[0] | 1 | //socket.c: |
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| 2 | |
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| 3 | #include "libroar.h" |
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| 4 | |
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[81] | 5 | /* old... |
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[0] | 6 | #define MODE_LISTEN 1 |
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| 7 | #define MODE_CONNECT 2 |
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[81] | 8 | */ |
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| 9 | #define MODE_LISTEN ROAR_SOCKET_MODE_LISTEN |
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| 10 | #define MODE_CONNECT ROAR_SOCKET_MODE_CONNECT |
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[0] | 11 | |
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| 12 | int roar_socket_new_tcp (void) { |
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| 13 | int fh; |
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[234] | 14 | int opt = IPTOS_LOWDELAY; |
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[0] | 15 | // int extra_flags = TCP_NODELAY; |
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| 16 | |
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| 17 | fh = socket(PF_INET, SOCK_STREAM, 0); |
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| 18 | |
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[234] | 19 | /* |
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| 20 | phi@ph7:libroar $ IP_TOS |
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| 21 | phi@ph7:libroar $ IPTOS_LOWDELAY |
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| 22 | */ |
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| 23 | |
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| 24 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
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| 25 | |
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[0] | 26 | return fh; |
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| 27 | } |
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| 28 | |
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[374] | 29 | int roar_socket_new_udp (void) { |
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| 30 | int fh; |
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| 31 | int opt = IPTOS_LOWDELAY; |
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| 32 | |
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| 33 | fh = socket(PF_INET, SOCK_DGRAM, 0); |
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| 34 | |
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| 35 | setsockopt(fh, IPPROTO_IP, IP_TOS, &opt, sizeof(int)); |
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| 36 | |
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| 37 | return fh; |
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| 38 | } |
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| 39 | |
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[0] | 40 | int roar_socket_new_unix (void) { |
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| 41 | int fh; |
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| 42 | |
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| 43 | fh = socket(AF_UNIX, SOCK_STREAM, 0); |
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| 44 | |
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| 45 | return fh; |
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| 46 | } |
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| 47 | |
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| 48 | int roar_socket_nonblock(int fh, int state) { |
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| 49 | int flags; |
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| 50 | |
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| 51 | if ( (flags = fcntl(fh, F_GETFL, 0)) == -1 ) { |
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| 52 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not read flags: %s", fh, state, strerror(errno)); |
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| 53 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
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| 54 | return -1; |
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| 55 | } |
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| 56 | |
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| 57 | flags |= O_NONBLOCK; |
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| 58 | |
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| 59 | if ( state == ROAR_SOCKET_BLOCK ) |
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| 60 | flags -= O_NONBLOCK; |
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| 61 | |
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| 62 | if ( fcntl(fh, F_SETFL, flags) == -1 ) { |
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| 63 | ROAR_ERR("roar_socket_nonblock(fh=%i, state=%i): Can not set flags: %s", fh, state, strerror(errno)); |
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| 64 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = -1", fh, state); |
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| 65 | return -1; |
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| 66 | } |
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| 67 | |
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| 68 | ROAR_DBG("roar_socket_nonblock(fh=%i, state=%i) = 0", fh, state); |
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| 69 | return 0; |
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| 70 | } |
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| 71 | |
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| 72 | int roar_socket_listen (int type, char * host, int port) { |
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| 73 | return roar_socket_open(MODE_LISTEN, type, host, port); |
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| 74 | } |
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| 75 | |
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| 76 | int roar_socket_connect (char * host, int port) { |
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[2] | 77 | char * proxy_type = getenv("ROAR_PROXY"); |
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| 78 | |
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| 79 | if ( proxy_type == NULL || strcmp(proxy_type, "") == 0 ) { |
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| 80 | return roar_socket_open(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port); |
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| 81 | } else { |
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| 82 | return roar_socket_open_proxy(MODE_CONNECT, ROAR_SOCKET_TYPE_UNKNOWN, host, port, proxy_type); |
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| 83 | } |
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[0] | 84 | } |
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| 85 | |
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| 86 | int roar_socket_open (int mode, int type, char * host, int port) { |
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| 87 | // int type = ROAR_SOCKET_TYPE_INET; |
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| 88 | int fh; |
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| 89 | struct sockaddr_in socket_addr; |
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[60] | 90 | struct sockaddr_un socket_addr_un; |
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[0] | 91 | struct hostent * he; |
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| 92 | //unsigned int host_div = 0; |
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| 93 | int (*mode_func)(int sockfd, const struct sockaddr *serv_addr, socklen_t addrlen) = connect; // default is to connect |
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| 94 | |
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| 95 | if ( mode == MODE_LISTEN ) |
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| 96 | mode_func = bind; |
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| 97 | |
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| 98 | if ( type == ROAR_SOCKET_TYPE_UNKNOWN ) { |
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| 99 | type = ROAR_SOCKET_TYPE_INET; |
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[69] | 100 | if ( *host == '/' ) { |
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[0] | 101 | type = ROAR_SOCKET_TYPE_UNIX; |
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[69] | 102 | } else if ( strcmp(host, "+fork") == 0 ) { |
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| 103 | type = ROAR_SOCKET_TYPE_FORK; |
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| 104 | } |
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[0] | 105 | } |
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| 106 | |
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| 107 | |
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| 108 | ROAR_DBG("roar_socket_open(*): type=%s, host='%s', port=%i", |
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| 109 | type == ROAR_SOCKET_TYPE_UNIX ? "UNIX" : "INET", host, port); |
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| 110 | |
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[60] | 111 | memset(&socket_addr , 0, sizeof(socket_addr)); |
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| 112 | memset(&socket_addr_un, 0, sizeof(socket_addr_un)); |
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| 113 | memset(&he, 0, sizeof(he)); // FIXME: we have a valid pointer in here???? |
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[0] | 114 | |
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| 115 | |
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| 116 | if ( type == ROAR_SOCKET_TYPE_INET ) { |
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| 117 | |
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| 118 | if ( (he = gethostbyname(host)) == NULL ) { |
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| 119 | ROAR_ERR("roar_socket_open(*): Can\'t resolve host name '%s'", |
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| 120 | host); |
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| 121 | return -1; |
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| 122 | } |
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| 123 | |
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| 124 | memcpy((struct in_addr *)&socket_addr.sin_addr, he->h_addr, sizeof(struct in_addr)); |
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| 125 | |
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| 126 | /* set the connect information */ |
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| 127 | socket_addr.sin_family = AF_INET; |
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| 128 | socket_addr.sin_port = htons( port ); |
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| 129 | |
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| 130 | fh = roar_socket_new_tcp(); |
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| 131 | |
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| 132 | if ( mode_func(fh, (struct sockaddr *)&socket_addr, sizeof(struct sockaddr_in)) == -1 ) { |
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| 133 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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| 134 | close(fh); |
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| 135 | return -1; |
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| 136 | } |
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| 137 | // hey! we have a socket... |
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[69] | 138 | } else if ( type == ROAR_SOCKET_TYPE_UNIX ) { |
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[60] | 139 | socket_addr_un.sun_family = AF_UNIX; |
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| 140 | strncpy(socket_addr_un.sun_path, host, sizeof(socket_addr_un.sun_path) - 1); |
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| 141 | |
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[0] | 142 | fh = roar_socket_new_unix(); |
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[60] | 143 | |
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| 144 | if ( mode_func(fh, (struct sockaddr *)&socket_addr_un, sizeof(struct sockaddr_un)) == -1 ) { |
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| 145 | ROAR_DBG("roar_socket_open(*): Can not connect/bind: %s", strerror(errno)); |
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| 146 | close(fh); |
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| 147 | return -1; |
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| 148 | } |
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[69] | 149 | } else if ( type == ROAR_SOCKET_TYPE_FORK ) { |
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| 150 | return roar_socket_open_fork(mode, host, port); |
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[75] | 151 | } else if ( type == ROAR_SOCKET_TYPE_FILE ) { |
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| 152 | return roar_socket_open_file(mode, host, port); |
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[69] | 153 | } else { |
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| 154 | return -1; |
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[0] | 155 | } |
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| 156 | |
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| 157 | if ( mode == MODE_LISTEN ) |
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| 158 | if ( listen(fh, ROAR_SOCKET_QUEUE_LEN) == -1 ) { |
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| 159 | close(fh); |
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| 160 | return -1; |
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| 161 | } |
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| 162 | |
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| 163 | return fh; |
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| 164 | } |
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| 165 | |
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[69] | 166 | int roar_socket_open_fork (int mode, char * host, int port) { |
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| 167 | int socks[2]; |
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| 168 | int r; |
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| 169 | char fhstr[8]; |
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| 170 | |
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| 171 | if ( mode == MODE_LISTEN ) |
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| 172 | return -1; |
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| 173 | |
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| 174 | if ( socketpair(AF_UNIX, SOCK_STREAM, 0, socks) == -1 ) { |
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| 175 | return -1; |
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| 176 | } |
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| 177 | |
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| 178 | r = fork(); |
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| 179 | |
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| 180 | if ( r == -1 ) { // error! |
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| 181 | ROAR_ERR("roar_socket_open_fork(*): Can not fork: %s", strerror(errno)); |
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| 182 | close(socks[0]); |
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| 183 | close(socks[1]); |
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| 184 | return -1; |
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| 185 | } else if ( r == 0 ) { // we are the child |
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| 186 | close(socks[0]); |
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| 187 | |
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[70] | 188 | close(ROAR_STDIN ); // we do not want roard to have any standard input |
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| 189 | close(ROAR_STDOUT); // STDOUT is also not needed, so we close it, |
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| 190 | // but STDERR we keep open for error messages. |
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| 191 | |
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[69] | 192 | snprintf(fhstr, 7, "%i", socks[1]); |
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| 193 | |
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[71] | 194 | execlp("roard", "roard", "--terminate", "--no-listen", "--client-fh", fhstr, NULL); |
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[69] | 195 | |
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| 196 | // we are still alive? |
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| 197 | ROAR_ERR("roar_socket_open_fork(*): alive after exec(), that's bad!"); |
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| 198 | _exit(1); |
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| 199 | } else { // we are the parent |
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| 200 | close(socks[1]); |
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| 201 | return socks[0]; |
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| 202 | } |
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| 203 | |
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| 204 | return -1; |
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| 205 | } |
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| 206 | |
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[75] | 207 | int roar_socket_open_file (int mode, char * host, int port) { |
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| 208 | int fh; |
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| 209 | |
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| 210 | if ( mode == MODE_LISTEN ) |
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| 211 | return -1; |
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| 212 | |
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| 213 | if ( (fh = open(host, O_RDONLY, 0644)) == -1 ) { |
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| 214 | ROAR_ERR("roar_socket_open_file(*): Can not open file %s: %s", host, strerror(errno)); |
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| 215 | } |
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| 216 | |
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| 217 | return fh; |
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| 218 | } |
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| 219 | |
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[2] | 220 | // --- [ PROXY CODE ] --- |
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| 221 | |
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| 222 | // generic proxy code: |
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| 223 | |
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| 224 | int roar_socket_open_proxy (int mode, int type, char * host, int port, char * proxy_type) { |
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| 225 | int proxy_port; |
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| 226 | char proxy_host[ROAR_SOCKET_MAX_HOSTNAMELEN]; |
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| 227 | char * proxy_addr; |
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| 228 | int i; |
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| 229 | int fh; |
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| 230 | |
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| 231 | // TODO: change this so we support listen() proxys (ssh -R) |
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| 232 | if ( mode != MODE_CONNECT ) |
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| 233 | return -1; |
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| 234 | |
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| 235 | if ( !strcmp(proxy_type, "socks4a") ) { // for TOR, the only supported type at the moment |
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| 236 | proxy_addr = getenv("socks_proxy"); |
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| 237 | |
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| 238 | proxy_port = 9050; // TOR's default port |
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| 239 | |
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| 240 | if ( proxy_addr == NULL ) |
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| 241 | return -1; |
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| 242 | |
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| 243 | for (i = 0; proxy_addr[i] != 0 && proxy_addr[i] != ':' && i < ROAR_SOCKET_MAX_HOSTNAMELEN; i++) |
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| 244 | proxy_host[i] = proxy_addr[i]; |
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| 245 | proxy_host[i] = 0; |
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| 246 | |
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| 247 | if ( i == 0 ) // no hostname found |
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| 248 | return -1; |
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| 249 | |
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| 250 | if ( proxy_addr[i] == ':' ) |
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| 251 | proxy_port = atoi(&proxy_addr[i+1]); |
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| 252 | |
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| 253 | if ( (fh = roar_socket_open(mode, type, proxy_host, proxy_port)) == -1) { |
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| 254 | return -1; |
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| 255 | } |
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| 256 | |
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| 257 | if ( roar_socket_open_socks4a(mode, fh, host, port) == -1 ) { |
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| 258 | close(fh); |
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| 259 | return -1; |
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| 260 | } |
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| 261 | |
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| 262 | return fh; |
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| 263 | } else { |
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| 264 | return -1; // unknown type |
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| 265 | } |
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| 266 | } |
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| 267 | |
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| 268 | // protocoll dependet proxy code: |
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| 269 | |
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| 270 | int roar_socket_open_socks4a(int mode, int fh, char * host, int port) { |
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| 271 | char buf[9]; |
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| 272 | int len; |
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| 273 | |
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| 274 | buf[0] = 0x04; |
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| 275 | buf[1] = mode == MODE_CONNECT ? 0x01 : 0x02; |
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| 276 | *((uint16_t*)&buf[2]) = htons(port); |
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| 277 | buf[4] = 0x00; |
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| 278 | buf[5] = 0x00; |
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| 279 | buf[6] = 0x00; |
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| 280 | buf[7] = 0x01; |
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| 281 | buf[8] = 0x00; |
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| 282 | |
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| 283 | if ( write(fh, buf, 9) != 9 ) |
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| 284 | return -1; |
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| 285 | |
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| 286 | len = strlen(host); |
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| 287 | |
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| 288 | if ( write(fh, host, len) != len ) |
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| 289 | return -1; |
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| 290 | |
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| 291 | if ( write(fh, "\0", 1) != 1 ) |
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| 292 | return -1; |
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| 293 | |
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| 294 | if ( read(fh, buf, 8) != 8 ) |
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| 295 | return -1; |
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| 296 | |
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| 297 | if ( buf[1] != 0x5a ) |
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| 298 | return -1; |
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| 299 | |
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| 300 | return 0; |
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| 301 | } |
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| 302 | |
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[0] | 303 | //ll |
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