diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/ifupdown.c | 87 |
1 files changed, 50 insertions, 37 deletions
diff --git a/networking/ifupdown.c b/networking/ifupdown.c index 8843184..e9f0a64 100644 --- a/networking/ifupdown.c +++ b/networking/ifupdown.c @@ -104,31 +104,6 @@ static const char *startup_PATH; #if ENABLE_FEATURE_IFUPDOWN_IPV4 || ENABLE_FEATURE_IFUPDOWN_IPV6 -#if ENABLE_FEATURE_IFUPDOWN_IP - -static unsigned count_bits(unsigned a) -{ - unsigned result; - result = (a & 0x55) + ((a >> 1) & 0x55); - result = (result & 0x33) + ((result >> 2) & 0x33); - return (result & 0x0F) + ((result >> 4) & 0x0F); -} - -static int count_netmask_bits(char *dotted_quad) -{ - unsigned result, a, b, c, d; - /* Found a netmask... Check if it is dotted quad */ - if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4) - return -1; - // FIXME: will be confused by e.g. 255.0.255.0 - result = count_bits(a); - result += count_bits(b); - result += count_bits(c); - result += count_bits(d); - return (int)result; -} -#endif - static void addstr(char **bufp, const char *str, size_t str_length) { /* xasprintf trick will be smaller, but we are often @@ -177,6 +152,39 @@ static char *get_var(const char *id, size_t idlen, struct interface_defn_t *ifd) return NULL; } +#if ENABLE_FEATURE_IFUPDOWN_IP +static int count_netmask_bits(const char *dotted_quad) +{ +// int result; +// unsigned a, b, c, d; +// /* Found a netmask... Check if it is dotted quad */ +// if (sscanf(dotted_quad, "%u.%u.%u.%u", &a, &b, &c, &d) != 4) +// return -1; +// if ((a|b|c|d) >> 8) +// return -1; /* one of numbers is >= 256 */ +// d |= (a << 24) | (b << 16) | (c << 8); /* IP */ +// d = ~d; /* 11110000 -> 00001111 */ + + /* Shorter version */ + int result; + struct in_addr ip; + unsigned d; + + if (inet_aton(dotted_quad, &ip) == 0) + return -1; /* malformed dotted IP */ + d = ntohl(ip.s_addr); /* IP in host order */ + d = ~d; /* 11110000 -> 00001111 */ + if (d & (d+1)) /* check that it is in 00001111 form */ + return -1; /* no it is not */ + result = 32; + while (d) { + d >>= 1; + result--; + } + return result; +} +#endif + static char *parse(const char *command, struct interface_defn_t *ifd) { size_t old_pos[MAX_OPT_DEPTH] = { 0 }; @@ -246,11 +254,14 @@ static char *parse(const char *command, struct interface_defn_t *ifd) if (strncmp(command, "bnmask", 6) == 0) { unsigned res; varvalue = get_var("netmask", 7, ifd); - if (varvalue && (res = count_netmask_bits(varvalue)) > 0) { - const char *argument = utoa(res); - addstr(&result, argument, strlen(argument)); - command = nextpercent + 1; - break; + if (varvalue) { + res = count_netmask_bits(varvalue); + if (res > 0) { + const char *argument = utoa(res); + addstr(&result, argument, strlen(argument)); + command = nextpercent + 1; + break; + } } } #endif @@ -463,7 +474,7 @@ static const struct dhcp_client_t ext_dhcp_clients[] = { }, { "udhcpc", "udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]]", - "kill -TERM `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", + "kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", }, }; #endif /* ENABLE_FEATURE_IFUPDOWN_EXTERNAL_DHCPC */ @@ -498,10 +509,10 @@ static int dhcp_down(struct interface_defn_t *ifd, execfn *exec) bb_error_msg("no dhcp clients found, using static interface shutdown"); return static_down(ifd, exec); #elif ENABLE_APP_UDHCPC - return execute("kill -TERM " + return execute("kill " "`cat /var/run/udhcpc.%iface%.pid` 2>/dev/null", ifd, exec); #else - return 0; /* no support for dhcp */ + return 0; /* no dhcp support */ #endif } @@ -834,7 +845,8 @@ static struct interfaces_file_t *read_interfaces(const char *filename) free(buf); } if (ferror(f) != 0) { - bb_perror_msg_and_die("%s", filename); + /* ferror does NOT set errno! */ + bb_error_msg_and_die("%s: I/O error", filename); } fclose(f); @@ -884,9 +896,10 @@ static void set_environ(struct interface_defn_t *iface, const char *mode) for (i = 0; i < iface->n_options; i++) { if (strcmp(iface->option[i].name, "up") == 0 - || strcmp(iface->option[i].name, "down") == 0 - || strcmp(iface->option[i].name, "pre-up") == 0 - || strcmp(iface->option[i].name, "post-down") == 0) { + || strcmp(iface->option[i].name, "down") == 0 + || strcmp(iface->option[i].name, "pre-up") == 0 + || strcmp(iface->option[i].name, "post-down") == 0 + ) { continue; } *(environend++) = setlocalenv("IF_%s=%s", iface->option[i].name, iface->option[i].value); |