len = l * 2; + b->auth_iovec[2].iov_base = (void*) auth_suffix; + b->auth_iovec[2].iov_len = strlen(auth_suffix); + + return bus_socket_write_auth(b); +} + +int bus_socket_start_auth(sd_bus *b) { + assert(b); + + bus_get_peercred(b); + + b->state = BUS_AUTHENTICATING; + b->auth_timeout = now(CLOCK_MONOTONIC) + BUS_DEFAULT_TIMEOUT; + + if (sd_is_socket(b->input_fd, AF_UNIX, 0, 0) <= 0) + b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD; + + if (b->output_fd != b->input_fd) + if (sd_is_socket(b->output_fd, AF_UNIX, 0, 0) <= 0) + b->hello_flags &= ~KDBUS_HELLO_ACCEPT_FD; + + if (b->is_server) + return bus_socket_read_auth(b); + else + return bus_socket_start_auth_client(b); +} + +int bus_socket_connect(sd_bus *b) { + int r; + + assert(b); + assert(b->input_fd < 0); + assert(b->output_fd < 0); + assert(b->sockaddr.sa.sa_family != AF_UNSPEC); + + b->input_fd = socket(b->sockaddr.sa.sa_family, SOCK_STREAM|SOCK_CLOEXEC|SOCK_NONBLOCK, 0); + if (b->input_fd < 0) + return -errno; + + b->output_fd = b->input_fd; + + bus_socket_setup(b); + + r = connect(b->input_fd, &b->sockaddr.sa, b->sockaddr_size); + if (r < 0) { + if (errno == EINPROGRESS) + return 1; + + return -errno; + } + + return bus_socket_start_auth(b); +} + +int bus_socket_exec(sd_bus *b) { + int s[2], r; + pid_t pid; + + assert(b); + assert(b->input_fd < 0); + assert(b->output_fd < 0); + assert(b->exec_path); + + r = socketpair(AF_UNIX, SOCK_STREAM|SOCK_NONBLOCK|SOCK_CLOEXEC, 0, s); + if (r < 0) + return -errno; + + pid = fork(); + if (pid < 0) { + safe_close_pair(s); + return -errno; + } + if (pid == 0) { + /* Child */ + + (void) reset_all_signal_handlers(); + (void) reset_signal_mask(); + + close_all_fds(s+1, 1); + + assert_se(dup3(s[1], STDIN_FILENO, 0) == STDIN_FILENO); + assert_se(dup3(s[1], STDOUT_FILENO, 0) == STDOUT_FILENO); + + if (s[1] != STDIN_FILENO && s[1] != STDOUT_FILENO) + safe_close(s[1]); + + fd_cloexec(STDIN_FILENO, false); + fd_cloexec(STDOUT_FILENO, false); + fd_nonblock(STDIN_FILENO, false); + fd_nonblock(STDOUT_FILENO, false); + + if (b->exec_argv) + execvp(b->exec_path, b->exec_argv); + else { + const char *argv[] = { b->exec_path, NULL }; + execvp(b->exec_path, (char**) argv); + } + + _exit(EXIT_FAILURE); + } + + safe_close(s[1]); + b->output_fd = b->input_fd = s[0]; + + bus_socket_setup(b); + + return bus_socket_start_auth(b); +} + +int bus_socket_take_fd(sd_bus *b) { + assert(b); + + bus_socket_setup(b); + + return bus_socket_start_auth(b); +} + +int bus_socket_write_message(sd_bus *bus, sd_bus_message *m, size_t *idx) { + struct iovec *iov; + ssize_t k; + size_t n; + unsigned j; + int r; + + assert(bus); + assert(m); + assert(idx); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + if (*idx >= BUS_MESSAGE_SIZE(m)) + return 0; + + r = bus_message_setup_iovec(m); + if (r < 0) + return r; + + n = m->n_iovec * sizeof(struct iovec); + iov = alloca(n); + memcpy_safe(iov, m->iovec, n); + + j = 0; + iovec_advance(iov, &j, *idx); + + if (bus->prefer_writev) + k = writev(bus->output_fd, iov, m->n_iovec); + else { + struct msghdr mh = { + .msg_iov = iov, + .msg_iovlen = m->n_iovec, + }; + + if (m->n_fds > 0) { + struct cmsghdr *control; + + mh.msg_control = control = alloca(CMSG_SPACE(sizeof(int) * m->n_fds)); + mh.msg_controllen = control->cmsg_len = CMSG_LEN(sizeof(int) * m->n_fds); + control->cmsg_level = SOL_SOCKET; + control->cmsg_type = SCM_RIGHTS; + memcpy(CMSG_DATA(control), m->fds, sizeof(int) * m->n_fds); + } + + k = sendmsg(bus->output_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL); + if (k < 0 && errno == ENOTSOCK) { + bus->prefer_writev = true; + k = writev(bus->output_fd, iov, m->n_iovec); + } + } + + if (k < 0) + return errno == EAGAIN ? 0 : -errno; + + *idx += (size_t) k; + return 1; +} + +static int bus_socket_read_message_need(sd_bus *bus, size_t *need) { + uint32_t a, b; + uint8_t e; + uint64_t sum; + + assert(bus); + assert(need); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + if (bus->rbuffer_size < sizeof(struct bus_header)) { + *need = sizeof(struct bus_header) + 8; + + /* Minimum message size: + * + * Header + + * + * Method Call: +2 string headers + * Signal: +3 string headers + * Method Error: +1 string headers + * +1 uint32 headers + * Method Reply: +1 uint32 headers + * + * A string header is at least 9 bytes + * A uint32 header is at least 8 bytes + * + * Hence the minimum message size of a valid message + * is header + 8 bytes */ + + return 0; + } + + a = ((const uint32_t*) bus->rbuffer)[1]; + b = ((const uint32_t*) bus->rbuffer)[3]; + + e = ((const uint8_t*) bus->rbuffer)[0]; + if (e == BUS_LITTLE_ENDIAN) { + a = le32toh(a); + b = le32toh(b); + } else if (e == BUS_BIG_ENDIAN) { + a = be32toh(a); + b = be32toh(b); + } else + return -EBADMSG; + + sum = (uint64_t) sizeof(struct bus_header) + (uint64_t) ALIGN_TO(b, 8) + (uint64_t) a; + if (sum >= BUS_MESSAGE_SIZE_MAX) + return -ENOBUFS; + + *need = (size_t) sum; + return 0; +} + +static int bus_socket_make_message(sd_bus *bus, size_t size) { + sd_bus_message *t; + void *b; + int r; + + assert(bus); + assert(bus->rbuffer_size >= size); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + r = bus_rqueue_make_room(bus); + if (r < 0) + return r; + + if (bus->rbuffer_size > size) { + b = memdup((const uint8_t*) bus->rbuffer + size, + bus->rbuffer_size - size); + if (!b) + return -ENOMEM; + } else + b = NULL; + + r = bus_message_from_malloc(bus, + bus->rbuffer, size, + bus->fds, bus->n_fds, + NULL, + &t); + if (r < 0) { + free(b); + return r; + } + + bus->rbuffer = b; + bus->rbuffer_size -= size; + + bus->fds = NULL; + bus->n_fds = 0; + + bus->rqueue[bus->rqueue_size++] = t; + + return 1; +} + +int bus_socket_read_message(sd_bus *bus) { + struct msghdr mh; + struct iovec iov = {}; + ssize_t k; + size_t need; + int r; + void *b; + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int) * BUS_FDS_MAX)]; + } control; + bool handle_cmsg = false; + + assert(bus); + assert(bus->state == BUS_RUNNING || bus->state == BUS_HELLO); + + r = bus_socket_read_message_need(bus, &need); + if (r < 0) + return r; + + if (bus->rbuffer_size >= need) + return bus_socket_make_message(bus, need); + + b = realloc(bus->rbuffer, need); + if (!b) + return -ENOMEM; + + bus->rbuffer = b; + + iov.iov_base = (uint8_t*) bus->rbuffer + bus->rbuffer_size; + iov.iov_len = need - bus->rbuffer_size; + + if (bus->prefer_readv) + k = readv(bus->input_fd, &iov, 1); + else { + zero(mh); + mh.msg_iov = &iov; + mh.msg_iovlen = 1; + mh.msg_control = &control; + mh.msg_controllen = sizeof(control); + + k = recvmsg(bus->input_fd, &mh, MSG_DONTWAIT|MSG_NOSIGNAL|MSG_CMSG_CLOEXEC); + if (k < 0 && errno == ENOTSOCK) { + bus->prefer_readv = true; + k = readv(bus->input_fd, &iov, 1); + } else + handle_cmsg = true; + } + if (k < 0) + return errno == EAGAIN ? 0 : -errno; + if (k == 0) + return -ECONNRESET; + + bus->rbuffer_size += k; + + if (handle_cmsg) { + struct cmsghdr *cmsg; + + CMSG_FOREACH(cmsg, &mh) + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_RIGHTS) { + int n, *f; + + n = (cmsg->cmsg_len - CMSG_LEN(0)) / sizeof(int); + + if (!bus->can_fds) { + /* Whut? We received fds but this + * isn't actually enabled? Close them, + * and fail */ + + close_many((int*) CMSG_DATA(cmsg), n); + return -EIO; + } + + f = realloc(bus->fds, sizeof(int) * (bus->n_fds + n)); + if (!f) { + close_many((int*) CMSG_DATA(cmsg), n); + return -ENOMEM; + } + + memcpy_safe(f + bus->n_fds, CMSG_DATA(cmsg), n * sizeof(int)); + bus->fds = f; + bus->n_fds += n; + } else + log_debug("Got unexpected auxiliary data with level=%d and type=%d", + cmsg->cmsg_level, cmsg->cmsg_type); + } + + r = bus_socket_read_message_need(bus, &need); + if (r < 0) + return r; + + if (bus->rbuffer_size >= need) + return bus_socket_make_message(bus, need); + + return 1; +} + +int bus_socket_process_opening(sd_bus *b) { + int error = 0; + socklen_t slen = sizeof(error); + struct pollfd p = { + .fd = b->output_fd, + .events = POLLOUT, + }; + int r; + + assert(b->state == BUS_OPENING); + + r = poll(&p, 1, 0); + if (r < 0) + return -errno; + + if (!(p.revents & (POLLOUT|POLLERR|POLLHUP))) + return 0; + + r = getsockopt(b->output_fd, SOL_SOCKET, SO_ERROR, &error, &slen); + if (r < 0) + b->last_connect_error = errno; + else if (error != 0) + b->last_connect_error = error; + else if (p.revents & (POLLERR|POLLHUP)) + b->last_connect_error = ECONNREFUSED; + else + return bus_socket_start_auth(b); + + return bus_next_address(b); +} + +int bus_socket_process_authenticating(sd_bus *b) { + int r; + + assert(b); + assert(b->state == BUS_AUTHENTICATING); + + if (now(CLOCK_MONOTONIC) >= b->auth_timeout) + return -ETIMEDOUT; + + r = bus_socket_write_auth(b); + if (r != 0) + return r; + + return bus_socket_read_auth(b); +} |