More accurate and trustworthy descriptions of the netmask exist.
Interested readers can quench their curiosity either with one of the Richard Stevens books (ISBN 9780201633467) or the Wikipedia page (http://en.wikipedia.org/wiki/Subnetwork). This commit was SVN r24680.
Этот коммит содержится в:
George Bosilca
родитель
fb3fd8fd0e
Коммит
34abbce82c
122
opal/util/if.c
122
opal/util/if.c
@ -488,7 +488,7 @@ opal_ifislocal(const char *hostname)
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return false;
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}
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static uint32_t parse_dots(char *addr)
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static uint32_t parse_dots(const char *addr)
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{
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char **tuple;
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uint32_t n[]={0,0,0,0};
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@ -506,9 +506,8 @@ static uint32_t parse_dots(char *addr)
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}
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int
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opal_iftupletoaddr(char *inaddr, uint32_t *net, uint32_t *mask)
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opal_iftupletoaddr(const char *inaddr, uint32_t *net, uint32_t *mask)
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{
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char *addr;
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char **tuple;
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int pval;
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char *msk, *ptr;
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@ -517,12 +516,10 @@ opal_iftupletoaddr(char *inaddr, uint32_t *net, uint32_t *mask)
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if (NULL != mask) {
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/* set default */
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*mask = 0xFFFFFFFF;
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/* protect the input */
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addr = strdup(inaddr);
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/* if entry includes mask, split that off */
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msk = NULL;
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if (NULL != (ptr = strchr(addr, '/'))) {
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if (NULL != (ptr = strchr(inaddr, '/'))) {
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*ptr = '\0';
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msk = ptr + 1;
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/* is the mask a tuple? */
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@ -530,113 +527,19 @@ opal_iftupletoaddr(char *inaddr, uint32_t *net, uint32_t *mask)
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/* yes - extract mask from it */
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*mask = parse_dots(msk);
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} else {
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/* no - must be an int telling us how
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* much of the addr to use: e.g., /16
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/* no - must be an int telling us how much of the addr to use: e.g., /16
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* For more information please read http://en.wikipedia.org/wiki/Subnetwork.
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*/
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pval = strtol(msk, NULL, 10);
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switch(pval) {
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case 30:
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*mask = parse_dots("255.255.255.252");
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break;
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case 29:
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*mask = parse_dots("255.255.255.248");
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break;
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case 28:
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*mask = parse_dots("255.255.255.240");
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break;
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case 27:
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*mask = parse_dots("255.255.255.224");
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break;
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case 26:
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*mask = parse_dots("255.255.255.192");
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break;
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case 25:
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*mask = parse_dots("255.255.255.128");
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break;
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case 24:
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*mask = parse_dots("255.255.255.0");
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break;
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case 23:
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*mask = parse_dots("255.255.254.0");
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break;
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case 22:
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*mask = parse_dots("255.255.252.0");
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break;
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case 21:
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*mask = parse_dots("255.255.248.0");
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break;
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case 20:
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*mask = parse_dots("255.255.240.0");
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break;
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case 19:
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*mask = parse_dots("255.255.224.0");
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break;
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case 18:
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*mask = parse_dots("255.255.192.0");
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break;
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case 17:
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*mask = parse_dots("255.255.128.0");
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break;
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case 16:
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*mask = parse_dots("255.255.0.0");
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break;
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case 15:
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*mask = parse_dots("255.254.0.0");
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break;
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case 14:
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*mask = parse_dots("255.252.0.0");
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break;
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case 13:
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*mask = parse_dots("255.248.0.0");
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break;
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case 12:
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*mask = parse_dots("255.240.0.0");
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break;
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case 11:
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*mask = parse_dots("255.224.0.0");
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break;
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case 10:
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*mask = parse_dots("255.192.0.0");
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break;
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case 9:
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*mask = parse_dots("255.128.0.0");
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break;
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case 8:
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*mask = parse_dots("255.0.0.0");
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break;
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case 7:
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*mask = parse_dots("254.0.0.0");
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break;
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case 6:
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*mask = parse_dots("252.0.0.0");
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break;
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case 5:
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*mask = parse_dots("248.0.0.0");
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break;
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case 4:
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*mask = parse_dots("240.0.0.0");
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break;
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case 3:
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*mask = parse_dots("224.0.0.0");
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break;
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case 2:
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*mask = parse_dots("192.0.0.0");
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break;
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case 1:
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*mask = parse_dots("128.0.0.0");
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break;
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case 0:
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*mask = parse_dots("0.0.0.0");
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break;
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default:
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if ((pval > 31) || (pval < 1)) {
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opal_output(0, "opal_iftupletoaddr: unknown mask");
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free(addr);
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return OPAL_ERROR;
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}
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*mask = 0xFFFFFFFF << (32 - pval);
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}
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} else {
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/* use the number of dots to determine it */
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tuple = opal_argv_split(addr, '.');
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tuple = opal_argv_split(inaddr, '.');
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pval = opal_argv_count(tuple);
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/* if we have three dots, then we have four
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* fields since it is a full address, so the
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@ -651,29 +554,24 @@ opal_iftupletoaddr(char *inaddr, uint32_t *net, uint32_t *mask)
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*mask = 0xFF000000;
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} else {
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opal_output(0, "opal_iftupletoaddr: unknown mask");
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free(addr);
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return OPAL_ERROR;
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}
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}
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opal_argv_free(tuple);
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}
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free(addr);
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}
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/* if network addr is desired... */
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if (NULL != net) {
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/* set default */
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*net = 0;
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/* protect the input */
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addr = strdup(inaddr);
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/* if entry includes mask, split that off */
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if (NULL != (ptr = strchr(addr, '/'))) {
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if (NULL != (ptr = strchr(inaddr, '/'))) {
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*ptr = '\0';
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}
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/* now assemble the address */
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*net = parse_dots(addr);
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free(addr);
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*net = parse_dots(inaddr);
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}
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return OPAL_SUCCESS;
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@ -179,7 +179,7 @@ OPAL_DECLSPEC bool opal_ifislocal(const char *hostname);
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* @return OPAL_SUCCESS if no problems encountered
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* @return OPAL_ERROR if data could not be released
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*/
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OPAL_DECLSPEC int opal_iftupletoaddr(char *addr, uint32_t *net, uint32_t *mask);
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OPAL_DECLSPEC int opal_iftupletoaddr(const char *addr, uint32_t *net, uint32_t *mask);
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/**
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* Determine if given interface is loopback
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