[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Connect to host at port using address resolution from getaddrinfo
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| 6 | *
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[2725] | 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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[821] | 8 | */
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| 9 |
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[2725] | 10 | #include <sys/types.h>
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| 11 | #include <sys/socket.h> /* netinet/in.h needs it */
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[821] | 12 | #include <netinet/in.h>
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[2725] | 13 | #include <net/if.h>
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| 14 | #include <sys/un.h>
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[821] | 15 | #include "libbb.h"
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| 16 |
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[3621] | 17 | int FAST_FUNC setsockopt_int(int fd, int level, int optname, int optval)
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| 18 | {
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| 19 | return setsockopt(fd, level, optname, &optval, sizeof(int));
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| 20 | }
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| 21 | int FAST_FUNC setsockopt_1(int fd, int level, int optname)
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| 22 | {
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| 23 | return setsockopt_int(fd, level, optname, 1);
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| 24 | }
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| 25 | int FAST_FUNC setsockopt_SOL_SOCKET_int(int fd, int optname, int optval)
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| 26 | {
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| 27 | return setsockopt_int(fd, SOL_SOCKET, optname, optval);
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| 28 | }
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| 29 | int FAST_FUNC setsockopt_SOL_SOCKET_1(int fd, int optname)
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| 30 | {
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| 31 | return setsockopt_SOL_SOCKET_int(fd, optname, 1);
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| 32 | }
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| 33 |
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[2725] | 34 | void FAST_FUNC setsockopt_reuseaddr(int fd)
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[1765] | 35 | {
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[3621] | 36 | setsockopt_SOL_SOCKET_1(fd, SO_REUSEADDR);
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[1765] | 37 | }
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[2725] | 38 | int FAST_FUNC setsockopt_broadcast(int fd)
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[1765] | 39 | {
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[3621] | 40 | return setsockopt_SOL_SOCKET_1(fd, SO_BROADCAST);
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[1765] | 41 | }
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[3621] | 42 | int FAST_FUNC setsockopt_keepalive(int fd)
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| 43 | {
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| 44 | return setsockopt_SOL_SOCKET_1(fd, SO_KEEPALIVE);
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| 45 | }
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[1765] | 46 |
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[2725] | 47 | #ifdef SO_BINDTODEVICE
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| 48 | int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
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[1765] | 49 | {
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[2725] | 50 | int r;
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| 51 | struct ifreq ifr;
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| 52 | strncpy_IFNAMSIZ(ifr.ifr_name, iface);
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| 53 | /* NB: passing (iface, strlen(iface) + 1) does not work!
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| 54 | * (maybe it works on _some_ kernels, but not on 2.6.26)
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| 55 | * Actually, ifr_name is at offset 0, and in practice
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| 56 | * just giving char[IFNAMSIZ] instead of struct ifreq works too.
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| 57 | * But just in case it's not true on some obscure arch... */
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| 58 | r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
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| 59 | if (r)
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| 60 | bb_perror_msg("can't bind to interface %s", iface);
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| 61 | return r;
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| 62 | }
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| 63 | #else
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| 64 | int FAST_FUNC setsockopt_bindtodevice(int fd UNUSED_PARAM,
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| 65 | const char *iface UNUSED_PARAM)
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| 66 | {
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| 67 | bb_error_msg("SO_BINDTODEVICE is not supported on this system");
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| 68 | return -1;
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| 69 | }
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| 70 | #endif
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| 71 |
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| 72 | static len_and_sockaddr* get_lsa(int fd, int (*get_name)(int fd, struct sockaddr *addr, socklen_t *addrlen))
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| 73 | {
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| 74 | len_and_sockaddr lsa;
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| 75 | len_and_sockaddr *lsa_ptr;
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| 76 |
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| 77 | lsa.len = LSA_SIZEOF_SA;
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| 78 | if (get_name(fd, &lsa.u.sa, &lsa.len) != 0)
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| 79 | return NULL;
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| 80 |
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| 81 | lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
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| 82 | if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
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| 83 | lsa_ptr->len = lsa.len;
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| 84 | get_name(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
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| 85 | } else {
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| 86 | memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
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| 87 | }
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| 88 | return lsa_ptr;
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| 89 | }
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| 90 |
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| 91 | len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
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| 92 | {
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| 93 | return get_lsa(fd, getsockname);
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| 94 | }
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| 95 |
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| 96 | len_and_sockaddr* FAST_FUNC get_peer_lsa(int fd)
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| 97 | {
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| 98 | return get_lsa(fd, getpeername);
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| 99 | }
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| 100 |
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| 101 | void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
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| 102 | {
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[1765] | 103 | if (connect(s, s_addr, addrlen) < 0) {
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| 104 | if (ENABLE_FEATURE_CLEAN_UP)
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| 105 | close(s);
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| 106 | if (s_addr->sa_family == AF_INET)
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| 107 | bb_perror_msg_and_die("%s (%s)",
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[2725] | 108 | "can't connect to remote host",
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[1765] | 109 | inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
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[2725] | 110 | bb_perror_msg_and_die("can't connect to remote host");
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[1765] | 111 | }
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| 112 | }
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| 113 |
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| 114 | /* Return port number for a service.
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[821] | 115 | * If "port" is a number use it as the port.
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[2725] | 116 | * If "port" is a name it is looked up in /etc/services,
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| 117 | * if it isnt found return default_port
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| 118 | */
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| 119 | unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
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[821] | 120 | {
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[1765] | 121 | unsigned port_nr = default_port;
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[821] | 122 | if (port) {
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| 123 | int old_errno;
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| 124 |
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| 125 | /* Since this is a lib function, we're not allowed to reset errno to 0.
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| 126 | * Doing so could break an app that is deferring checking of errno. */
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| 127 | old_errno = errno;
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[1765] | 128 | port_nr = bb_strtou(port, NULL, 10);
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| 129 | if (errno || port_nr > 65535) {
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[821] | 130 | struct servent *tserv = getservbyname(port, protocol);
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[1765] | 131 | port_nr = default_port;
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| 132 | if (tserv)
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| 133 | port_nr = ntohs(tserv->s_port);
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[821] | 134 | }
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| 135 | errno = old_errno;
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| 136 | }
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[1765] | 137 | return (uint16_t)port_nr;
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[821] | 138 | }
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| 139 |
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[1765] | 140 |
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| 141 | /* "New" networking API */
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| 142 |
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| 143 |
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[2725] | 144 | int FAST_FUNC get_nport(const struct sockaddr *sa)
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[1765] | 145 | {
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| 146 | #if ENABLE_FEATURE_IPV6
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| 147 | if (sa->sa_family == AF_INET6) {
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| 148 | return ((struct sockaddr_in6*)sa)->sin6_port;
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| 149 | }
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| 150 | #endif
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| 151 | if (sa->sa_family == AF_INET) {
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| 152 | return ((struct sockaddr_in*)sa)->sin_port;
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| 153 | }
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| 154 | /* What? UNIX socket? IPX?? :) */
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| 155 | return -1;
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| 156 | }
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| 157 |
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[3232] | 158 | void FAST_FUNC set_nport(struct sockaddr *sa, unsigned port)
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[1765] | 159 | {
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| 160 | #if ENABLE_FEATURE_IPV6
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[3232] | 161 | if (sa->sa_family == AF_INET6) {
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| 162 | struct sockaddr_in6 *sin6 = (void*) sa;
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| 163 | sin6->sin6_port = port;
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[1765] | 164 | return;
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| 165 | }
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| 166 | #endif
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[3232] | 167 | if (sa->sa_family == AF_INET) {
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| 168 | struct sockaddr_in *sin = (void*) sa;
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| 169 | sin->sin_port = port;
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[1765] | 170 | return;
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| 171 | }
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| 172 | /* What? UNIX socket? IPX?? :) */
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| 173 | }
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| 174 |
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| 175 | /* We hijack this constant to mean something else */
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| 176 | /* It doesn't hurt because we will remove this bit anyway */
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| 177 | #define DIE_ON_ERROR AI_CANONNAME
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| 178 |
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| 179 | /* host: "1.2.3.4[:port]", "www.google.com[:port]"
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| 180 | * port: if neither of above specifies port # */
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| 181 | static len_and_sockaddr* str2sockaddr(
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| 182 | const char *host, int port,
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[2725] | 183 | IF_FEATURE_IPV6(sa_family_t af,)
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[1765] | 184 | int ai_flags)
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| 185 | {
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[2725] | 186 | IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
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[1765] | 187 | int rc;
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[2725] | 188 | len_and_sockaddr *r;
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[1765] | 189 | struct addrinfo *result = NULL;
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[2725] | 190 | struct addrinfo *used_res;
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[1765] | 191 | const char *org_host = host; /* only for error msg */
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| 192 | const char *cp;
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| 193 | struct addrinfo hint;
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| 194 |
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[3621] | 195 | if (ENABLE_FEATURE_UNIX_LOCAL && is_prefixed_with(host, "local:")) {
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[2725] | 196 | struct sockaddr_un *sun;
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| 197 |
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| 198 | r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
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| 199 | r->len = sizeof(struct sockaddr_un);
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| 200 | r->u.sa.sa_family = AF_UNIX;
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| 201 | sun = (struct sockaddr_un *)&r->u.sa;
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| 202 | safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
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| 203 | return r;
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| 204 | }
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| 205 |
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| 206 | r = NULL;
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| 207 |
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[1765] | 208 | /* Ugly parsing of host:addr */
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| 209 | if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
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[2725] | 210 | /* Even uglier parsing of [xx]:nn */
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[1765] | 211 | host++;
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| 212 | cp = strchr(host, ']');
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[2725] | 213 | if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
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| 214 | /* Malformed: must be [xx]:nn or [xx] */
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| 215 | bb_error_msg("bad address '%s'", org_host);
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| 216 | if (ai_flags & DIE_ON_ERROR)
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| 217 | xfunc_die();
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| 218 | return NULL;
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| 219 | }
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[1765] | 220 | } else {
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| 221 | cp = strrchr(host, ':');
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| 222 | if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
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| 223 | /* There is more than one ':' (e.g. "::1") */
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| 224 | cp = NULL; /* it's not a port spec */
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| 225 | }
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| 226 | }
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[2725] | 227 | if (cp) { /* points to ":" or "]:" */
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[1765] | 228 | int sz = cp - host + 1;
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[2725] | 229 |
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[1765] | 230 | host = safe_strncpy(alloca(sz), host, sz);
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[2725] | 231 | if (ENABLE_FEATURE_IPV6 && *cp != ':') {
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[1765] | 232 | cp++; /* skip ']' */
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[2725] | 233 | if (*cp == '\0') /* [xx] without port */
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| 234 | goto skip;
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| 235 | }
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[1765] | 236 | cp++; /* skip ':' */
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[2725] | 237 | port = bb_strtou(cp, NULL, 10);
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| 238 | if (errno || (unsigned)port > 0xffff) {
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| 239 | bb_error_msg("bad port spec '%s'", org_host);
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| 240 | if (ai_flags & DIE_ON_ERROR)
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| 241 | xfunc_die();
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| 242 | return NULL;
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| 243 | }
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| 244 | skip: ;
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[1765] | 245 | }
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| 246 |
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[2725] | 247 | /* Next two if blocks allow to skip getaddrinfo()
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| 248 | * in case host name is a numeric IP(v6) address.
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| 249 | * getaddrinfo() initializes DNS resolution machinery,
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| 250 | * scans network config and such - tens of syscalls.
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| 251 | */
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| 252 | /* If we were not asked specifically for IPv6,
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| 253 | * check whether this is a numeric IPv4 */
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| 254 | IF_FEATURE_IPV6(if(af != AF_INET6)) {
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| 255 | struct in_addr in4;
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| 256 | if (inet_aton(host, &in4) != 0) {
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| 257 | r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
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| 258 | r->len = sizeof(struct sockaddr_in);
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| 259 | r->u.sa.sa_family = AF_INET;
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| 260 | r->u.sin.sin_addr = in4;
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| 261 | goto set_port;
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| 262 | }
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| 263 | }
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| 264 | #if ENABLE_FEATURE_IPV6
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| 265 | /* If we were not asked specifically for IPv4,
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| 266 | * check whether this is a numeric IPv6 */
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| 267 | if (af != AF_INET) {
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| 268 | struct in6_addr in6;
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| 269 | if (inet_pton(AF_INET6, host, &in6) > 0) {
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| 270 | r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
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| 271 | r->len = sizeof(struct sockaddr_in6);
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| 272 | r->u.sa.sa_family = AF_INET6;
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| 273 | r->u.sin6.sin6_addr = in6;
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| 274 | goto set_port;
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| 275 | }
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| 276 | }
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| 277 | #endif
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| 278 |
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[1765] | 279 | memset(&hint, 0 , sizeof(hint));
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| 280 | hint.ai_family = af;
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[3232] | 281 | /* Need SOCK_STREAM, or else we get each address thrice (or more)
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[1765] | 282 | * for each possible socket type (tcp,udp,raw...): */
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| 283 | hint.ai_socktype = SOCK_STREAM;
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| 284 | hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
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| 285 | rc = getaddrinfo(host, NULL, &hint, &result);
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| 286 | if (rc || !result) {
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| 287 | bb_error_msg("bad address '%s'", org_host);
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| 288 | if (ai_flags & DIE_ON_ERROR)
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| 289 | xfunc_die();
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| 290 | goto ret;
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| 291 | }
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[2725] | 292 | used_res = result;
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| 293 | #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
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| 294 | while (1) {
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| 295 | if (used_res->ai_family == AF_INET)
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| 296 | break;
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| 297 | used_res = used_res->ai_next;
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| 298 | if (!used_res) {
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| 299 | used_res = result;
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| 300 | break;
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| 301 | }
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| 302 | }
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| 303 | #endif
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| 304 | r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
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| 305 | r->len = used_res->ai_addrlen;
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| 306 | memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
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| 307 |
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| 308 | set_port:
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[3232] | 309 | set_nport(&r->u.sa, htons(port));
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[1765] | 310 | ret:
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[3232] | 311 | if (result)
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| 312 | freeaddrinfo(result);
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[1765] | 313 | return r;
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| 314 | }
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| 315 | #if !ENABLE_FEATURE_IPV6
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| 316 | #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
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| 317 | #endif
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| 318 |
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| 319 | #if ENABLE_FEATURE_IPV6
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[2725] | 320 | len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
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[1765] | 321 | {
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| 322 | return str2sockaddr(host, port, af, 0);
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| 323 | }
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| 324 |
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[2725] | 325 | len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
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[1765] | 326 | {
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| 327 | return str2sockaddr(host, port, af, DIE_ON_ERROR);
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| 328 | }
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| 329 | #endif
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| 330 |
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[2725] | 331 | len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
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[1765] | 332 | {
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| 333 | return str2sockaddr(host, port, AF_UNSPEC, 0);
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| 334 | }
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| 335 |
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[2725] | 336 | len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
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[1765] | 337 | {
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| 338 | return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
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| 339 | }
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| 340 |
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[2725] | 341 | len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
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[1765] | 342 | {
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| 343 | return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
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| 344 | }
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| 345 |
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[3232] | 346 | int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, int family, int sock_type)
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[1765] | 347 | {
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| 348 | len_and_sockaddr *lsa;
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| 349 | int fd;
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| 350 | int len;
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| 351 |
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[3232] | 352 | if (family == AF_UNSPEC) {
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[1765] | 353 | #if ENABLE_FEATURE_IPV6
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| 354 | fd = socket(AF_INET6, sock_type, 0);
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| 355 | if (fd >= 0) {
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| 356 | family = AF_INET6;
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| 357 | goto done;
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| 358 | }
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[3232] | 359 | #endif
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[1765] | 360 | family = AF_INET;
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| 361 | }
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[3232] | 362 |
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[1765] | 363 | fd = xsocket(family, sock_type, 0);
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[3232] | 364 |
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[1765] | 365 | len = sizeof(struct sockaddr_in);
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[3232] | 366 | if (family == AF_UNIX)
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| 367 | len = sizeof(struct sockaddr_un);
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[1765] | 368 | #if ENABLE_FEATURE_IPV6
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| 369 | if (family == AF_INET6) {
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| 370 | done:
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| 371 | len = sizeof(struct sockaddr_in6);
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| 372 | }
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| 373 | #endif
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[2725] | 374 | lsa = xzalloc(LSA_LEN_SIZE + len);
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[1765] | 375 | lsa->len = len;
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[2725] | 376 | lsa->u.sa.sa_family = family;
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[1765] | 377 | *lsap = lsa;
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| 378 | return fd;
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| 379 | }
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| 380 |
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[2725] | 381 | int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
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[1765] | 382 | {
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[3232] | 383 | return xsocket_type(lsap, AF_UNSPEC, SOCK_STREAM);
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[1765] | 384 | }
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| 385 |
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| 386 | static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
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| 387 | {
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| 388 | int fd;
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| 389 | len_and_sockaddr *lsa;
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| 390 |
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| 391 | if (bindaddr && bindaddr[0]) {
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| 392 | lsa = xdotted2sockaddr(bindaddr, port);
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| 393 | /* user specified bind addr dictates family */
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[2725] | 394 | fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
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[1765] | 395 | } else {
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[3232] | 396 | fd = xsocket_type(&lsa, AF_UNSPEC, sock_type);
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| 397 | set_nport(&lsa->u.sa, htons(port));
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[1765] | 398 | }
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| 399 | setsockopt_reuseaddr(fd);
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[2725] | 400 | xbind(fd, &lsa->u.sa, lsa->len);
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[1765] | 401 | free(lsa);
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| 402 | return fd;
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| 403 | }
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| 404 |
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[2725] | 405 | int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
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[1765] | 406 | {
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| 407 | return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
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| 408 | }
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| 409 |
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[2725] | 410 | int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
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[1765] | 411 | {
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| 412 | return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
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| 413 | }
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| 414 |
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| 415 |
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[2725] | 416 | int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
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[1765] | 417 | {
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| 418 | int fd;
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| 419 | len_and_sockaddr *lsa;
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| 420 |
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| 421 | lsa = xhost2sockaddr(peer, port);
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[2725] | 422 | fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
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[1765] | 423 | setsockopt_reuseaddr(fd);
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[2725] | 424 | xconnect(fd, &lsa->u.sa, lsa->len);
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[1765] | 425 | free(lsa);
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| 426 | return fd;
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| 427 | }
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| 428 |
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[2725] | 429 | int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
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[1765] | 430 | {
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[2725] | 431 | int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
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| 432 | xconnect(fd, &lsa->u.sa, lsa->len);
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[1765] | 433 | return fd;
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| 434 | }
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| 435 |
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| 436 | /* We hijack this constant to mean something else */
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| 437 | /* It doesn't hurt because we will add this bit anyway */
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| 438 | #define IGNORE_PORT NI_NUMERICSERV
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[2725] | 439 | static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
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[1765] | 440 | {
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| 441 | char host[128];
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| 442 | char serv[16];
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| 443 | int rc;
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| 444 | socklen_t salen;
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| 445 |
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[2725] | 446 | if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
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| 447 | struct sockaddr_un *sun = (struct sockaddr_un *)sa;
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| 448 | return xasprintf("local:%.*s",
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| 449 | (int) sizeof(sun->sun_path),
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| 450 | sun->sun_path);
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| 451 | }
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| 452 |
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[1765] | 453 | salen = LSA_SIZEOF_SA;
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| 454 | #if ENABLE_FEATURE_IPV6
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| 455 | if (sa->sa_family == AF_INET)
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| 456 | salen = sizeof(struct sockaddr_in);
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| 457 | if (sa->sa_family == AF_INET6)
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| 458 | salen = sizeof(struct sockaddr_in6);
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| 459 | #endif
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| 460 | rc = getnameinfo(sa, salen,
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| 461 | host, sizeof(host),
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| 462 | /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
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| 463 | serv, sizeof(serv),
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| 464 | /* do not resolve port# into service _name_ */
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| 465 | flags | NI_NUMERICSERV
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| 466 | );
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| 467 | if (rc)
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| 468 | return NULL;
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| 469 | if (flags & IGNORE_PORT)
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| 470 | return xstrdup(host);
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| 471 | #if ENABLE_FEATURE_IPV6
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| 472 | if (sa->sa_family == AF_INET6) {
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| 473 | if (strchr(host, ':')) /* heh, it's not a resolved hostname */
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| 474 | return xasprintf("[%s]:%s", host, serv);
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| 475 | /*return xasprintf("%s:%s", host, serv);*/
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| 476 | /* - fall through instead */
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| 477 | }
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| 478 | #endif
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| 479 | /* For now we don't support anything else, so it has to be INET */
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| 480 | /*if (sa->sa_family == AF_INET)*/
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| 481 | return xasprintf("%s:%s", host, serv);
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| 482 | /*return xstrdup(host);*/
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| 483 | }
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| 484 |
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[2725] | 485 | char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
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[1765] | 486 | {
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| 487 | return sockaddr2str(sa, 0);
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| 488 | }
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| 489 |
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[2725] | 490 | char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
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[1765] | 491 | {
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| 492 | return sockaddr2str(sa, IGNORE_PORT);
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| 493 | }
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| 494 |
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[2725] | 495 | char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
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[1765] | 496 | {
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| 497 | return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
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| 498 | }
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[2725] | 499 | char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
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[1765] | 500 | {
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| 501 | return sockaddr2str(sa, NI_NUMERICHOST);
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| 502 | }
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| 503 |
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[2725] | 504 | char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
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[1765] | 505 | {
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| 506 | return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
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| 507 | }
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