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Lines 203-230
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static char *get_name(char *name, char *p) |
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static char *get_name(char *name, char *p) |
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{ |
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{ |
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int nameidx=0; |
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while (isspace(*p)) |
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while (isspace(*p)) |
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p++; |
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p++; |
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while (*p) { |
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/* Guard main loop - shouldn't ever be a problem, unless the kernel |
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puts invalid data in the network device listing. IFNAMSIZ-1 is |
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necessary as a terminator is written at the end of the loop */ |
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while (*p && (nameidx<(IFNAMSIZ-1))) { |
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if (isspace(*p)) |
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if (isspace(*p)) |
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break; |
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break; |
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if (*p == ':') { /* could be an alias */ |
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if (*p == ':') { /* could be an alias */ |
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char *dot = p, *dotname = name; |
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char *dot = p; |
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*name++ = *p++; |
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int dotnameidx = nameidx; |
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while (isdigit(*p)) |
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name[nameidx++] = *p++; |
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*name++ = *p++; |
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/* Guard alias scanning - when bytes field is large |
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enough it attaches to the : of the interface name, |
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and this scan therefore tries to parse it - without the |
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guard it is possible to overrun the name[] buffer. Limit |
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is IFNAMSIZ-2 to allow space for the ':' written after |
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this "while", and the terminator written after the |
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enclosing "if". */ |
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while (isdigit(*p) && (nameidx<(IFNAMSIZ-2))) |
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name[nameidx++] = *p++; |
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if (*p != ':') { /* it wasn't, backup */ |
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if (*p != ':') { /* it wasn't, backup */ |
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p = dot; |
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p = dot; |
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name = dotname; |
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nameidx = dotnameidx; |
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} |
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} |
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if (*p == '\0') |
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if (*p == '\0') |
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return NULL; |
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return NULL; |
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p++; |
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p++; |
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break; |
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break; |
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} |
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} |
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*name++ = *p++; |
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name[nameidx++] = *p++; |
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} |
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} |
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*name++ = '\0'; |
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name[nameidx] = '\0'; |
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return p; |
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return p; |
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} |
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} |
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