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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7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | #include <sys/types.h>
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11 | #include <sys/socket.h> /* netinet/in.h needs it */
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12 | #include <netinet/in.h>
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13 | #include <net/if.h>
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14 | #include <sys/un.h>
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15 | #include "libbb.h"
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16 |
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17 | void FAST_FUNC setsockopt_reuseaddr(int fd)
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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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21 | int FAST_FUNC setsockopt_broadcast(int fd)
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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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26 | #ifdef SO_BINDTODEVICE
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27 | int FAST_FUNC setsockopt_bindtodevice(int fd, const char *iface)
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28 | {
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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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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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87 | "can't connect to remote host",
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88 | inet_ntoa(((struct sockaddr_in *)s_addr)->sin_addr));
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89 | bb_perror_msg_and_die("can't connect to remote host");
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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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94 | * If "port" is a number use it as the port.
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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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99 | {
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100 | unsigned port_nr = default_port;
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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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107 | port_nr = bb_strtou(port, NULL, 10);
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108 | if (errno || port_nr > 65535) {
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109 | struct servent *tserv = getservbyname(port, protocol);
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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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113 | }
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114 | errno = old_errno;
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115 | }
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116 | return (uint16_t)port_nr;
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117 | }
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118 |
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119 |
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120 | /* "New" networking API */
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121 |
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122 |
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123 | int FAST_FUNC get_nport(const struct sockaddr *sa)
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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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137 | void FAST_FUNC set_nport(len_and_sockaddr *lsa, unsigned port)
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138 | {
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139 | #if ENABLE_FEATURE_IPV6
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140 | if (lsa->u.sa.sa_family == AF_INET6) {
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141 | lsa->u.sin6.sin6_port = port;
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142 | return;
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143 | }
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144 | #endif
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145 | if (lsa->u.sa.sa_family == AF_INET) {
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146 | lsa->u.sin.sin_port = port;
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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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160 | IF_FEATURE_IPV6(sa_family_t af,)
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161 | int ai_flags)
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162 | {
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163 | IF_NOT_FEATURE_IPV6(sa_family_t af = AF_INET;)
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164 | int rc;
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165 | len_and_sockaddr *r;
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166 | struct addrinfo *result = NULL;
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167 | struct addrinfo *used_res;
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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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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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185 | /* Ugly parsing of host:addr */
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186 | if (ENABLE_FEATURE_IPV6 && host[0] == '[') {
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187 | /* Even uglier parsing of [xx]:nn */
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188 | host++;
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189 | cp = strchr(host, ']');
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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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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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204 | if (cp) { /* points to ":" or "]:" */
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205 | int sz = cp - host + 1;
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206 |
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207 | host = safe_strncpy(alloca(sz), host, sz);
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208 | if (ENABLE_FEATURE_IPV6 && *cp != ':') {
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209 | cp++; /* skip ']' */
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210 | if (*cp == '\0') /* [xx] without port */
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211 | goto skip;
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212 | }
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213 | cp++; /* skip ':' */
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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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222 | }
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223 |
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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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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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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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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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296 | len_and_sockaddr* FAST_FUNC host_and_af2sockaddr(const char *host, int port, sa_family_t af)
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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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301 | len_and_sockaddr* FAST_FUNC xhost_and_af2sockaddr(const char *host, int port, sa_family_t af)
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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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307 | len_and_sockaddr* FAST_FUNC host2sockaddr(const char *host, int port)
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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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312 | len_and_sockaddr* FAST_FUNC xhost2sockaddr(const char *host, int port)
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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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317 | len_and_sockaddr* FAST_FUNC xdotted2sockaddr(const char *host, int port)
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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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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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324 | {
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325 | IF_NOT_FEATURE_IPV6(enum { family = AF_INET };)
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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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348 | lsa = xzalloc(LSA_LEN_SIZE + len);
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349 | lsa->len = len;
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350 | lsa->u.sa.sa_family = family;
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351 | *lsap = lsa;
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352 | return fd;
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353 | }
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354 |
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355 | int FAST_FUNC xsocket_stream(len_and_sockaddr **lsap)
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356 | {
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357 | return xsocket_type(lsap, IF_FEATURE_IPV6(AF_UNSPEC,) SOCK_STREAM);
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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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368 | fd = xsocket(lsa->u.sa.sa_family, sock_type, 0);
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369 | } else {
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370 | fd = xsocket_type(&lsa, IF_FEATURE_IPV6(AF_UNSPEC,) sock_type);
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371 | set_nport(lsa, htons(port));
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372 | }
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373 | setsockopt_reuseaddr(fd);
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374 | xbind(fd, &lsa->u.sa, lsa->len);
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375 | free(lsa);
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376 | return fd;
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377 | }
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378 |
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379 | int FAST_FUNC create_and_bind_stream_or_die(const char *bindaddr, int port)
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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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384 | int FAST_FUNC create_and_bind_dgram_or_die(const char *bindaddr, int port)
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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 |
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389 |
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390 | int FAST_FUNC create_and_connect_stream_or_die(const char *peer, int port)
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391 | {
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392 | int fd;
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393 | len_and_sockaddr *lsa;
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394 |
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395 | lsa = xhost2sockaddr(peer, port);
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396 | fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
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397 | setsockopt_reuseaddr(fd);
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398 | xconnect(fd, &lsa->u.sa, lsa->len);
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399 | free(lsa);
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400 | return fd;
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401 | }
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402 |
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403 | int FAST_FUNC xconnect_stream(const len_and_sockaddr *lsa)
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404 | {
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405 | int fd = xsocket(lsa->u.sa.sa_family, SOCK_STREAM, 0);
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406 | xconnect(fd, &lsa->u.sa, lsa->len);
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407 | return fd;
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408 | }
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409 |
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410 | /* We hijack this constant to mean something else */
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411 | /* It doesn't hurt because we will add this bit anyway */
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412 | #define IGNORE_PORT NI_NUMERICSERV
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413 | static char* FAST_FUNC sockaddr2str(const struct sockaddr *sa, int flags)
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414 | {
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415 | char host[128];
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416 | char serv[16];
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417 | int rc;
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418 | socklen_t salen;
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419 |
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420 | if (ENABLE_FEATURE_UNIX_LOCAL && sa->sa_family == AF_UNIX) {
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421 | struct sockaddr_un *sun = (struct sockaddr_un *)sa;
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422 | return xasprintf("local:%.*s",
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423 | (int) sizeof(sun->sun_path),
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424 | sun->sun_path);
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425 | }
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426 |
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427 | salen = LSA_SIZEOF_SA;
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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 |
|
---|
459 | char* FAST_FUNC xmalloc_sockaddr2host(const struct sockaddr *sa)
|
---|
460 | {
|
---|
461 | return sockaddr2str(sa, 0);
|
---|
462 | }
|
---|
463 |
|
---|
464 | char* FAST_FUNC xmalloc_sockaddr2host_noport(const struct sockaddr *sa)
|
---|
465 | {
|
---|
466 | return sockaddr2str(sa, IGNORE_PORT);
|
---|
467 | }
|
---|
468 |
|
---|
469 | char* FAST_FUNC xmalloc_sockaddr2hostonly_noport(const struct sockaddr *sa)
|
---|
470 | {
|
---|
471 | return sockaddr2str(sa, NI_NAMEREQD | IGNORE_PORT);
|
---|
472 | }
|
---|
473 | char* FAST_FUNC xmalloc_sockaddr2dotted(const struct sockaddr *sa)
|
---|
474 | {
|
---|
475 | return sockaddr2str(sa, NI_NUMERICHOST);
|
---|
476 | }
|
---|
477 |
|
---|
478 | char* FAST_FUNC xmalloc_sockaddr2dotted_noport(const struct sockaddr *sa)
|
---|
479 | {
|
---|
480 | return sockaddr2str(sa, NI_NUMERICHOST | IGNORE_PORT);
|
---|
481 | }
|
---|