[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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[2725] | 17 | void FAST_FUNC setsockopt_reuseaddr(int fd)
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[1765] | 18 | {
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| 19 | setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, &const_int_1, sizeof(const_int_1));
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| 20 | }
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[2725] | 21 | int FAST_FUNC setsockopt_broadcast(int fd)
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[1765] | 22 | {
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| 23 | return setsockopt(fd, SOL_SOCKET, SO_BROADCAST, &const_int_1, sizeof(const_int_1));
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| 24 | }
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| 25 |
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[2725] | 26 | #ifdef SO_BINDTODEVICE
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| 27 | int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
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[1765] | 28 | {
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[2725] | 29 | int r;
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| 30 | struct ifreq ifr;
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| 31 | strncpy_IFNAMSIZ(ifr.ifr_name, iface);
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| 32 | /* NB: passing (iface, strlen(iface) + 1) does not work!
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| 33 | * (maybe it works on _some_ kernels, but not on 2.6.26)
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| 34 | * Actually, ifr_name is at offset 0, and in practice
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| 35 | * just giving char[IFNAMSIZ] instead of struct ifreq works too.
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| 36 | * But just in case it's not true on some obscure arch... */
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| 37 | r = setsockopt(fd, SOL_SOCKET, SO_BINDTODEVICE, &ifr, sizeof(ifr));
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| 38 | if (r)
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| 39 | bb_perror_msg("can't bind to interface %s", iface);
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| 40 | return r;
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| 41 | }
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| 42 | #else
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| 43 | int FAST_FUNC setsockopt_bindtodevice(int fd UNUSED_PARAM,
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| 44 | const char *iface UNUSED_PARAM)
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| 45 | {
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| 46 | bb_error_msg("SO_BINDTODEVICE is not supported on this system");
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| 47 | return -1;
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| 48 | }
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| 49 | #endif
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| 50 |
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| 51 | static len_and_sockaddr* get_lsa(int fd, int (*get_name)(int fd, struct sockaddr *addr, socklen_t *addrlen))
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| 52 | {
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| 53 | len_and_sockaddr lsa;
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| 54 | len_and_sockaddr *lsa_ptr;
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| 55 |
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| 56 | lsa.len = LSA_SIZEOF_SA;
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| 57 | if (get_name(fd, &lsa.u.sa, &lsa.len) != 0)
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| 58 | return NULL;
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| 59 |
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| 60 | lsa_ptr = xzalloc(LSA_LEN_SIZE + lsa.len);
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| 61 | if (lsa.len > LSA_SIZEOF_SA) { /* rarely (if ever) happens */
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| 62 | lsa_ptr->len = lsa.len;
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| 63 | get_name(fd, &lsa_ptr->u.sa, &lsa_ptr->len);
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| 64 | } else {
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| 65 | memcpy(lsa_ptr, &lsa, LSA_LEN_SIZE + lsa.len);
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| 66 | }
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| 67 | return lsa_ptr;
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| 68 | }
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| 69 |
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| 70 | len_and_sockaddr* FAST_FUNC get_sock_lsa(int fd)
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| 71 | {
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| 72 | return get_lsa(fd, getsockname);
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| 73 | }
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| 74 |
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| 75 | len_and_sockaddr* FAST_FUNC get_peer_lsa(int fd)
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| 76 | {
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| 77 | return get_lsa(fd, getpeername);
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| 78 | }
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| 79 |
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| 80 | void FAST_FUNC xconnect(int s, const struct sockaddr *s_addr, socklen_t addrlen)
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| 81 | {
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[1765] | 82 | if (connect(s, s_addr, addrlen) < 0) {
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| 83 | if (ENABLE_FEATURE_CLEAN_UP)
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| 84 | close(s);
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| 85 | if (s_addr->sa_family == AF_INET)
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| 86 | bb_perror_msg_and_die("%s (%s)",
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[2725] | 87 | "can't connect to remote host",
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[1765] | 88 | inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
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[2725] | 89 | bb_perror_msg_and_die("can't connect to remote host");
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[1765] | 90 | }
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| 91 | }
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| 92 |
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| 93 | /* Return port number for a service.
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[821] | 94 | * If "port" is a number use it as the port.
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[2725] | 95 | * If "port" is a name it is looked up in /etc/services,
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| 96 | * if it isnt found return default_port
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| 97 | */
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| 98 | unsigned FAST_FUNC bb_lookup_port(const char *port, const char *protocol, unsigned default_port)
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[821] | 99 | {
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[1765] | 100 | unsigned port_nr = default_port;
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[821] | 101 | if (port) {
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| 102 | int old_errno;
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| 103 |
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| 104 | /* Since this is a lib function, we're not allowed to reset errno to 0.
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| 105 | * Doing so could break an app that is deferring checking of errno. */
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| 106 | old_errno = errno;
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[1765] | 107 | port_nr = bb_strtou(port, NULL, 10);
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| 108 | if (errno || port_nr > 65535) {
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[821] | 109 | struct servent *tserv = getservbyname(port, protocol);
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[1765] | 110 | port_nr = default_port;
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| 111 | if (tserv)
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| 112 | port_nr = ntohs(tserv->s_port);
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[821] | 113 | }
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| 114 | errno = old_errno;
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| 115 | }
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[1765] | 116 | return (uint16_t)port_nr;
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[821] | 117 | }
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| 118 |
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[1765] | 119 |
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| 120 | /* "New" networking API */
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| 121 |
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| 122 |
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[2725] | 123 | int FAST_FUNC get_nport(const struct sockaddr *sa)
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[1765] | 124 | {
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| 125 | #if ENABLE_FEATURE_IPV6
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| 126 | if (sa->sa_family == AF_INET6) {
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| 127 | return ((struct sockaddr_in6*)sa)->sin6_port;
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| 128 | }
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| 129 | #endif
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| 130 | if (sa->sa_family == AF_INET) {
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| 131 | return ((struct sockaddr_in*)sa)->sin_port;
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| 132 | }
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| 133 | /* What? UNIX socket? IPX?? :) */
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| 134 | return -1;
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| 135 | }
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| 136 |
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[2725] | 137 | void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
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[1765] | 138 | {
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| 139 | #if ENABLE_FEATURE_IPV6
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[2725] | 140 | if (lsa->u.sa.sa_family == AF_INET6) {
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| 141 | lsa->u.sin6.sin6_port = port;
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[1765] | 142 | return;
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| 143 | }
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| 144 | #endif
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[2725] | 145 | if (lsa->u.sa.sa_family == AF_INET) {
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| 146 | lsa->u.sin.sin_port = port;
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[1765] | 147 | return;
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| 148 | }
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| 149 | /* What? UNIX socket? IPX?? :) */
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| 150 | }
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| 151 |
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| 152 | /* We hijack this constant to mean something else */
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| 153 | /* It doesn't hurt because we will remove this bit anyway */
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| 154 | #define DIE_ON_ERROR AI_CANONNAME
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| 155 |
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| 156 | /* host: "1.2.3.4[:port]", "www.google.com[:port]"
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| 157 | * port: if neither of above specifies port # */
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| 158 | static len_and_sockaddr* str2sockaddr(
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| 159 | const char *host, int port,
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[2725] | 160 | IF_FEATURE_IPV6(sa_family_t af,)
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[1765] | 161 | int ai_flags)
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| 162 | {
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[2725] | 163 | IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
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[1765] | 164 | int rc;
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[2725] | 165 | len_and_sockaddr *r;
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[1765] | 166 | struct addrinfo *result = NULL;
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[2725] | 167 | struct addrinfo *used_res;
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[1765] | 168 | const char *org_host = host; /* only for error msg */
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| 169 | const char *cp;
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| 170 | struct addrinfo hint;
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| 171 |
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[2725] | 172 | if (ENABLE_FEATURE_UNIX_LOCAL && strncmp(host, "local:", 6) == 0) {
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| 173 | struct sockaddr_un *sun;
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| 174 |
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| 175 | r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_un));
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| 176 | r->len = sizeof(struct sockaddr_un);
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| 177 | r->u.sa.sa_family = AF_UNIX;
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| 178 | sun = (struct sockaddr_un *)&r->u.sa;
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| 179 | safe_strncpy(sun->sun_path, host + 6, sizeof(sun->sun_path));
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| 180 | return r;
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| 181 | }
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| 182 |
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| 183 | r = NULL;
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| 184 |
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[1765] | 185 | /* Ugly parsing of host:addr */
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| 186 | if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
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[2725] | 187 | /* Even uglier parsing of [xx]:nn */
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[1765] | 188 | host++;
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| 189 | cp = strchr(host, ']');
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[2725] | 190 | if (!cp || (cp[1] != ':' && cp[1] != '\0')) {
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| 191 | /* Malformed: must be [xx]:nn or [xx] */
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| 192 | bb_error_msg("bad address '%s'", org_host);
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| 193 | if (ai_flags & DIE_ON_ERROR)
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| 194 | xfunc_die();
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| 195 | return NULL;
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| 196 | }
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[1765] | 197 | } else {
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| 198 | cp = strrchr(host, ':');
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| 199 | if (ENABLE_FEATURE_IPV6 && cp && strchr(host, ':') != cp) {
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| 200 | /* There is more than one ':' (e.g. "::1") */
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| 201 | cp = NULL; /* it's not a port spec */
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| 202 | }
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| 203 | }
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[2725] | 204 | if (cp) { /* points to ":" or "]:" */
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[1765] | 205 | int sz = cp - host + 1;
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[2725] | 206 |
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[1765] | 207 | host = safe_strncpy(alloca(sz), host, sz);
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[2725] | 208 | if (ENABLE_FEATURE_IPV6 && *cp != ':') {
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[1765] | 209 | cp++; /* skip ']' */
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[2725] | 210 | if (*cp == '\0') /* [xx] without port */
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| 211 | goto skip;
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| 212 | }
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[1765] | 213 | cp++; /* skip ':' */
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[2725] | 214 | port = bb_strtou(cp, NULL, 10);
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| 215 | if (errno || (unsigned)port > 0xffff) {
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| 216 | bb_error_msg("bad port spec '%s'", org_host);
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| 217 | if (ai_flags & DIE_ON_ERROR)
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| 218 | xfunc_die();
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| 219 | return NULL;
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| 220 | }
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| 221 | skip: ;
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[1765] | 222 | }
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| 223 |
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[2725] | 224 | /* Next two if blocks allow to skip getaddrinfo()
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| 225 | * in case host name is a numeric IP(v6) address.
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| 226 | * getaddrinfo() initializes DNS resolution machinery,
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| 227 | * scans network config and such - tens of syscalls.
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| 228 | */
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| 229 | /* If we were not asked specifically for IPv6,
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| 230 | * check whether this is a numeric IPv4 */
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| 231 | IF_FEATURE_IPV6(if(af != AF_INET6)) {
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| 232 | struct in_addr in4;
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| 233 | if (inet_aton(host, &in4) != 0) {
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| 234 | r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in));
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| 235 | r->len = sizeof(struct sockaddr_in);
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| 236 | r->u.sa.sa_family = AF_INET;
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| 237 | r->u.sin.sin_addr = in4;
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| 238 | goto set_port;
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| 239 | }
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| 240 | }
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| 241 | #if ENABLE_FEATURE_IPV6
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| 242 | /* If we were not asked specifically for IPv4,
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| 243 | * check whether this is a numeric IPv6 */
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| 244 | if (af != AF_INET) {
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| 245 | struct in6_addr in6;
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| 246 | if (inet_pton(AF_INET6, host, &in6) > 0) {
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| 247 | r = xzalloc(LSA_LEN_SIZE + sizeof(struct sockaddr_in6));
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| 248 | r->len = sizeof(struct sockaddr_in6);
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| 249 | r->u.sa.sa_family = AF_INET6;
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| 250 | r->u.sin6.sin6_addr = in6;
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| 251 | goto set_port;
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| 252 | }
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| 253 | }
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| 254 | #endif
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| 255 |
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[1765] | 256 | memset(&hint, 0 , sizeof(hint));
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| 257 | hint.ai_family = af;
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| 258 | /* Needed. Or else we will get each address thrice (or more)
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| 259 | * for each possible socket type (tcp,udp,raw...): */
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| 260 | hint.ai_socktype = SOCK_STREAM;
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| 261 | hint.ai_flags = ai_flags & ~DIE_ON_ERROR;
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| 262 | rc = getaddrinfo(host, NULL, &hint, &result);
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| 263 | if (rc || !result) {
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| 264 | bb_error_msg("bad address '%s'", org_host);
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| 265 | if (ai_flags & DIE_ON_ERROR)
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| 266 | xfunc_die();
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| 267 | goto ret;
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| 268 | }
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[2725] | 269 | used_res = result;
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| 270 | #if ENABLE_FEATURE_PREFER_IPV4_ADDRESS
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| 271 | while (1) {
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| 272 | if (used_res->ai_family == AF_INET)
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| 273 | break;
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| 274 | used_res = used_res->ai_next;
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| 275 | if (!used_res) {
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| 276 | used_res = result;
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| 277 | break;
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| 278 | }
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| 279 | }
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| 280 | #endif
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| 281 | r = xmalloc(LSA_LEN_SIZE + used_res->ai_addrlen);
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| 282 | r->len = used_res->ai_addrlen;
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| 283 | memcpy(&r->u.sa, used_res->ai_addr, used_res->ai_addrlen);
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| 284 |
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| 285 | set_port:
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[1765] | 286 | set_nport(r, htons(port));
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| 287 | ret:
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| 288 | freeaddrinfo(result);
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| 289 | return r;
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| 290 | }
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| 291 | #if !ENABLE_FEATURE_IPV6
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| 292 | #define str2sockaddr(host, port, af, ai_flags) str2sockaddr(host, port, ai_flags)
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| 293 | #endif
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| 294 |
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| 295 | #if ENABLE_FEATURE_IPV6
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[2725] | 296 | len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
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[1765] | 297 | {
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| 298 | return str2sockaddr(host, port, af, 0);
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| 299 | }
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| 300 |
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[2725] | 301 | len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
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[1765] | 302 | {
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| 303 | return str2sockaddr(host, port, af, DIE_ON_ERROR);
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| 304 | }
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| 305 | #endif
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| 306 |
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[2725] | 307 | len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
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[1765] | 308 | {
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| 309 | return str2sockaddr(host, port, AF_UNSPEC, 0);
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| 310 | }
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| 311 |
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[2725] | 312 | len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
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[1765] | 313 | {
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| 314 | return str2sockaddr(host, port, AF_UNSPEC, DIE_ON_ERROR);
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| 315 | }
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| 316 |
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[2725] | 317 | len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
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[1765] | 318 | {
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| 319 | return str2sockaddr(host, port, AF_UNSPEC, AI_NUMERICHOST | DIE_ON_ERROR);
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| 320 | }
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| 321 |
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[2725] | 322 | #undef xsocket_type
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| 323 | int FAST_FUNC xsocket_type(len_and_sockaddr **lsap, IF_FEATURE_IPV6(int family,) int sock_type)
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[1765] | 324 | {
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[2725] | 325 | IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
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[1765] | 326 | len_and_sockaddr *lsa;
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| 327 | int fd;
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| 328 | int len;
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| 329 |
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| 330 | #if ENABLE_FEATURE_IPV6
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| 331 | if (family == AF_UNSPEC) {
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| 332 | fd = socket(AF_INET6, sock_type, 0);
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| 333 | if (fd >= 0) {
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| 334 | family = AF_INET6;
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| 335 | goto done;
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| 336 | }
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| 337 | family = AF_INET;
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| 338 | }
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| 339 | #endif
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| 340 | fd = xsocket(family, sock_type, 0);
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| 341 | len = sizeof(struct sockaddr_in);
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| 342 | #if ENABLE_FEATURE_IPV6
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| 343 | if (family == AF_INET6) {
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| 344 | done:
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| 345 | len = sizeof(struct sockaddr_in6);
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| 346 | }
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| 347 | #endif
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[2725] | 348 | lsa = xzalloc(LSA_LEN_SIZE + len);
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[1765] | 349 | lsa->len = len;
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[2725] | 350 | lsa->u.sa.sa_family = family;
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[1765] | 351 | *lsap = lsa;
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| 352 | return fd;
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| 353 | }
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| 354 |
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[2725] | 355 | int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
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[1765] | 356 | {
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[2725] | 357 | return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
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[1765] | 358 | }
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| 359 |
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| 360 | static int create_and_bind_or_die(const char *bindaddr, int port, int sock_type)
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| 361 | {
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| 362 | int fd;
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| 363 | len_and_sockaddr *lsa;
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| 364 |
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| 365 | if (bindaddr && bindaddr[0]) {
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| 366 | lsa = xdotted2sockaddr(bindaddr, port);
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| 367 | /* user specified bind addr dictates family */
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[2725] | 368 | fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
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[1765] | 369 | } else {
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[2725] | 370 | fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
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[1765] | 371 | set_nport(lsa, htons(port));
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| 372 | }
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| 373 | setsockopt_reuseaddr(fd);
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[2725] | 374 | xbind(fd, &lsa->u.sa, lsa->len);
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[1765] | 375 | free(lsa);
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| 376 | return fd;
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| 377 | }
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| 378 |
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[2725] | 379 | int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
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[1765] | 380 | {
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| 381 | return create_and_bind_or_die(bindaddr, port, SOCK_STREAM);
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| 382 | }
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| 383 |
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[2725] | 384 | int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
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[1765] | 385 | {
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| 386 | return create_and_bind_or_die(bindaddr, port, SOCK_DGRAM);
|
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| 387 | }
|
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| 388 |
|
---|
| 389 |
|
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[2725] | 390 | int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
|
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[1765] | 391 | {
|
---|
| 392 | int fd;
|
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| 393 | len_and_sockaddr *lsa;
|
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| 394 |
|
---|
| 395 | lsa = xhost2sockaddr(peer, port);
|
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[2725] | 396 | fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
|
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[1765] | 397 | setsockopt_reuseaddr(fd);
|
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[2725] | 398 | xconnect(fd, &lsa->u.sa, lsa->len);
|
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[1765] | 399 | free(lsa);
|
---|
| 400 | return fd;
|
---|
| 401 | }
|
---|
| 402 |
|
---|
[2725] | 403 | int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
|
---|
[1765] | 404 | {
|
---|
[2725] | 405 | int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
|
---|
| 406 | xconnect(fd, &lsa->u.sa, lsa->len);
|
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[1765] | 407 | return fd;
|
---|
| 408 | }
|
---|
| 409 |
|
---|
| 410 | /* We hijack this constant to mean something else */
|
---|
| 411 | /* It doesn't hurt because we will add this bit anyway */
|
---|
| 412 | #define IGNORE_PORT NI_NUMERICSERV
|
---|
[2725] | 413 | static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
|
---|
[1765] | 414 | {
|
---|
| 415 | char host[128];
|
---|
| 416 | char serv[16];
|
---|
| 417 | int rc;
|
---|
| 418 | socklen_t salen;
|
---|
| 419 |
|
---|
[2725] | 420 | if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
|
---|
| 421 | struct sockaddr_un *sun = (struct sockaddr_un *)sa;
|
---|
| 422 | return xasprintf("local:%.*s",
|
---|
| 423 | (int) sizeof(sun->sun_path),
|
---|
| 424 | sun->sun_path);
|
---|
| 425 | }
|
---|
| 426 |
|
---|
[1765] | 427 | salen = LSA_SIZEOF_SA;
|
---|
| 428 | #if ENABLE_FEATURE_IPV6
|
---|
| 429 | if (sa->sa_family == AF_INET)
|
---|
| 430 | salen = sizeof(struct sockaddr_in);
|
---|
| 431 | if (sa->sa_family == AF_INET6)
|
---|
| 432 | salen = sizeof(struct sockaddr_in6);
|
---|
| 433 | #endif
|
---|
| 434 | rc = getnameinfo(sa, salen,
|
---|
| 435 | host, sizeof(host),
|
---|
| 436 | /* can do ((flags & IGNORE_PORT) ? NULL : serv) but why bother? */
|
---|
| 437 | serv, sizeof(serv),
|
---|
| 438 | /* do not resolve port# into service _name_ */
|
---|
| 439 | flags | NI_NUMERICSERV
|
---|
| 440 | );
|
---|
| 441 | if (rc)
|
---|
| 442 | return NULL;
|
---|
| 443 | if (flags & IGNORE_PORT)
|
---|
| 444 | return xstrdup(host);
|
---|
| 445 | #if ENABLE_FEATURE_IPV6
|
---|
| 446 | if (sa->sa_family == AF_INET6) {
|
---|
| 447 | if (strchr(host, ':')) /* heh, it's not a resolved hostname */
|
---|
| 448 | return xasprintf("[%s]:%s", host, serv);
|
---|
| 449 | /*return xasprintf("%s:%s", host, serv);*/
|
---|
| 450 | /* - fall through instead */
|
---|
| 451 | }
|
---|
| 452 | #endif
|
---|
| 453 | /* For now we don't support anything else, so it has to be INET */
|
---|
| 454 | /*if (sa->sa_family == AF_INET)*/
|
---|
| 455 | return xasprintf("%s:%s", host, serv);
|
---|
| 456 | /*return xstrdup(host);*/
|
---|
| 457 | }
|
---|
| 458 |
|
---|
[2725] | 459 | char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
|
---|
[1765] | 460 | {
|
---|
| 461 | return sockaddr2str(sa, 0);
|
---|
| 462 | }
|
---|
| 463 |
|
---|
[2725] | 464 | char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
|
---|
[1765] | 465 | {
|
---|
| 466 | return sockaddr2str(sa, IGNORE_PORT);
|
---|
| 467 | }
|
---|
| 468 |
|
---|
[2725] | 469 | char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
|
---|
[1765] | 470 | {
|
---|
| 471 | return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
|
---|
| 472 | }
|
---|
[2725] | 473 | char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
|
---|
[1765] | 474 | {
|
---|
| 475 | return sockaddr2str(sa, NI_NUMERICHOST);
|
---|
| 476 | }
|
---|
| 477 |
|
---|
[2725] | 478 | char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
|
---|
[1765] | 479 | {
|
---|
| 480 | return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
|
---|
| 481 | }
|
---|