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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,86 @@ | ||
| #include <time.h> | ||
| #include <string.h> | ||
| #include <arpa/inet.h> | ||
| #include <unistd.h> | ||
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| #include "dhcp.h" | ||
| #include "common.h" | ||
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| /* | ||
| * TODO 这里没有实现dhcp协议，只是把接口留在这里了。 | ||
| * 使用了一种替代方案来使程序工作 | ||
| */ | ||
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| /* TODO 暂时为我们学校固定 */ | ||
| #define SERIP "10.255.0.195" | ||
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| /* | ||
| * 为s设置接口名字 | ||
| * 使用s进行dhcp获取ip时，**必须**先指明接口 | ||
| * @return: 0: 成功 | ||
| * -1: 失败 | ||
| */ | ||
| int dhcp_setif(dhcp_t *s, char const *ifname) | ||
| { | ||
| strncpy(s->ifname, ifname, IFNAMSIZ); | ||
| _D("ifname: %s\n", s->ifname); | ||
| return 0; | ||
| } | ||
| /* | ||
| * 从s里获取dhcp服务器ip信息 | ||
| * s: dhcp_t结构体 | ||
| * type: AF_INET: ipv4; AF_INET6: ipv6 | ||
| * serip: 如果是AF_INET，这是一个struct in_addr指针 | ||
| * 如果是AF_INET6, 这是一个struct in6_addr指针 | ||
| * @return: 0: 成功 | ||
| * -1: s没有需要获取的信息 | ||
| */ | ||
| int dhcp_getsip(dhcp_t *s, int type, void *serip) | ||
| { | ||
| memcpy(serip, &s->_data._v4._serip, sizeof(struct in_addr)); | ||
| return 0; | ||
| } | ||
| /* 获取到的ip, 和上述类似 */ | ||
| int dhcp_getcip(dhcp_t *s, int type, void *clip) | ||
| { | ||
| memcpy(clip, &s->_data._v4._clip, sizeof(struct in_addr)); | ||
| return 0; | ||
| } | ||
| /* 获取获取到ip的subnet mask, 和上述类似 */ | ||
| int dhcp_getmask(dhcp_t *s, int type, void *mask) | ||
| { | ||
| memcpy(mask, &s->_data._v4._mask, sizeof(struct in_addr)); | ||
| return 0; | ||
| } | ||
| /* | ||
| * 执行dhcp协议获取可用ip和mask信息 | ||
| * tip需要给出接口信息 | ||
| * 结果存储在tip里 | ||
| * @return: 0: 成功 | ||
| * 1: 没有这个接口 | ||
| * 2: 网络并不通，没有服务器响应 | ||
| * -1: 超时 | ||
| */ | ||
| int dhcp_run(dhcp_t *tip) | ||
| { | ||
| struct in_addr ip; | ||
| inet_pton(AF_INET, SERIP, &ip); | ||
| memcpy(&tip->_data._v4._serip, &ip, sizeof(ip)); | ||
| struct timespec stime, etime; | ||
| /* | ||
| * 每3秒检测网络是否通 | ||
| * 直到一个超过DHCP_TIMEOUT时间 | ||
| */ | ||
| clock_gettime(CLOCK_MONOTONIC, &stime); | ||
| clock_gettime(CLOCK_MONOTONIC, &etime); | ||
| while (!isnetok(tip->ifname) && difftimespec(etime, stime) <= 1000*DHCP_TIMEOUT) { | ||
| sleep(3); | ||
| clock_gettime(CLOCK_MONOTONIC, &etime); | ||
| } | ||
| if (difftimespec(etime, stime) > 1000*DHCP_TIMEOUT) { | ||
| return -1; | ||
| } | ||
|
|
||
| return 0; | ||
| } | ||
|
|
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,65 @@ | ||
| #ifndef _DHCP_H | ||
| #define _DHCP_H | ||
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| #include <arpa/inet.h> | ||
| #include <net/if.h> | ||
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| /* | ||
| * dhcp请求超时 | ||
| * 单位秒s | ||
| */ | ||
| #define DHCP_TIMEOUT (120) | ||
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| /* | ||
| * 信息存储结构 | ||
| */ | ||
| typedef struct dhcp_t { | ||
| char ifname[IFNAMSIZ]; | ||
| union { | ||
| struct { /* ipv4 */ | ||
| struct in_addr _serip; | ||
| struct in_addr _clip; | ||
| struct in_addr _mask; | ||
| }_v4; | ||
| struct { /* ipv6 */ | ||
| struct in6_addr _serip; | ||
| struct in6_addr _clip; | ||
| struct in6_addr _mask; | ||
| }_v6; | ||
| }_data; | ||
| }dhcp_t; | ||
|
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||
| /* | ||
| * 为s设置接口名字 | ||
| * NOTE 使用s进行dhcp获取ip时，**必须**先指明接口 | ||
| * @return: 0: 成功 | ||
| * -1: 失败 | ||
| */ | ||
| int dhcp_setif(dhcp_t *s, char const *ifname); | ||
| /* | ||
| * 从s里获取dhcp服务器ip信息 | ||
| * s: dhcp_t结构体 | ||
| * type: AF_INET: ipv4; AF_INET6: ipv6 | ||
| * serip: 如果是AF_INET，这是一个struct in_addr指针 | ||
| * 如果是AF_INET6, 这是一个struct in6_addr指针 | ||
| * @return: 0: 成功 | ||
| * -1: s没有需要获取的信息 | ||
| */ | ||
| int dhcp_getsip(dhcp_t *s, int type, void *serip); | ||
| /* 获取到的ip, 和上述类似 */ | ||
| int dhcp_getcip(dhcp_t *s, int type, void *clip); | ||
| /* 获取获取到ip的subnet mask, 和上述类似 */ | ||
| int dhcp_getmask(dhcp_t *s, int type, void *mask); | ||
|
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||
| /* | ||
| * 执行dhcp协议获取可用ip和mask信息 | ||
| * tip需要给出接口信息 | ||
| * 结果存储在tip里 | ||
| * @return: 0: 成功 | ||
| * 1: 没有这个接口 | ||
| * 2: 网络并不通，没有服务器响应 | ||
| * -1: 超时 | ||
| */ | ||
| int dhcp_run(dhcp_t *tip); | ||
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||
| #endif |
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