1 /* 2 * src/utils.c Utilities 3 * 4 * This library is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU Lesser General Public 6 * License as published by the Free Software Foundation version 2.1 7 * of the License. 8 * 9 * Copyright (c) 2003-2009 Thomas Graf <tgraf (at) suug.ch> 10 */ 11 12 /** 13 * @defgroup cli Command Line Interface API 14 * 15 * @{ 16 * 17 * These modules provide an interface for text based applications. The 18 * functions provided are wrappers for their libnl equivalent with 19 * added error handling. The functions check for allocation failures, 20 * invalid input, and unknown types and will print error messages 21 * accordingly via nl_cli_fatal(). 22 */ 23 24 #include <netlink/cli/utils.h> 25 26 /** 27 * Parse a text based 32 bit unsigned integer argument 28 * @arg arg Integer in text form. 29 * 30 * Tries to convert the number provided in arg to a uint32_t. Will call 31 * nl_cli_fatal() if the conversion fails. 32 * 33 * @return 32bit unsigned integer. 34 */ 35 uint32_t nl_cli_parse_u32(const char *arg) 36 { 37 unsigned long lval; 38 char *endptr; 39 40 lval = strtoul(arg, &endptr, 0); 41 if (endptr == arg || lval == ULONG_MAX) 42 nl_cli_fatal(EINVAL, "Unable to parse \"%s\", not a number.", 43 arg); 44 45 return (uint32_t) lval; 46 } 47 48 void nl_cli_print_version(void) 49 { 50 printf("libnl tools version %s\n", LIBNL_VERSION); 51 printf( 52 "Copyright (C) 2003-2010 Thomas Graf <tgraf (at) redhat.com>\n" 53 "\n" 54 "This program comes with ABSOLUTELY NO WARRANTY. This is free \n" 55 "software, and you are welcome to redistribute it under certain\n" 56 "conditions. See the GNU General Public License for details.\n" 57 ); 58 59 exit(0); 60 } 61 62 /** 63 * Print error message and quit application 64 * @arg err Error code. 65 * @arg fmt Error message. 66 * 67 * Prints the formatted error message to stderr and quits the application 68 * using the provided error code. 69 */ 70 void nl_cli_fatal(int err, const char *fmt, ...) 71 { 72 va_list ap; 73 char buf[256]; 74 75 fprintf(stderr, "Error: "); 76 77 if (fmt) { 78 va_start(ap, fmt); 79 vfprintf(stderr, fmt, ap); 80 va_end(ap); 81 fprintf(stderr, "\n"); 82 } else 83 fprintf(stderr, "%s\n", strerror_r(err, buf, sizeof(buf))); 84 85 exit(abs(err)); 86 } 87 88 int nl_cli_connect(struct nl_sock *sk, int protocol) 89 { 90 int err; 91 92 if ((err = nl_connect(sk, protocol)) < 0) 93 nl_cli_fatal(err, "Unable to connect netlink socket: %s", 94 nl_geterror(err)); 95 96 return err; 97 } 98 99 struct nl_sock *nl_cli_alloc_socket(void) 100 { 101 struct nl_sock *sock; 102 103 if (!(sock = nl_socket_alloc())) 104 nl_cli_fatal(ENOBUFS, "Unable to allocate netlink socket"); 105 106 return sock; 107 } 108 109 struct nl_addr *nl_cli_addr_parse(const char *str, int family) 110 { 111 struct nl_addr *addr; 112 int err; 113 114 if ((err = nl_addr_parse(str, family, &addr)) < 0) 115 nl_cli_fatal(err, "Unable to parse address \"%s\": %s", 116 str, nl_geterror(err)); 117 118 return addr; 119 } 120 121 int nl_cli_parse_dumptype(const char *str) 122 { 123 if (!strcasecmp(str, "brief")) 124 return NL_DUMP_LINE; 125 else if (!strcasecmp(str, "details") || !strcasecmp(str, "detailed")) 126 return NL_DUMP_DETAILS; 127 else if (!strcasecmp(str, "stats")) 128 return NL_DUMP_STATS; 129 else 130 nl_cli_fatal(EINVAL, "Invalid dump type \"%s\".\n", str); 131 132 return 0; 133 } 134 135 int nl_cli_confirm(struct nl_object *obj, struct nl_dump_params *params, 136 int default_yes) 137 { 138 nl_object_dump(obj, params); 139 140 for (;;) { 141 char buf[32] = { 0 }; 142 int answer; 143 144 printf("Delete? (%c/%c) ", 145 default_yes ? 'Y' : 'y', 146 default_yes ? 'n' : 'N'); 147 148 if (!fgets(buf, sizeof(buf), stdin)) { 149 fprintf(stderr, "Error while reading\n."); 150 continue; 151 } 152 153 switch ((answer = tolower(buf[0]))) { 154 case '\n': 155 answer = default_yes ? 'y' : 'n'; 156 case 'y': 157 case 'n': 158 return answer == 'y'; 159 } 160 161 fprintf(stderr, "Invalid input, try again.\n"); 162 } 163 164 return 0; 165 166 } 167 168 struct nl_cache *nl_cli_alloc_cache(struct nl_sock *sock, const char *name, 169 int (*ac)(struct nl_sock *, struct nl_cache **)) 170 { 171 struct nl_cache *cache; 172 int err; 173 174 if ((err = ac(sock, &cache)) < 0) 175 nl_cli_fatal(err, "Unable to allocate %s cache: %s", 176 name, nl_geterror(err)); 177 178 nl_cache_mngt_provide(cache); 179 180 return cache; 181 } 182 183 void nl_cli_load_module(const char *prefix, const char *name) 184 { 185 char path[FILENAME_MAX+1]; 186 void *handle; 187 188 snprintf(path, sizeof(path), "%s/%s/%s.so", 189 PKGLIBDIR, prefix, name); 190 191 if (!(handle = dlopen(path, RTLD_NOW))) 192 nl_cli_fatal(ENOENT, "Unable to load module \"%s\": %s\n", 193 path, dlerror()); 194 } 195 196 /** @} */ 197
