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	_p9dialparse.c - 9base - revived minimalist port of Plan 9 userland to Unix
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	_p9dialparse.c (3441B)
	---
	1 #include <u.h>
	2 #define NOPLAN9DEFINES
	3 #include <libc.h>
	4
	5 #include <sys/types.h>
	6 #include <netdb.h>
	7 #include <sys/un.h>
	8 #include <netinet/in.h>
	9
	10 static char *nets[] = { "tcp", "udp", nil };
	11 #define CLASS(p) (((uchar)(p))>>6)
	12
	13 static struct {
	14 char *net;
	15 char *service;
	16 int port;
	17 } porttbl[] = {
	18 "tcp", "9fs", 564,
	19 "tcp", "whoami", 565,
	20 "tcp", "guard", 566,
	21 "tcp", "ticket", 567,
	22 "tcp", "exportfs", 17007,
	23 "tcp", "rexexec", 17009,
	24 "tcp", "ncpu", 17010,
	25 "tcp", "cpu", 17013,
	26 "tcp", "venti", 17034,
	27 "tcp", "wiki", 17035,
	28 "tcp", "secstore", 5356,
	29 "udp", "dns", 53,
	30 "tcp", "dns", 53,
	31 };
	32
	33 static int
	34 parseip(char host, u32int pip)
	35 {
	36 uchar addr[4];
	37 int x, i;
	38 char *p;
	39
	40 p = host;
	41 for(i=0; i<4 && *p; i++){
	42 x = strtoul(p, &p, 0);
	43 if(x < 0 \|\| x >= 256)
	44 return -1;
	45 if(p != '.' && p != 0)
	46 return -1;
	47 if(*p == '.')
	48 p++;
	49 addr[i] = x;
	50 }
	51
	52 switch(CLASS(addr)){
	53 case 0:
	54 case 1:
	55 if(i == 3){
	56 addr[3] = addr[2];
	57 addr[2] = addr[1];
	58 addr[1] = 0;
	59 }else if(i == 2){
	60 addr[3] = addr[1];
	61 addr[2] = 0;
	62 addr[1] = 0;
	63 }else if(i != 4)
	64 return -1;
	65 break;
	66 case 2:
	67 if(i == 3){
	68 addr[3] = addr[2];
	69 addr[2] = 0;
	70 }else if(i != 4)
	71 return -1;
	72 break;
	73 }
	74 memmove(pip, addr, 4);
	75 return 0;
	76 }
	77
	78 int
	79 p9dialparse(char addr, char pnet, char punix, u32int phost, int *p…
	80 {
	81 char net, host, port, e;
	82 int i;
	83 struct servent *se;
	84 struct hostent *he;
	85 struct sockaddr_un *sockun;
	86
	87 *punix = nil;
	88 net = addr;
	89 if((host = strchr(net, '!')) == nil){
	90 werrstr("malformed address");
	91 return -1;
	92 }
	93 *host++ = 0;
	94 if((port = strchr(host, '!')) == nil){
	95 if(strcmp(net, "unix")==0 \|\| strcmp(net, "net")==0){
	96 Unix:
	97 if(strlen(host)+1 > sizeof sockun->sun_path){
	98 werrstr("unix socket name too long");
	99 return -1;
	100 }
	101 *punix = host;
	102 *pnet = "unix";
	103 *phost = 0;
	104 *pport = 0;
	105 return 0;
	106 }
	107 werrstr("malformed address");
	108 return -1;
	109 }
	110 *port++ = 0;
	111
	112 if(*host == 0){
	113 werrstr("malformed address (empty host)");
	114 return -1;
	115 }
	116 if(*port == 0){
	117 werrstr("malformed address (empty port)");
	118 return -1;
	119 }
	120
	121 if(strcmp(net, "unix") == 0)
	122 goto Unix;
	123
	124 if(strcmp(net, "tcp")!=0 && strcmp(net, "udp")!=0 && strcmp(net,…
	125 werrstr("bad network %s!%s!%s", net, host, port);
	126 return -1;
	127 }
	128
	129 /* translate host */
	130 if(strcmp(host, "*") == 0)
	131 *phost = 0;
	132 else if(parseip(host, phost) == 0)
	133 {}
	134 else if((he = gethostbyname(host)) != nil)
	135 phost = (u32int*)(he->h_addr);
	136 else{
	137 werrstr("unknown host %s", host);
	138 return -1;
	139 }
	140
	141 /* translate network and port; should return list rather than fi…
	142 if(strcmp(net, "net") == 0){
	143 for(i=0; nets[i]; i++){
	144 if((se = getservbyname(port, nets[i])) != nil){
	145 *pnet = nets[i];
	146 *pport = ntohs(se->s_port);
	147 return 0;
	148 }
	149 }
	150 }
	151
	152 for(i=0; i<nelem(porttbl); i++){
	153 if(strcmp(net, "net") == 0 \|\| strcmp(porttbl[i].net, net…
	154 if(strcmp(porttbl[i].service, port) == 0){
	155 *pnet = porttbl[i].net;
	156 *pport = porttbl[i].port;
	157 return 0;
	158 }
	159 }
	160
	161 if(strcmp(net, "net") == 0){
	162 werrstr("unknown service net!*!%s", port);
	163 return -1;
	164 }
	165
	166 if(strcmp(net, "tcp") != 0 && strcmp(net, "udp") != 0){
	167 werrstr("unknown network %s", net);
	168 return -1;
	169 }
	170
	171 *pnet = net;
	172 i = strtol(port, &e, 0);
	173 if(*e == 0){
	174 *pport = i;
	175 return 0;
	176 }
	177
	178 if((se = getservbyname(port, net)) != nil){
	179 *pport = ntohs(se->s_port);
	180 return 0;
	181 }
	182 werrstr("unknown service %s!*!%s", net, port);
	183 return -1;
	184 }