util.c (1348B)
1 /* See LICENSE file for license details. */ 2 #include <netdb.h> 3 #include <netinet/in.h> 4 #include <sys/socket.h> 5 6 static void 7 eprint(const char *fmt, ...) { 8 va_list ap; 9 10 va_start(ap, fmt); 11 vsnprintf(bufout, sizeof bufout, fmt, ap); 12 va_end(ap); 13 fprintf(stderr, "%s", bufout); 14 if(fmt[0] && fmt[strlen(fmt) - 1] == ':') 15 fprintf(stderr, " %s\n", strerror(errno)); 16 exit(1); 17 } 18 19 static int 20 dial(char *host, char *port) { 21 struct addrinfo hints; 22 struct addrinfo *res, *r; 23 int fd; 24 25 memset(&hints, 0, sizeof hints); 26 hints.ai_family = AF_UNSPEC; 27 hints.ai_socktype = SOCK_STREAM; 28 if(getaddrinfo(host, port, &hints, &res) != 0) 29 eprint("error: cannot resolve hostname '%s':", host); 30 for(r = res; r; r = r->ai_next) { 31 if((fd = socket(r->ai_family, r->ai_socktype, r->ai_protocol)) == -1) 32 continue; 33 if(connect(fd, r->ai_addr, r->ai_addrlen) == 0) 34 break; 35 close(fd); 36 } 37 freeaddrinfo(res); 38 if(!r) 39 eprint("error: cannot connect to host '%s'\n", host); 40 return fd; 41 } 42 43 static char * 44 eat(char *s, int (*p)(int), int r) { 45 while(*s != '\0' && p((unsigned char)*s) == r) 46 s++; 47 return s; 48 } 49 50 static char* 51 skip(char *s, char c) { 52 while(*s != c && *s != '\0') 53 s++; 54 if(*s != '\0') 55 *s++ = '\0'; 56 return s; 57 } 58 59 static void 60 trim(char *s) { 61 char *e; 62 63 for (e = s + strlen(s); e > s && isspace((unsigned char)*(e - 1)); e--) 64 ; 65 *e = '\0'; 66 }