diff options
Diffstat (limited to 'src/basic/socket-util.c')
| -rw-r--r-- | src/basic/socket-util.c | 238 |
1 files changed, 205 insertions, 33 deletions
diff --git a/src/basic/socket-util.c b/src/basic/socket-util.c index 8fd3149276..be144e157d 100644 --- a/src/basic/socket-util.c +++ b/src/basic/socket-util.c @@ -19,23 +19,33 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ -#include <string.h> -#include <unistd.h> -#include <errno.h> #include <arpa/inet.h> -#include <stdio.h> +#include <errno.h> +#include <limits.h> #include <net/if.h> -#include <sys/types.h> -#include <stddef.h> #include <netdb.h> +#include <netinet/ip.h> +#include <stddef.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include "alloc-util.h" +#include "fd-util.h" +#include "fileio.h" +#include "formats-util.h" +#include "log.h" #include "macro.h" +#include "missing.h" +#include "parse-util.h" #include "path-util.h" -#include "util.h" #include "socket-util.h" -#include "missing.h" -#include "fileio.h" -#include "formats-util.h" +#include "string-table.h" +#include "string-util.h" +#include "user-util.h" +#include "util.h" int socket_address_parse(SocketAddress *a, const char *s) { char *e, *n; @@ -430,17 +440,10 @@ const char* socket_address_get_path(const SocketAddress *a) { } bool socket_ipv6_is_supported(void) { - _cleanup_free_ char *l = NULL; - - if (access("/sys/module/ipv6", F_OK) != 0) + if (access("/proc/net/sockstat6", F_OK) != 0) return false; - /* If we can't check "disable" parameter, assume enabled */ - if (read_one_line_file("/sys/module/ipv6/parameters/disable", &l) < 0) - return true; - - /* If module was loaded with disable=1 no IPv6 available */ - return l[0] == '0'; + return true; } bool socket_address_matches_fd(const SocketAddress *a, int fd) { @@ -749,21 +752,190 @@ bool sockaddr_equal(const union sockaddr_union *a, const union sockaddr_union *b return false; } -char* ether_addr_to_string(const struct ether_addr *addr, char buffer[ETHER_ADDR_TO_STRING_MAX]) { - assert(addr); - assert(buffer); +int fd_inc_sndbuf(int fd, size_t n) { + int r, value; + socklen_t l = sizeof(value); + + r = getsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, &l); + if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) + return 0; + + /* If we have the privileges we will ignore the kernel limit. */ + + value = (int) n; + if (setsockopt(fd, SOL_SOCKET, SO_SNDBUFFORCE, &value, sizeof(value)) < 0) + if (setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &value, sizeof(value)) < 0) + return -errno; + + return 1; +} + +int fd_inc_rcvbuf(int fd, size_t n) { + int r, value; + socklen_t l = sizeof(value); + + r = getsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, &l); + if (r >= 0 && l == sizeof(value) && (size_t) value >= n*2) + return 0; + + /* If we have the privileges we will ignore the kernel limit. */ + + value = (int) n; + if (setsockopt(fd, SOL_SOCKET, SO_RCVBUFFORCE, &value, sizeof(value)) < 0) + if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &value, sizeof(value)) < 0) + return -errno; + return 1; +} + +static const char* const ip_tos_table[] = { + [IPTOS_LOWDELAY] = "low-delay", + [IPTOS_THROUGHPUT] = "throughput", + [IPTOS_RELIABILITY] = "reliability", + [IPTOS_LOWCOST] = "low-cost", +}; + +DEFINE_STRING_TABLE_LOOKUP_WITH_FALLBACK(ip_tos, int, 0xff); + +int getpeercred(int fd, struct ucred *ucred) { + socklen_t n = sizeof(struct ucred); + struct ucred u; + int r; + + assert(fd >= 0); + assert(ucred); + + r = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &u, &n); + if (r < 0) + return -errno; + + if (n != sizeof(struct ucred)) + return -EIO; + + /* Check if the data is actually useful and not suppressed due + * to namespacing issues */ + if (u.pid <= 0) + return -ENODATA; + if (u.uid == UID_INVALID) + return -ENODATA; + if (u.gid == GID_INVALID) + return -ENODATA; + + *ucred = u; + return 0; +} + +int getpeersec(int fd, char **ret) { + socklen_t n = 64; + char *s; + int r; - /* Like ether_ntoa() but uses %02x instead of %x to print - * ethernet addresses, which makes them look less funny. Also, - * doesn't use a static buffer. */ + assert(fd >= 0); + assert(ret); + + s = new0(char, n); + if (!s) + return -ENOMEM; + + r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); + if (r < 0) { + free(s); + + if (errno != ERANGE) + return -errno; + + s = new0(char, n); + if (!s) + return -ENOMEM; + + r = getsockopt(fd, SOL_SOCKET, SO_PEERSEC, s, &n); + if (r < 0) { + free(s); + return -errno; + } + } - sprintf(buffer, "%02x:%02x:%02x:%02x:%02x:%02x", - addr->ether_addr_octet[0], - addr->ether_addr_octet[1], - addr->ether_addr_octet[2], - addr->ether_addr_octet[3], - addr->ether_addr_octet[4], - addr->ether_addr_octet[5]); + if (isempty(s)) { + free(s); + return -EOPNOTSUPP; + } + + *ret = s; + return 0; +} + +int send_one_fd_sa( + int transport_fd, + int fd, + const struct sockaddr *sa, socklen_t len, + int flags) { + + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int))]; + } control = {}; + struct cmsghdr *cmsg; + + struct msghdr mh = { + .msg_name = (struct sockaddr*) sa, + .msg_namelen = len, + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + + assert(transport_fd >= 0); + assert(fd >= 0); + + cmsg = CMSG_FIRSTHDR(&mh); + cmsg->cmsg_level = SOL_SOCKET; + cmsg->cmsg_type = SCM_RIGHTS; + cmsg->cmsg_len = CMSG_LEN(sizeof(int)); + memcpy(CMSG_DATA(cmsg), &fd, sizeof(int)); + + mh.msg_controllen = CMSG_SPACE(sizeof(int)); + if (sendmsg(transport_fd, &mh, MSG_NOSIGNAL | flags) < 0) + return -errno; + + return 0; +} + +int receive_one_fd(int transport_fd, int flags) { + union { + struct cmsghdr cmsghdr; + uint8_t buf[CMSG_SPACE(sizeof(int))]; + } control = {}; + struct msghdr mh = { + .msg_control = &control, + .msg_controllen = sizeof(control), + }; + struct cmsghdr *cmsg, *found = NULL; + + assert(transport_fd >= 0); + + /* + * Receive a single FD via @transport_fd. We don't care for + * the transport-type. We retrieve a single FD at most, so for + * packet-based transports, the caller must ensure to send + * only a single FD per packet. This is best used in + * combination with send_one_fd(). + */ + + if (recvmsg(transport_fd, &mh, MSG_NOSIGNAL | MSG_CMSG_CLOEXEC | flags) < 0) + return -errno; + + CMSG_FOREACH(cmsg, &mh) { + if (cmsg->cmsg_level == SOL_SOCKET && + cmsg->cmsg_type == SCM_RIGHTS && + cmsg->cmsg_len == CMSG_LEN(sizeof(int))) { + assert(!found); + found = cmsg; + break; + } + } + + if (!found) { + cmsg_close_all(&mh); + return -EIO; + } - return buffer; + return *(int*) CMSG_DATA(found); } |