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1 | /* | |
2 | * TCP helper functions. | |
3 | * | |
4 | * Copyright (C) 2007 Gerd Hoffmann <kraxel@redhat.com | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License along | |
17 | * with this program; if not, write to the Free Software Foundation, Inc., | |
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | |
19 | */ | |
20 | ||
21 | #include <stdio.h> | |
22 | #include <stdlib.h> | |
23 | #include <errno.h> | |
24 | #include <string.h> | |
25 | #include <unistd.h> | |
26 | #include <fcntl.h> | |
27 | ||
28 | #include "tcp.h" | |
29 | ||
30 | int tcp_verbose; | |
31 | ||
32 | /* ------------------------------------------------------------------ */ | |
33 | ||
34 | static char *strfamily(int family) | |
35 | { | |
36 | switch (family) { | |
37 | case PF_INET6: return "ipv6"; | |
38 | case PF_INET: return "ipv4"; | |
39 | case PF_UNIX: return "unix"; | |
40 | } | |
41 | return "????"; | |
42 | } | |
43 | ||
44 | int tcp_connect(struct addrinfo *ai, | |
45 | char *addr, char *port, | |
46 | char *host, char *serv) | |
47 | { | |
48 | struct addrinfo *res,*e; | |
49 | struct addrinfo *lres, ask; | |
50 | char uaddr[INET6_ADDRSTRLEN+1]; | |
51 | char uport[33]; | |
52 | char uhost[INET6_ADDRSTRLEN+1]; | |
53 | char userv[33]; | |
54 | int sock,rc,opt=1; | |
55 | ||
56 | /* lookup peer */ | |
57 | ai->ai_flags = AI_CANONNAME; | |
58 | if (0 != (rc = getaddrinfo(host, serv, ai, &res))) { | |
59 | if (tcp_verbose) | |
60 | fprintf(stderr,"getaddrinfo (peer): %s\n", gai_strerror(rc)); | |
61 | return -1; | |
62 | } | |
63 | for (e = res; e != NULL; e = e->ai_next) { | |
64 | if (0 != getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen, | |
65 | uhost,INET6_ADDRSTRLEN,userv,32, | |
66 | NI_NUMERICHOST | NI_NUMERICSERV)) { | |
67 | if (tcp_verbose) | |
68 | fprintf(stderr,"getnameinfo (peer): oops\n"); | |
69 | continue; | |
70 | } | |
71 | if (-1 == (sock = socket(e->ai_family, e->ai_socktype, | |
72 | e->ai_protocol))) { | |
73 | if (tcp_verbose) | |
74 | fprintf(stderr,"socket (%s): %s\n", | |
75 | strfamily(e->ai_family),strerror(errno)); | |
76 | continue; | |
77 | } | |
78 | setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt)); | |
79 | if (NULL != addr || NULL != port) { | |
80 | /* bind local port */ | |
81 | memset(&ask,0,sizeof(ask)); | |
82 | ask.ai_flags = AI_PASSIVE; | |
83 | ask.ai_family = e->ai_family; | |
84 | ask.ai_socktype = e->ai_socktype; | |
85 | if (0 != (rc = getaddrinfo(addr, port, &ask, &lres))) { | |
86 | if (tcp_verbose) | |
87 | fprintf(stderr,"getaddrinfo (local): %s\n", | |
88 | gai_strerror(rc)); | |
89 | continue; | |
90 | } | |
91 | if (0 != getnameinfo((struct sockaddr*)lres->ai_addr, | |
92 | lres->ai_addrlen, | |
93 | uaddr,INET6_ADDRSTRLEN,uport,32, | |
94 | NI_NUMERICHOST | NI_NUMERICSERV)) { | |
95 | if (tcp_verbose) | |
96 | fprintf(stderr,"getnameinfo (local): oops\n"); | |
97 | continue; | |
98 | } | |
99 | if (-1 == bind(sock, lres->ai_addr, lres->ai_addrlen)) { | |
100 | if (tcp_verbose) | |
101 | fprintf(stderr,"%s [%s] %s bind: %s\n", | |
102 | strfamily(lres->ai_family),uaddr,uport, | |
103 | strerror(errno)); | |
104 | continue; | |
105 | } | |
106 | } | |
107 | /* connect to peer */ | |
108 | if (-1 == connect(sock,e->ai_addr,e->ai_addrlen)) { | |
109 | if (tcp_verbose) | |
110 | fprintf(stderr,"%s %s [%s] %s connect: %s\n", | |
111 | strfamily(e->ai_family),e->ai_canonname,uhost,userv, | |
112 | strerror(errno)); | |
113 | close(sock); | |
114 | continue; | |
115 | } | |
116 | if (tcp_verbose) | |
117 | fprintf(stderr,"%s %s [%s] %s open\n", | |
118 | strfamily(e->ai_family),e->ai_canonname,uhost,userv); | |
119 | fcntl(sock,F_SETFL,O_NONBLOCK); | |
120 | return sock; | |
121 | } | |
122 | return -1; | |
123 | } | |
124 | ||
125 | int tcp_listen(struct addrinfo *ai, char *addr, char *port) | |
126 | { | |
127 | struct addrinfo *res,*e; | |
128 | char uaddr[INET6_ADDRSTRLEN+1]; | |
129 | char uport[33]; | |
130 | int slisten,rc,opt=1; | |
131 | ||
132 | /* lookup */ | |
133 | ai->ai_flags = AI_PASSIVE; | |
134 | if (0 != (rc = getaddrinfo(addr, port, ai, &res))) { | |
135 | if (tcp_verbose) | |
136 | fprintf(stderr,"getaddrinfo: %s\n",gai_strerror(rc)); | |
137 | exit(1); | |
138 | } | |
139 | ||
140 | /* create socket + bind */ | |
141 | for (e = res; e != NULL; e = e->ai_next) { | |
142 | getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen, | |
143 | uaddr,INET6_ADDRSTRLEN,uport,32, | |
144 | NI_NUMERICHOST | NI_NUMERICSERV); | |
145 | if (-1 == (slisten = socket(e->ai_family, e->ai_socktype, | |
146 | e->ai_protocol))) { | |
147 | if (tcp_verbose) | |
148 | fprintf(stderr,"socket (%s): %s\n", | |
149 | strfamily(e->ai_family),strerror(errno)); | |
150 | continue; | |
151 | } | |
152 | opt = 1; | |
153 | setsockopt(slisten,SOL_SOCKET,SO_REUSEADDR,&opt,sizeof(opt)); | |
154 | if (-1 == bind(slisten, e->ai_addr, e->ai_addrlen)) { | |
155 | if (tcp_verbose) | |
156 | fprintf(stderr,"%s [%s] %s bind: %s\n", | |
157 | strfamily(e->ai_family),uaddr,uport, | |
158 | strerror(errno)); | |
159 | continue; | |
160 | } | |
161 | listen(slisten,1); | |
162 | break; | |
163 | } | |
164 | if (NULL == e) | |
165 | return -1; | |
166 | ||
167 | /* wait for a incoming connection */ | |
168 | if (tcp_verbose) | |
169 | fprintf(stderr,"listen on %s [%s] %s ...\n", | |
170 | strfamily(e->ai_family),uaddr,uport); | |
171 | fcntl(slisten,F_SETFL,O_NONBLOCK); | |
172 | return slisten; | |
173 | } |